Resize JPanel from JFrame

Question

I want to create a little game in Java using Netbeans. For now I have a JFrame and two JPanels.
The JFrame contains both JPanels and a button. My intent is to click on this button and resize one of the JPanels (from 0 to >0 width).
Till now I menaged to resize the frame but I can't figure out how to resize the JPanel.
This is what I've done so far:

Structure frame |_ panel 1 |_ panel 2 |_ button __________________ | _ _ | | | | | | _| | | | | | | | | | | | | |>| | | | | | |_| | |_| |_| | |__________________| on click should expand frame and panel ______________________ | _ _____ | | | | | | _| | | | | | | | | | | | | |>| -> | | | | | |_| | |_| |_____| | |______________________|

This is the JPanel to resize

public class ToResize extends javax.swing.JPanel { ... public void resize(int width) { this.setSize(new Dimension(this.getWidth() + width, this.getHeight())); } }

This is the JFrame with the button

public class MyFrame extends javax.swing.JFrame { ... private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { if (panelToResize.getWidth() == 0) { panelToResize.resize(100); } else { panelToResize.resize(-100); } validate(); } }

mKorbel · Accepted Answer · 2011-07-12 15:33:58Z

1) if you'll resize JFrame too, then you have to call

a/ setPrefferedSize(getPrefferedSize()+-) for JFrame.pack();

b/ setPrefferedSize(getPrefferedSize()+-) for panelToResize and then call JFrame.pack();

2/ if you only change size betweens JPanels and JFrame size stays remained, then you have to call revalidate() plus repaint() to the panelToResize,

3/ but everything depends of used LayoutManager

Andrew Thompson · Accepted Answer · 2011-07-12 21:20:12Z

My intent is to click on this button and resize one of the JPanels (from 0 to >0 width).

Use a CardLayout, or a JSplitPane, or call panel.setVisible(boolean).

Eng.Fouad · Accepted Answer · 2011-07-12 15:28:04Z

0

Change setSize() to setPreferredSize()

answered Jul 12, 2011 at 15:28

Eng.Fouad

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Comments

Felype · Accepted Answer · 2013-04-30 13:29:17Z

I would do that same thing in a different way.

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { panelToResize.setVisible(!panelToResize.isVisible()); if(panelToResize.isVisible()) { jButton1.setText("<<"); } else { jButton1.setText(">>"); } }

Why?

1 - Hidden panel still work just like a visible one.

2 - Need to know rather the panel is extended or not? panelToResize.isVisible();

3 - The layout on your JFrame still works as intended.

Darin Kolev · Accepted Answer · 2013-03-06 21:31:45Z

-2

You can just use:

mainPanel.setResizeHorizontal(true); mainPanel.setResizeVertical(true)

and your problem will be solved.

edited Mar 6, 2013 at 21:31

Darin Kolev

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answered Mar 6, 2013 at 21:08

Bil.tor

1

1 Comment

Nathaniel Ford Over a year ago

Please clean up this answer; good grammar and English is useful, along with using the provided formatting tools - but in particular you should cite why this fixes the problem.

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