Java 透明和不规则 Swing 窗口

历史

SetWindowRgn

JFrame

java.awt.Robot

Robot

Consumer JRE

java.awt

javax.swing

com.sun.awt.AWTUtilities

AWTUtilities

类

com.sun.awt.AWTUtilities

AWTUtilities.setWindowOpacity(Window, float)

AWTUtilities.setWindowShape(Window, Shape)

AWTUtilities.setWindowOpaque(Window, boolean)

工具提示

Robot

AWTUtilities

public class TranslucentPopupFactory extends PopupFactory {
   @Override
   public Popup getPopup(Component owner, Component contents, int x, int y)
         throws IllegalArgumentException {
      // A more complete implementation would cache and reuse
      // popups
      return new TranslucentPopup(owner, contents, x, y);
   }
}

TranslucentPopup

JWindow

TranslucentPopup(Component owner, Component contents, int ownerX, int ownerY) {
      // create a new heavyweight window
      this.popupWindow = new JWindow();
      // mark the popup with partial opacity
      com.sun.awt.AWTUtilities.setWindowOpacity(popupWindow,
            (contents instanceof JToolTip) ? 0.8f : 0.95f);
      // determine the popup location
      popupWindow.setLocation(ownerX, ownerY);
      // add the contents to the popup
      popupWindow.getContentPane().add(contents, BorderLayout.CENTER);
      contents.invalidate();
      JComponent parent = (JComponent) contents.getParent();
      // set the shadow border
      parent.setBorder(new ShadowPopupBorder());
   }

Popup

show()

@Override
   public void show() {
      this.popupWindow.setVisible(true);
      this.popupWindow.pack();
      // mark the window as non-opaque, so that the
      // shadow border pixels take on the per-pixel
      // translucency
      com.sun.awt.AWTUtilities.setWindowOpaque(this.popupWindow, false);
   }

hide()

@Override
   public void hide() {
      this.popupWindow.setVisible(false);
      this.popupWindow.removeAll();
      this.popupWindow.dispose();
   }

PopupFactory.setSharedInstance(new TranslucentPopupFactory());

AWTUtilities

show()

@Override
   public void show() {
      if (this.toFade) {
         // mark the popup with 0% opacity
         this.currOpacity = 0;
         com.sun.awt.AWTUtilities.setWindowOpacity(popupWindow, 0.0f);
      }

      this.popupWindow.setVisible(true);
      this.popupWindow.pack();

      // mark the window as non-opaque, so that the
      // shadow border pixels take on the per-pixel
      // translucency
      com.sun.awt.AWTUtilities.setWindowOpaque(this.popupWindow, false);

      if (this.toFade) {
         // start fading in
         this.fadeInTimer = new Timer(50, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
               currOpacity += 20;
               if (currOpacity <= 100) {
                  com.sun.awt.AWTUtilities.setWindowOpacity(popupWindow,
                        currOpacity / 100.0f);
                  // workaround bug 6670649 - should call
                  // popupWindow.repaint() but that will not repaint the
                  // panel
                  popupWindow.getContentPane().repaint();
               } else {
                  currOpacity = 100;
                  fadeInTimer.stop();
               }
            }
         });
         this.fadeInTimer.setRepeats(true);
         this.fadeInTimer.start();
      }
   }

hide()

@Override
   public void hide() {
      if (this.toFade) {
         // cancel fade-in if it's running.
         if (this.fadeInTimer.isRunning())
            this.fadeInTimer.stop();

         // start fading out
         this.fadeOutTimer = new Timer(50, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
               currOpacity -= 10;
               if (currOpacity >= 0) {
                  com.sun.awt.AWTUtilities.setWindowOpacity(popupWindow,
                        currOpacity / 100.0f);
                  // workaround bug 6670649 - should call
                  // popupWindow.repaint() but that will not repaint the
                  // panel
                  popupWindow.getContentPane().repaint();
               } else {
                  fadeOutTimer.stop();
                  popupWindow.setVisible(false);
                  popupWindow.removeAll();
                  popupWindow.dispose();
                  currOpacity = 0;
               }
            }
         });
         this.fadeOutTimer.setRepeats(true);
         this.fadeOutTimer.start();
      } else {
         popupWindow.setVisible(false);
         popupWindow.removeAll();
         popupWindow.dispose();
      }
   }

toFade

true

视频反射

JFrame

JReflectionFrame

paintComponent()

public JReflectionFrame(String title) {
      super(title);
      reflection = new JWindow();
      reflectionPanel = new JPanel() {
         @Override
         protected void paintComponent(Graphics g) {
            // paint the reflection of the main window
            paintReflection(g);
         }
      };
      // mark the panel as non-double buffered and non-opaque
      // to make it translucent.
      reflectionPanel.setDoubleBuffered(false);
      reflectionPanel.setOpaque(false);

      reflection.setLayout(new BorderLayout());
      reflection.add(reflectionPanel, BorderLayout.CENTER);

      // register listeners - see below
      ...

      // initialize the reflection size and location
      reflection.setSize(getSize());
      reflection.setLocation(getX(), getY() + getHeight());
      reflection.setVisible(true);

      // install custom repaint manager to force re-painting
      // the reflection when something in the main window is
      // repainted
      RepaintManager.setCurrentManager(new ReflectionRepaintManager());
   }

this.addComponentListener(new ComponentAdapter() {
         @Override
         public void componentHidden(ComponentEvent e) {
            reflection.setVisible(false);
         }

         @Override
         public void componentMoved(ComponentEvent e) {
            // update the reflection location
            reflection.setLocation(getX(), getY() + getHeight());
         }

         @Override
         public void componentResized(ComponentEvent e) {
            // update the reflection size and location
            reflection.setSize(getWidth(), getHeight());
            reflection.setLocation(getX(), getY() + getHeight());
         }

         @Override
         public void componentShown(ComponentEvent e) {
            reflection.setVisible(true);

            // if the reflection window is opaque, mark
            // it as per-pixel translucent
            if (com.sun.awt.AWTUtilities.isWindowOpaque(reflection)) {
               com.sun.awt.AWTUtilities.setWindowOpaque(reflection, false);
            }
         }
      });

      this.addWindowListener(new WindowAdapter() {
         @Override
         public void windowActivated(WindowEvent e) {
            // force showing the reflection window
            reflection.setAlwaysOnTop(true);
            reflection.setAlwaysOnTop(false);
         }
      });

private class ReflectionRepaintManager extends RepaintManager {
      @Override
      public void addDirtyRegion(JComponent c, int x, int y, int w, int h) {
         Window win = SwingUtilities.getWindowAncestor(c);
         if (win instanceof JReflectionFrame) {
            // mark the entire root pane to be repainted
            JRootPane rp = ((JReflectionFrame) win).getRootPane();
            super.addDirtyRegion(rp, 0, 0, rp.getWidth(), rp.getHeight());

            // workaround bug 6670649 - should call reflection.repaint()
            // but that will not repaint the panel
            reflectionPanel.repaint();
         } else {
            super.addDirtyRegion(c, x, y, w, h);
         }
      }
   }

结束语

参考资料

章节