我正在使用这个ModalityInternalFrame（从这里 - 使用的calass代码在问题末尾）在其他内部框架上创建模态内部框架。
当它们从JButton的actionPerformed事件中创建和显示时没有问题，但是当我从JMenuItem的actionPerformed事件中创建/显示它们时，它在可见时会使用 100% 的 CPU！
问题出在哪里？
谢谢
模态内部框架：
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());
}
}
}
我已经用这个额外的 main 尝试了你的代码，它没有造成任何问题。也许尝试发布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);
}
});
}
}