如何在中心屏幕中定位表单？ [英] How to position the form in the center screen?

问题描述

我是一名.Net开发人员，但不知怎的，我的任务是在java中创建一个简单的应用程序，原因有些。我能够创建该应用程序，但我的问题是如何在应用程序启动时将窗体置于屏幕中心？

I'm a .Net developer but somehow I was task to create a simple application in java for some extra reason. I was able to create that application but my problem is how can i center the form in the screen when the application is launched?

这是我的代码：

private void formWindowActivated(java.awt.event.WindowEvent evt) 
{
        // Get the size of the screen
        Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();

        // Determine the new location of the window
        int w = this.getSize().width;
        int h = this.getSize().height;
        int x = (dim.width-w)/2;
        int y = (dim.height-h)/2;

        // Move the window
        this.setLocation(x, y);
}

上面的代码工作正常，但问题是我看到表单正在移动从最顶部到中心屏幕。我还尝试在 formWindowOpened 事件中添加该代码，但仍显示相同的操作。有更好的方法吗？就像在 .NET Application 中一样，有一个 CenterScreen Position 。或者，如果上面的代码是正确的，我将把它放在什么事件上？

The code above works fine but the problem is I've seen the form moving from the topleft most to center screen. I also tried adding that code in formWindowOpened event and still shows same action. Is there a better way for this? Just like in .NET Application there is a CenterScreen Position. Or if the code above is correct, on what Event will i put it?

感谢您阅读本文。

推荐答案

在JFrame上调用pack之后，只需设置相对于null的位置即可。

Simply set location relative to null after calling pack on the JFrame, that's it.

例如，

  JFrame frame = new JFrame("FooRendererTest");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.getContentPane().add(mainPanel); // or whatever...
  frame.pack();
  frame.setLocationRelativeTo(null);  // *** this will center your app ***
  frame.setVisible(true);

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