Module java.desktop

Class ListUI

Direct Known Subclasses:
BasicListUI, MultiListUI

public abstract class ListUI
extends ComponentUI
The JList pluggable look and feel delegate.
  • Constructor Details

  • Method Details

    • locationToIndex

      public abstract int locationToIndex​(JList<?> list, Point location)
      Returns the cell index in the specified 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 list
      location - the coordinates of the point
      the cell index closest to the given location, or -1
      NullPointerException - if location is null
    • indexToLocation

      public abstract Point indexToLocation​(JList<?> list, int index)
      Returns the origin in the given JList, of the specified item, in the list's coordinate system. Returns null if the index isn't valid.
      list - the list
      index - the cell index
      the origin of the cell, or null
    • getCellBounds

      public abstract Rectangle getCellBounds​(JList<?> list, int index1, int index2)
      Returns the bounding rectangle, in the given list's coordinate system, for the range of cells specified by the two indices. The indices can be supplied in any order.

      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 list
      index1 - the first index in the range
      index2 - the second index in the range
      the bounding rectangle for the range of cells, or null