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Posted By

s1w on 09/28/11


Tagged

performance swing graphics Trick Rate win7 flickering aero repaint


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Resizing Swing in Win7+Aero (trick to minimalize flickering)

 / Published in: Java
 

This trick improves repaint rate in Win7+Aero: setting resizable to null, and providing own resize hook. Its aint perfect, but still alot better.. check my example:

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  1. /*
  2.  * resizing swing trick in Win7+Aero demo
  3.  * @author: s1w_ /pj`s3826
  4. */
  5. import java.awt.event.*;
  6. import java.awt.*;
  7. import javax.swing.event.*;
  8. import javax.swing.*;
  9.  
  10. class ResizeHookDemo extends JDialog {
  11.   private final static int width = 580, height = 350;
  12.   private final JFileChooser fc;
  13.   private java.awt.geom.GeneralPath gp;
  14.  
  15.   public ResizeHookDemo() {
  16.     super((JDialog)null, "Choose File", true);
  17.  
  18.     fc = new JFileChooser() {
  19.  
  20.      @Override
  21.      public void paint(Graphics g) {
  22.        super.paint(g);
  23.        int w = getWidth();
  24.        int h = getHeight();
  25.        g.setColor(new Color(150, 150, 150, 200));
  26.        g.drawLine(w-7, h, w, h-7);
  27.        g.drawLine(w-11, h, w, h-11);
  28.        g.drawLine(w-15, h, w, h-15);
  29.  
  30.        gp = new java.awt.geom.GeneralPath();      
  31.        gp.moveTo(w-17, h);
  32.        gp.lineTo(w, h-17);
  33.        gp.lineTo(w, h);
  34.        gp.closePath();
  35.      }
  36.  
  37.     };
  38.     fc.addActionListener(new ActionListener() {
  39.  
  40.       public void actionPerformed(ActionEvent e) {
  41.         if (e.getActionCommand().equals("CancelSelection")) {
  42.           setVisible(false);
  43.           // action...
  44.         }
  45.         else if (e.getActionCommand().equals("ApproveSelection")) {
  46.           setVisible(false);
  47.           // action...
  48.         }
  49.       }
  50.     });
  51.  
  52.     MouseInputListener resizeHook = new MouseInputAdapter() {
  53.       private Point startPos = null;
  54.  
  55.       public void mousePressed(MouseEvent e) {
  56.         if (gp.contains(e.getPoint())) 
  57.           startPos = new Point(getWidth()-e.getX(), getHeight()-e.getY());
  58.       }
  59.  
  60.       public void mouseReleased(MouseEvent mouseEvent) {
  61.         startPos = null;
  62.       }
  63.  
  64.       public void mouseMoved(MouseEvent e) {
  65.         if (gp.contains(e.getPoint()))
  66.           setCursor(Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR));
  67.         else
  68.           setCursor(Cursor.getDefaultCursor());
  69.       }
  70.  
  71.       public void mouseDragged(MouseEvent e) {
  72.         if (startPos != null) {
  73.  
  74.           int dx = e.getX() + startPos.x;
  75.           int dy = e.getY() + startPos.y;
  76.  
  77.           setSize(dx, dy);
  78.           repaint();
  79.         }
  80.       }         
  81.     };
  82.  
  83.     fc.addMouseMotionListener(resizeHook);
  84.     fc.addMouseListener(resizeHook);
  85.     fc.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 20));
  86.     add(fc);
  87.  
  88.     setResizable(false);
  89.  
  90.     setMinimumSize(new Dimension(width, height));
  91.     setDefaultCloseOperation(HIDE_ON_CLOSE);
  92.     setLocationRelativeTo(null);
  93.   }
  94.  
  95.   public static void main(String args[]) {
  96.     System.out.println("Starting demo...");
  97.     SwingUtilities.invokeLater(new Runnable() {
  98.  
  99.       @Override
  100.       public void run() {
  101.         new ResizeHookDemo().setVisible(true);
  102.       }
  103.     });
  104.   }
  105. }

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