com.trolltech.qt.gui
Class QGraphicsScene.ItemIndexMethod

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

public static final class QGraphicsScene.ItemIndexMethod
extends java.lang.Enum
implements QtEnumerator

This enum describes the indexing algorithms QGraphicsScene provides for managing positional information about items on the scene.

See also:
setItemIndexMethod(), and bspTreeDepth.

See Also:
Serialized Form

Field Summary
static QGraphicsScene.ItemIndexMethod BspTreeIndex
          A Binary Space Partitioning tree is applied.
static QGraphicsScene.ItemIndexMethod NoIndex
          No index is applied.
 
Method Summary
static QGraphicsScene.ItemIndexMethod resolve(int value)
          Returns the QGraphicsScene$ItemIndexMethod 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 QGraphicsScene.ItemIndexMethod valueOf(java.lang.String name)
           
static QGraphicsScene.ItemIndexMethod[] 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

BspTreeIndex

public static final QGraphicsScene.ItemIndexMethod BspTreeIndex
A Binary Space Partitioning tree is applied. All QGraphicsScene's item location algorithms are of an order close to logarithmic complexity, by making use of binary search. Adding, moving and removing items is logarithmic. This approach is best for static scenes (i.e., scenes where most items do not move).


NoIndex

public static final QGraphicsScene.ItemIndexMethod NoIndex
No index is applied. Item location is of linear complexity, as all items on the scene are searched. Adding, moving and removing items, however, is done in constant time. This approach is ideal for dynamic scenes, where many items are added, moved or removed continuously.

Method Detail

values

public static QGraphicsScene.ItemIndexMethod[] values()

valueOf

public static QGraphicsScene.ItemIndexMethod 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 QGraphicsScene.ItemIndexMethod resolve(int value)
Returns the QGraphicsScene$ItemIndexMethod constant with the specified int.