Swingbuilder - application location centering_问答_开发者

Swingbuilder - application location centering

开发者 https://www.devze.com 2022-12-28 09:49 出处：网络

I am creating an application using Griffon->SwingBuilder. I would like to able to center the application on the desktop.

I know we have the 'location: [x,y]' argument we can provide on application creation. Is there anyway to access desktop properties to ca开发者_如何学Golculate the center?

For various reasons you cannot do it inline. Here is one way to center

import java.awt.*
import groovy.swing.*

sb = new SwingBuilder()
sb.build {
  f = frame(pack:true) {
      label "<html>" + (("This is a very long label."*3) + "<BR>")*5
  }
  Point cp = GraphicsEnvironment.localGraphicsEnvironment.centerPoint
  f.location = new Point((int)(cp.x - f.width), (int) (cp.y - f.height))
  f.show()
}

The reason you cannot set it in the attributes is that when the attributes are evaluated a child node has not yet been created or stored anywhere. One alternative is to set it as part of the child content block:

  frame(show:true) 
  {
      label "<html>" + (("This is a very long label."*3) + "<BR>")*5
      current.pack()
      Point cp = GraphicsEnvironment.localGraphicsEnvironment.centerPoint
      current.location = new Point((int)(cp.x -current.width/2), (int)(cp.y - current.height/2))
  }

(current is a meta-variable for the containing node).

One of Swing features is, that it remembers last position and size (if resizable)