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Java Class File  |  1998-11-05  |  1.6 KB  |  48 lines

  1. package javax.swing.text;
  2.  
  3. import java.awt.Component;
  4. import java.awt.Point;
  5. import java.awt.Rectangle;
  6. import java.awt.event.ActionEvent;
  7. import javax.swing.JComponent;
  8.  
  9. class DefaultEditorKit$PageDownAction extends TextAction {
  10.    DefaultEditorKit$PageDownAction() {
  11.       super("page-down");
  12.    }
  13.  
  14.    public void actionPerformed(ActionEvent var1) {
  15.       JTextComponent var2 = ((TextAction)this).getTextComponent(var1);
  16.       if (var2 != null) {
  17.          Rectangle var5 = new Rectangle();
  18.          ((JComponent)var2).computeVisibleRect(var5);
  19.          int var3 = var5.y;
  20.          var5.y += var5.height;
  21.          if (var5.y + var5.height > ((JComponent)var2).getHeight()) {
  22.             var5.y = ((JComponent)var2).getHeight() - var5.height;
  23.          }
  24.  
  25.          var3 = var5.y - var3;
  26.          ((JComponent)var2).scrollRectToVisible(var5);
  27.          int var4 = var2.getCaretPosition();
  28.  
  29.          try {
  30.             if (var4 != -1) {
  31.                Rectangle var6 = var2.modelToView(var4);
  32.                var6.y += var3;
  33.                var4 = var2.viewToModel(new Point(var6.x, var6.y));
  34.                Document var7 = var2.getDocument();
  35.                if (var4 > var7.getLength() - 1) {
  36.                   var4 = var7.getLength() - 1;
  37.                }
  38.  
  39.                var2.setCaretPosition(var4);
  40.             }
  41.          } catch (BadLocationException var8) {
  42.             ((Component)var2).getToolkit().beep();
  43.          }
  44.       }
  45.  
  46.    }
  47. }
  48.