BasicListUI
, MultiListUI
public abstract class ListUI extends ComponentUI
JList
pluggable look and feel delegate.Modifier | Constructor | Description |
---|---|---|
protected |
Constructor for subclasses to call. |
Modifier and Type | Method | Description |
---|---|---|
abstract Rectangle |
getCellBounds |
Returns the bounding rectangle, in the given list's coordinate system, for the range of cells specified by the two indices. |
abstract Point |
indexToLocation |
Returns the origin in the given JList , of the specified item, in the list's coordinate system. |
abstract int |
locationToIndex |
Returns the cell index in the specified JList closest to the given location in the list's coordinate system. |
contains, createUI, getAccessibleChild, getAccessibleChildrenCount, getBaseline, getBaselineResizeBehavior, getMaximumSize, getMinimumSize, getPreferredSize, installUI, paint, uninstallUI, update
protected ListUI()
public abstract int locationToIndex(JList<?> list, Point location)
JList
closest to the given location in the list's coordinate system. To determine if the cell actually contains the specified location, compare the point against the cell's bounds, as provided by getCellBounds
. This method returns -1
if the list's model is empty.list
- the listlocation
- the coordinates of the point-1
NullPointerException
- if location
is nullpublic abstract Point indexToLocation(JList<?> list, int index)
JList
, of the specified item, in the list's coordinate system. Returns null
if the index isn't valid.list
- the listindex
- the cell indexnull
public abstract Rectangle getCellBounds(JList<?> list, int index1, int index2)
If the smaller index is outside the list's range of cells, this method returns null
. If the smaller index is valid, but the larger index is outside the list's range, the bounds of just the first index is returned. Otherwise, the bounds of the valid range is returned.
list
- the listindex1
- the first index in the rangeindex2
- the second index in the rangenull
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/plaf/ListUI.html