UIUtil


1   package org.objectstyle.cayenne.modeler.util;
2   
3   import java.awt.Rectangle  ;
4   
5   import javax.swing.JTable  ;
6   import javax.swing.JViewport  ;
7   
8   /**
9    * @author Andrei Adamchik
10   * @since 1.1
11   */
12  public class UIUtil {
13  
14      /**
15       * Scrolls table within JViewport to the selected row if there is one.
16       */
17      public static void scrollToSelectedRow(JTable   table) {
18          int row = table.getSelectedRow();
19          if (row >= 0) {
20              scroll(table, row, 0);
21          }
22      }
23  
24      /**
25      * Scrolls view if it is located in a JViewport, so that the specified cell
26      * is displayed in the center.
27      */
28      public static void scroll(JTable   table, int rowIndex, int vColIndex) {
29          if (!(table.getParent() instanceof JViewport  )) {
30              return;
31          }
32  
33          JViewport   viewport = (JViewport  ) table.getParent();
34          Rectangle   rect = table.getCellRect(rowIndex, vColIndex, true);
35          Rectangle   viewRect = viewport.getViewRect();
36  
37          if (viewRect.intersects(rect)) {
38              return;
39          }
40  
41          // Translate the cell location so that it is relative
42          // to the view, assuming the northwest corner of the
43          // view is (0,0).
44          rect.setLocation(rect.x - viewRect.x, rect.y - viewRect.y);
45  
46          // Calculate location of rect if it were at the center of view
47          int centerX = (viewRect.width - rect.width) / 2;
48          int centerY = (viewRect.height - rect.height) / 2;
49  
50          // Fake the location of the cell so that scrollRectToVisible
51          // will move the cell to the center
52          if (rect.x < centerX) {
53              centerX = -centerX;
54          }
55          if (rect.y < centerY) {
56              centerY = -centerY;
57          }
58          rect.translate(centerX, centerY);
59  
60          // Scroll the area into view.
61          viewport.scrollRectToVisible(rect);
62      }
63  }
64
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