在JScrollPane的速度很慢滾動使用每個像素的透明度

Question

我使用使用AWTUtilities.setWindowOpaque()上JFrame每個像素的透明度，包含JScrollPane時。當透明度打開時，該窗格中的滾動非常緩慢且不穩定，而不是。在Windows 7和JDK 6上試用。

public class MainFrame extends JFrame { 
    super(); 

    setUndecorated(true); 
    AWTUtilities.setWindowOpaque(this, false); //this turns JScrollPane inside of this JFrame slow and laggy 
} 

有沒有人發佈過？謝謝！

Answer 1

我看不到任何滾動問題，也可以創建基於良好的揮杆規則代碼的測試場景中，這個代碼是相當難成的處理器和GPU，的Java6，Win7的64B

從代碼

import com.sun.awt.AWTUtilities; 
import java.awt.*; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.image.BufferedImage; 
import javax.swing.*; 
import javax.swing.event.ChangeEvent; 
import javax.swing.event.ChangeListener; 
import javax.swing.table.TableModel; 

public class ViewPortFlickeringOriginal { 

    private JFrame frame = new JFrame("Table"); 
    private JViewport viewport = new JViewport(); 
    private Rectangle RECT = new Rectangle(); 
    private Rectangle RECT1 = new Rectangle(); 
    private JTable table = new JTable(50, 3); 
    private javax.swing.Timer timer; 
    private int count = 0; 
    private GradientViewPortOriginal tableViewPort; 
    private static boolean loggerOpacity; 
    private JPanel panel = new JPanel(); 
    private static JButton button; 

    public ViewPortFlickeringOriginal() { 
     tableViewPort = new GradientViewPortOriginal(table); 
     viewport = tableViewPort.getViewport(); 
     viewport.addChangeListener(new ChangeListener() { 

      @Override 
      public void stateChanged(ChangeEvent e) { 
       if (tableViewPort.bolStart) { 
        RECT = table.getCellRect(0, 0, true); 
        RECT1 = table.getCellRect(table.getRowCount() - 1, 0, true); 
        Rectangle viewRect = viewport.getViewRect(); 
        if (viewRect.intersects(RECT)) { 
         System.out.println("Visible RECT -> " + RECT); 
         tableViewPort.paintBackGround(new Color(250, 150, 150)); 
        } else if (viewRect.intersects(RECT1)) { 
         System.out.println("Visible RECT1 -> " + RECT1); 
         tableViewPort.paintBackGround(new Color(150, 250, 150)); 
        } else { 
         System.out.println("Visible RECT1 -> ???? "); 
         tableViewPort.paintBackGround(new Color(150, 150, 250)); 
        } 
       } 
      } 
     }); 
     frame.add(tableViewPort); 
     button = new JButton("Change Opacity for Java6/Win7"); 
     button.setBounds(100, 100, 50, 50); 
     button.setVisible(true); 
     panel.add(button); 
     loggerOpacity = true; 
     button.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent evt) { 
       Object src = evt.getSource(); 
       if (src == button && loggerOpacity) { 
        AWTUtilities.setWindowOpacity(frame, 0.80f); 
       } 
      } 
     }); 
     frame.add(panel, BorderLayout.SOUTH); 
     frame.setPreferredSize(new Dimension(600, 300)); 
     frame.pack(); 
     frame.setLocation(50, 100); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     RepaintManager.setCurrentManager(new RepaintManager() { 

      @Override 
      public void addDirtyRegion(JComponent c, int x, int y, int w, int h) { 
       Container con = c.getParent(); 
       while (con instanceof JComponent) { 
        if (!con.isVisible()) { 
         return; 
        } 
        if (con instanceof GradientViewPortOriginal) { 
         c = (JComponent) con; 
         x = 0; 
         y = 0; 
         w = con.getWidth(); 
         h = con.getHeight(); 
        } 
        con = con.getParent(); 
       } 
       super.addDirtyRegion(c, x, y, w, h); 
      } 
     }); 
     frame.setVisible(true); 
     start(); 
    } 

    private void start() { 
     timer = new javax.swing.Timer(100, updateCol()); 
     timer.start(); 
    } 

    public Action updateCol() { 
     return new AbstractAction("text load action") { 

      private static final long serialVersionUID = 1L; 

      @Override 
      public void actionPerformed(ActionEvent e) { 

       System.out.println("updating row " + (count + 1)); 
       TableModel model = table.getModel(); 
       int cols = model.getColumnCount(); 
       int row = 0; 
       for (int j = 0; j < cols; j++) { 
        row = count; 
        table.changeSelection(row, 0, false, false); 
        timer.setDelay(100); 
        Object value = "row " + (count + 1) + " item " + (j + 1); 
        model.setValueAt(value, count, j); 
       } 
       count++; 
       if (count >= table.getRowCount()) { 
        timer.stop(); 
        table.changeSelection(0, 0, false, false); 
        java.awt.EventQueue.invokeLater(new Runnable() { 

         @Override 
         public void run() { 
          table.clearSelection(); 
          tableViewPort.bolStart = true; 
         } 
        }); 
       } 
      } 
     }; 
    } 

    public static void main(String[] args) { 
     java.awt.EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       ViewPortFlickeringOriginal viewPortFlickering = new ViewPortFlickeringOriginal(); 
      } 
     }); 
    } 
} 

class GradientViewPortOriginal extends JScrollPane { 

    private static final long serialVersionUID = 1L; 
    private final int h = 50; 
    private BufferedImage img = null; 
    private BufferedImage shadow = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB); 
    private JViewport viewPort; 
    public boolean bolStart = false; 

    public GradientViewPortOriginal(JComponent com) { 
     super(com); 
     viewPort = this.getViewport(); 
     viewPort.setScrollMode(JViewport.BLIT_SCROLL_MODE); 
     viewPort.setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE); 
     viewPort.setScrollMode(JViewport.SIMPLE_SCROLL_MODE); 
     paintBackGround(new Color(250, 150, 150)); 
    } 

    public void paintBackGround(Color g) { 
     Graphics2D g2 = shadow.createGraphics(); 
     g2.setPaint(g); 
     g2.fillRect(0, 0, 1, h); 
     g2.setComposite(AlphaComposite.DstIn); 
     g2.setPaint(new GradientPaint(0, 0, new Color(0, 0, 0, 0f), 0, h, 
       new Color(0.1f, 0.8f, 0.8f, 0.5f))); 
     g2.fillRect(0, 0, 1, h); 
     g2.dispose(); 
    } 

    @Override 
    public void paint(Graphics g) { 
     if (img == null || img.getWidth() != getWidth() || img.getHeight() != getHeight()) { 
      img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB); 
     } 
     Graphics2D g2 = img.createGraphics(); 
     super.paint(g2); 
     Rectangle bounds = getViewport().getVisibleRect(); 
     g2.scale(bounds.getWidth(), -1); 
     int y = (getColumnHeader() == null) ? 0 : getColumnHeader().getHeight(); 
     g2.drawImage(shadow, bounds.x, -bounds.y - y - h, null); 
     g2.scale(1, -1); 
     g2.drawImage(shadow, bounds.x, bounds.y + bounds.height - h + y, null); 
     g2.dispose(); 
     g.drawImage(img, 0, 0, null); 
    } 
} 

，但我能證明懶滾動JScrollPane的含有他人JComponents的是JTable的JList的或者或JTextArea的或JTextPan Ë

import java.awt.Color; 
import java.awt.Component; 
import java.awt.GridLayout; 
import java.awt.event.AdjustmentEvent; 
import java.awt.event.AdjustmentListener; 
import javax.swing.*; 

public class ListPanel extends JFrame { 

    private static final long serialVersionUID = 1L; 

    public ListPanel() { 
     setLayout(new GridLayout(0, 2, 10, 10)); 
     DefaultListModel model = new DefaultListModel(); 
     model.addElement(createButtons("one")); 
     model.addElement(createButtons("two")); 
     model.addElement(createButtons("three")); 
     model.addElement(createButtons("four")); 
     model.addElement(createButtons("five")); 
     model.addElement(createButtons("six")); 
     model.addElement(createButtons("seven")); 
     model.addElement(createButtons("eight")); 
     model.addElement(createButtons("nine")); 
     model.addElement(createButtons("ten")); 
     model.addElement(createButtons("eleven")); 
     model.addElement(createButtons("twelwe")); 
     JList list = new JList(model); 
     list.setCellRenderer(new PanelRenderer()); 
     JScrollPane scroll1 = new JScrollPane(list); 
     final JScrollBar scrollBar = scroll1.getVerticalScrollBar(); 
     scrollBar.addAdjustmentListener(new AdjustmentListener() { 

      @Override 
      public void adjustmentValueChanged(AdjustmentEvent e) { 
       System.out.println("JScrollBar's current value = " + scrollBar.getValue()); 
      } 
     }); 
     add(scroll1); 
     JScrollPane scroll2 = new JScrollPane(createPanel()); 
     add(scroll2);   
     final JScrollBar scrollBar1 = scroll2.getVerticalScrollBar(); 
     scrollBar1.addAdjustmentListener(new AdjustmentListener() { 

      @Override 
      public void adjustmentValueChanged(AdjustmentEvent e) { 
       System.out.println("JScrollBar's current value = " + scrollBar1.getValue()); 
      } 
     }); 

    } 

    public static JPanel createPanel() { 
     JPanel panel = new JPanel(); 
     panel.setLayout(new GridLayout(0, 1, 1, 1)); 
     panel.add(createButtons("one")); 
     panel.add(createButtons("two")); 
     panel.add(createButtons("three")); 
     panel.add(createButtons("four")); 
     panel.add(createButtons("five")); 
     panel.add(createButtons("six")); 
     panel.add(createButtons("seven")); 
     panel.add(createButtons("eight")); 
     panel.add(createButtons("nine")); 
     panel.add(createButtons("ten")); 
     panel.add(createButtons("eleven")); 
     panel.add(createButtons("twelwe")); 
     return panel; 
    } 

    public static JButton createButtons(String text) { 
     JButton button = new JButton(text); 
     return button; 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       ListPanel frame = new ListPanel(); 
       frame.setDefaultCloseOperation(EXIT_ON_CLOSE); 
       //frame.pack(); 
       frame.setSize(270, 200); 
       frame.setVisible(true); 
      } 
     }); 
    } 

    class PanelRenderer implements ListCellRenderer { 

     @Override 
     public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { 
      JButton renderer = (JButton) value; 
      renderer.setBackground(isSelected ? Color.red : list.getBackground()); 
      return renderer; 
     } 
    } 
}