JTable


1   package org.objectweb.jac.aspects.gui.swing;
2   
3   import java.awt.Component  ;
4   import javax.swing.event.TableModelEvent  ;
5   import javax.swing.table.TableCellRenderer  ;
6   import org.apache.log4j.Logger;
7   
8   /**
9    * A table with variable height rows. The height of a row is the
10   * maximum preferred height of its cells.
11   */
12  public class JTable extends javax.swing.JTable   {
13      static Logger logger = Logger.getLogger("gui.swing");
14  
15      /**
16       * Recompute row height on tableChanged events
17       */
18      public void tableChanged(TableModelEvent   e) {
19          super.tableChanged(e);
20          setPreferredRowHeights(1);
21      }
22  
23      /**
24       * Compute preferred height of all rows
25       * @param margin margin in pixels to add at the top and bottom of
26       * each row
27       */
28      public void setPreferredRowHeights(int margin) {
29          for (int row=0; row<getRowCount(); row++) {
30              setPreferredRowHeight(row,margin);
31          }
32      }
33  
34      /**
35       * Compute the preferred height of a row
36       * @param row row index
37       * @param margin margin in pixels to add at the top and bottom of
38       * the row
39       */
40      public void setPreferredRowHeight(int row, int margin) {
41          // Get the current default height for all rows
42          int height = getRowHeight();
43        
44          // Determine highest cell in the row
45          for (int col=0; col<getColumnCount(); col++) {
46              try {
47                  TableCellRenderer   renderer = getCellRenderer(row,col);
48                  if (renderer!=null) {
49                      Component   comp = prepareRenderer(renderer,row,col);
50                      if (comp!=null) {
51                          comp.validate();
52                          int h = comp.getPreferredSize().height + 2*margin;
53                          height = Math.max(height,h);
54                      }
55                  }
56              } catch (Exception   e) {
57                  logger.error("Failed to compute cell height for ("+row+","+col+")",e);
58              }
59          }
60          setRowHeight(row,height);
61      }
62  
63      public Component   prepareRenderer(TableCellRenderer   renderer, int row, int column) {
64          try {
65              return super.prepareRenderer(renderer,row,column);
66          } catch (Exception   e) {
67              logger.error("Caught exception in prepareRenderer("+row+","+column+")",e);
68              return null;
69          }
70      }
71  }
72
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