Java - Lock Aspect Ratio of JFrame
Is it possible to lock the aspect ratio of a JFrame in Java Swing?
For example, if my window is 200px by 200px, and the user wants to resize it, I want the ratio between the width and the height at 1:1, so that if开发者_如何学编程 the new width is 400px, the new height is forced to 400px.
I'm aware of ComponentListener
and componentResized
, but I'm having difficulty not getting it to go into an infinite loop of resizing, because I'm resizing the window in a resize listener.
Thanks!
I don't have a specific answer to your question, but I have often found that the way to avoid the "infinite loop of resizing" you talk about is to defer your call to resize the window:
boolean correctAspectRatio = ...; // check to see if new size meets aspect ratio requirements
if (!correctAspectRatio) {
final Frame _frame = this;
final int _width = ...; // calculated width
final int _height = ...; // calculated height
SwingUtilities.invokeLater(new Runnable(){
public void run() {
_frame.setSize(_width, _height);
}
});
}
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