为什么jframe在最大化时隐藏任务栏?

2022-01-24 00:00:00 java swing jframe taskbar

我在我的 jFrame 中使用 setUndecorated(true); 和 getRootPane().setWindowDecorationStyle(JRootPane.FRAME);.这很好用，但是现在当我最大化我的框架时，它遍布整个窗口，甚至任务栏都不可见.如何使框架不隐藏任务栏?

I'm using setUndecorated(true); and getRootPane().setWindowDecorationStyle(JRootPane.FRAME); in my jFrame. This works great but now when I maximized my frame it spreads all over the window even taskbar is not visible. What can I do to make frame not to hide taskbar?

此外，当我多次最大化最小化我的框架时，光标会更改为这个 <->，当光标位于框架的边界时，它通常用于更改框架的大小.有什么我可以做的吗?

Also when I maximize minimize my frame multiple times the cursor is changed to this <-> which is generally used change size of frame when cursor is on the border of frame. Is there anything I can do for this?

一个小代码就可以重现这个东西:

A small code then can reproduce the thing:

import javax.swing.JFrame;
import javax.swing.JRootPane;
public class Demo extends JFrame {
    public Demo() {
        setSize(250,125);
        setUndecorated(true);
        getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
        setVisible(true);
    }
    public static void main(String[] args) {
        new Demo();
    }
}

推荐答案

这是一个已知错误:http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4737788

来自此链接的引用:

一种解决方法是继承 JFrame 和覆盖 setExtendedState 方法，之前捕获任何最大化事件它们发生并设置最大值适当的框架边界在调用超类之前setExtendedState 方法.

A workaround is to subclass JFrame and override the setExtendedState method, catching any maximize events before they happen and setting the maximum bounds of the frame appropriately before calling the superclass's setExtendedState method.

import java.awt.*;
import javax.swing.*;

public class PFrame extends JFrame
{
private Rectangle maxBounds;

public PFrame()
{
    super();        
    maxBounds = null;
}

//Full implementation has other JFrame constructors

public Rectangle getMaximizedBounds()
{
    return(maxBounds);
}

public synchronized void setMaximizedBounds(Rectangle maxBounds)
{
    this.maxBounds = maxBounds;
    super.setMaximizedBounds(maxBounds);
}

public synchronized void setExtendedState(int state)
{       
    if (maxBounds == null &&
        (state & Frame.MAXIMIZED_BOTH) == Frame.MAXIMIZED_BOTH)
    {
        Insets screenInsets = getToolkit().getScreenInsets(getGraphicsConfiguration());         
        Rectangle screenSize = getGraphicsConfiguration().getBounds();
        Rectangle maxBounds = new Rectangle(screenInsets.left + screenSize.x, 
                                    screenInsets.top + screenSize.y, 
                                    screenSize.x + screenSize.width - screenInsets.right - screenInsets.left,
                                    screenSize.y + screenSize.height - screenInsets.bottom - screenInsets.top);
        super.setMaximizedBounds(maxBounds);
    }

    super.setExtendedState(state);
}
}

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