ListUI (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Ed. 5.0

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javax.swing.plaf
Class ListUI

java.lang.Object
  javax.swing.plaf.ComponentUI
      javax.swing.plaf.ListUI

Direct Known Subclasses:: BasicListUI, MultiListUI

public abstract class ListUI
extends ComponentUI
extends ComponentUI

The JList pluggable look and feel delegate. This interface adds methods that allow the JList component to map locations, e.g. mouse coordinates, to list cells and from cell indices to the bounds of the cell.

Constructor Summary

ListUI()


Method Summary

abstract Rectangle getCellBounds(JList list, int index1, int index2)
          Returns the bounds of the specified item in JList coordinates, null if index isn't valid.

abstract Point indexToLocation(JList list, int index)
          Returns the origin of the specified item in JList coordinates, null if index isn't valid.

abstract int locationToIndex(JList list, Point location)
          Convert a point in JList coordinates to the closest index of the cell at that location.

Methods inherited from class javax.swing.plaf.ComponentUI

contains, createUI, getAccessibleChild, getAccessibleChildrenCount, getMaximumSize, getMinimumSize, getPreferredSize, installUI, paint, uninstallUI, update

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Summary
`ListUI()`

Method Summary
`abstract Rectangle`	`getCellBounds(JList list, int index1, int index2)` Returns the bounds of the specified item in JList coordinates, null if index isn't valid.
`abstract Point`	`indexToLocation(JList list, int index)` Returns the origin of the specified item in JList coordinates, null if index isn't valid.
`abstract int`	`locationToIndex(JList list, Point location)` Convert a point in `JList` coordinates to the closest index of the cell at that location.

Methods inherited from class javax.swing.plaf.ComponentUI
`contains, createUI, getAccessibleChild, getAccessibleChildrenCount, getMaximumSize, getMinimumSize, getPreferredSize, installUI, paint, uninstallUI, update`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

ListUI

public ListUI()

Method Detail

locationToIndex

public abstract int locationToIndex(JList list,
                                    Point location)

Convert a point in JList coordinates to the closest index of the cell at that location. To determine if the cell actually contains the specified location use a combination of this method and getCellBounds. Returns -1 if the model is empty.

Parameters:: location - The JList relative coordinates of the cell
Returns:: The index of the cell at location, or -1.

indexToLocation

public abstract Point indexToLocation(JList list,
                                      int index)

Returns the origin of the specified item in JList coordinates, null if index isn't valid.

Parameters:: index - The index of the JList cell.
Returns:: The origin of the index'th cell.

getCellBounds

public abstract Rectangle getCellBounds(JList list,
                                        int index1,
                                        int index2)

Returns the bounds of the specified item in JList coordinates, null if index isn't valid.

Parameters:: index - The index of the JList cell.
Returns:: The bounds of the index'th cell.