com.trolltech.qt.gui
Class QGraphicsItem.CacheMode

java.lang.Object
  extended by java.lang.Enum
      extended by com.trolltech.qt.gui.QGraphicsItem.CacheMode
All Implemented Interfaces:
QtEnumerator, java.io.Serializable, java.lang.Comparable
Enclosing class:
QGraphicsItem

public static final class QGraphicsItem.CacheMode
extends java.lang.Enum
implements QtEnumerator

This enum describes QGraphicsItem's cache modes. Caching is used to speed up rendering by allocating and rendering to an off-screen pixel buffer, which can be reused when the item requires redrawing. For some paint devices, the cache is stored directly in graphics memory, which makes rendering very quick.

See also:
QGraphicsItem::setCacheMode().

See Also:
Serialized Form

Field Summary
static QGraphicsItem.CacheMode DeviceCoordinateCache
          Caching is enabled at the paint device level, in device coordinates.
static QGraphicsItem.CacheMode ItemCoordinateCache
          Caching is enabled for the item's logical (local) coordinate system.
static QGraphicsItem.CacheMode NoCache
          The default; all item caching is disabled.
 
Method Summary
static QGraphicsItem.CacheMode resolve(int value)
          Returns the QGraphicsItem$CacheMode constant with the specified int.
 int value()
          This function should return an integer value for the enum values of the enumeration that implements this interface.
static QGraphicsItem.CacheMode valueOf(java.lang.String name)
           
static QGraphicsItem.CacheMode[] values()
           
 
Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

NoCache

public static final QGraphicsItem.CacheMode NoCache
The default; all item caching is disabled. QGraphicsItem::paint() is called every time the item needs redrawing.


ItemCoordinateCache

public static final QGraphicsItem.CacheMode ItemCoordinateCache
Caching is enabled for the item's logical (local) coordinate system. QGraphicsItem creates an off-screen pixel buffer with a configurable size / resolution that you can pass to QGraphicsItem::setCacheMode(). Rendering quality will typically degrade, depending on the resolution of the cache and the item transformation. The first time the item is redrawn, it will render itself into the cache, and the cache is then reused for every subsequent expose. The cache is also reused as the item is transformed. To adjust the resolution of the cache, you can call setCacheMode() again.


DeviceCoordinateCache

public static final QGraphicsItem.CacheMode DeviceCoordinateCache
Caching is enabled at the paint device level, in device coordinates. This mode is for items that can move, but are not rotated, scaled or sheared. If the item is transformed directly or indirectly, the cache will be regenerated automatically. Unlike ItemCoordinateCacheMode, DeviceCoordinateCache always renders at maximum quality.

Method Detail

values

public static QGraphicsItem.CacheMode[] values()

valueOf

public static QGraphicsItem.CacheMode valueOf(java.lang.String name)

value

public int value()
This function should return an integer value for the enum values of the enumeration that implements this interface.

Specified by:
value in interface QtEnumerator

resolve

public static QGraphicsItem.CacheMode resolve(int value)
Returns the QGraphicsItem$CacheMode constant with the specified int.