com.trolltech.qt.gui
Class QStyleOptionGraphicsItem

java.lang.Object
  extended by com.trolltech.qt.internal.QSignalEmitterInternal
      extended by com.trolltech.qt.QSignalEmitter
          extended by com.trolltech.qt.QtJambiObject
              extended by com.trolltech.qt.gui.QStyleOption
                  extended by com.trolltech.qt.gui.QStyleOptionGraphicsItem
All Implemented Interfaces:
QtJambiInterface, java.lang.Cloneable

public class QStyleOptionGraphicsItem
extends QStyleOption
implements java.lang.Cloneable

The QStyleOptionGraphicsItem class is used to describe the parameters needed to draw a QGraphicsItem. For performance reasons, the access to the member variables is direct (i.e., using the . or -> operator). This low-level feel makes the structures straightforward to use and emphasizes that these are simply parameters.

For an example demonstrating how style options can be used, see the Styles example.

See also:
QStyleOption, and QGraphicsItem::paint().


Nested Class Summary
static class QStyleOptionGraphicsItem.StyleOptionType
          This enum is used to hold information about the type of the style option, and is defined for each QStyleOption subclass.
static class QStyleOptionGraphicsItem.StyleOptionVersion
          This enum is used to hold information about the version of the style option, and is defined for each QStyleOption subclass.
 
Nested classes/interfaces inherited from class com.trolltech.qt.gui.QStyleOption
QStyleOption.OptionType
 
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
QSignalEmitter.AbstractSignal, QSignalEmitter.PrivateSignal0, QSignalEmitter.PrivateSignal1, QSignalEmitter.PrivateSignal2, QSignalEmitter.PrivateSignal3, QSignalEmitter.PrivateSignal4, QSignalEmitter.PrivateSignal5, QSignalEmitter.PrivateSignal6, QSignalEmitter.PrivateSignal7, QSignalEmitter.PrivateSignal8, QSignalEmitter.PrivateSignal9, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9
 
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal
 
Field Summary
 
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
currentSender
 
Constructor Summary
QStyleOptionGraphicsItem()
          Constructs a QStyleOptionGraphicsItem.
QStyleOptionGraphicsItem(QStyleOptionGraphicsItem other)
          Constructs a copy of other.
 
Method Summary
 QStyleOptionGraphicsItem clone()
          This method is reimplemented for internal reasons
 QRectF exposedRect()
          This variable holds the exposed rectangle, in item coordinates.
 double levelOfDetail()
          This variable holds a simple metric for determining an item's level of detail.
 QMatrix matrix()
          This variable holds the complete transformation matrix for the item.
 void setExposedRect(QRectF exposedRect)
          This variable holds the exposed rectangle, in item coordinates.
 void setLevelOfDetail(double levelOfDetail)
          This variable holds a simple metric for determining an item's level of detail.
 void setMatrix(QMatrix matrix)
          This variable holds the complete transformation matrix for the item.
 
Methods inherited from class com.trolltech.qt.gui.QStyleOption
direction, fontMetrics, initFrom, palette, rect, setDirection, setFontMetrics, setPalette, setRect, setState, setState, setType, setVersion, state, type, version
 
Methods inherited from class com.trolltech.qt.QtJambiObject
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr
 
Methods inherited from class com.trolltech.qt.QSignalEmitter
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread
 
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
__qt_signalInitialization
 
Methods inherited from class java.lang.Object
getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface com.trolltech.qt.QtJambiInterface
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership
 

Constructor Detail

QStyleOptionGraphicsItem

public QStyleOptionGraphicsItem()
Constructs a QStyleOptionGraphicsItem. The levelOfDetail parameter is initialized to 1.


QStyleOptionGraphicsItem

public QStyleOptionGraphicsItem(QStyleOptionGraphicsItem other)
Constructs a copy of other.

Method Detail

setExposedRect

public final void setExposedRect(QRectF exposedRect)
This variable holds the exposed rectangle, in item coordinates. Make use of this rectangle to speed up item drawing when only parts of the item are exposed. If the whole item is exposed, this rectangle will be the same as QGraphicsItem::boundingRect().


exposedRect

public final QRectF exposedRect()
This variable holds the exposed rectangle, in item coordinates. Make use of this rectangle to speed up item drawing when only parts of the item are exposed. If the whole item is exposed, this rectangle will be the same as QGraphicsItem::boundingRect().


setMatrix

public final void setMatrix(QMatrix matrix)
This variable holds the complete transformation matrix for the item. This matrix is the sum of the item's scene matrix and the matrix of the painter used for drawing the item. It is provided for convenience, allowing anvanced level-of-detail metrics that can be used to speed up item drawing.

To find the dimentions of an item in screen coordinates (i.e., pixels), you can use the mapping functions of QMatrix, such as QMatrix::map().

See also:
QStyleOptionGraphicsItem::levelOfDetail.


matrix

public final QMatrix matrix()
This variable holds the complete transformation matrix for the item. This matrix is the sum of the item's scene matrix and the matrix of the painter used for drawing the item. It is provided for convenience, allowing anvanced level-of-detail metrics that can be used to speed up item drawing.

To find the dimentions of an item in screen coordinates (i.e., pixels), you can use the mapping functions of QMatrix, such as QMatrix::map().

See also:
QStyleOptionGraphicsItem::levelOfDetail.


setLevelOfDetail

public final void setLevelOfDetail(double levelOfDetail)
This variable holds a simple metric for determining an item's level of detail. This simple metric provides an easy way to determine the level of detail for an item. Its value represents the maximum value of the height and width of a unity rectangle, mapped using the complete transformation matrix of the painter used to draw the item. By default, if no transformations are applied, its value is 1. If zoomed out 1:2, the level of detail will be 0.5, and if zoomed in 2:1, its value is 2.

For more advanced level-of-detail metrics, use QStyleOptionGraphicsItem::matrix directly.

See also:
QStyleOptionGraphicsItem::matrix.


levelOfDetail

public final double levelOfDetail()
This variable holds a simple metric for determining an item's level of detail. This simple metric provides an easy way to determine the level of detail for an item. Its value represents the maximum value of the height and width of a unity rectangle, mapped using the complete transformation matrix of the painter used to draw the item. By default, if no transformations are applied, its value is 1. If zoomed out 1:2, the level of detail will be 0.5, and if zoomed in 2:1, its value is 2.

For more advanced level-of-detail metrics, use QStyleOptionGraphicsItem::matrix directly.

See also:
QStyleOptionGraphicsItem::matrix.


clone

public QStyleOptionGraphicsItem clone()
This method is reimplemented for internal reasons

Overrides:
clone in class QStyleOption