Java 如何防止任务栏中的JFrame警报效果
我是一名Java SE开发人员，我们的程序只在windows操作系统上运行，程序需要打开文件并在UI中显示，我们在JInternalFrame中显示文件内容，并且在打开文件时总是Java 如何防止任务栏中的JFrame警报效果,java,swing,jframe,taskbar,jinternalframe,Java,Swing,Jframe,Taskbar,Jinternalframe,我是一名Java SE开发人员，我们的程序只在windows操作系统上运行，程序需要打开文件并在UI中显示，我们在JInternalFrame中显示文件内容，并且在打开文件时总是setselected（true） 最近，我们将我们的程序从JRE1.6.0_41更新为JRE1.8.0_144，以查找一个主要错误，并注意到在JRE1.8.0_144中，当我们的程序（JFrame）没有聚焦并在JFrame中的JInternalFrame上调用setselected（true）时，JFrame会在任务栏
setselected（true）JRE1.6.0_41JRE1.8.0_144setselected（true）setSelected（）import javax.swing.JInternalFrame;
import javax.swing.SwingUtilities;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import java.awt.*;
/*
* Copy and modified by Oracle sample code "InternalFrameDemo.java"
*/
public class Login extends JFrame {
JDesktopPane desktop;
private int m_iFrameCounter = 0;
public Login() {
super("InternalFrameDemo");
//Make the big window be indented 50 pixels from each edge
//of the screen.
int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);
//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
createFrame(); //create first "window"
setContentPane(desktop);
//Make dragging a little faster but perhaps uglier.
desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
// Add new frame every second
Thread addFrameThread = new Thread() {
@Override
public void run() {
while(true) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createFrame();
}
});
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};
addFrameThread.start();
}
//Create a new internal frame.
protected void createFrame() {
JInternalFrame frame = new JInternalFrame();
frame.setTitle("" + m_iFrameCounter);
frame.setSize(100, 100);
frame.setLocation(0, 0);
frame.setVisible(true); //necessary as of 1.3
desktop.add(frame);
frame.moveToFront();
try {
frame.setSelected(true);
} catch (java.beans.PropertyVetoException e) {}
m_iFrameCounter++;
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
Login frame = new Login();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
KeyboardFocusManagerWindowListenersetselected（true）setselected（true）import javax.swing.JInternalFrame;
import javax.swing.SwingUtilities;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.beans.PropertyVetoException;
/*
* Copy and modified by Oracle sample code "InternalFrameDemo.java"
*/
public class Login extends JFrame {
JDesktopPane desktop;
private int m_iFrameCounter = 0;
private JInternalFrame m_InternalFrameWaitSelected = null;
public Login() {
super("InternalFrameDemo");
//Make the big window be indented 50 pixels from each edge
//of the screen.
int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);
//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
createFrame(); //create first "window"
setContentPane(desktop);
//Make dragging a little faster but perhaps uglier.
desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
/********************************************* update codes *********************************************/
//Add window listener to set last JInternalframe selected when JFrame activated
this.addWindowListener(new WindowListener() {
@Override
public void windowOpened(WindowEvent e) {
}
@Override
public void windowClosing(WindowEvent e) {
}
@Override
public void windowClosed(WindowEvent e) {
}
@Override
public void windowIconified(WindowEvent e) {
}
@Override
public void windowDeiconified(WindowEvent e) {
}
@Override
public void windowActivated(WindowEvent e) {
if (m_InternalFrameWaitSelected != null) {
try {
m_InternalFrameWaitSelected.setSelected(true);
} catch (PropertyVetoException e1) {
e1.printStackTrace();
}
m_InternalFrameWaitSelected = null;
}
}
@Override
public void windowDeactivated(WindowEvent e) {
}
});
/********************************************* update codes *********************************************/
// Add new frame every 50 millisecond
Thread addFrameThread = new Thread() {
@Override
public void run() {
while(true) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createFrame();
}
});
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};
addFrameThread.start();
}
//Create a new internal frame.
protected void createFrame() {
JInternalFrame frame = new JInternalFrame();
frame.setTitle("" + m_iFrameCounter);
frame.setSize(100, 100);
frame.setLocation(0, 0);
frame.setVisible(true); //necessary as of 1.3
desktop.add(frame);
frame.moveToFront();
/********************************************* update codes *********************************************/
// Only setselect(true) when JFrame is focus owner
if (KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner() != null &&
SwingUtilities.isDescendingFrom(KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner(), this)) {
try {
frame.setSelected(true);
} catch (java.beans.PropertyVetoException e) {}
} else {
m_InternalFrameWaitSelected = frame;
}
/********************************************* update codes *********************************************/
m_iFrameCounter++;
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
Login frame = new Login();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
GetGlobalActiveWindows（）windowActivated/windowDeactivatedimport javax.swing.JInternalFrame;
import javax.swing.SwingUtilities;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.beans.PropertyVetoException;
/*
* Copy and modified by Oracle sample code "InternalFrameDemo.java"
*/
public class Login extends JFrame {
JDesktopPane desktop;
private int m_iFrameCounter = 0;
private JInternalFrame m_InternalFrameWaitSelected = null;
/********************************************* update codes *********************************************/
private boolean m_bIsFrameActive = false;
/********************************************* update codes *********************************************/
public Login() {
super("InternalFrameDemo");
//Make the big window be indented 50 pixels from each edge
//of the screen.
int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);
//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
setContentPane(desktop);
//Make dragging a little faster but perhaps uglier.
desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
/********************************************* update codes *********************************************/
//Add window listener to set last JInternalframe selected when JFrame activated
this.addWindowListener(new WindowListener() {
@Override
public void windowOpened(WindowEvent e) {
}
@Override
public void windowClosing(WindowEvent e) {
}
@Override
public void windowClosed(WindowEvent e) {
}
@Override
public void windowIconified(WindowEvent e) {
}
@Override
public void windowDeiconified(WindowEvent e) {
}
@Override
public void windowActivated(WindowEvent e) {
m_bIsFrameActive = true;
if (m_InternalFrameWaitSelected != null) {
try {
m_InternalFrameWaitSelected.setSelected(true);
} catch (PropertyVetoException e1) {
e1.printStackTrace();
}
m_InternalFrameWaitSelected = null;
}
}
@Override
public void windowDeactivated(WindowEvent e) {
m_bIsFrameActive = false;
}
});
/********************************************* update codes *********************************************/
// Add new frame every 50 millisecond
Thread addFrameThread = new Thread() {
@Override
public void run() {
while(true) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createFrame();
}
});
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};
addFrameThread.start();
}
//Create a new internal frame.
protected void createFrame() {
JInternalFrame frame = new JInternalFrame();
frame.setTitle("" + m_iFrameCounter);
frame.setSize(100, 100);
frame.setLocation(0, 0);
frame.setVisible(true); //necessary as of 1.3
desktop.add(frame);
frame.moveToFront();
/********************************************* update codes *********************************************/
// Only setselect(true) when JFrame is active
if (m_bIsFrameActive) {
try {
frame.setSelected(true);
} catch (java.beans.PropertyVetoException e) {}
} else {
m_InternalFrameWaitSelected = frame;
}
/********************************************* update codes *********************************************/
m_iFrameCounter++;
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
Login frame = new Login();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
setSelected（）KeyboardFocusManagerWindowListenerwindowActivated//if (KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner() != null &&
// SwingUtilities.isDescendingFrom(KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner(), this)) {
if (KeyboardFocusManager.getCurrentKeyboardFocusManager().getActiveWindow() == this)
{
try
{
System.out.println("active");
frame.setSelected(true);
}
catch (java.beans.PropertyVetoException e) {}
}
else
{
System.out.println("not");
// frame = m_InternalFrameWaitSelected;
m_InternalFrameWaitSelected = frame;
}
getGlobalActiveWindow（）// frame = m_InternalFrameWaitSelected;
m_InternalFrameWaitSelected = frame;
如果有人对答案感兴趣，在我追踪JInternalFrame中的源代码之后，我发现闪烁效应是由调用
setSelected（true）requestFocus（）requestFocusInWindow（）替换requestFocusInWindow（）
，现在眨眼效果消失了
这是我对这个问题的最终解决方案：
import javax.swing.JInternalFrame;
import javax.swing.SwingUtilities;
import sun.swing.SwingUtilities2;
import javax.swing.InternalFrameFocusTraversalPolicy;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.beans.PropertyVetoException;
/*
* Copy and modified by Oracle sample code "InternalFrameDemo.java"
*/
public class Login extends JFrame {
JDesktopPane desktop;
private int m_iFrameCounter = 0;
/**
* This class is created to handle problem that program would blink in taskbar
* when call setSelected(true) on JInternalFrame base on JRE1.8.0_144, the only different content is
* use lastFocusOwner.requestFocusInWindow(); instead of lastFocusOwner.requestFocus();
* in method restoreSubcomponentFocus()
*
*/
public class MyInternalFrame extends JInternalFrame {
private Component lastFocusOwner;
private final String BASE_JRE_VERSION = "1.8.0_144";
public MyInternalFrame() {
_checkJavaVersion();
}
public MyInternalFrame(String title) {
super(title);
_checkJavaVersion();
}
public MyInternalFrame(String title, boolean resizable) {
super(title, resizable);
_checkJavaVersion();
}
public MyInternalFrame(String title, boolean resizable, boolean closable) {
super(title, resizable, closable);
_checkJavaVersion();
}
public MyInternalFrame(String title, boolean resizable, boolean closable, boolean maximizable) {
super(title, resizable, closable, maximizable);
_checkJavaVersion();
}
public MyInternalFrame(String title, boolean resizable, boolean closable, boolean maximizable, boolean iconifiable) {
super(title, resizable, closable, maximizable, iconifiable);
_checkJavaVersion();
}
private void _checkJavaVersion() {
if (!BASE_JRE_VERSION.equals(System.getProperty("java.version")))
System.err.println(String.format("%s is not compatible with current Java runtime version : %s ", this.getClass().toString(), System.getProperty("java.version")));
}
@Override
public void restoreSubcomponentFocus() {
if (isIcon()) {
SwingUtilities2.compositeRequestFocus(getDesktopIcon());
}
else {
Component component = KeyboardFocusManager.getCurrentKeyboardFocusManager().getPermanentFocusOwner();
if ((component == null) || !SwingUtilities.isDescendingFrom(component, this)) {
// FocusPropertyChangeListener will eventually update
// lastFocusOwner. As focus requests are asynchronous
// lastFocusOwner may be accessed before it has been correctly
// updated. To avoid any problems, lastFocusOwner is immediately
// set, assuming the request will succeed.
setLastFocusOwner(getMostRecentFocusOwner());
if (lastFocusOwner == null) {
// Make sure focus is restored somewhere, so that
// we don't leave a focused component in another frame while
// this frame is selected.
setLastFocusOwner(getContentPane());
}
lastFocusOwner.requestFocusInWindow();
}
}
}
private void setLastFocusOwner(Component component) {
lastFocusOwner = component;
}
@Override
public Component getMostRecentFocusOwner() {
if (isSelected()) {
return getFocusOwner();
}
if (lastFocusOwner != null) {
return lastFocusOwner;
}
FocusTraversalPolicy policy = getFocusTraversalPolicy();
if (policy instanceof InternalFrameFocusTraversalPolicy) {
return ((InternalFrameFocusTraversalPolicy)policy).
getInitialComponent(this);
}
Component toFocus = policy.getDefaultComponent(this);
if (toFocus != null) {
return toFocus;
}
return getContentPane();
}
@Override
public Component getFocusOwner() {
if (isSelected()) {
return lastFocusOwner;
}
return null;
}
}
public Login() {
super("InternalFrameDemo");
//Make the big window be indented 50 pixels from each edge
//of the screen.
int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);
//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
setContentPane(desktop);
//Make dragging a little faster but perhaps uglier.
desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
// Add new frame every 50 millisecond
Thread addFrameThread = new Thread() {
@Override
public void run() {
while(true) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createFrame();
}
});
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};
addFrameThread.start();
}
//Create a new internal frame.
protected void createFrame() {
JInternalFrame frame = new MyInternalFrame();
frame.setTitle("" + m_iFrameCounter);
frame.setSize(100, 100);
frame.setLocation(0, 0);
frame.setVisible(true); //necessary as of 1.3
desktop.add(frame);
frame.moveToFront();
try {
frame.setSelected(true);
} catch (java.beans.PropertyVetoException e) {}
m_iFrameCounter++;
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
Login frame = new Login();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
欢迎来到SO。如果没有任务栏图标是一个选项，请使用JDialog
而不是JFrame
。（我在问题中添加了Swing标签，因此您很可能会从Swing专家的on-so中获得更好的选项。）我认为这是windows提供的很酷的功能。每当帧更改其状态时，它都会闪烁以通知用户。然而，一旦你打开你的窗口，它将停止闪烁。为什么要关闭此功能？@Shahid因为我们的一些客户需要一次打开很多文件，在打开文件的过程中，他们会做一些其他事情，导致我们的程序失去焦点，然后我们的程序不断闪烁，这让我们的客户感到恼火。谢谢您的建议，我在我的代码中添加了KeyboardFocusManager
和WindowListener
，请查看我的更新。谢谢，frame=m_InternalFrameWaitSelected是一个愚蠢的错误，我纠正了它。我添加了getGlobalActiveWindow（）
和windowActivated/windowDeactivated
测试代码，请查看我的更新。@exister，我刚刚注意到，JFrame有一个isActive（）
方法。也许这比使用KeyboardFocusManager更好。如果仍然有问题，那么我不知道。我建议中的关键概念是知道框架何时处于活动状态，何时处于非活动状态。如果此处建议的方法或窗口侦听器没有为您提供正确的窗口状态，那么这似乎是一个Java问题，我不知道还有什么建议。尝试了JFrameisActive（）
，但仍然无法正常工作，无论如何，得到您的帮助很好，谢谢。
import javax.swing.JInternalFrame;
import javax.swing.SwingUtilities;
import sun.swing.SwingUtilities2;
import javax.swing.InternalFrameFocusTraversalPolicy;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.beans.PropertyVetoException;
/*
* Copy and modified by Oracle sample code "InternalFrameDemo.java"
*/
public class Login extends JFrame {
JDesktopPane desktop;
private int m_iFrameCounter = 0;
/**
* This class is created to handle problem that program would blink in taskbar
* when call setSelected(true) on JInternalFrame base on JRE1.8.0_144, the only different content is
* use lastFocusOwner.requestFocusInWindow(); instead of lastFocusOwner.requestFocus();
* in method restoreSubcomponentFocus()
*
*/
public class MyInternalFrame extends JInternalFrame {
private Component lastFocusOwner;
private final String BASE_JRE_VERSION = "1.8.0_144";
public MyInternalFrame() {
_checkJavaVersion();
}
public MyInternalFrame(String title) {
super(title);
_checkJavaVersion();
}
public MyInternalFrame(String title, boolean resizable) {
super(title, resizable);
_checkJavaVersion();
}
public MyInternalFrame(String title, boolean resizable, boolean closable) {
super(title, resizable, closable);
_checkJavaVersion();
}
public MyInternalFrame(String title, boolean resizable, boolean closable, boolean maximizable) {
super(title, resizable, closable, maximizable);
_checkJavaVersion();
}
public MyInternalFrame(String title, boolean resizable, boolean closable, boolean maximizable, boolean iconifiable) {
super(title, resizable, closable, maximizable, iconifiable);
_checkJavaVersion();
}
private void _checkJavaVersion() {
if (!BASE_JRE_VERSION.equals(System.getProperty("java.version")))
System.err.println(String.format("%s is not compatible with current Java runtime version : %s ", this.getClass().toString(), System.getProperty("java.version")));
}
@Override
public void restoreSubcomponentFocus() {
if (isIcon()) {
SwingUtilities2.compositeRequestFocus(getDesktopIcon());
}
else {
Component component = KeyboardFocusManager.getCurrentKeyboardFocusManager().getPermanentFocusOwner();
if ((component == null) || !SwingUtilities.isDescendingFrom(component, this)) {
// FocusPropertyChangeListener will eventually update
// lastFocusOwner. As focus requests are asynchronous
// lastFocusOwner may be accessed before it has been correctly
// updated. To avoid any problems, lastFocusOwner is immediately
// set, assuming the request will succeed.
setLastFocusOwner(getMostRecentFocusOwner());
if (lastFocusOwner == null) {
// Make sure focus is restored somewhere, so that
// we don't leave a focused component in another frame while
// this frame is selected.
setLastFocusOwner(getContentPane());
}
lastFocusOwner.requestFocusInWindow();
}
}
}
private void setLastFocusOwner(Component component) {
lastFocusOwner = component;
}
@Override
public Component getMostRecentFocusOwner() {
if (isSelected()) {
return getFocusOwner();
}
if (lastFocusOwner != null) {
return lastFocusOwner;
}
FocusTraversalPolicy policy = getFocusTraversalPolicy();
if (policy instanceof InternalFrameFocusTraversalPolicy) {
return ((InternalFrameFocusTraversalPolicy)policy).
getInitialComponent(this);
}
Component toFocus = policy.getDefaultComponent(this);
if (toFocus != null) {
return toFocus;
}
return getContentPane();
}
@Override
public Component getFocusOwner() {
if (isSelected()) {
return lastFocusOwner;
}
return null;
}
}
public Login() {
super("InternalFrameDemo");
//Make the big window be indented 50 pixels from each edge
//of the screen.
int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);
//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
setContentPane(desktop);
//Make dragging a little faster but perhaps uglier.
desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
// Add new frame every 50 millisecond
Thread addFrameThread = new Thread() {
@Override
public void run() {
while(true) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createFrame();
}
});
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};
addFrameThread.start();
}
//Create a new internal frame.
protected void createFrame() {
JInternalFrame frame = new MyInternalFrame();
frame.setTitle("" + m_iFrameCounter);
frame.setSize(100, 100);
frame.setLocation(0, 0);
frame.setVisible(true); //necessary as of 1.3
desktop.add(frame);
frame.moveToFront();
try {
frame.setSelected(true);
} catch (java.beans.PropertyVetoException e) {}
m_iFrameCounter++;
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
Login frame = new Login();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}