33 /** 34 * The {@code JList} pluggable look and feel delegate. 35 * 36 * @author Hans Muller 37 */ 38 39 public abstract class ListUI extends ComponentUI 40 { 41 /** 42 * Returns the cell index in the specified {@code JList} closest to the 43 * given location in the list's coordinate system. To determine if the 44 * cell actually contains the specified location, compare the point against 45 * the cell's bounds, as provided by {@code getCellBounds}. 46 * This method returns {@code -1} if the list's model is empty. 47 * 48 * @param list the list 49 * @param location the coordinates of the point 50 * @return the cell index closest to the given location, or {@code -1} 51 * @throws NullPointerException if {@code location} is null 52 */ 53 public abstract int locationToIndex(JList list, Point location); 54 55 56 /** 57 * Returns the origin in the given {@code JList}, of the specified item, 58 * in the list's coordinate system. 59 * Returns {@code null} if the index isn't valid. 60 * 61 * @param list the list 62 * @param index the cell index 63 * @return the origin of the cell, or {@code null} 64 */ 65 public abstract Point indexToLocation(JList list, int index); 66 67 68 /** 69 * Returns the bounding rectangle, in the given list's coordinate system, 70 * for the range of cells specified by the two indices. 71 * The indices can be supplied in any order. 72 * <p> 73 * If the smaller index is outside the list's range of cells, this method 74 * returns {@code null}. If the smaller index is valid, but the larger 75 * index is outside the list's range, the bounds of just the first index 76 * is returned. Otherwise, the bounds of the valid range is returned. 77 * 78 * @param list the list 79 * @param index1 the first index in the range 80 * @param index2 the second index in the range 81 * @return the bounding rectangle for the range of cells, or {@code null} 82 */ 83 public abstract Rectangle getCellBounds(JList list, int index1, int index2); 84 } | 33 /** 34 * The {@code JList} pluggable look and feel delegate. 35 * 36 * @author Hans Muller 37 */ 38 39 public abstract class ListUI extends ComponentUI 40 { 41 /** 42 * Returns the cell index in the specified {@code JList} closest to the 43 * given location in the list's coordinate system. To determine if the 44 * cell actually contains the specified location, compare the point against 45 * the cell's bounds, as provided by {@code getCellBounds}. 46 * This method returns {@code -1} if the list's model is empty. 47 * 48 * @param list the list 49 * @param location the coordinates of the point 50 * @return the cell index closest to the given location, or {@code -1} 51 * @throws NullPointerException if {@code location} is null 52 */ 53 public abstract int locationToIndex(JList<?> list, Point location); 54 55 56 /** 57 * Returns the origin in the given {@code JList}, of the specified item, 58 * in the list's coordinate system. 59 * Returns {@code null} if the index isn't valid. 60 * 61 * @param list the list 62 * @param index the cell index 63 * @return the origin of the cell, or {@code null} 64 */ 65 public abstract Point indexToLocation(JList<?> list, int index); 66 67 68 /** 69 * Returns the bounding rectangle, in the given list's coordinate system, 70 * for the range of cells specified by the two indices. 71 * The indices can be supplied in any order. 72 * <p> 73 * If the smaller index is outside the list's range of cells, this method 74 * returns {@code null}. If the smaller index is valid, but the larger 75 * index is outside the list's range, the bounds of just the first index 76 * is returned. Otherwise, the bounds of the valid range is returned. 77 * 78 * @param list the list 79 * @param index1 the first index in the range 80 * @param index2 the second index in the range 81 * @return the bounding rectangle for the range of cells, or {@code null} 82 */ 83 public abstract Rectangle getCellBounds(JList<?> list, int index1, int index2); 84 } |