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java.lang.Objectjava.lang.Enum<QGraphicsScene.ItemIndexMethod>
com.trolltech.qt.gui.QGraphicsScene.ItemIndexMethod
public static enum QGraphicsScene.ItemIndexMethod
This enum describes the indexing algorithms QGraphicsScene provides for managing positional information about items on the scene.
Enum Constant Summary | |
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BspTreeIndex
A Binary Space Partitioning tree is applied. |
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NoIndex
No index is applied. |
Method Summary | |
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static QGraphicsScene.ItemIndexMethod |
resolve(int value)
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int |
value()
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static QGraphicsScene.ItemIndexMethod |
valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name. |
static QGraphicsScene.ItemIndexMethod[] |
values()
Returns an array containing the constants of this enum type, in the order they're declared. |
Methods inherited from class java.lang.Enum |
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clone, compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf |
Methods inherited from class java.lang.Object |
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finalize, getClass, notify, notifyAll, wait, wait, wait |
Enum Constant Detail |
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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).
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 |
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public static final QGraphicsScene.ItemIndexMethod[] values()
for(QGraphicsScene.ItemIndexMethod c : QGraphicsScene.ItemIndexMethod.values()) System.out.println(c);
public static QGraphicsScene.ItemIndexMethod valueOf(java.lang.String name)
name
- the name of the enum constant to be returned.
java.lang.IllegalArgumentException
- if this enum type has no constant
with the specified namepublic int value()
value
in interface QtEnumerator
public static QGraphicsScene.ItemIndexMethod resolve(int value)
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