模態內部框架在JMenuItem中調用時使用100％的CPU

Question

我使用此ModalityInternalFrame（來自here - 使用的代碼在問題結束時）用於在其他內部框架上創建模態內部框架。
他們沒有問題時，他們創建並顯示從JButton的actionPerformed事件，但當我創建/ actionPerformed事件事件顯示它時，它使用100％的CPU時，它是可見的！

什麼問題？

感謝

---

ModalityInternalFrame：

package com.webbyit.swing; 

import java.awt.Color; 
import java.awt.Cursor; 
import java.awt.Dimension; 
import java.awt.Graphics; 
import java.awt.Point; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.beans.PropertyChangeEvent; 
import java.beans.PropertyVetoException; 
import java.beans.VetoableChangeListener; 
import java.util.Random; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.swing.JComponent; 
import javax.swing.JDesktopPane; 
import javax.swing.JInternalFrame; 
import javax.swing.JOptionPane; 
import javax.swing.SwingUtilities; 
import javax.swing.event.AncestorEvent; 
import javax.swing.event.AncestorListener; 
import javax.swing.event.InternalFrameAdapter; 
import javax.swing.event.InternalFrameEvent; 

/** 
* An extended <code>JInternalFrame</code> that provides modality in a child/parent 
* hierarchy 
* 
* @author webbyit 
*/ 
public class ModalityInternalFrame extends JInternalFrame { 

    protected JDesktopPane desktopPane; 
    protected JComponent parent; 
    protected ModalityInternalFrame childFrame; 
    protected JComponent focusOwner; 
    private boolean wasCloseable; 

    public void fixSize(){ 
     Dimension desktopSize = parent.getSize(); 
     Dimension jInternalFrameSize = this.getSize(); 
     if(jInternalFrameSize.getHeight()>desktopSize.getHeight()){ 
      this.setSize(new Dimension((int)jInternalFrameSize.getWidth(), (int)desktopSize.getHeight()));; 
     } 

    } 


    public ModalityInternalFrame() { 
     init(); // here to allow netbeans to use class in gui builder 
    } 

    public ModalityInternalFrame(JComponent parent) { 
     this(parent, null); 
    } 

    public ModalityInternalFrame(JComponent parent, String title) { 
     this(parent, title, false); 
    } 

    public ModalityInternalFrame(JComponent parent, String title, boolean resizable) { 
     this(parent, title, resizable, false); 
    } 

    public ModalityInternalFrame(JComponent parent, String title, boolean resizable, boolean closeable) { 
     this(parent, title, resizable, closeable, false); 
    } 

    public ModalityInternalFrame(JComponent parent, String title, boolean resizable, boolean closeable, 
           boolean maximizable) { 
     this(parent, title, resizable, closeable, maximizable, false); 
    } 

    public ModalityInternalFrame(JComponent parent, String title, boolean resizable, boolean closeable, 
           boolean maximizable, 
           boolean iconifiable) { 
     super(title, resizable, closeable, maximizable, iconifiable); 
     wasCloseable=closeable; 
     setParentFrame(parent); 
     setFocusTraversalKeysEnabled(false); 
     if (parent != null && parent instanceof ModalityInternalFrame) { 
      ((ModalityInternalFrame) parent).setChildFrame(ModalityInternalFrame.this); 
     } 

     // Add glass pane 
     ModalityInternalGlassPane glassPane = new ModalityInternalGlassPane(this); 
     setGlassPane(glassPane); 

     // Add frame listeners 
     addFrameListener(); 

     // Add frame veto listenr 
     addFrameVetoListener(); 

     init(); 

     // calculate size and position 


    } 



    private void setParentFrame(JComponent parent) { 
     desktopPane = JOptionPane.getDesktopPaneForComponent(parent); 
     this.parent = parent == null ? JOptionPane.getDesktopPaneForComponent(parent) : parent; // default to desktop if no parent given 
    } 

    public JComponent getParentFrame() { 
     return parent; 
    } 

    public void setChildFrame(ModalityInternalFrame childFrame) { 
     this.childFrame = childFrame; 
    } 

    public ModalityInternalFrame getChildFrame() { 
     return childFrame; 
    } 

    public boolean hasChildFrame() { 
     return (childFrame != null); 
    } 

    protected void addFrameVetoListener() { 
     addVetoableChangeListener(new VetoableChangeListener() { 

      public void vetoableChange(PropertyChangeEvent evt) throws PropertyVetoException { 
       if (evt.getPropertyName().equals(JInternalFrame.IS_SELECTED_PROPERTY) 
         && evt.getNewValue().equals(Boolean.TRUE)) { 
        if (hasChildFrame()) { 
         childFrame.setSelected(true); 
         if (childFrame.isIcon()) { 
          childFrame.setIcon(false); 
         } 
         throw new PropertyVetoException("no!", evt); 
        } 
       } 
      } 
     }); 
    } 

    /** 
    * Method to control the display of the glasspane, dependant 
    * on the frame being active or not 
    */ 
    protected void addFrameListener() { 
     addInternalFrameListener(new InternalFrameAdapter() { 

      @Override 
      public void internalFrameActivated(InternalFrameEvent e) { 
       if (hasChildFrame() == true) { 
        getGlassPane().setVisible(true); 
        grabFocus(); 
       } else { 
        getGlassPane().setVisible(false); 
       } 
      } 

      @Override 
      public void internalFrameDeactivated(InternalFrameEvent e) { 
       if (hasChildFrame() == true) { 
        getGlassPane().setVisible(true); 
        grabFocus(); 
       } else { 
        getGlassPane().setVisible(false); 
       } 
      } 

      @Override 
      public void internalFrameOpened(InternalFrameEvent e) { 
       getGlassPane().setVisible(false); 
      } 

      @Override 
      public void internalFrameClosing(InternalFrameEvent e) { 
       if (parent != null && parent instanceof ModalityInternalFrame) { 
        ((ModalityInternalFrame) parent).childClosing(); 
       } 
      } 
     }); 
    } 

    /** 
    * Method to handle child frame closing and make this frame 
    * available for user input again with no glasspane visible 
    */ 
    protected void childClosing() { 
     setClosable(wasCloseable); 
     getGlassPane().setVisible(false); 
     if (focusOwner != null) { 
      java.awt.EventQueue.invokeLater(new Runnable() { 

       public void run() { 
        try { 
         moveToFront(); 
         setSelected(true); 
         focusOwner.grabFocus(); 
        } catch (PropertyVetoException ex) { 
         Logger.getLogger(ModalityInternalFrame.class.getName()).log(Level.SEVERE, null, ex); 
        } 
       } 
      }); 
      focusOwner.grabFocus(); 
     } 
     getGlassPane().setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR)); 
     setChildFrame(null); 
    } 

    /* 
    * Method to handle child opening and becoming visible. 
    */ 
    protected void childOpening() { 
     // record the present focused component 
     setClosable(false); 
     focusOwner = (JComponent) getFocusOwner(); 
     grabFocus(); 
     getGlassPane().setVisible(true); 
     getGlassPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)); 
    } 

    @Override 
    public void show() { 
     if (parent != null && parent instanceof ModalityInternalFrame) { 
      // Need to inform parent its about to lose its focus due 
      // to child opening 
      ((ModalityInternalFrame) parent).childOpening(); 
     } 
     calculateBounds(); 
     super.show(); 
    } 

    protected void init() { 
     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
       layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 394, Short.MAX_VALUE)); 
     layout.setVerticalGroup(
       layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 274, Short.MAX_VALUE)); 

     pack(); 
    } 

    public void calculateBounds() { 
     Dimension frameSize = getPreferredSize(); 
     Dimension parentSize = new Dimension(); 
     Dimension rootSize = new Dimension(); // size of desktop 
     Point frameCoord = new Point(); 

     if (desktopPane != null) { 
      rootSize = desktopPane.getSize(); // size of desktop 
      frameCoord = SwingUtilities.convertPoint(parent, 0, 0, desktopPane); 
      parentSize = parent.getSize(); 
     } 

     //setBounds((rootSize.width - frameSize.width)/2, (rootSize.height - frameSize.height)/2, frameSize.width, frameSize.height); 

     // We want dialog centered relative to its parent component 
     //int x = (parentSize.width - frameSize.width)/2 + frameCoord.x; 
     //int y = (parentSize.height - frameSize.height)/2 + frameCoord.y; 
     Random RND=new Random(); 
     int x=RND.nextInt(frameSize.width); 
     int y=RND.nextInt(frameSize.height); 


     // If possible, dialog should be fully visible 
     int ovrx = x + frameSize.width - rootSize.width; 
     int ovry = y + frameSize.height - rootSize.height; 
     x = Math.max((ovrx > 0 ? x - ovrx : x), 0); 
     y = Math.max((ovry > 0 ? y - ovry : y), 0); 
     setBounds(x, y, frameSize.width, frameSize.height); 
    } 


    /** 
    * Glass pane to overlay. Listens for mouse clicks and sets selected 
    * on associated modal frame. Also if modal frame has no children make 
    * class pane invisible 
    */ 
    class ModalityInternalGlassPane extends JComponent { 

     private ModalityInternalFrame modalFrame; 

     public ModalityInternalGlassPane(ModalityInternalFrame frame) { 
      modalFrame = frame; 
      addMouseListener(new MouseAdapter() { 

       @Override 
       public void mouseClicked(MouseEvent e) { 
        if (modalFrame.isSelected() == false) { 
         try { 
          modalFrame.setSelected(true); 
          if (modalFrame.hasChildFrame() == false) { 
           setVisible(false); 
          } 
         } catch (PropertyVetoException e1) { 
          //e1.printStackTrace(); 
         } 
        } 
       } 
      }); 
     } 

     @Override 
     public void paint(Graphics g) { 
      super.paint(g); 
      g.setColor(new Color(255, 255, 255, 100)); 
      g.fillRect(0, 0, getWidth(), getHeight()); 
     } 
    } 
} 

Answer 1

我曾嘗試你的代碼與本附加主，並沒有造成任何問題。也許嘗試後的SSCCE：

import java.awt.Color; 
import java.awt.Cursor; 
import java.awt.Dimension; 
import java.awt.Graphics; 
import java.awt.Point; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.beans.PropertyChangeEvent; 
import java.beans.PropertyVetoException; 
import java.beans.VetoableChangeListener; 
import java.util.Random; 
import java.util.logging.Level; 
import java.util.logging.Logger; 

import javax.swing.JComponent; 
import javax.swing.JDesktopPane; 
import javax.swing.JFrame; 
import javax.swing.JInternalFrame; 
import javax.swing.JOptionPane; 
import javax.swing.SwingUtilities; 
import javax.swing.event.InternalFrameAdapter; 
import javax.swing.event.InternalFrameEvent; 

/** 
* An extended <code>JInternalFrame</code> that provides modality in a child/parent hierarchy 
* 
* @author webbyit 
*/ 
public class ModalityInternalFrame extends JInternalFrame { 

    protected JDesktopPane desktopPane; 
    protected JComponent parent; 
    protected ModalityInternalFrame childFrame; 
    protected JComponent focusOwner; 
    private boolean wasCloseable; 

    public void fixSize() { 
     Dimension desktopSize = parent.getSize(); 
     Dimension jInternalFrameSize = this.getSize(); 
     if (jInternalFrameSize.getHeight() > desktopSize.getHeight()) { 
      this.setSize(new Dimension((int) jInternalFrameSize.getWidth(), (int) desktopSize.getHeight())); 
      ; 
     } 

    } 

    public ModalityInternalFrame() { 
     init(); // here to allow netbeans to use class in gui builder 
    } 

    public ModalityInternalFrame(JComponent parent) { 
     this(parent, null); 
    } 

    public ModalityInternalFrame(JComponent parent, String title) { 
     this(parent, title, false); 
    } 

    public ModalityInternalFrame(JComponent parent, String title, boolean resizable) { 
     this(parent, title, resizable, false); 
    } 

    public ModalityInternalFrame(JComponent parent, String title, boolean resizable, boolean closeable) { 
     this(parent, title, resizable, closeable, false); 
    } 

    public ModalityInternalFrame(JComponent parent, String title, boolean resizable, boolean closeable, boolean maximizable) { 
     this(parent, title, resizable, closeable, maximizable, false); 
    } 

    public ModalityInternalFrame(JComponent parent, String title, boolean resizable, boolean closeable, boolean maximizable, 
      boolean iconifiable) { 
     super(title, resizable, closeable, maximizable, iconifiable); 
     wasCloseable = closeable; 
     setParentFrame(parent); 
     setFocusTraversalKeysEnabled(false); 
     if (parent != null && parent instanceof ModalityInternalFrame) { 
      ((ModalityInternalFrame) parent).setChildFrame(ModalityInternalFrame.this); 
     } 

     // Add glass pane 
     ModalityInternalGlassPane glassPane = new ModalityInternalGlassPane(this); 
     setGlassPane(glassPane); 

     // Add frame listeners 
     addFrameListener(); 

     // Add frame veto listenr 
     addFrameVetoListener(); 

     init(); 

     // calculate size and position 

    } 

    private void setParentFrame(JComponent parent) { 
     desktopPane = JOptionPane.getDesktopPaneForComponent(parent); 
     this.parent = parent == null ? JOptionPane.getDesktopPaneForComponent(parent) : parent; // default to desktop if no parent given 
    } 

    public JComponent getParentFrame() { 
     return parent; 
    } 

    public void setChildFrame(ModalityInternalFrame childFrame) { 
     this.childFrame = childFrame; 
    } 

    public ModalityInternalFrame getChildFrame() { 
     return childFrame; 
    } 

    public boolean hasChildFrame() { 
     return childFrame != null; 
    } 

    protected void addFrameVetoListener() { 
     addVetoableChangeListener(new VetoableChangeListener() { 

      @Override 
      public void vetoableChange(PropertyChangeEvent evt) throws PropertyVetoException { 
       if (evt.getPropertyName().equals(JInternalFrame.IS_SELECTED_PROPERTY) && evt.getNewValue().equals(Boolean.TRUE)) { 
        if (hasChildFrame()) { 
         childFrame.setSelected(true); 
         if (childFrame.isIcon()) { 
          childFrame.setIcon(false); 
         } 
         throw new PropertyVetoException("no!", evt); 
        } 
       } 
      } 
     }); 
    } 

    /** 
    * Method to control the display of the glasspane, dependant on the frame being active or not 
    */ 
    protected void addFrameListener() { 
     addInternalFrameListener(new InternalFrameAdapter() { 

      @Override 
      public void internalFrameActivated(InternalFrameEvent e) { 
       if (hasChildFrame() == true) { 
        getGlassPane().setVisible(true); 
        grabFocus(); 
       } else { 
        getGlassPane().setVisible(false); 
       } 
      } 

      @Override 
      public void internalFrameDeactivated(InternalFrameEvent e) { 
       if (hasChildFrame() == true) { 
        getGlassPane().setVisible(true); 
        grabFocus(); 
       } else { 
        getGlassPane().setVisible(false); 
       } 
      } 

      @Override 
      public void internalFrameOpened(InternalFrameEvent e) { 
       getGlassPane().setVisible(false); 
      } 

      @Override 
      public void internalFrameClosing(InternalFrameEvent e) { 
       if (parent != null && parent instanceof ModalityInternalFrame) { 
        ((ModalityInternalFrame) parent).childClosing(); 
       } 
      } 
     }); 
    } 

    /** 
    * Method to handle child frame closing and make this frame available for user input again with no glasspane visible 
    */ 
    protected void childClosing() { 
     setClosable(wasCloseable); 
     getGlassPane().setVisible(false); 
     if (focusOwner != null) { 
      java.awt.EventQueue.invokeLater(new Runnable() { 

       @Override 
       public void run() { 
        try { 
         moveToFront(); 
         setSelected(true); 
         focusOwner.grabFocus(); 
        } catch (PropertyVetoException ex) { 
         Logger.getLogger(ModalityInternalFrame.class.getName()).log(Level.SEVERE, null, ex); 
        } 
       } 
      }); 
      focusOwner.grabFocus(); 
     } 
     getGlassPane().setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR)); 
     setChildFrame(null); 
    } 

    /* 
    * Method to handle child opening and becoming visible. 
    */ 
    protected void childOpening() { 
     // record the present focused component 
     setClosable(false); 
     focusOwner = (JComponent) getFocusOwner(); 
     grabFocus(); 
     getGlassPane().setVisible(true); 
     getGlassPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)); 
    } 

    @Override 
    public void show() { 
     if (parent != null && parent instanceof ModalityInternalFrame) { 
      // Need to inform parent its about to lose its focus due 
      // to child opening 
      ((ModalityInternalFrame) parent).childOpening(); 
     } 
     calculateBounds(); 
     super.show(); 
    } 

    protected void init() { 
     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 394, Short.MAX_VALUE)); 
     layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 274, Short.MAX_VALUE)); 

     pack(); 
    } 

    public void calculateBounds() { 
     Dimension frameSize = getPreferredSize(); 
     Dimension parentSize = new Dimension(); 
     Dimension rootSize = new Dimension(); // size of desktop 
     Point frameCoord = new Point(); 

     if (desktopPane != null) { 
      rootSize = desktopPane.getSize(); // size of desktop 
      frameCoord = SwingUtilities.convertPoint(parent, 0, 0, desktopPane); 
      parentSize = parent.getSize(); 
     } 

     // setBounds((rootSize.width - frameSize.width)/2, (rootSize.height - frameSize.height)/2, frameSize.width, frameSize.height); 

     // We want dialog centered relative to its parent component 
     // int x = (parentSize.width - frameSize.width)/2 + frameCoord.x; 
     // int y = (parentSize.height - frameSize.height)/2 + frameCoord.y; 
     Random RND = new Random(); 
     int x = RND.nextInt(frameSize.width); 
     int y = RND.nextInt(frameSize.height); 

     // If possible, dialog should be fully visible 
     int ovrx = x + frameSize.width - rootSize.width; 
     int ovry = y + frameSize.height - rootSize.height; 
     x = Math.max(ovrx > 0 ? x - ovrx : x, 0); 
     y = Math.max(ovry > 0 ? y - ovry : y, 0); 
     setBounds(x, y, frameSize.width, frameSize.height); 
    } 

    /** 
    * Glass pane to overlay. Listens for mouse clicks and sets selected on associated modal frame. Also if modal frame has no children make 
    * class pane invisible 
    */ 
    class ModalityInternalGlassPane extends JComponent { 

     private ModalityInternalFrame modalFrame; 

     public ModalityInternalGlassPane(ModalityInternalFrame frame) { 
      modalFrame = frame; 
      addMouseListener(new MouseAdapter() { 

       @Override 
       public void mouseClicked(MouseEvent e) { 
        if (modalFrame.isSelected() == false) { 
         try { 
          modalFrame.setSelected(true); 
          if (modalFrame.hasChildFrame() == false) { 
           setVisible(false); 
          } 
         } catch (PropertyVetoException e1) { 
          // e1.printStackTrace(); 
         } 
        } 
       } 
      }); 
     } 

     @Override 
     public void paint(Graphics g) { 
      super.paint(g); 
      g.setColor(new Color(255, 255, 255, 100)); 
      g.fillRect(0, 0, getWidth(), getHeight()); 
     } 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       JFrame frame = new JFrame(ModalityInternalFrame.class.getSimpleName()); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       JDesktopPane pane = new JDesktopPane(); 
       ModalityInternalFrame f = new ModalityInternalFrame(); 
       pane.add(f); 
       f.setVisible(true); 
       frame.setContentPane(pane); 
       frame.setSize(600, 400); 
       frame.setVisible(true); 
      } 
     }); 
    } 
}