Java - 无法将窗口带到前面

Question

我正在尝试执行以下代码:

SwingUtilities.invokeLater(new Runnable() {
                            public void run() {
                                if (frame.getExtendedState() == Frame.ICONIFIED)
                                    frame.setExtendedState(Frame.NORMAL);
                                frame.getGlassPane().setVisible(!frame.getGlassPane().isVisible());

                                frame.toFront();
                                frame.repaint();

                            }
                        });

不幸的是,这并没有把它从其他窗户后面带到前面......任何解决方案？

Answer 1

根据API文档setExtendedState:

如果框架当前在屏幕上可见(Window.isShowing()方法返回true),开发人员应检查通过WindowStateListener接收的WindowEvent的WindowEvent.getNewState()方法的返回值,以确定该状态实际上是被改变了.

如果在屏幕上看不到帧,则可能生成也可能不生成事件.在这种情况下,开发人员可能会认为状态在此方法返回后立即更改.稍后,当调用setVisible(true)方法时,框架将尝试应用此状态.在这种情况下,也不保证接收任何WindowEvent.WINDOW_STATE_CHANGED事件.

但是,还有一个windowDeiconified可以挂钩的回调WindowListener:

SwingUtilities.invokeLater(new Runnable() {
  private final WindowListener l = new WindowAdapter() {
    @Override
    public void void windowDeiconified(WindowEvent e) {
      // Window now deiconified so bring it to the front.
      bringToFront();

      // Remove "one-shot" WindowListener to prevent memory leak.
      frame.removeWindowListener(this);
    }
  };

  public void run() {
    if (frame.getExtendedState() == Frame.ICONIFIED) {
      // Add listener and await callback once window has been deiconified.
      frame.addWindowListener(l);
      frame.setExtendedState(Frame.NORMAL);
    } else {
      // Bring to front synchronously.
      bringToFront();
    }
  }

  private void bringToFront() {
    frame.getGlassPane().setVisible(!frame.getGlassPane().isVisible());
    frame.toFront();
    // Note: Calling repaint explicitly should not be necessary.
  }
});