Struct QGridLayout

#[repr(C)]
pub struct QGridLayout { /* private fields */ }

The QGridLayout class lays out widgets in a grid.

C++ class: QGridLayout.

C++ documentation:

The QGridLayout class lays out widgets in a grid.

QGridLayout takes the space made available to it (by its parent layout or by the parentWidget()), divides it up into rows and columns, and puts each widget it manages into the correct cell.

Columns and rows behave identically; we will discuss columns, but there are equivalent functions for rows.

Each column has a minimum width and a stretch factor. The minimum width is the greatest of that set using setColumnMinimumWidth() and the minimum width of each widget in that column. The stretch factor is set using setColumnStretch() and determines how much of the available space the column will get over and above its necessary minimum.

Normally, each managed widget or layout is put into a cell of its own using addWidget(). It is also possible for a widget to occupy multiple cells using the row and column spanning overloads of addItem() and addWidget(). If you do this, QGridLayout will guess how to distribute the size over the columns/rows (based on the stretch factors).

To remove a widget from a layout, call removeWidget(). Calling QWidget::hide() on a widget also effectively removes the widget from the layout until QWidget::show() is called.

This illustration shows a fragment of a dialog with a five-column, three-row grid (the grid is shown overlaid in magenta):

Columns 0, 2 and 4 in this dialog fragment are made up of a QLabel, a QLineEdit, and a QListBox. Columns 1 and 3 are placeholders made with setColumnMinimumWidth(). Row 0 consists of three QLabel objects, row 1 of three QLineEdit objects and row 2 of three QListBox objects. We used placeholder columns (1 and 3) to get the right amount of space between the columns.

Note that the columns and rows are not equally wide or tall. If you want two columns to have the same width, you must set their minimum widths and stretch factors to be the same yourself. You do this using setColumnMinimumWidth() and setColumnStretch().

If the QGridLayout is not the top-level layout (i.e. does not manage all of the widget's area and children), you must add it to its parent layout when you create it, but before you do anything with it. The normal way to add a layout is by calling addLayout() on the parent layout.

Once you have added your layout you can start putting widgets and other layouts into the cells of your grid layout using addWidget(), addItem(), and addLayout().

QGridLayout also includes two margin widths: the contents margin and the spacing(). The contents margin is the width of the reserved space along each of the QGridLayout's four sides. The spacing() is the width of the automatically allocated spacing between neighboring boxes.

The default contents margin values are provided by the style. The default value Qt styles specify is 9 for child widgets and 11 for windows. The spacing defaults to the same as the margin width for a top-level layout, or to the same as the parent layout.

Implementations

impl QGridLayout

pub unsafe fn add_item_6a( &self, item: impl CastInto<Ptr<QLayoutItem>>, row: c_int, column: c_int, row_span: c_int, column_span: c_int, arg6: QFlags<AlignmentFlag>, )

Adds item at position row, column, spanning rowSpan rows and columnSpan columns, and aligns it according to alignment. If rowSpan and/or columnSpan is -1, then the item will extend to the bottom and/or right edge, respectively. The layout takes ownership of the item.

Calls C++ function: void QGridLayout::addItem(QLayoutItem* item, int row, int column, int rowSpan = …, int columnSpan = …, QFlags<Qt::AlignmentFlag> arg6 = …).

C++ documentation:

Adds item at position row, column, spanning rowSpan rows and columnSpan columns, and aligns it according to alignment. If rowSpan and/or columnSpan is -1, then the item will extend to the bottom and/or right edge, respectively. The layout takes ownership of the item.

Warning: Do not use this function to add child layouts or child widget items. Use addLayout() or addWidget() instead.

pub unsafe fn add_item_5a( &self, item: impl CastInto<Ptr<QLayoutItem>>, row: c_int, column: c_int, row_span: c_int, column_span: c_int, )

Adds item at position row, column, spanning rowSpan rows and columnSpan columns, and aligns it according to alignment. If rowSpan and/or columnSpan is -1, then the item will extend to the bottom and/or right edge, respectively. The layout takes ownership of the item.

Calls C++ function: void QGridLayout::addItem(QLayoutItem* item, int row, int column, int rowSpan = …, int columnSpan = …).

C++ documentation:

Adds item at position row, column, spanning rowSpan rows and columnSpan columns, and aligns it according to alignment. If rowSpan and/or columnSpan is -1, then the item will extend to the bottom and/or right edge, respectively. The layout takes ownership of the item.

Warning: Do not use this function to add child layouts or child widget items. Use addLayout() or addWidget() instead.

pub unsafe fn add_item_4a( &self, item: impl CastInto<Ptr<QLayoutItem>>, row: c_int, column: c_int, row_span: c_int, )

Adds item at position row, column, spanning rowSpan rows and columnSpan columns, and aligns it according to alignment. If rowSpan and/or columnSpan is -1, then the item will extend to the bottom and/or right edge, respectively. The layout takes ownership of the item.

Calls C++ function: void QGridLayout::addItem(QLayoutItem* item, int row, int column, int rowSpan = …).

C++ documentation:

Adds item at position row, column, spanning rowSpan rows and columnSpan columns, and aligns it according to alignment. If rowSpan and/or columnSpan is -1, then the item will extend to the bottom and/or right edge, respectively. The layout takes ownership of the item.

Warning: Do not use this function to add child layouts or child widget items. Use addLayout() or addWidget() instead.

pub unsafe fn add_item_3a( &self, item: impl CastInto<Ptr<QLayoutItem>>, row: c_int, column: c_int, )

Adds item at position row, column, spanning rowSpan rows and columnSpan columns, and aligns it according to alignment. If rowSpan and/or columnSpan is -1, then the item will extend to the bottom and/or right edge, respectively. The layout takes ownership of the item.

Calls C++ function: void QGridLayout::addItem(QLayoutItem* item, int row, int column).

C++ documentation:

Adds item at position row, column, spanning rowSpan rows and columnSpan columns, and aligns it according to alignment. If rowSpan and/or columnSpan is -1, then the item will extend to the bottom and/or right edge, respectively. The layout takes ownership of the item.

Warning: Do not use this function to add child layouts or child widget items. Use addLayout() or addWidget() instead.

pub unsafe fn add_layout_4a( &self, arg1: impl CastInto<Ptr<QLayout>>, row: c_int, column: c_int, arg4: QFlags<AlignmentFlag>, )

Places the layout at position (row, column) in the grid. The top-left position is (0, 0).

Calls C++ function: void QGridLayout::addLayout(QLayout* arg1, int row, int column, QFlags<Qt::AlignmentFlag> arg4 = …).

C++ documentation:

Places the layout at position (row, column) in the grid. The top-left position is (0, 0).

The alignment is specified by alignment. The default alignment is 0, which means that the widget fills the entire cell.

A non-zero alignment indicates that the layout should not grow to fill the available space but should be sized according to sizeHint().

layout becomes a child of the grid layout.

pub unsafe fn add_layout_6a( &self, arg1: impl CastInto<Ptr<QLayout>>, row: c_int, column: c_int, row_span: c_int, column_span: c_int, arg6: QFlags<AlignmentFlag>, )

This is an overloaded function.

Calls C++ function: void QGridLayout::addLayout(QLayout* arg1, int row, int column, int rowSpan, int columnSpan, QFlags<Qt::AlignmentFlag> arg6 = …).

C++ documentation:

This is an overloaded function.

This version adds the layout layout to the cell grid, spanning multiple rows/columns. The cell will start at row, column spanning rowSpan rows and columnSpan columns.

If rowSpan and/or columnSpan is -1, then the layout will extend to the bottom and/or right edge, respectively.

pub unsafe fn add_layout_3a( &self, arg1: impl CastInto<Ptr<QLayout>>, row: c_int, column: c_int, )

Places the layout at position (row, column) in the grid. The top-left position is (0, 0).

Calls C++ function: void QGridLayout::addLayout(QLayout* arg1, int row, int column).

C++ documentation:

Places the layout at position (row, column) in the grid. The top-left position is (0, 0).

The alignment is specified by alignment. The default alignment is 0, which means that the widget fills the entire cell.

A non-zero alignment indicates that the layout should not grow to fill the available space but should be sized according to sizeHint().

layout becomes a child of the grid layout.

pub unsafe fn add_layout_5a( &self, arg1: impl CastInto<Ptr<QLayout>>, row: c_int, column: c_int, row_span: c_int, column_span: c_int, )

This is an overloaded function.

Calls C++ function: void QGridLayout::addLayout(QLayout* arg1, int row, int column, int rowSpan, int columnSpan).

C++ documentation:

This is an overloaded function.

This version adds the layout layout to the cell grid, spanning multiple rows/columns. The cell will start at row, column spanning rowSpan rows and columnSpan columns.

If rowSpan and/or columnSpan is -1, then the layout will extend to the bottom and/or right edge, respectively.

pub unsafe fn add_widget_1a(&self, w: impl CastInto<Ptr<QWidget>>)

Calls C++ function: void QGridLayout::addWidget(QWidget* w).

pub unsafe fn add_widget_4a( &self, arg1: impl CastInto<Ptr<QWidget>>, row: c_int, column: c_int, arg4: QFlags<AlignmentFlag>, )

Adds the given widget to the cell grid at row, column. The top-left position is (0, 0) by default.

Calls C++ function: void QGridLayout::addWidget(QWidget* arg1, int row, int column, QFlags<Qt::AlignmentFlag> arg4 = …).

C++ documentation:

Adds the given widget to the cell grid at row, column. The top-left position is (0, 0) by default.

The alignment is specified by alignment. The default alignment is 0, which means that the widget fills the entire cell.

pub unsafe fn add_widget_6a( &self, arg1: impl CastInto<Ptr<QWidget>>, row: c_int, column: c_int, row_span: c_int, column_span: c_int, arg6: QFlags<AlignmentFlag>, )

This is an overloaded function.

Calls C++ function: void QGridLayout::addWidget(QWidget* arg1, int row, int column, int rowSpan, int columnSpan, QFlags<Qt::AlignmentFlag> arg6 = …).

C++ documentation:

This is an overloaded function.

This version adds the given widget to the cell grid, spanning multiple rows/columns. The cell will start at fromRow, fromColumn spanning rowSpan rows and columnSpan columns. The widget will have the given alignment.

If rowSpan and/or columnSpan is -1, then the widget will extend to the bottom and/or right edge, respectively.

pub unsafe fn add_widget_3a( &self, arg1: impl CastInto<Ptr<QWidget>>, row: c_int, column: c_int, )

Adds the given widget to the cell grid at row, column. The top-left position is (0, 0) by default.

Calls C++ function: void QGridLayout::addWidget(QWidget* arg1, int row, int column).

C++ documentation:

Adds the given widget to the cell grid at row, column. The top-left position is (0, 0) by default.

The alignment is specified by alignment. The default alignment is 0, which means that the widget fills the entire cell.

pub unsafe fn add_widget_5a( &self, arg1: impl CastInto<Ptr<QWidget>>, row: c_int, column: c_int, row_span: c_int, column_span: c_int, )

This is an overloaded function.

Calls C++ function: void QGridLayout::addWidget(QWidget* arg1, int row, int column, int rowSpan, int columnSpan).

C++ documentation:

This is an overloaded function.

This version adds the given widget to the cell grid, spanning multiple rows/columns. The cell will start at fromRow, fromColumn spanning rowSpan rows and columnSpan columns. The widget will have the given alignment.

If rowSpan and/or columnSpan is -1, then the widget will extend to the bottom and/or right edge, respectively.

pub unsafe fn cell_rect(&self, row: c_int, column: c_int) -> CppBox<QRect>

Returns the geometry of the cell with row row and column column in the grid. Returns an invalid rectangle if row or column is outside the grid.

Calls C++ function: QRect QGridLayout::cellRect(int row, int column) const.

C++ documentation:

Returns the geometry of the cell with row row and column column in the grid. Returns an invalid rectangle if row or column is outside the grid.

Warning: in the current version of Qt this function does not return valid results until setGeometry() has been called, i.e. after the parentWidget() is visible.

pub unsafe fn column_count(&self) -> c_int

Returns the number of columns in this grid.

Calls C++ function: int QGridLayout::columnCount() const.

C++ documentation:

Returns the number of columns in this grid.

pub unsafe fn column_minimum_width(&self, column: c_int) -> c_int

Returns the column spacing for column column.

Calls C++ function: int QGridLayout::columnMinimumWidth(int column) const.

C++ documentation:

Returns the column spacing for column column.

See also setColumnMinimumWidth().

pub unsafe fn column_stretch(&self, column: c_int) -> c_int

Returns the stretch factor for column column.

Calls C++ function: int QGridLayout::columnStretch(int column) const.

C++ documentation:

Returns the stretch factor for column column.

See also setColumnStretch().

pub unsafe fn count(&self) -> c_int

Reimplemented from QLayout::count().

Calls C++ function: virtual int QGridLayout::count() const.

C++ documentation:

Reimplemented from QLayout::count().

pub unsafe fn expanding_directions(&self) -> QFlags<Orientation>

Reimplemented from QLayoutItem::expandingDirections().

Calls C++ function: virtual QFlags<Qt::Orientation> QGridLayout::expandingDirections() const.

C++ documentation:

Reimplemented from QLayoutItem::expandingDirections().

pub unsafe fn get_item_position( &self, idx: c_int, row: *mut c_int, column: *mut c_int, row_span: *mut c_int, column_span: *mut c_int, )

Returns the position information of the item with the given index.

Calls C++ function: void QGridLayout::getItemPosition(int idx, int* row, int* column, int* rowSpan, int* columnSpan) const.

C++ documentation:

Returns the position information of the item with the given index.

The variables passed as row and column are updated with the position of the item in the layout, and the rowSpan and columnSpan variables are updated with the vertical and horizontal spans of the item.

See also itemAtPosition() and itemAt().

pub unsafe fn has_height_for_width(&self) -> bool

Reimplemented from QLayoutItem::hasHeightForWidth().

Calls C++ function: virtual bool QGridLayout::hasHeightForWidth() const.

C++ documentation:

Reimplemented from QLayoutItem::hasHeightForWidth().

pub unsafe fn height_for_width(&self, arg1: c_int) -> c_int

Reimplemented from QLayoutItem::heightForWidth().

Calls C++ function: virtual int QGridLayout::heightForWidth(int arg1) const.

C++ documentation:

Reimplemented from QLayoutItem::heightForWidth().

pub unsafe fn horizontal_spacing(&self) -> c_int

This property holds the spacing between widgets that are laid out side by side

Calls C++ function: int QGridLayout::horizontalSpacing() const.

C++ documentation:

This property holds the spacing between widgets that are laid out side by side

If no value is explicitly set, the layout's horizontal spacing is inherited from the parent layout, or from the style settings for the parent widget.

This property was introduced in Qt 4.3.

Access functions:

int	horizontalSpacing() const
void	setHorizontalSpacing(int spacing)

See also verticalSpacing, QStyle::pixelMetric(), and PM_LayoutHorizontalSpacing.

pub unsafe fn invalidate(&self)

Reimplemented from QLayoutItem::invalidate().

Calls C++ function: virtual void QGridLayout::invalidate().

C++ documentation:

Reimplemented from QLayoutItem::invalidate().

pub unsafe fn item_at(&self, index: c_int) -> Ptr<QLayoutItem>

Reimplemented from QLayout::itemAt().

Calls C++ function: virtual QLayoutItem* QGridLayout::itemAt(int index) const.

C++ documentation:

Reimplemented from QLayout::itemAt().

pub unsafe fn item_at_position( &self, row: c_int, column: c_int, ) -> Ptr<QLayoutItem>

Returns the layout item that occupies cell (row, column), or 0 if the cell is empty.

Calls C++ function: QLayoutItem* QGridLayout::itemAtPosition(int row, int column) const.

C++ documentation:

Returns the layout item that occupies cell (row, column), or 0 if the cell is empty.

This function was introduced in Qt 4.4.

See also getItemPosition() and indexOf().

pub unsafe fn maximum_size(&self) -> CppBox<QSize>

Reimplemented from QLayoutItem::maximumSize().

Calls C++ function: virtual QSize QGridLayout::maximumSize() const.

C++ documentation:

Reimplemented from QLayoutItem::maximumSize().

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Calls C++ function: virtual const QMetaObject* QGridLayout::metaObject() const.

pub unsafe fn minimum_height_for_width(&self, arg1: c_int) -> c_int

Reimplemented from QLayoutItem::minimumHeightForWidth().

Calls C++ function: virtual int QGridLayout::minimumHeightForWidth(int arg1) const.

C++ documentation:

Reimplemented from QLayoutItem::minimumHeightForWidth().

pub unsafe fn minimum_size(&self) -> CppBox<QSize>

Reimplemented from QLayoutItem::minimumSize().

Calls C++ function: virtual QSize QGridLayout::minimumSize() const.

C++ documentation:

Reimplemented from QLayoutItem::minimumSize().

pub unsafe fn new_1a(parent: impl CastInto<Ptr<QWidget>>) -> QBox<QGridLayout>

Constructs a new QGridLayout with parent widget, parent. The layout has one row and one column initially, and will expand when new items are inserted.

Calls C++ function: [constructor] void QGridLayout::QGridLayout(QWidget* parent).

C++ documentation:

Constructs a new QGridLayout with parent widget, parent. The layout has one row and one column initially, and will expand when new items are inserted.

pub unsafe fn new_0a() -> QBox<QGridLayout>

Constructs a new grid layout.

Calls C++ function: [constructor] void QGridLayout::QGridLayout().

C++ documentation:

Constructs a new grid layout.

You must insert this grid into another layout. You can insert widgets and layouts into this layout at any time, but laying out will not be performed before this is inserted into another layout.

pub unsafe fn origin_corner(&self) -> Corner

Returns the corner that's used for the grid's origin, i.e. for position (0, 0).

Calls C++ function: Qt::Corner QGridLayout::originCorner() const.

C++ documentation:

Returns the corner that’s used for the grid’s origin, i.e. for position (0, 0).

See also setOriginCorner().

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: c_int, arg3: *mut *mut c_void, ) -> c_int

Calls C++ function: virtual int QGridLayout::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const c_char) -> *mut c_void

Calls C++ function: virtual void* QGridLayout::qt_metacast(const char* arg1).

pub unsafe fn row_count(&self) -> c_int

Returns the number of rows in this grid.

Calls C++ function: int QGridLayout::rowCount() const.

C++ documentation:

Returns the number of rows in this grid.

pub unsafe fn row_minimum_height(&self, row: c_int) -> c_int

Returns the minimum width set for row row.

Calls C++ function: int QGridLayout::rowMinimumHeight(int row) const.

C++ documentation:

Returns the minimum width set for row row.

See also setRowMinimumHeight().

pub unsafe fn row_stretch(&self, row: c_int) -> c_int

Returns the stretch factor for row row.

Calls C++ function: int QGridLayout::rowStretch(int row) const.

C++ documentation:

Returns the stretch factor for row row.

See also setRowStretch().

pub unsafe fn set_column_minimum_width(&self, column: c_int, min_size: c_int)

Sets the minimum width of column column to minSize pixels.

Calls C++ function: void QGridLayout::setColumnMinimumWidth(int column, int minSize).

C++ documentation:

Sets the minimum width of column column to minSize pixels.

See also columnMinimumWidth() and setRowMinimumHeight().

pub unsafe fn set_column_stretch(&self, column: c_int, stretch: c_int)

Sets the stretch factor of column column to stretch. The first column is number 0.

Calls C++ function: void QGridLayout::setColumnStretch(int column, int stretch).

C++ documentation:

Sets the stretch factor of column column to stretch. The first column is number 0.

The stretch factor is relative to the other columns in this grid. Columns with a higher stretch factor take more of the available space.

The default stretch factor is 0. If the stretch factor is 0 and no other column in this table can grow at all, the column may still grow.

An alternative approach is to add spacing using addItem() with a QSpacerItem.

See also columnStretch() and setRowStretch().

pub unsafe fn set_default_positioning(&self, n: c_int, orient: Orientation)

Calls C++ function: void QGridLayout::setDefaultPositioning(int n, Qt::Orientation orient).

pub unsafe fn set_geometry(&self, arg1: impl CastInto<Ref<QRect>>)

Reimplemented from QLayoutItem::setGeometry().

Calls C++ function: virtual void QGridLayout::setGeometry(const QRect& arg1).

C++ documentation:

Reimplemented from QLayoutItem::setGeometry().

pub unsafe fn set_horizontal_spacing(&self, spacing: c_int)

This property holds the spacing between widgets that are laid out side by side

Calls C++ function: void QGridLayout::setHorizontalSpacing(int spacing).

C++ documentation:

This property holds the spacing between widgets that are laid out side by side

If no value is explicitly set, the layout's horizontal spacing is inherited from the parent layout, or from the style settings for the parent widget.

This property was introduced in Qt 4.3.

Access functions:

int	horizontalSpacing() const
void	setHorizontalSpacing(int spacing)

See also verticalSpacing, QStyle::pixelMetric(), and PM_LayoutHorizontalSpacing.

pub unsafe fn set_origin_corner(&self, arg1: Corner)

Sets the grid's origin corner, i.e. position (0, 0), to corner.

Calls C++ function: void QGridLayout::setOriginCorner(Qt::Corner arg1).

C++ documentation:

Sets the grid’s origin corner, i.e. position (0, 0), to corner.

See also originCorner().

pub unsafe fn set_row_minimum_height(&self, row: c_int, min_size: c_int)

Sets the minimum height of row row to minSize pixels.

Calls C++ function: void QGridLayout::setRowMinimumHeight(int row, int minSize).

C++ documentation:

Sets the minimum height of row row to minSize pixels.

See also rowMinimumHeight() and setColumnMinimumWidth().

pub unsafe fn set_row_stretch(&self, row: c_int, stretch: c_int)

Sets the stretch factor of row row to stretch. The first row is number 0.

Calls C++ function: void QGridLayout::setRowStretch(int row, int stretch).

C++ documentation:

Sets the stretch factor of row row to stretch. The first row is number 0.

The stretch factor is relative to the other rows in this grid. Rows with a higher stretch factor take more of the available space.

The default stretch factor is 0. If the stretch factor is 0 and no other row in this table can grow at all, the row may still grow.

See also rowStretch(), setRowMinimumHeight(), and setColumnStretch().

pub unsafe fn set_spacing(&self, spacing: c_int)

This function sets both the vertical and horizontal spacing to spacing.

Calls C++ function: void QGridLayout::setSpacing(int spacing).

C++ documentation:

This function sets both the vertical and horizontal spacing to spacing.

See also spacing(), setVerticalSpacing(), and setHorizontalSpacing().

pub unsafe fn set_vertical_spacing(&self, spacing: c_int)

This property holds the spacing between widgets that are laid out on top of each other

Calls C++ function: void QGridLayout::setVerticalSpacing(int spacing).

C++ documentation:

This property holds the spacing between widgets that are laid out on top of each other

If no value is explicitly set, the layout's vertical spacing is inherited from the parent layout, or from the style settings for the parent widget.

This property was introduced in Qt 4.3.

Access functions:

int	verticalSpacing() const
void	setVerticalSpacing(int spacing)

See also horizontalSpacing, QStyle::pixelMetric(), and PM_LayoutHorizontalSpacing.

pub unsafe fn size_hint(&self) -> CppBox<QSize>

Reimplemented from QLayoutItem::sizeHint().

Calls C++ function: virtual QSize QGridLayout::sizeHint() const.

C++ documentation:

Reimplemented from QLayoutItem::sizeHint().

pub unsafe fn spacing(&self) -> c_int

If the vertical spacing is equal to the horizontal spacing, this function returns that value; otherwise it return -1.

Calls C++ function: int QGridLayout::spacing() const.

C++ documentation:

If the vertical spacing is equal to the horizontal spacing, this function returns that value; otherwise it return -1.

See also setSpacing(), verticalSpacing(), and horizontalSpacing().

pub unsafe fn static_meta_object() -> Ref<QMetaObject>

Returns a reference to the staticMetaObject field.

pub unsafe fn take_at(&self, index: c_int) -> Ptr<QLayoutItem>

Reimplemented from QLayout::takeAt().

Calls C++ function: virtual QLayoutItem* QGridLayout::takeAt(int index).

C++ documentation:

Reimplemented from QLayout::takeAt().

pub unsafe fn tr( s: *const c_char, c: *const c_char, n: c_int, ) -> CppBox<QString>

Calls C++ function: static QString QGridLayout::tr(const char* s, const char* c, int n).

pub unsafe fn tr_utf8( s: *const c_char, c: *const c_char, n: c_int, ) -> CppBox<QString>

Calls C++ function: static QString QGridLayout::trUtf8(const char* s, const char* c, int n).

pub unsafe fn vertical_spacing(&self) -> c_int

This property holds the spacing between widgets that are laid out on top of each other

Calls C++ function: int QGridLayout::verticalSpacing() const.

C++ documentation:

This property holds the spacing between widgets that are laid out on top of each other

If no value is explicitly set, the layout's vertical spacing is inherited from the parent layout, or from the style settings for the parent widget.

This property was introduced in Qt 4.3.

Access functions:

int	verticalSpacing() const
void	setVerticalSpacing(int spacing)

See also horizontalSpacing, QStyle::pixelMetric(), and PM_LayoutHorizontalSpacing.

Methods from Deref<Target = QLayout>

pub unsafe fn activate(&self) -> bool

Redoes the layout for parentWidget() if necessary.

Calls C++ function: bool QLayout::activate().

C++ documentation:

Redoes the layout for parentWidget() if necessary.

You should generally not need to call this because it is automatically called at the most appropriate times. It returns true if the layout was redone.

See also update() and QWidget::updateGeometry().

pub unsafe fn add_item(&self, arg1: impl CastInto<Ptr<QLayoutItem>>)

Implemented in subclasses to add an item. How it is added is specific to each subclass.

Calls C++ function: pure virtual void QLayout::addItem(QLayoutItem* arg1).

C++ documentation:

Implemented in subclasses to add an item. How it is added is specific to each subclass.

This function is not usually called in application code. To add a widget to a layout, use the addWidget() function; to add a child layout, use the addLayout() function provided by the relevant QLayout subclass.

Note: The ownership of item is transferred to the layout, and it's the layout's responsibility to delete it.

See also addWidget(), QBoxLayout::addLayout(), and QGridLayout::addLayout().

pub unsafe fn add_widget(&self, w: impl CastInto<Ptr<QWidget>>)

Adds widget w to this layout in a manner specific to the layout. This function uses addItem().

Calls C++ function: void QLayout::addWidget(QWidget* w).

C++ documentation:

Adds widget w to this layout in a manner specific to the layout. This function uses addItem().

pub unsafe fn contents_margins(&self) -> CppBox<QMargins>

Returns the margins used around the layout.

Calls C++ function: QMargins QLayout::contentsMargins() const.

C++ documentation:

Returns the margins used around the layout.

By default, QLayout uses the values provided by the style. On most platforms, the margin is 11 pixels in all directions.

This function was introduced in Qt 4.6.

See also setContentsMargins().

pub unsafe fn contents_rect(&self) -> CppBox<QRect>

Returns the layout's geometry() rectangle, but taking into account the contents margins.

Calls C++ function: QRect QLayout::contentsRect() const.

C++ documentation:

Returns the layout’s geometry() rectangle, but taking into account the contents margins.

This function was introduced in Qt 4.3.

See also setContentsMargins() and getContentsMargins().

pub unsafe fn control_types(&self) -> QFlags<ControlType>

Reimplemented from QLayoutItem::controlTypes().

Calls C++ function: virtual QFlags<QSizePolicy::ControlType> QLayout::controlTypes() const.

C++ documentation:

Reimplemented from QLayoutItem::controlTypes().

pub unsafe fn count(&self) -> c_int

Must be implemented in subclasses to return the number of items in the layout.

Calls C++ function: pure virtual int QLayout::count() const.

C++ documentation:

Must be implemented in subclasses to return the number of items in the layout.

See also itemAt().

pub unsafe fn expanding_directions(&self) -> QFlags<Orientation>

Reimplemented from QLayoutItem::expandingDirections().

Calls C++ function: virtual QFlags<Qt::Orientation> QLayout::expandingDirections() const.

C++ documentation:

Reimplemented from QLayoutItem::expandingDirections().

Returns whether this layout can make use of more space than sizeHint(). A value of Qt::Vertical or Qt::Horizontal means that it wants to grow in only one dimension, whereas Qt::Vertical | Qt::Horizontal means that it wants to grow in both dimensions.

The default implementation returns Qt::Horizontal | Qt::Vertical. Subclasses reimplement it to return a meaningful value based on their child widgets's size policies.

See also sizeHint().

pub unsafe fn geometry(&self) -> CppBox<QRect>

Reimplemented from QLayoutItem::geometry().

Calls C++ function: virtual QRect QLayout::geometry() const.

C++ documentation:

Reimplemented from QLayoutItem::geometry().

See also setGeometry().

pub unsafe fn get_contents_margins( &self, left: *mut c_int, top: *mut c_int, right: *mut c_int, bottom: *mut c_int, )

Extracts the left, top, right, and bottom margins used around the layout, and assigns them to *left, *top, *right, and *bottom (unless they are null pointers).

Calls C++ function: void QLayout::getContentsMargins(int* left, int* top, int* right, int* bottom) const.

C++ documentation:

Extracts the left, top, right, and bottom margins used around the layout, and assigns them to *left, *top, *right, and *bottom (unless they are null pointers).

By default, QLayout uses the values provided by the style. On most platforms, the margin is 11 pixels in all directions.

This function was introduced in Qt 4.3.

See also setContentsMargins(), QStyle::pixelMetric(), PM_LayoutLeftMargin, PM_LayoutTopMargin, PM_LayoutRightMargin, and PM_LayoutBottomMargin.

pub unsafe fn index_of_q_widget( &self, arg1: impl CastInto<Ptr<QWidget>>, ) -> c_int

Searches for widget widget in this layout (not including child layouts).

Calls C++ function: virtual int QLayout::indexOf(QWidget* arg1) const.

C++ documentation:

Searches for widget widget in this layout (not including child layouts).

Returns the index of widget, or -1 if widget is not found.

The default implementation iterates over all items using itemAt()

pub unsafe fn index_of_q_layout_item( &self, arg1: impl CastInto<Ptr<QLayoutItem>>, ) -> c_int

Available on cpp_lib_version="5.12.2" or cpp_lib_version="5.13.0" or cpp_lib_version="5.14.0" only.

Searches for layout item layoutItem in this layout (not including child layouts).

Calls C++ function: int QLayout::indexOf(QLayoutItem* arg1) const.

C++ documentation:

Searches for layout item layoutItem in this layout (not including child layouts).

Returns the index of layoutItem, or -1 if layoutItem is not found.

This function was introduced in Qt 5.12.

pub unsafe fn invalidate(&self)

Reimplemented from QLayoutItem::invalidate().

Calls C++ function: virtual void QLayout::invalidate().

C++ documentation:

Reimplemented from QLayoutItem::invalidate().

pub unsafe fn is_empty(&self) -> bool

Reimplemented from QLayoutItem::isEmpty().

Calls C++ function: virtual bool QLayout::isEmpty() const.

C++ documentation:

Reimplemented from QLayoutItem::isEmpty().

pub unsafe fn is_enabled(&self) -> bool

Returns true if the layout is enabled; otherwise returns false.

Calls C++ function: bool QLayout::isEnabled() const.

C++ documentation:

Returns true if the layout is enabled; otherwise returns false.

See also setEnabled().

pub unsafe fn item_at(&self, index: c_int) -> Ptr<QLayoutItem>

Must be implemented in subclasses to return the layout item at index. If there is no such item, the function must return 0. Items are numbered consecutively from 0. If an item is deleted, other items will be renumbered.

Calls C++ function: pure virtual QLayoutItem* QLayout::itemAt(int index) const.

C++ documentation:

Must be implemented in subclasses to return the layout item at index. If there is no such item, the function must return 0. Items are numbered consecutively from 0. If an item is deleted, other items will be renumbered.

This function can be used to iterate over a layout. The following code will draw a rectangle for each layout item in the layout structure of the widget.

static void paintLayout(QPainter painter, QLayoutItem item)
{
      QLayout *layout = item->layout();
      if (layout) {
          for (int i = 0; i < layout->count(); ++i)
              paintLayout(painter, layout->itemAt(i));
      }
      painter->drawRect(item->geometry());
}
void MyWidget::paintEvent(QPaintEvent *)
{
      QPainter painter(this);
      if (layout())
          paintLayout(&painter, layout());
}

See also count() and takeAt().

pub unsafe fn layout(&self) -> QPtr<QLayout>

Reimplemented from QLayoutItem::layout().

Calls C++ function: virtual QLayout* QLayout::layout().

C++ documentation:

Reimplemented from QLayoutItem::layout().

pub unsafe fn margin(&self) -> c_int

This property holds the width of the outside border of the layout

Calls C++ function: int QLayout::margin() const.

C++ documentation:

This property holds the width of the outside border of the layout

Use setContentsMargins() and getContentsMargins() instead.

Access functions:

int	margin() const
void	setMargin(int margin)

See also contentsRect() and spacing.

Member Function Documentation

pub unsafe fn maximum_size(&self) -> CppBox<QSize>

Reimplemented from QLayoutItem::maximumSize().

Calls C++ function: virtual QSize QLayout::maximumSize() const.

C++ documentation:

Reimplemented from QLayoutItem::maximumSize().

Returns the maximum size of this layout. This is the largest size that the layout can have while still respecting the specifications.

The returned value doesn't include the space required by QWidget::setContentsMargins() or menuBar().

The default implementation allows unlimited resizing.

pub unsafe fn menu_bar(&self) -> QPtr<QWidget>

Returns the menu bar set for this layout, or 0 if no menu bar is set.

Calls C++ function: QWidget* QLayout::menuBar() const.

C++ documentation:

Returns the menu bar set for this layout, or 0 if no menu bar is set.

See also setMenuBar().

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Calls C++ function: virtual const QMetaObject* QLayout::metaObject() const.

pub unsafe fn minimum_size(&self) -> CppBox<QSize>

Reimplemented from QLayoutItem::minimumSize().

Calls C++ function: virtual QSize QLayout::minimumSize() const.

C++ documentation:

Reimplemented from QLayoutItem::minimumSize().

Returns the minimum size of this layout. This is the smallest size that the layout can have while still respecting the specifications.

The returned value doesn't include the space required by QWidget::setContentsMargins() or menuBar().

The default implementation allows unlimited resizing.

pub unsafe fn parent_widget(&self) -> QPtr<QWidget>

Returns the parent widget of this layout, or 0 if this layout is not installed on any widget.

Calls C++ function: QWidget* QLayout::parentWidget() const.

C++ documentation:

Returns the parent widget of this layout, or 0 if this layout is not installed on any widget.

If the layout is a sub-layout, this function returns the parent widget of the parent layout.

See also parent().

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: c_int, arg3: *mut *mut c_void, ) -> c_int

Calls C++ function: virtual int QLayout::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const c_char) -> *mut c_void

Calls C++ function: virtual void* QLayout::qt_metacast(const char* arg1).

pub unsafe fn remove_item(&self, arg1: impl CastInto<Ptr<QLayoutItem>>)

Removes the layout item item from the layout. It is the caller's responsibility to delete the item.

Calls C++ function: void QLayout::removeItem(QLayoutItem* arg1).

C++ documentation:

Removes the layout item item from the layout. It is the caller’s responsibility to delete the item.

Notice that item can be a layout (since QLayout inherits QLayoutItem).

See also removeWidget() and addItem().

pub unsafe fn remove_widget(&self, w: impl CastInto<Ptr<QWidget>>)

Removes the widget widget from the layout. After this call, it is the caller's responsibility to give the widget a reasonable geometry or to put the widget back into a layout or to explicitly hide it if necessary.

Calls C++ function: void QLayout::removeWidget(QWidget* w).

C++ documentation:

Removes the widget widget from the layout. After this call, it is the caller’s responsibility to give the widget a reasonable geometry or to put the widget back into a layout or to explicitly hide it if necessary.

Note: The ownership of widget remains the same as when it was added.

See also removeItem(), QWidget::setGeometry(), and addWidget().

pub unsafe fn replace_widget_3a( &self, from: impl CastInto<Ptr<QWidget>>, to: impl CastInto<Ptr<QWidget>>, options: QFlags<FindChildOption>, ) -> Ptr<QLayoutItem>

Searches for widget from and replaces it with widget to if found. Returns the layout item that contains the widget from on success. Otherwise 0 is returned. If options contains Qt::FindChildrenRecursively (the default), sub-layouts are searched for doing the replacement. Any other flag in options is ignored.

Calls C++ function: QLayoutItem* QLayout::replaceWidget(QWidget* from, QWidget* to, QFlags<Qt::FindChildOption> options = …).

C++ documentation:

Searches for widget from and replaces it with widget to if found. Returns the layout item that contains the widget from on success. Otherwise 0 is returned. If options contains Qt::FindChildrenRecursively (the default), sub-layouts are searched for doing the replacement. Any other flag in options is ignored.

Notice that the returned item therefore might not belong to this layout, but to a sub-layout.

The returned layout item is no longer owned by the layout and should be either deleted or inserted to another layout. The widget from is no longer managed by the layout and may need to be deleted or hidden. The parent of widget from is left unchanged.

This function works for the built-in Qt layouts, but might not work for custom layouts.

This function was introduced in Qt 5.2.

See also indexOf().

pub unsafe fn replace_widget_2a( &self, from: impl CastInto<Ptr<QWidget>>, to: impl CastInto<Ptr<QWidget>>, ) -> Ptr<QLayoutItem>

Searches for widget from and replaces it with widget to if found. Returns the layout item that contains the widget from on success. Otherwise 0 is returned. If options contains Qt::FindChildrenRecursively (the default), sub-layouts are searched for doing the replacement. Any other flag in options is ignored.

Calls C++ function: QLayoutItem* QLayout::replaceWidget(QWidget* from, QWidget* to).

C++ documentation:

Searches for widget from and replaces it with widget to if found. Returns the layout item that contains the widget from on success. Otherwise 0 is returned. If options contains Qt::FindChildrenRecursively (the default), sub-layouts are searched for doing the replacement. Any other flag in options is ignored.

Notice that the returned item therefore might not belong to this layout, but to a sub-layout.

The returned layout item is no longer owned by the layout and should be either deleted or inserted to another layout. The widget from is no longer managed by the layout and may need to be deleted or hidden. The parent of widget from is left unchanged.

This function works for the built-in Qt layouts, but might not work for custom layouts.

This function was introduced in Qt 5.2.

See also indexOf().

pub unsafe fn set_alignment_q_widget_q_flags_alignment_flag( &self, w: impl CastInto<Ptr<QWidget>>, alignment: QFlags<AlignmentFlag>, ) -> bool

Sets the alignment for widget w to alignment and returns true if w is found in this layout (not including child layouts); otherwise returns false.

Calls C++ function: bool QLayout::setAlignment(QWidget* w, QFlags<Qt::AlignmentFlag> alignment).

C++ documentation:

Sets the alignment for widget w to alignment and returns true if w is found in this layout (not including child layouts); otherwise returns false.

pub unsafe fn set_alignment_q_layout_q_flags_alignment_flag( &self, l: impl CastInto<Ptr<QLayout>>, alignment: QFlags<AlignmentFlag>, ) -> bool

This is an overloaded function.

Calls C++ function: bool QLayout::setAlignment(QLayout* l, QFlags<Qt::AlignmentFlag> alignment).

C++ documentation:

This is an overloaded function.

Sets the alignment for the layout l to alignment and returns true if l is found in this layout (not including child layouts); otherwise returns false.

pub unsafe fn set_contents_margins_4a( &self, left: c_int, top: c_int, right: c_int, bottom: c_int, )

Sets the left, top, right, and bottom margins to use around the layout.

Calls C++ function: void QLayout::setContentsMargins(int left, int top, int right, int bottom).

C++ documentation:

Sets the left, top, right, and bottom margins to use around the layout.

By default, QLayout uses the values provided by the style. On most platforms, the margin is 11 pixels in all directions.

This function was introduced in Qt 4.3.

See also contentsMargins(), getContentsMargins(), QStyle::pixelMetric(), PM_LayoutLeftMargin, PM_LayoutTopMargin, PM_LayoutRightMargin, and PM_LayoutBottomMargin.

pub unsafe fn set_contents_margins_1a( &self, margins: impl CastInto<Ref<QMargins>>, )

Sets the margins to use around the layout.

Calls C++ function: void QLayout::setContentsMargins(const QMargins& margins).

C++ documentation:

Sets the margins to use around the layout.

By default, QLayout uses the values provided by the style. On most platforms, the margin is 11 pixels in all directions.

This function was introduced in Qt 4.6.

See also contentsMargins().

pub unsafe fn set_enabled(&self, arg1: bool)

Enables this layout if enable is true, otherwise disables it.

Calls C++ function: void QLayout::setEnabled(bool arg1).

C++ documentation:

Enables this layout if enable is true, otherwise disables it.

An enabled layout adjusts dynamically to changes; a disabled layout acts as if it did not exist.

By default all layouts are enabled.

See also isEnabled().

pub unsafe fn set_geometry(&self, arg1: impl CastInto<Ref<QRect>>)

Reimplemented from QLayoutItem::setGeometry().

Calls C++ function: virtual void QLayout::setGeometry(const QRect& arg1).

C++ documentation:

Reimplemented from QLayoutItem::setGeometry().

See also geometry().

pub unsafe fn set_margin(&self, arg1: c_int)

Note: Setter function for property margin.

Calls C++ function: void QLayout::setMargin(int arg1).

C++ documentation:

Note: Setter function for property margin.

See also margin().

pub unsafe fn set_menu_bar(&self, w: impl CastInto<Ptr<QWidget>>)

Tells the geometry manager to place the menu bar widget at the top of parentWidget(), outside QWidget::contentsMargins(). All child widgets are placed below the bottom edge of the menu bar.

Calls C++ function: void QLayout::setMenuBar(QWidget* w).

C++ documentation:

Tells the geometry manager to place the menu bar widget at the top of parentWidget(), outside QWidget::contentsMargins(). All child widgets are placed below the bottom edge of the menu bar.

See also menuBar().

pub unsafe fn set_size_constraint(&self, arg1: SizeConstraint)

This property holds the resize mode of the layout

Calls C++ function: void QLayout::setSizeConstraint(QLayout::SizeConstraint arg1).

C++ documentation:

This property holds the resize mode of the layout

The default mode is SetDefaultConstraint.

Access functions:

SizeConstraint	sizeConstraint() const
void	setSizeConstraint(SizeConstraint)

pub unsafe fn set_spacing(&self, arg1: c_int)

This property holds the spacing between widgets inside the layout

Calls C++ function: void QLayout::setSpacing(int arg1).

C++ documentation:

This property holds the spacing between widgets inside the layout

If no value is explicitly set, the layout's spacing is inherited from the parent layout, or from the style settings for the parent widget.

For QGridLayout and QFormLayout, it is possible to set different horizontal and vertical spacings using setHorizontalSpacing() and setVerticalSpacing(). In that case, spacing() returns -1.

Access functions:

int	spacing() const
void	setSpacing(int)

See also contentsRect(), getContentsMargins(), QStyle::layoutSpacing(), and QStyle::pixelMetric().

pub unsafe fn size_constraint(&self) -> SizeConstraint

This property holds the resize mode of the layout

Calls C++ function: QLayout::SizeConstraint QLayout::sizeConstraint() const.

C++ documentation:

This property holds the resize mode of the layout

The default mode is SetDefaultConstraint.

Access functions:

SizeConstraint	sizeConstraint() const
void	setSizeConstraint(SizeConstraint)

pub unsafe fn spacing(&self) -> c_int

This property holds the spacing between widgets inside the layout

Calls C++ function: int QLayout::spacing() const.

C++ documentation:

This property holds the spacing between widgets inside the layout

If no value is explicitly set, the layout's spacing is inherited from the parent layout, or from the style settings for the parent widget.

For QGridLayout and QFormLayout, it is possible to set different horizontal and vertical spacings using setHorizontalSpacing() and setVerticalSpacing(). In that case, spacing() returns -1.

Access functions:

int	spacing() const
void	setSpacing(int)

See also contentsRect(), getContentsMargins(), QStyle::layoutSpacing(), and QStyle::pixelMetric().

pub unsafe fn take_at(&self, index: c_int) -> Ptr<QLayoutItem>

Must be implemented in subclasses to remove the layout item at index from the layout, and return the item. If there is no such item, the function must do nothing and return 0. Items are numbered consecutively from 0. If an item is removed, other items will be renumbered.

Calls C++ function: pure virtual QLayoutItem* QLayout::takeAt(int index).

C++ documentation:

Must be implemented in subclasses to remove the layout item at index from the layout, and return the item. If there is no such item, the function must do nothing and return 0. Items are numbered consecutively from 0. If an item is removed, other items will be renumbered.

The following code fragment shows a safe way to remove all items from a layout:

QLayoutItem *child;
while ((child = layout->takeAt(0)) != 0) {
      ...
      delete child;
}

See also itemAt() and count().

pub unsafe fn total_height_for_width(&self, w: c_int) -> c_int

Calls C++ function: int QLayout::totalHeightForWidth(int w) const.

pub unsafe fn total_maximum_size(&self) -> CppBox<QSize>

Calls C++ function: QSize QLayout::totalMaximumSize() const.

pub unsafe fn total_minimum_size(&self) -> CppBox<QSize>

Calls C++ function: QSize QLayout::totalMinimumSize() const.

pub unsafe fn total_size_hint(&self) -> CppBox<QSize>

Calls C++ function: QSize QLayout::totalSizeHint() const.

pub unsafe fn update(&self)

Updates the layout for parentWidget().

Calls C++ function: void QLayout::update().

C++ documentation:

Updates the layout for parentWidget().

You should generally not need to call this because it is automatically called at the most appropriate times.

See also activate() and invalidate().

Methods from Deref<Target = QObject>

pub unsafe fn find_child<T>( &self, name: &str, ) -> Result<QPtr<T>, FindChildError>

where QObject: DynamicCast<T>, T: StaticUpcast<QObject>,

Finds a child of self with the specified object name and casts it to type T.

The search is performed recursively. If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned.

Returns an error if there is no child object with object name name or the found object cannot be cast to T.

pub fn destroyed(&self) -> Signal<(*mut QObject,)>

This signal is emitted immediately before the object obj is destroyed, and can not be blocked.

Returns a built-in Qt signal QObject::destroyed that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted immediately before the object obj is destroyed, and can not be blocked.

All the objects's children are destroyed immediately after this signal is emitted.

See also deleteLater() and QPointer.

pub fn object_name_changed(&self) -> Signal<(*const QString,)>

This signal is emitted after the object's name has been changed. The new object name is passed as objectName.

Returns a built-in Qt signal QObject::objectNameChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted after the object’s name has been changed. The new object name is passed as objectName.

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

Note: Notifier signal for property objectName.

See also QObject::objectName.

pub fn slot_delete_later(&self) -> Receiver<()>

Schedules this object for deletion.

Returns a built-in Qt slot QObject::deleteLater that can be passed to qt_core::Signal::connect.

C++ documentation:

Schedules this object for deletion.

The object will be deleted when control returns to the event loop. If the event loop is not running when this function is called (e.g. deleteLater() is called on an object before QCoreApplication::exec()), the object will be deleted once the event loop is started. If deleteLater() is called after the main event loop has stopped, the object will not be deleted. Since Qt 4.8, if deleteLater() is called on an object that lives in a thread with no running event loop, the object will be destroyed when the thread finishes.

Note that entering and leaving a new event loop (e.g., by opening a modal dialog) will not perform the deferred deletion; for the object to be deleted, the control must return to the event loop from which deleteLater() was called.

Note: It is safe to call this function more than once; when the first deferred deletion event is delivered, any pending events for the object are removed from the event queue.

See also destroyed() and QPointer.

pub unsafe fn block_signals(&self, b: bool) -> bool

If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). If block is false, no such blocking will occur.

Calls C++ function: bool QObject::blockSignals(bool b).

C++ documentation:

If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). If block is false, no such blocking will occur.

The return value is the previous value of signalsBlocked().

Note that the destroyed() signal will be emitted even if the signals for this object have been blocked.

Signals emitted while being blocked are not buffered.

See also signalsBlocked() and QSignalBlocker.

pub unsafe fn children(&self) -> Ref<QListOfQObject>

Returns a list of child objects. The QObjectList class is defined in the <QObject> header file as the following:

Calls C++ function: const QList<QObject*>& QObject::children() const.

C++ documentation:

Returns a list of child objects. The QObjectList class is defined in the <QObject> header file as the following:

  typedef QList<QObject*> QObjectList;

The first child added is the first object in the list and the last child added is the last object in the list, i.e. new children are appended at the end.

Note that the list order changes when QWidget children are raised or lowered. A widget that is raised becomes the last object in the list, and a widget that is lowered becomes the first object in the list.

See also findChild(), findChildren(), parent(), and setParent().

pub unsafe fn delete_later(&self)

Schedules this object for deletion.

Calls C++ function: [slot] void QObject::deleteLater().

C++ documentation:

Schedules this object for deletion.

The object will be deleted when control returns to the event loop. If the event loop is not running when this function is called (e.g. deleteLater() is called on an object before QCoreApplication::exec()), the object will be deleted once the event loop is started. If deleteLater() is called after the main event loop has stopped, the object will not be deleted. Since Qt 4.8, if deleteLater() is called on an object that lives in a thread with no running event loop, the object will be destroyed when the thread finishes.

Note that entering and leaving a new event loop (e.g., by opening a modal dialog) will not perform the deferred deletion; for the object to be deleted, the control must return to the event loop from which deleteLater() was called.

Note: It is safe to call this function more than once; when the first deferred deletion event is delivered, any pending events for the object are removed from the event queue.

See also destroyed() and QPointer.

pub unsafe fn disconnect_char_q_object_char( &self, signal: *const i8, receiver: impl CastInto<Ptr<QObject>>, member: *const i8, ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …, const QObject* receiver = …, const char* member = …) const.

C++ documentation:

This function overloads disconnect().

Disconnects signal from method of receiver.

A signal-slot connection is removed when either of the objects involved are destroyed.

Note: This function is thread-safe.

pub unsafe fn disconnect_q_object_char( &self, receiver: impl CastInto<Ptr<QObject>>, member: *const i8, ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const QObject* receiver, const char* member = …) const.

C++ documentation:

This function overloads disconnect().

Disconnects all signals in this object from receiver's method.

A signal-slot connection is removed when either of the objects involved are destroyed.

pub unsafe fn disconnect_char_q_object( &self, signal: *const i8, receiver: impl CastInto<Ptr<QObject>>, ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …, const QObject* receiver = …) const.

C++ documentation:

This function overloads disconnect().

Disconnects signal from method of receiver.

A signal-slot connection is removed when either of the objects involved are destroyed.

Note: This function is thread-safe.

pub unsafe fn disconnect_char(&self, signal: *const i8) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …) const.

C++ documentation:

This function overloads disconnect().

Disconnects signal from method of receiver.

A signal-slot connection is removed when either of the objects involved are destroyed.

Note: This function is thread-safe.

pub unsafe fn disconnect(&self) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect() const.

C++ documentation:

This function overloads disconnect().

Disconnects signal from method of receiver.

A signal-slot connection is removed when either of the objects involved are destroyed.

Note: This function is thread-safe.

pub unsafe fn disconnect_q_object( &self, receiver: impl CastInto<Ptr<QObject>>, ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const QObject* receiver) const.

C++ documentation:

This function overloads disconnect().

Disconnects all signals in this object from receiver's method.

A signal-slot connection is removed when either of the objects involved are destroyed.

pub unsafe fn dump_object_info_mut(&self)

Dumps information about signal connections, etc. for this object to the debug output.

Calls C++ function: void QObject::dumpObjectInfo().

C++ documentation:

Dumps information about signal connections, etc. for this object to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectTree().

pub unsafe fn dump_object_info(&self)

Dumps information about signal connections, etc. for this object to the debug output.

Calls C++ function: void QObject::dumpObjectInfo() const.

C++ documentation:

Dumps information about signal connections, etc. for this object to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectTree().

pub unsafe fn dump_object_tree_mut(&self)

Dumps a tree of children to the debug output.

Calls C++ function: void QObject::dumpObjectTree().

C++ documentation:

Dumps a tree of children to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectInfo().

pub unsafe fn dump_object_tree(&self)

Dumps a tree of children to the debug output.

Calls C++ function: void QObject::dumpObjectTree() const.

C++ documentation:

Dumps a tree of children to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectInfo().

pub unsafe fn dynamic_property_names(&self) -> CppBox<QListOfQByteArray>

Returns the names of all properties that were dynamically added to the object using setProperty().

Calls C++ function: QList<QByteArray> QObject::dynamicPropertyNames() const.

C++ documentation:

Returns the names of all properties that were dynamically added to the object using setProperty().

This function was introduced in Qt 4.2.

pub unsafe fn eq(&self, p: impl CastInto<Ref<QPointerOfQObject>>) -> bool

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

Calls C++ function: bool operator==(QObject* o, const QPointer<QObject>& p).

Warning: no exact match found in C++ documentation. Below is the C++ documentation for bool operator==(QChar c1, QChar c2):

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

pub unsafe fn event(&self, event: impl CastInto<Ptr<QEvent>>) -> bool

This virtual function receives events to an object and should return true if the event e was recognized and processed.

Calls C++ function: virtual bool QObject::event(QEvent* event).

C++ documentation:

This virtual function receives events to an object and should return true if the event e was recognized and processed.

The event() function can be reimplemented to customize the behavior of an object.

Make sure you call the parent event class implementation for all the events you did not handle.

Example:

class MyClass : public QWidget
{
      Q_OBJECT
public:
      MyClass(QWidget *parent = 0);
      ~MyClass();
      bool event(QEvent* ev)
      {
          if (ev->type() == QEvent::PolishRequest) {
              // overwrite handling of PolishRequest if any
              doThings();
              return true;
          } else  if (ev->type() == QEvent::Show) {
              // complement handling of Show if any
              doThings2();
              QWidget::event(ev);
              return true;
          }
          // Make sure the rest of events are handled
          return QWidget::event(ev);
      }
};

See also installEventFilter(), timerEvent(), QCoreApplication::sendEvent(), and QCoreApplication::postEvent().

pub unsafe fn event_filter( &self, watched: impl CastInto<Ptr<QObject>>, event: impl CastInto<Ptr<QEvent>>, ) -> bool

Filters events if this object has been installed as an event filter for the watched object.

Calls C++ function: virtual bool QObject::eventFilter(QObject* watched, QEvent* event).

C++ documentation:

Filters events if this object has been installed as an event filter for the watched object.

In your reimplementation of this function, if you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false.

Example:

class MainWindow : public QMainWindow
{
public:
      MainWindow();
protected:
      bool eventFilter(QObject obj, QEvent ev);
private:
      QTextEdit *textEdit;
};
MainWindow::MainWindow()
{
      textEdit = new QTextEdit;
      setCentralWidget(textEdit);
      textEdit->installEventFilter(this);
}
bool MainWindow::eventFilter(QObject obj, QEvent event)
{
      if (obj == textEdit) {
          if (event->type() == QEvent::KeyPress) {
              QKeyEvent keyEvent = static_cast<QKeyEvent>(event);
              qDebug() << “Ate key press” << keyEvent->key();
              return true;
          } else {
              return false;
          }
      } else {
          // pass the event on to the parent class
          return QMainWindow::eventFilter(obj, event);
      }
}

Notice in the example above that unhandled events are passed to the base class's eventFilter() function, since the base class might have reimplemented eventFilter() for its own internal purposes.

Warning: If you delete the receiver object in this function, be sure to return true. Otherwise, Qt will forward the event to the deleted object and the program might crash.

See also installEventFilter().

pub unsafe fn find_child_q_object_2a( &self, a_name: impl CastInto<Ref<QString>>, options: QFlags<FindChildOption>, ) -> QPtr<QObject>

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QObject* QObject::findChild<QObject*>(const QString& aName = …, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned. In that case, findChildren() should be used.

This example returns a child QPushButton of parentWidget named "button1", even if the button isn't a direct child of the parent:

QPushButton button = parentWidget->findChild<QPushButton >(“button1”);

This example returns a QListWidget child of parentWidget:

QListWidget list = parentWidget->findChild<QListWidget >();

This example returns a child QPushButton of parentWidget (its direct parent) named "button1":

QPushButton button = parentWidget->findChild<QPushButton >(“button1”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_child_q_object_1a( &self, a_name: impl CastInto<Ref<QString>>, ) -> QPtr<QObject>

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QObject* QObject::findChild<QObject*>(const QString& aName = …) const.

C++ documentation:

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned. In that case, findChildren() should be used.

This example returns a child QPushButton of parentWidget named "button1", even if the button isn't a direct child of the parent:

QPushButton button = parentWidget->findChild<QPushButton >(“button1”);

This example returns a QListWidget child of parentWidget:

QListWidget list = parentWidget->findChild<QListWidget >();

This example returns a child QPushButton of parentWidget (its direct parent) named "button1":

QPushButton button = parentWidget->findChild<QPushButton >(“button1”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_child_q_object_0a(&self) -> QPtr<QObject>

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QObject* QObject::findChild<QObject*>() const.

C++ documentation:

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned. In that case, findChildren() should be used.

This example returns a child QPushButton of parentWidget named "button1", even if the button isn't a direct child of the parent:

QPushButton button = parentWidget->findChild<QPushButton >(“button1”);

This example returns a QListWidget child of parentWidget:

QListWidget list = parentWidget->findChild<QListWidget >();

This example returns a child QPushButton of parentWidget (its direct parent) named "button1":

QPushButton button = parentWidget->findChild<QPushButton >(“button1”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_children_q_object_q_string_q_flags_find_child_option( &self, a_name: impl CastInto<Ref<QString>>, options: QFlags<FindChildOption>, ) -> CppBox<QListOfQObject>

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QString& aName = …, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

The following example shows how to find a list of child QWidgets of the specified parentWidget named widgetname:

QList<QWidget > widgets = parentWidget.findChildren<QWidget >(“widgetname”);

This example returns all QPushButtons that are children of parentWidget:

QList<QPushButton > allPButtons = parentWidget.findChildren<QPushButton >();

This example returns all QPushButtons that are immediate children of parentWidget:

QList<QPushButton > childButtons = parentWidget.findChildren<QPushButton >(QString(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object_q_reg_exp_q_flags_find_child_option( &self, re: impl CastInto<Ref<QRegExp>>, options: QFlags<FindChildOption>, ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegExp& re, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

This function overloads findChildren().

Returns the children of this object that can be cast to type T and that have names matching the regular expression regExp, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

pub unsafe fn find_children_q_object_q_regular_expression_q_flags_find_child_option( &self, re: impl CastInto<Ref<QRegularExpression>>, options: QFlags<FindChildOption>, ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegularExpression& re, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

This function overloads findChildren().

Returns the children of this object that can be cast to type T and that have names matching the regular expression re, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

This function was introduced in Qt 5.0.

pub unsafe fn find_children_q_object_q_string( &self, a_name: impl CastInto<Ref<QString>>, ) -> CppBox<QListOfQObject>

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QString& aName = …) const.

C++ documentation:

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

The following example shows how to find a list of child QWidgets of the specified parentWidget named widgetname:

QList<QWidget > widgets = parentWidget.findChildren<QWidget >(“widgetname”);

This example returns all QPushButtons that are children of parentWidget:

QList<QPushButton > allPButtons = parentWidget.findChildren<QPushButton >();

This example returns all QPushButtons that are immediate children of parentWidget:

QList<QPushButton > childButtons = parentWidget.findChildren<QPushButton >(QString(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object(&self) -> CppBox<QListOfQObject>

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>() const.

C++ documentation:

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

The following example shows how to find a list of child QWidgets of the specified parentWidget named widgetname:

QList<QWidget > widgets = parentWidget.findChildren<QWidget >(“widgetname”);

This example returns all QPushButtons that are children of parentWidget:

QList<QPushButton > allPButtons = parentWidget.findChildren<QPushButton >();

This example returns all QPushButtons that are immediate children of parentWidget:

QList<QPushButton > childButtons = parentWidget.findChildren<QPushButton >(QString(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object_q_reg_exp( &self, re: impl CastInto<Ref<QRegExp>>, ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegExp& re) const.

C++ documentation:

This function overloads findChildren().

Returns the children of this object that can be cast to type T and that have names matching the regular expression regExp, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

pub unsafe fn find_children_q_object_q_regular_expression( &self, re: impl CastInto<Ref<QRegularExpression>>, ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegularExpression& re) const.

C++ documentation:

This function overloads findChildren().

Returns the children of this object that can be cast to type T and that have names matching the regular expression re, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

This function was introduced in Qt 5.0.

pub unsafe fn inherits(&self, classname: *const i8) -> bool

Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.

Calls C++ function: bool QObject::inherits(const char* classname) const.

C++ documentation:

Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.

A class is considered to inherit itself.

Example:

QTimer *timer = new QTimer;         // QTimer inherits QObject
timer->inherits(“QTimer”);          // returns true
timer->inherits(“QObject”);         // returns true
timer->inherits(“QAbstractButton”); // returns false
// QVBoxLayout inherits QObject and QLayoutItem
QVBoxLayout *layout = new QVBoxLayout;
layout->inherits(“QObject”);        // returns true
layout->inherits(“QLayoutItem”);    // returns true (even though QLayoutItem is not a QObject)

If you need to determine whether an object is an instance of a particular class for the purpose of casting it, consider using qobject_cast<Type *>(object) instead.

See also metaObject() and qobject_cast().

pub unsafe fn install_event_filter( &self, filter_obj: impl CastInto<Ptr<QObject>>, )

Installs an event filter filterObj on this object. For example:

Calls C++ function: void QObject::installEventFilter(QObject* filterObj).

C++ documentation:

Installs an event filter filterObj on this object. For example:

  monitoredObj->installEventFilter(filterObj);

An event filter is an object that receives all events that are sent to this object. The filter can either stop the event or forward it to this object. The event filter filterObj receives events via its eventFilter() function. The eventFilter() function must return true if the event should be filtered, (i.e. stopped); otherwise it must return false.

If multiple event filters are installed on a single object, the filter that was installed last is activated first.

Here's a KeyPressEater class that eats the key presses of its monitored objects:

class KeyPressEater : public QObject
{
      Q_OBJECT
      ...
protected:
      bool eventFilter(QObject obj, QEvent event);
};
bool KeyPressEater::eventFilter(QObject obj, QEvent event)
{
      if (event->type() == QEvent::KeyPress) {
          QKeyEvent keyEvent = static_cast<QKeyEvent >(event);
          qDebug(“Ate key press %d”, keyEvent->key());
          return true;
      } else {
          // standard event processing
          return QObject::eventFilter(obj, event);
      }
}

And here's how to install it on two widgets:

KeyPressEater keyPressEater = new KeyPressEater(this);
QPushButton pushButton = new QPushButton(this);
QListView *listView = new QListView(this);
pushButton->installEventFilter(keyPressEater);
listView->installEventFilter(keyPressEater);

The QShortcut class, for example, uses this technique to intercept shortcut key presses.

Warning: If you delete the receiver object in your eventFilter() function, be sure to return true. If you return false, Qt sends the event to the deleted object and the program will crash.

Note that the filtering object must be in the same thread as this object. If filterObj is in a different thread, this function does nothing. If either filterObj or this object are moved to a different thread after calling this function, the event filter will not be called until both objects have the same thread affinity again (it is not removed).

See also removeEventFilter(), eventFilter(), and event().

pub unsafe fn is_widget_type(&self) -> bool

Returns true if the object is a widget; otherwise returns false.

Calls C++ function: bool QObject::isWidgetType() const.

C++ documentation:

Returns true if the object is a widget; otherwise returns false.

Calling this function is equivalent to calling inherits("QWidget"), except that it is much faster.

pub unsafe fn is_window_type(&self) -> bool

Returns true if the object is a window; otherwise returns false.

Calls C++ function: bool QObject::isWindowType() const.

C++ documentation:

Returns true if the object is a window; otherwise returns false.

Calling this function is equivalent to calling inherits("QWindow"), except that it is much faster.

pub unsafe fn kill_timer(&self, id: i32)

Kills the timer with timer identifier, id.

Calls C++ function: void QObject::killTimer(int id).

C++ documentation:

Kills the timer with timer identifier, id.

The timer identifier is returned by startTimer() when a timer event is started.

See also timerEvent() and startTimer().

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Returns a pointer to the meta-object of this object.

Calls C++ function: virtual const QMetaObject* QObject::metaObject() const.

C++ documentation:

Returns a pointer to the meta-object of this object.

A meta-object contains information about a class that inherits QObject, e.g. class name, superclass name, properties, signals and slots. Every QObject subclass that contains the Q_OBJECT macro will have a meta-object.

The meta-object information is required by the signal/slot connection mechanism and the property system. The inherits() function also makes use of the meta-object.

If you have no pointer to an actual object instance but still want to access the meta-object of a class, you can use staticMetaObject.

Example:

QObject *obj = new QPushButton;
obj->metaObject()->className();             // returns “QPushButton”
QPushButton::staticMetaObject.className();  // returns “QPushButton”

See also staticMetaObject.

pub unsafe fn move_to_thread(&self, thread: impl CastInto<Ptr<QThread>>)

Changes the thread affinity for this object and its children. The object cannot be moved if it has a parent. Event processing will continue in the targetThread.

Calls C++ function: void QObject::moveToThread(QThread* thread).

C++ documentation:

Changes the thread affinity for this object and its children. The object cannot be moved if it has a parent. Event processing will continue in the targetThread.

To move an object to the main thread, use QApplication::instance() to retrieve a pointer to the current application, and then use QApplication::thread() to retrieve the thread in which the application lives. For example:

myObject->moveToThread(QApplication::instance()->thread());

If targetThread is zero, all event processing for this object and its children stops.

Note that all active timers for the object will be reset. The timers are first stopped in the current thread and restarted (with the same interval) in the targetThread. As a result, constantly moving an object between threads can postpone timer events indefinitely.

A QEvent::ThreadChange event is sent to this object just before the thread affinity is changed. You can handle this event to perform any special processing. Note that any new events that are posted to this object will be handled in the targetThread.

Warning: This function is not thread-safe; the current thread must be same as the current thread affinity. In other words, this function can only "push" an object from the current thread to another thread, it cannot "pull" an object from any arbitrary thread to the current thread.

See also thread().

pub unsafe fn object_name(&self) -> CppBox<QString>

This property holds the name of this object

Calls C++ function: QString QObject::objectName() const.

C++ documentation:

This property holds the name of this object

You can find an object by name (and type) using findChild(). You can find a set of objects with findChildren().

qDebug(“MyClass::setPrecision(): (%s) invalid precision %f”,
         qPrintable(objectName()), newPrecision);

By default, this property contains an empty string.

Access functions:

QString	objectName() const
void	setObjectName(const QString &name)

Notifier signal:

void

objectNameChanged(const QString &objectName)

[see note below]

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also metaObject() and QMetaObject::className().

pub unsafe fn parent(&self) -> QPtr<QObject>

Returns a pointer to the parent object.

Calls C++ function: QObject* QObject::parent() const.

C++ documentation:

Returns a pointer to the parent object.

See also setParent() and children().

pub unsafe fn property(&self, name: *const i8) -> CppBox<QVariant>

Returns the value of the object's name property.

Calls C++ function: QVariant QObject::property(const char* name) const.

C++ documentation:

Returns the value of the object’s name property.

If no such property exists, the returned variant is invalid.

Information about all available properties is provided through the metaObject() and dynamicPropertyNames().

See also setProperty(), QVariant::isValid(), metaObject(), and dynamicPropertyNames().

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: i32, arg3: *mut *mut c_void, ) -> i32

Calls C++ function: virtual int QObject::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const i8) -> *mut c_void

Calls C++ function: virtual void* QObject::qt_metacast(const char* arg1).

pub unsafe fn remove_event_filter(&self, obj: impl CastInto<Ptr<QObject>>)

Removes an event filter object obj from this object. The request is ignored if such an event filter has not been installed.

Calls C++ function: void QObject::removeEventFilter(QObject* obj).

C++ documentation:

Removes an event filter object obj from this object. The request is ignored if such an event filter has not been installed.

All event filters for this object are automatically removed when this object is destroyed.

It is always safe to remove an event filter, even during event filter activation (i.e. from the eventFilter() function).

See also installEventFilter(), eventFilter(), and event().

pub unsafe fn set_object_name(&self, name: impl CastInto<Ref<QString>>)

This property holds the name of this object

Calls C++ function: void QObject::setObjectName(const QString& name).

C++ documentation:

This property holds the name of this object

You can find an object by name (and type) using findChild(). You can find a set of objects with findChildren().

qDebug(“MyClass::setPrecision(): (%s) invalid precision %f”,
         qPrintable(objectName()), newPrecision);

By default, this property contains an empty string.

Access functions:

QString	objectName() const
void	setObjectName(const QString &name)

Notifier signal:

void

objectNameChanged(const QString &objectName)

[see note below]

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also metaObject() and QMetaObject::className().

pub unsafe fn set_parent(&self, parent: impl CastInto<Ptr<QObject>>)

Makes the object a child of parent.

Calls C++ function: void QObject::setParent(QObject* parent).

C++ documentation:

Makes the object a child of parent.

See also parent() and children().

pub unsafe fn set_property( &self, name: *const i8, value: impl CastInto<Ref<QVariant>>, ) -> bool

Sets the value of the object's name property to value.

Calls C++ function: bool QObject::setProperty(const char* name, const QVariant& value).

C++ documentation:

Sets the value of the object’s name property to value.

If the property is defined in the class using Q_PROPERTY then true is returned on success and false otherwise. If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned.

Information about all available properties is provided through the metaObject() and dynamicPropertyNames().

Dynamic properties can be queried again using property() and can be removed by setting the property value to an invalid QVariant. Changing the value of a dynamic property causes a QDynamicPropertyChangeEvent to be sent to the object.

Note: Dynamic properties starting with "_q_" are reserved for internal purposes.

See also property(), metaObject(), dynamicPropertyNames(), and QMetaProperty::write().

pub unsafe fn signals_blocked(&self) -> bool

Returns true if signals are blocked; otherwise returns false.

Calls C++ function: bool QObject::signalsBlocked() const.

C++ documentation:

Returns true if signals are blocked; otherwise returns false.

Signals are not blocked by default.

See also blockSignals() and QSignalBlocker.

pub unsafe fn start_timer_2a(&self, interval: i32, timer_type: TimerType) -> i32

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

Calls C++ function: int QObject::startTimer(int interval, Qt::TimerType timerType = …).

C++ documentation:

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

A timer event will occur every interval milliseconds until killTimer() is called. If interval is 0, then the timer event occurs once every time there are no more window system events to process.

The virtual timerEvent() function is called with the QTimerEvent event parameter class when a timer event occurs. Reimplement this function to get timer events.

If multiple timers are running, the QTimerEvent::timerId() can be used to find out which timer was activated.

Example:

class MyObject : public QObject
{
      Q_OBJECT
public:
      MyObject(QObject *parent = 0);
protected:
      void timerEvent(QTimerEvent *event);
};
MyObject::MyObject(QObject *parent)
      : QObject(parent)
{
      startTimer(50);     // 50-millisecond timer
      startTimer(1000);   // 1-second timer
      startTimer(60000);  // 1-minute timer
      using namespace std::chrono;
      startTimer(milliseconds(50));
      startTimer(seconds(1));
      startTimer(minutes(1));
      // since C++14 we can use std::chrono::duration literals, e.g.:
      startTimer(100ms);
      startTimer(5s);
      startTimer(2min);
      startTimer(1h);
}
void MyObject::timerEvent(QTimerEvent *event)
{
      qDebug() << “Timer ID:” << event->timerId();
}

Note that QTimer's accuracy depends on the underlying operating system and hardware. The timerType argument allows you to customize the accuracy of the timer. See Qt::TimerType for information on the different timer types. Most platforms support an accuracy of 20 milliseconds; some provide more. If Qt is unable to deliver the requested number of timer events, it will silently discard some.

The QTimer class provides a high-level programming interface with single-shot timers and timer signals instead of events. There is also a QBasicTimer class that is more lightweight than QTimer and less clumsy than using timer IDs directly.

See also timerEvent(), killTimer(), and QTimer::singleShot().

pub unsafe fn start_timer_1a(&self, interval: i32) -> i32

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

Calls C++ function: int QObject::startTimer(int interval).

C++ documentation:

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

A timer event will occur every interval milliseconds until killTimer() is called. If interval is 0, then the timer event occurs once every time there are no more window system events to process.

The virtual timerEvent() function is called with the QTimerEvent event parameter class when a timer event occurs. Reimplement this function to get timer events.

If multiple timers are running, the QTimerEvent::timerId() can be used to find out which timer was activated.

Example:

class MyObject : public QObject
{
      Q_OBJECT
public:
      MyObject(QObject *parent = 0);
protected:
      void timerEvent(QTimerEvent *event);
};
MyObject::MyObject(QObject *parent)
      : QObject(parent)
{
      startTimer(50);     // 50-millisecond timer
      startTimer(1000);   // 1-second timer
      startTimer(60000);  // 1-minute timer
      using namespace std::chrono;
      startTimer(milliseconds(50));
      startTimer(seconds(1));
      startTimer(minutes(1));
      // since C++14 we can use std::chrono::duration literals, e.g.:
      startTimer(100ms);
      startTimer(5s);
      startTimer(2min);
      startTimer(1h);
}
void MyObject::timerEvent(QTimerEvent *event)
{
      qDebug() << “Timer ID:” << event->timerId();
}

Note that QTimer's accuracy depends on the underlying operating system and hardware. The timerType argument allows you to customize the accuracy of the timer. See Qt::TimerType for information on the different timer types. Most platforms support an accuracy of 20 milliseconds; some provide more. If Qt is unable to deliver the requested number of timer events, it will silently discard some.

The QTimer class provides a high-level programming interface with single-shot timers and timer signals instead of events. There is also a QBasicTimer class that is more lightweight than QTimer and less clumsy than using timer IDs directly.

See also timerEvent(), killTimer(), and QTimer::singleShot().

pub unsafe fn thread(&self) -> QPtr<QThread>

Returns the thread in which the object lives.

Calls C++ function: QThread* QObject::thread() const.

C++ documentation:

Returns the thread in which the object lives.

See also moveToThread().

Trait Implementations

impl CppDeletable for QGridLayout

unsafe fn delete(&self)

Destroys the grid layout. Geometry management is terminated if this is a top-level grid.

Calls C++ function: virtual [destructor] void QGridLayout::~QGridLayout().

C++ documentation:

Destroys the grid layout. Geometry management is terminated if this is a top-level grid.

The layout's widgets aren't destroyed.

impl Deref for QGridLayout

fn deref(&self) -> &QLayout

Calls C++ function: QLayout* static_cast<QLayout*>(QGridLayout* ptr).

type Target = QLayout

The resulting type after dereferencing.

impl DynamicCast<QGridLayout> for QLayout

unsafe fn dynamic_cast(ptr: Ptr<QLayout>) -> Ptr<QGridLayout>

Calls C++ function: QGridLayout* dynamic_cast<QGridLayout*>(QLayout* ptr).

impl DynamicCast<QGridLayout> for QLayoutItem

unsafe fn dynamic_cast(ptr: Ptr<QLayoutItem>) -> Ptr<QGridLayout>

Calls C++ function: QGridLayout* dynamic_cast<QGridLayout*>(QLayoutItem* ptr).

impl DynamicCast<QGridLayout> for QObject

unsafe fn dynamic_cast(ptr: Ptr<QObject>) -> Ptr<QGridLayout>

Calls C++ function: QGridLayout* dynamic_cast<QGridLayout*>(QObject* ptr).

impl StaticDowncast<QGridLayout> for QLayout

unsafe fn static_downcast(ptr: Ptr<QLayout>) -> Ptr<QGridLayout>

Calls C++ function: QGridLayout* static_cast<QGridLayout*>(QLayout* ptr).

impl StaticDowncast<QGridLayout> for QLayoutItem

unsafe fn static_downcast(ptr: Ptr<QLayoutItem>) -> Ptr<QGridLayout>

Calls C++ function: QGridLayout* static_cast<QGridLayout*>(QLayoutItem* ptr).

impl StaticDowncast<QGridLayout> for QObject

unsafe fn static_downcast(ptr: Ptr<QObject>) -> Ptr<QGridLayout>

Calls C++ function: QGridLayout* static_cast<QGridLayout*>(QObject* ptr).

impl StaticUpcast<QLayout> for QGridLayout

unsafe fn static_upcast(ptr: Ptr<QGridLayout>) -> Ptr<QLayout>

Calls C++ function: QLayout* static_cast<QLayout*>(QGridLayout* ptr).

impl StaticUpcast<QLayoutItem> for QGridLayout

unsafe fn static_upcast(ptr: Ptr<QGridLayout>) -> Ptr<QLayoutItem>

Calls C++ function: QLayoutItem* static_cast<QLayoutItem*>(QGridLayout* ptr).

impl StaticUpcast<QObject> for QGridLayout

unsafe fn static_upcast(ptr: Ptr<QGridLayout>) -> Ptr<QObject>

Calls C++ function: QObject* static_cast<QObject*>(QGridLayout* ptr).