Struct qt_widgets::q_graphics_view::OptimizationFlag

#[repr(transparent)]
pub struct OptimizationFlag(_);

This enum describes flags that you can enable to improve rendering performance in QGraphicsView. By default, none of these flags are set. Note that setting a flag usually imposes a side effect, and this effect can vary between paint devices and platforms.

C++ enum: QGraphicsView::OptimizationFlag.

C++ documentation:

This enum describes flags that you can enable to improve rendering performance in QGraphicsView. By default, none of these flags are set. Note that setting a flag usually imposes a side effect, and this effect can vary between paint devices and platforms.

This enum was introduced or modified in Qt 4.3.

The OptimizationFlags type is a typedef for QFlags<OptimizationFlag>. It stores an OR combination of OptimizationFlag values.

Methods

impl OptimizationFlag

pub fn to_int(&self) -> c_int

impl OptimizationFlag

pub const DontClipPainter: OptimizationFlag

This value is obsolete and has no effect. (C++ enum variant: DontClipPainter = 1)

pub const DontSavePainterState: OptimizationFlag

When rendering, QGraphicsView protects the painter state (see QPainter::save()) when rendering the background or foreground, and when rendering each item. This allows you to leave the painter in an altered state (i.e., you can call QPainter::setPen() or QPainter::setBrush() without restoring the state after painting). However, if the items consistently do restore the state, you should enable this flag to prevent QGraphicsView from doing the same. (C++ enum variant: DontSavePainterState = 2)

pub const DontAdjustForAntialiasing: OptimizationFlag

Disables QGraphicsView's antialiasing auto-adjustment of exposed areas. Items that render antialiased lines on the boundaries of their QGraphicsItem::boundingRect() can end up rendering parts of the line outside. To prevent rendering artifacts, QGraphicsView expands all exposed regions by 2 pixels in all directions. If you enable this flag, QGraphicsView will no longer perform these adjustments, minimizing the areas that require redrawing, which improves performance. A common side effect is that items that do draw with antialiasing can leave painting traces behind on the scene as they are moved. (C++ enum variant: DontAdjustForAntialiasing = 4)

pub const IndirectPainting: OptimizationFlag

Since Qt 4.6, restore the old painting algorithm that calls QGraphicsView::drawItems() and QGraphicsScene::drawItems(). To be used only for compatibility with old code. (C++ enum variant: IndirectPainting = 8)

Trait Implementations

impl<T: Into<QFlags<OptimizationFlag>>> BitOr<T> for OptimizationFlag

type Output = QFlags<OptimizationFlag>

The resulting type after applying the | operator.

fn bitor(self, rhs: T) -> QFlags<OptimizationFlag>

Performs the | operation.

impl Clone for OptimizationFlag

fn clone(&self) -> OptimizationFlag

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for OptimizationFlag

impl Debug for OptimizationFlag

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Eq for OptimizationFlag

impl From<OptimizationFlag> for c_int

fn from(value: OptimizationFlag) -> Self

Performs the conversion.

impl From<OptimizationFlag> for QFlags<OptimizationFlag>

fn from(value: OptimizationFlag) -> Self

Performs the conversion.

impl From<i32> for OptimizationFlag

fn from(value: c_int) -> Self

Performs the conversion.

impl PartialEq<OptimizationFlag> for OptimizationFlag

fn eq(&self, other: &OptimizationFlag) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &OptimizationFlag) -> bool

This method tests for !=.

impl StructuralEq for OptimizationFlag

impl StructuralPartialEq for OptimizationFlag