QPaintEngineState Class
The QPaintEngineState class provides information about the active paint engine's current state. More...
| Header: | #include <QPaintEngineState> |
| qmake: | QT += gui |
| Since: | Qt 4.1 |
Note: All functions in this class are reentrant.
Public Functions
| QBrush | backgroundBrush() const |
| Qt::BGMode | backgroundMode() const |
| QBrush | brush() const |
| bool | brushNeedsResolving() const |
| QPointF | brushOrigin() const |
| Qt::ClipOperation | clipOperation() const |
| QPainterPath | clipPath() const |
| QRegion | clipRegion() const |
| QPainter::CompositionMode | compositionMode() const |
| QFont | font() const |
| bool | isClipEnabled() const |
| qreal | opacity() const |
| QPainter * | painter() const |
| QPen | pen() const |
| bool | penNeedsResolving() const |
| QPainter::RenderHints | renderHints() const |
| QPaintEngine::DirtyFlags | state() const |
| QTransform | transform() const |
Detailed Description
The QPaintEngineState class provides information about the active paint engine's current state.
QPaintEngineState records which properties that have changed since the last time the paint engine was updated, as well as their current value.
Which properties that have changed can at any time be retrieved using the state() function. This function returns an instance of the QPaintEngine::DirtyFlags type which stores an OR combination of QPaintEngine::DirtyFlag values. The QPaintEngine::DirtyFlag enum defines whether a property has changed since the last update or not.
If a property is marked with a dirty flag, its current value can be retrieved using the corresponding get function:
The QPaintEngineState class also provide the painter() function which returns a pointer to the painter that is currently updating the paint engine.
An instance of this class, representing the current state of the active paint engine, is passed as argument to the QPaintEngine::updateState() function. The only situation in which you will have to use this class directly is when implementing your own paint engine.
See also QPaintEngine.
Member Function Documentation
QBrush QPaintEngineState::backgroundBrush() const
Returns the background brush in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyBackground flag.
See also state() and QPaintEngine::updateState().
Qt::BGMode QPaintEngineState::backgroundMode() const
Returns the background mode in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyBackgroundMode flag.
See also state() and QPaintEngine::updateState().
QBrush QPaintEngineState::brush() const
Returns the brush in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyBrush flag.
See also state() and QPaintEngine::updateState().
bool QPaintEngineState::brushNeedsResolving() const
Returns whether the coordinate of the fill have been specified as bounded by the current rendering operation and have to be resolved (about the currently rendered primitive).
This function was introduced in Qt 4.3.
QPointF QPaintEngineState::brushOrigin() const
Returns the brush origin in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyBrushOrigin flag.
See also state() and QPaintEngine::updateState().
Qt::ClipOperation QPaintEngineState::clipOperation() const
Returns the clip operation in the current paint engine state.
This variable should only be used when the state() returns a combination which includes either the QPaintEngine::DirtyClipPath or the QPaintEngine::DirtyClipRegion flag.
See also state() and QPaintEngine::updateState().
QPainterPath QPaintEngineState::clipPath() const
Returns the clip path in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyClipPath flag.
See also state() and QPaintEngine::updateState().
QRegion QPaintEngineState::clipRegion() const
Returns the clip region in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyClipRegion flag.
See also state() and QPaintEngine::updateState().
QPainter::CompositionMode QPaintEngineState::compositionMode() const
Returns the composition mode in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyCompositionMode flag.
See also state() and QPaintEngine::updateState().
QFont QPaintEngineState::font() const
Returns the font in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyFont flag.
See also state() and QPaintEngine::updateState().
bool QPaintEngineState::isClipEnabled() const
Returns whether clipping is enabled or not in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyClipEnabled flag.
See also state() and QPaintEngine::updateState().
qreal QPaintEngineState::opacity() const
Returns the opacity in the current paint engine state.
This function was introduced in Qt 4.2.
QPainter * QPaintEngineState::painter() const
Returns a pointer to the painter currently updating the paint engine.
QPen QPaintEngineState::pen() const
Returns the pen in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyPen flag.
See also state() and QPaintEngine::updateState().
bool QPaintEngineState::penNeedsResolving() const
Returns whether the coordinate of the stroke have been specified as bounded by the current rendering operation and have to be resolved (about the currently rendered primitive).
This function was introduced in Qt 4.3.
QPainter::RenderHints QPaintEngineState::renderHints() const
Returns the render hints in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyHints flag.
See also state() and QPaintEngine::updateState().
QPaintEngine::DirtyFlags QPaintEngineState::state() const
Returns a combination of flags identifying the set of properties that need to be updated when updating the paint engine's state (i.e. during a call to the QPaintEngine::updateState() function).
See also QPaintEngine::updateState().
QTransform QPaintEngineState::transform() const
Returns the matrix in the current paint engine state.
This variable should only be used when the state() returns a combination which includes the QPaintEngine::DirtyTransform flag.
This function was introduced in Qt 4.3.
See also state() and QPaintEngine::updateState().
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