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POImplementing back/forward buttons in Swing
 

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  1. POImplementing back/forward buttons in Swing
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    <p>I have a quick question. </p> <p>I'm getting a little bit of experience with Swing and the easiest way to do this was to draw up a reasonably big GUI.</p> <p>As part of the GUI, I want to have Forward and Back Buttons. The Approach I'm trying to take is to implement methods that will push the current JPanel to a stack and retrieve the previous value (Be that in a forwards or reverse direction (hence 2 stacks)). I can't get it to work though. Perhaps I'm going about it completely the wrong way or maybe a stack can't be used int the way I'm using it. In either case, it's really bugging me. I imagine there are probably easier ways like a card layout but I think this approach should work and that's what's so annoying.</p> <p>It may be worth noting that I'm using a JFrame "base class" and changing the central JPanel depending on the screen. The nav bar is constant as a part of the "base class" however</p> <p>The code of this "base class":</p> <pre><code>public class Main_Frame extends JFrame{ static JPanel nav_bar_panel; JButton home; JButton back; JButton forward; JPanel currentPanel; static Stack&lt;JPanel&gt; previousPanels; static Stack&lt;JPanel&gt; forwardPanels; public Main_Frame(){ super("DEMO"); setSize(800,600); setLayout(new BorderLayout()); setVisible(true); add(nav_bar(), BorderLayout.NORTH); currentPanel = init_display(); add(currentPanel, BorderLayout.CENTER); previousPanels = new Stack&lt;JPanel&gt;(); forwardPanels = new Stack&lt;JPanel&gt;(); } private JPanel nav_bar(){ ButtonPressHandler handler = new ButtonPressHandler(); nav_bar_panel = new JPanel(new FlowLayout(FlowLayout.LEFT, 10, 10)); back = new JButton("Back"); back.addActionListener(handler); home = new JButton("Home"); home.addActionListener(handler); forward = new JButton("Forward"); forward.addActionListener(handler); nav_bar_panel.add(back); nav_bar_panel.add(home); nav_bar_panel.add(forward); return nav_bar_panel; } private JPanel init_display(){ Home_Panel home_panel = new Home_Panel(); return home_panel; } public void change_display(JPanel myPanel){ invalidate(); remove(currentPanel); previousPanels.push(currentPanel); currentPanel = myPanel; add(currentPanel); validate(); } public void previous_display(){ if(!previousPanels.empty()){ invalidate(); remove(currentPanel); forwardPanels.push(currentPanel); currentPanel = previousPanels.pop(); add(currentPanel); validate(); } } public void forward_display(){ if(!forwardPanels.empty()){ invalidate(); remove(currentPanel); previousPanels.push(currentPanel); currentPanel = forwardPanels.pop(); add(currentPanel); validate(); } } private class ButtonPressHandler implements ActionListener { public void actionPerformed( ActionEvent event ) { if(event.getSource() == back){ previous_display(); System.out.print("You selected back"); } else if(event.getSource() == forward){ forward_display(); System.out.print("You selected forward"); } } // end method actionPerformed } // end private inner class TextFieldHandler } </code></pre>
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    1. COWhat is wrong with `CardLayout`?
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    2. COInstead of using two stacks, why not use a `List` containing all panels? Maintain an index pointing to the panel currently being shown. If the index is 0 then there are no previous panels. If it is size() - 1 then there are no next panels. This is of course assuming you want to create your own solution instead of using a `CardLayout`.
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      1. USJonas Kongslund
    3. COSounds good Jonas. I will probably switch to cardlayout once I get this going. I couldn't rest in the knowledge that I couldn't figure it out though :D
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