How to expand/shrink glcanvas (Jogl) if the user resizes the frame?

Question

I have a glcanvas inside a jpanel with a BorderLayout. The size of the canvas should be dependent on the window size. The initial size is set via

glCanvas.setSize(640, 480);

And it is added to the panel like this

jPanel3DModel.add(Model3DCanvas.getInstance().getCanvas());
jPanelRight.add(jPanel3DModel, BorderLayout.NORTH);

However the size of the canvas is fixed and all the panels of the other components in my frame just resize.

Answer 1

If you have to react to the JPanel resize "manually", you can use a ComponentListener as described in https://docs.oracle.com/javase/tutorial/uiswing/events/componentlistener.html

Assuming canvas is your GLCanvas and jpanel the component your canvas resizing is depending on.

jPanel.addComponentListener(new java.awt.event.ComponentAdapter() {
  public void componentResized(java.awt.event.ComponentEvent event) {
    int width=event.getComponent().getWidth();
    int height=event.getComponent().getHeight();
    canvas.setSize(width,height);
  }
});