我是一名Java SE开发人员,我们的程序仅在Windows操作系统上运行,该程序需要打开文件并在UI中显示文件内容,我们在JInternalFrame中显示文件内容,并且在文件打开时始终使用
最近,由于一个重大错误,我们将程序从
所以问题是:
(1)我能关闭这个功能吗?
(2)如果不能关闭,是否有另一种方法可以避免闪烁效果,同时我仍然可以在JInternalFrame上使用
如果我没有解释清楚,这里是演示警报效果的示例代码,请运行程序并切换到其他窗口,然后它应该会闪烁。我已经在Windows 7、Windows 8.1和Windows 10上进行了测试,它们都有相同的警报效果。
setselected(true)
。最近,由于一个重大错误,我们将程序从
JRE1.6.0_41
更新到JRE1.8.0_144
,并注意到在JRE1.8.0_144中,当我们的程序(JFrame)没有焦点并在JFrame中调用setselected(true)
时,JFrame会在任务栏中闪烁,而在JRE1.6.0_41中则不会。一些客户认为这很烦人,因为他们经常需要打开文件。所以问题是:
(1)我能关闭这个功能吗?
(2)如果不能关闭,是否有另一种方法可以避免闪烁效果,同时我仍然可以在JInternalFrame上使用
setSelected()
?如果我没有解释清楚,这里是演示警报效果的示例代码,请运行程序并切换到其他窗口,然后它应该会闪烁。我已经在Windows 7、Windows 8.1和Windows 10上进行了测试,它们都有相同的警报效果。
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();
}
});
}
}
更新 01
这是更新代码,根据@camickr的建议添加了KeyboardFocusManager
和WindowListener
,只有在JFrame获得焦点或JFrame拥有焦点时才对JInternalFrame执行setselected(true)
,但如果您频繁切换窗口,则仍会出现警报。我认为这是因为在setselected(true)
在JInternalFrame之前,JFrame失去了焦点。也许有一种方法可以改进代码?
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();
}
});
}
}
更新02
尝试使用getGlobalActiveWindow()
和windowActivated/windowDeactivated
,但如果频繁切换窗口,警报仍然会出现。以下是测试代码:
getGlobalActiveWindow()
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;
/********************************************* update codes *********************************************/
private MyDefaultKeyboardFocusManager m_MyKeyboardFocusManager = new MyDefaultKeyboardFocusManager();
public class MyDefaultKeyboardFocusManager extends DefaultKeyboardFocusManager {
//The method is protected, need to add public method to call it
public Window myGetGlobalActiveWindow() {
return this.getGlobalActiveWindow();
}
}
/********************************************* 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 *********************************************/
KeyboardFocusManager.setCurrentKeyboardFocusManager(m_MyKeyboardFocusManager);
/********************************************* 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) {
}
});
// 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_MyKeyboardFocusManager.myGetGlobalActiveWindow() == 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();
}
});
}
}
windowActivated/windowDeactivated
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;
/********************************************* 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();
}
});
}
}
JDialog
而不是JFrame
。(我在问题中添加了Swing标签,所以很可能你会从SO上的Swing大师那里获得更好的选项。) - c0der