Struct rute::auto::layout_item::LayoutItem

pub struct LayoutItem<'a> { /* private fields */ }

Notice these docs are heavy WIP and not very relevent yet

This is used by custom layouts.

Pure virtual functions are provided to return information about the layout, including, sizeHint(), minimumSize(), maximumSize() and expanding().

The layout’s geometry can be set and retrieved with setGeometry() and geometry(), and its alignment with setAlignment() and alignment().

isEmpty() returns whether the layout item is empty. If the concrete item is a QWidget, it can be retrieved using widget(). Similarly for layout() and spacerItem().

Some layouts have width and height interdependencies. These can be expressed using hasHeightForWidth(), heightForWidth(), and minimumHeightForWidth(). For more explanation see the Qt Quarterly article Trading Height for Width

See also: Layout

Licence

The documentation is an adoption of the original Qt Documentation and provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation.

Implementations

impl<'a> LayoutItem<'a>

pub fn size_hint(&self) -> Size<'_>

Implemented in subclasses to return the preferred size of this item.

pub fn minimum_size(&self) -> Size<'_>

Implemented in subclasses to return the minimum size of this item.

pub fn maximum_size(&self) -> Size<'_>

Implemented in subclasses to return the maximum size of this item.

pub fn expanding_directions(&self) -> Orientations

Returns whether this layout item 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.

pub fn is_empty(&self) -> bool

Implemented in subclasses to return whether this item is empty, i.e. whether it contains any widgets.

pub fn has_height_for_width(&self) -> bool

Returns true if this layout’s preferred height depends on its width; otherwise returns false. The default implementation returns false.

Reimplement this function in layout managers that support height for width.

See also: [height_for_width()] Widget::height_for_width

pub fn height_for_width(&self, arg0: i32) -> i32

Returns the preferred height for this layout item, given the width, which is not used in this default implementation.

The default implementation returns -1, indicating that the preferred height is independent of the width of the item. Using the function hasHeightForWidth() will typically be much faster than calling this function and testing for -1.

Reimplement this function in layout managers that support height for width. A typical implementation will look like this:

Caching is strongly recommended; without it layout will take exponential time.

See also: [has_height_for_width()]

pub fn minimum_height_for_width(&self, arg0: i32) -> i32

Returns the minimum height this widget needs for the given width, w. The default implementation simply returns heightForWidth( w).

pub fn invalidate(&self) -> &Self

Invalidates any cached information in this layout item.

pub fn widget(&self) -> Option<Widget<'_>>

If this item manages a QWidget, returns that widget. Otherwise, nullptr is returned.

Note: While the functions layout() and spacerItem() perform casts, this function returns another object: QLayout and QSpacerItem inherit QLayoutItem, while QWidget does not.

See also: [layout()] [spacer_item()]

pub fn layout(&self) -> Option<Layout<'_>>

If this item is a QLayout, it is returned as a QLayout; otherwise 0 is returned. This function provides type-safe casting.

See also: [spacer_item()] [widget()]

pub fn spacer_item(&self) -> Option<SpacerItem<'_>>

If this item is a QSpacerItem, it is returned as a QSpacerItem; otherwise 0 is returned. This function provides type-safe casting.

See also: [layout()] [widget()]

pub fn alignment(&self) -> Alignment

Returns the alignment of this item.

pub fn set_alignment(&self, a: Alignment) -> &Self

Sets the alignment of this item to alignment.

Note: Item alignment is only supported by QLayoutItem subclasses where it would have a visual effect. Except for QSpacerItem, which provides blank space for layouts, all public Qt classes that inherit QLayoutItem support item alignment.

Trait Implementations

impl<'a> Clone for LayoutItem<'a>

fn clone(&self) -> LayoutItem<'a>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> LayoutItemTrait<'a> for LayoutItem<'a>