- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
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,并且总是 setselected(true)
时文件被打开。
最近我们将我们的程序从 JRE1.6.0_41
更新到 JRE1.8.0_144
一个主要错误,并注意到在 JRE1.8.0_144 中当我们的程序(JFrame ) 未获得焦点并在 JFrame 中的 JInternalFrame 上调用 setselected(true)
时,JFrame 将在任务栏中闪烁,而 JRE1.6.0_41 则不会。有些客户认为这很烦人,因为他们必须经常打开文件。
所以问题是:
(1) 我可以关闭该功能吗?
(2) 如果我不能,是否有其他方法可以避免闪烁效果,同时我仍然可以在 JInternalFrame 上 setSelected()
?
如果我没有解释好,这里是演示警报效果的示例代码,请运行程序并
将其最小化到任务栏
切换到另一个窗口,然后它应该会闪烁。我在Windows 7、Windows 8.1和Windows 10上测试过,都具有相同的提示效果。
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
这是根据@camickr 建议添加KeyboardFocusManager
和WindowListener
的更新代码,仅当JFrame 有时在JInternalFrame 上setselected(true)
焦点或 JFrame 获得焦点,但如果您频繁切换窗口,警报仍然会发生,我认为这是因为 JFrame 在 setselected(true)
on JInternalFrame 之前失去了焦点。也许有改进代码的方法?
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
尝试了 getGlobalActiveWindow()
和 windowActivated/windowDeactivated
,如果频繁切换窗口,仍然会出现警报。下面是测试代码:
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();
}
});
}
}
最佳答案
we display the file contents in JInternalFrame and always setselected(true) when the file is opened.
不知道如何停止任务栏上的闪烁,但您可以通过不自动调用 setSelected() 来更改行为。
例如,您可以:
仅当框架是 Activity 窗口时调用setSelected()
。您可以使用 KeyboardFocusManager
检查窗口是否获得焦点。
向框架添加一个 WindowListener
并处理 windowActivated
事件以在最近打开的内部框架上调用 setSelected() 方法。
编辑:
run the program and minimize it into taskbar,
首先我要澄清的是,如果我将框架最小化到任务栏,则图标闪烁没有问题。
仅当我单击另一个应用程序时该图标才会闪烁,并且登录框架在仍处于打开状态时失去焦点。
the alert still happen if you switch windows frequently,
我将您的代码更改为:
//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;
}
而且我注意到,有时即使在另一个窗口中玩游戏,也会显示“Activity ”。所以出于某种原因,KeyboardFocusManager 返回了一个不正确的值(或者我不明白该方法应该如何工作?)
所以也许您可以尝试使用 getGlobalActiveWindow()
方法来查看它是否有任何不同。
如果没有,那么我的下一个建议是忘记 KeyboardFocusManager 并管理一个 boolean 变量,该变量指示您的框架是否处于 Activity 状态。因此,您可以在 windowActivated 中设置变量 true,在 windowDeactivated 中设置 false。然后在创建框架时测试此变量。
另请注意我是如何更改以下代码的:
// frame = m_InternalFrameWaitSelected;
m_InternalFrameWaitSelected = frame;
关于java - 如何防止任务栏中的JFrame警报效果,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52494358/
我正在编写一个具有以下签名的 Java 方法。 void Logger(Method method, Object[] args); 如果一个方法(例如 ABC() )调用此方法 Logger,它应该
我是 Java 新手。 我的问题是我的 Java 程序找不到我试图用作的图像文件一个 JButton。 (目前这段代码什么也没做,因为我只是得到了想要的外观第一的)。这是我的主课 代码: packag
好的,今天我在接受采访,我已经编写 Java 代码多年了。采访中说“Java 垃圾收集是一个棘手的问题,我有几个 friend 一直在努力弄清楚。你在这方面做得怎么样?”。她是想骗我吗?还是我的一生都
我的 friend 给了我一个谜语让我解开。它是这样的: There are 100 people. Each one of them, in his turn, does the following
如果我将使用 Java 5 代码的应用程序编译成字节码,生成的 .class 文件是否能够在 Java 1.4 下运行? 如果后者可以工作并且我正在尝试在我的 Java 1.4 应用程序中使用 Jav
有关于why Java doesn't support unsigned types的问题以及一些关于处理无符号类型的问题。我做了一些搜索,似乎 Scala 也不支持无符号数据类型。限制是Java和S
我只是想知道在一个 java 版本中生成的字节码是否可以在其他 java 版本上运行 最佳答案 通常,字节码无需修改即可在 较新 版本的 Java 上运行。它不会在旧版本上运行,除非您使用特殊参数 (
我有一个关于在命令提示符下执行 java 程序的基本问题。 在某些机器上我们需要指定 -cp 。 (类路径)同时执行java程序 (test为java文件名与.class文件存在于同一目录下) jav
我已经阅读 StackOverflow 有一段时间了,现在我才鼓起勇气提出问题。我今年 20 岁,目前在我的家乡(罗马尼亚克卢日-纳波卡)就读 IT 大学。足以介绍:D。 基本上,我有一家提供簿记应用
我有 public JSONObject parseXML(String xml) { JSONObject jsonObject = XML.toJSONObject(xml); r
我已经在 Java 中实现了带有动态类型的简单解释语言。不幸的是我遇到了以下问题。测试时如下代码: def main() { def ks = Map[[1, 2]].keySet()
一直提示输入 1 到 10 的数字 - 结果应将 st、rd、th 和 nd 添加到数字中。编写一个程序,提示用户输入 1 到 10 之间的任意整数,然后以序数形式显示该整数并附加后缀。 public
我有这个 DownloadFile.java 并按预期下载该文件: import java.io.*; import java.net.URL; public class DownloadFile {
我想在 GUI 上添加延迟。我放置了 2 个 for 循环,然后重新绘制了一个标签,但这 2 个 for 循环一个接一个地执行,并且标签被重新绘制到最后一个。 我能做什么? for(int i=0;
我正在对对象 Student 的列表项进行一些测试,但是我更喜欢在 java 类对象中创建硬编码列表,然后从那里提取数据,而不是连接到数据库并在结果集中选择记录。然而,自从我这样做以来已经很长时间了,
我知道对象创建分为三个部分: 声明 实例化 初始化 classA{} classB extends classA{} classA obj = new classB(1,1); 实例化 它必须使用
我有兴趣使用 GPRS 构建车辆跟踪系统。但是,我有一些问题要问以前做过此操作的人: GPRS 是最好的技术吗?人们意识到任何问题吗? 我计划使用 Java/Java EE - 有更好的技术吗? 如果
我可以通过递归方法反转数组,例如:数组={1,2,3,4,5} 数组结果={5,4,3,2,1}但我的结果是相同的数组,我不知道为什么,请帮助我。 public class Recursion { p
有这样的标准方式吗? 包括 Java源代码-测试代码- Ant 或 Maven联合单元持续集成(可能是巡航控制)ClearCase 版本控制工具部署到应用服务器 最后我希望有一个自动构建和集成环境。
我什至不知道这是否可能,我非常怀疑它是否可能,但如果可以,您能告诉我怎么做吗?我只是想知道如何从打印机打印一些文本。 有什么想法吗? 最佳答案 这里有更简单的事情。 import javax.swin
我是一名优秀的程序员,十分优秀!