Question

This question讨论了JFrame扩展到Windows任务栏的已知错误。 An answer链接到错误报告（具有各种重复项）并提供解决方法。我发现问题也适用于JDialogs。 JFrame解决方法不适用。是否有类似的解决方法使JDialogs在Windows上表现自己？

示例代码：

import javax.swing.*;

public class Demo extends JDialog {
    public Demo() {
        setSize(250,12500);
        setVisible(true);
    }
    public static void main(String[] args) {
        new Demo();
    }
}

修改
看起来这不会在JDK中修复。 This bug report结束时评论说“如果开发人员想让他们的窗口在屏幕上完全可见，他们应该考虑自己检查屏幕插图 [如下面的解决方案] ，然后重新开始以不同的方式布局它们的组件，或者在调用pack（）之后手动重新调整窗口大小，或者使用支持screen-insets的布局管理器 [与BorderLayout和GridBagLayout等更常见的不同。“

Answer 1

这基本上可以确保对话框“适合”指定的屏幕，方法是将其移动到指定设备的范围内并缩小它，使其左下边缘在指定设备的范围内。 / p>

这会查看设备边界和插图，以计算对话框可以驻留的“安全”区域。

public class TestScreenSize {

    public static void main(String[] args) {
        new TestScreenSize();
    }

    public TestScreenSize() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                Test test = new Test();
                test.setLayout(new BorderLayout());
                test.setVisible(true);
                System.exit(0);
            }
        });
    }

    public class Test extends JDialog {

        public Test() {
            setModal(true);
            setLocation(0, 0);
            setSize(2000, 2000);
        }

        @Override
        public void setBounds(int x, int y, int width, int height) {
            Rectangle bounds = getSafeScreenBounds(new Point(x, y));
            if (x < bounds.x) {
                x = bounds.x;
            }
            if (y < bounds.y) {
                y = bounds.y;
            }
            if (width > bounds.width) {
                width = (bounds.x + bounds.width) - x;
            }
            if (height > bounds.height) {
                height = (bounds.y + bounds.height) - y;
            }
            super.setBounds(x, y, width, height);
        }

    }

    public static Rectangle getSafeScreenBounds(Point pos) {

        Rectangle bounds = getScreenBoundsAt(pos);
        Insets insets = getScreenInsetsAt(pos);

        bounds.x += insets.left;
        bounds.y += insets.top;
        bounds.width -= (insets.left + insets.right);
        bounds.height -= (insets.top + insets.bottom);

        return bounds;

    }

    public static Insets getScreenInsetsAt(Point pos) {
        GraphicsDevice gd = getGraphicsDeviceAt(pos);
        Insets insets = null;
        if (gd != null) {
            insets = Toolkit.getDefaultToolkit().getScreenInsets(gd.getDefaultConfiguration());
        }
        return insets;
    }

    public static Rectangle getScreenBoundsAt(Point pos) {
        GraphicsDevice gd = getGraphicsDeviceAt(pos);
        Rectangle bounds = null;
        if (gd != null) {
            bounds = gd.getDefaultConfiguration().getBounds();
        }
        return bounds;
    }

    public static GraphicsDevice getGraphicsDeviceAt(Point pos) {

        GraphicsDevice device = null;

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice lstGDs[] = ge.getScreenDevices();

        ArrayList<GraphicsDevice> lstDevices = new ArrayList<GraphicsDevice>(lstGDs.length);

        for (GraphicsDevice gd : lstGDs) {

            GraphicsConfiguration gc = gd.getDefaultConfiguration();
            Rectangle screenBounds = gc.getBounds();

            if (screenBounds.contains(pos)) {

                lstDevices.add(gd);

            }

        }

        if (lstDevices.size() > 0) {
            device = lstDevices.get(0);
        } else {
            device = ge.getDefaultScreenDevice();
        }

        return device;

    }
}

Answer 2

好的，下面没有魔法，但是像max（a，b）一样简单：

import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Toolkit;

import javax.swing.JDialog;

public class Demo extends JDialog {
   public Demo() {
      super((Frame)null, "Demo" );
      setDefaultCloseOperation( DISPOSE_ON_CLOSE );

      Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      int width  = Math.min(    250, screenSize.width );
      int height = Math.min( 12_500, screenSize.height );
      pack();
      setSize( width, height );
      setVisible( true );
   }
   public static void main( String[] args ) {
      new Demo();
   }
}

Windows上的JDialog扩展到Windows任务栏。任何解决方法？

2 个答案: