java 中开窗
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Center Swing Windows
提问by Travis
I'm developing a Java Swing application. How can I make it so that when the program itself and any other windows open they come up in the center of the screen?
我正在开发 Java Swing 应用程序。我怎样才能让程序本身和任何其他窗口打开时它们出现在屏幕中央？
回答by camickr
frame.setLocationRelativeTo( null );
回答by Rehan Farooq
frame.setLocationRelativeTo(null); make the frame open in cetner
frame.setLocationRelativeTo(null); 使框架在中心打开
Regards, Rehan Farooq
问候， Rehan Farooq
回答by Saji
It is easy if you are using Netbeans. In property window of JFrame go to "Code" tab.There is an option as "Generate center".Check that option. JFrame will display in center.
如果您使用 Netbeans，这很容易。在 JFrame 的属性窗口中，转到“代码”选项卡。有一个选项为“生成中心”。检查该选项。JFrame 将显示在中心。
回答by Jules Olléon
You'll have to do it by hand, using setLocation(x,y).
您必须手动完成，使用setLocation(x,y).
Something like:
就像是：
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLocation((dim.width-frameWidth)/2, (dim.height-frameHeight)/2);
should do it (not tested).
应该这样做（未测试）。
回答by Taisin
Doing it by hand in multi-screen environment gives something like this (static, 'cause you probably would want it in a utility class):
在多屏幕环境中手动执行会给出类似的结果（静态，因为您可能希望在实用程序类中使用它）：
public static Rectangle getScreenBounds(Component top){
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] gd = ge.getScreenDevices();
if (top != null){
Rectangle bounds = top.getBounds();
int centerX = (int) bounds.getCenterX();
int centerY = (int) bounds.getCenterY();
for (GraphicsDevice device : gd){
GraphicsConfiguration gc = device.getDefaultConfiguration();
Rectangle r = gc.getBounds();
if (r.contains(centerX, centerY)){
return r;
}
}
}
return gd[0].getDefaultConfiguration().getBounds();
}
public void centerWindowOnScreen(Window windowToCenter){
Rectangle bounds = getScreenBounds(windowToCenter);
Point newPt = new Point(bounds.x + bounds.width / 2, bounds.y + bounds.height / 2);
Dimension componentSize = windowToCenter.getSize();
newPt.x -= componentSize.width / 2;
newPt.y -= componentSize.height / 2;
windowToCenter.setLocation(newPt);
}
As for default button, it's JDialog.getRootPane().setDefaultButton(btn), but button has to be already added to the dialog, and visible.
至于默认按钮，它是JDialog.getRootPane().setDefaultButton(btn)，但按钮必须已经添加到对话框中，并且是可见的。
