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How do I get a JComponent to resize after calling `setVisible(true)`?

Answer 1

A:

I've found a solution. You need to add/remove the components from the layout manager:

private void changerButtonActionPerformed(java.awt.event.ActionEvent evt) {        
        if (parent == null) {
            parent = view2D.getParent();
        }

        LayoutManager layoutMgr = parent.getLayout();

        if (mode2D) {
            System.out.println("Going from 2D to 3D");

            view2D.setVisible(false);
            layoutMgr.removeLayoutComponent(view2D);

            if (view3D != null) {
                view3D.setVisible(true);                
                if (layoutMgr != null && layoutMgr instanceof LayoutManager2) {
                    ((LayoutManager2) layoutMgr).addLayoutComponent(view3D, null);
                }

            } else {
                view3D = new JButton("3D View");
                view3D.addComponentListener(new MyListener("3D VIEW"));   
                parent.add(view3D);
            }

            ((JButton) evt.getSource()).setText("Change to 2D");
            mode2D = false;
        } else {
            System.out.println("Going from 3D to 2D");
            view3D.setVisible(false);
            layoutMgr.removeLayoutComponent(view3D);

            view2D.setVisible(true);            
            if (layoutMgr != null && layoutMgr instanceof LayoutManager2) {
                ((LayoutManager2) layoutMgr).addLayoutComponent(view2D, null);
            }

            ((JButton) evt.getSource()).setText("Change to 3D");
            mode2D = true;
        }
    }

iWerner 2010-04-22 10:55:43

That sounds overly complicated, it should be enough just to remove and add the components from/to 'parent'. Or use the CardLayoutManager suggested in the other reply.

fish 2010-04-22 13:46:12

Answer 2

+2 A:

Why don't you use a CardLayout to switch from the 2D to 3D component? CardLayout is exactly done for this kind of purpose in my understanding. Another benefit would be that it will simplify your code.

Matthieu BROUILLARD 2010-04-22 12:17:23

Card layout has tendency to keep the size of the biggest element, even if a smaller is displayed. It can be annoying if sizes are very different. However, this is based on what I remember, maybe I was doing something wrong when I tried it.

Gnoupi 2010-04-22 13:43:13

Yes but I guess it is a normal behaviour. I would not like to have my window redimensionned each time I switch from one view to another. Even if one component is smaller than another (in different cards I mean), I prefer either to center it or to stick it on top (or elsewhere).

Matthieu BROUILLARD 2010-04-22 14:35:38

Answer 3

+2 A:

After your remove() and add() methods to change the component, you should call:

parent.revalidate(); //To make the layout manager do its work.
parent.repaint(); //This could be necessary, to suggest a repaint of the panel

Javadoc for JComponent#revalidate() :

Supports deferred automatic layout.

Calls invalidate and then adds this component's validateRoot to a list of components that need to be validated. Validation will occur after all currently pending events have been dispatched. In other words after this method is called, the first validateRoot (if any) found when walking up the containment hierarchy of this component will be validated. By default, JRootPane, JScrollPane, and JTextField return true from isValidateRoot.

This method will automatically be called on this component when a property value changes such that size, location, or internal layout of this component has been affected. This automatic updating differs from the AWT because programs generally no longer need to invoke validate to get the contents of the GUI to update.

Gnoupi 2010-04-22 12:25:37

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How do I get a JComponent to resize after calling `setVisible(true)`?

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