StackOverflow2013

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POJava Swing GridBagLayout
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copied!<p>I am writing a Java gui to mimic some paperwork, in particular a form which has a number of "lines" only known at run-time, and the lines are either divided in two (50%-50%, a label and an entry) or divided 25% 75%, (let's say a number and a full sentence).</p> <p>One would think that having said (just showing the salient lines here, fuller code below)</p> <pre><code>GridBagConstraints c = new GridBagConstraints(); ... c.gridx = 0; c.gridwidth = 2; ... mainPanel.add(l, c); </code></pre> <p>followed by:</p> <pre><code>c.gridx = 2; c.gridwidth = 4; ... mainPanel.add(l, c); </code></pre> <p>would 'establish' that in the x direction, the panel is divided into 4, giving me my 50-50 which should leave me free to do this to get my 25%-75% version:</p> <pre><code>GridBagConstraints c = new GridBagConstraints(); ... c.gridx = 0; c.gridwidth = 1; ... mainPanel.add(l, c); </code></pre> <p>followed by:</p> <pre><code>c.gridx = 1; c.gridwidth = 3; ... mainPanel.add(l, c); </code></pre> <p>But what I get is all lines divided 50-50. I <em>was</em> able to get lines divided 50-50 and then others not divided, which was OK for a preliminary version. </p> <p>Have I mis-understood the way this works here? I note in the "Similar Questions" sidebar this post (http://stackoverflow.com/questions/7509781/java-gridbaglayout-automated-construction) recommending MiG layout, which I would consider seriously.</p> <p>Relevant code follows, the rest of the project was a standard empty NetBeans Java desktop application:</p> <pre><code>public class GridBagDemoView extends FrameView { public GridBagDemoView(SingleFrameApplication app) { super(app); initComponents(); // Reset the grid position nextGridY = 0; addLine_50_50("50", "50"); addLine_50_50("50", "50"); addLine_50_50("50", "50"); addLine_50_50("50", "50"); addLine_25_75("25", "75"); addLine_25_75("25", "75"); addLine_25_75("25", "75"); addLine_25_75("25", "75"); mainPanel.validate(); mainPanel.revalidate(); mainPanel.repaint(); } private void addLine_50_50(String left, String right) { GridBagConstraints c = new GridBagConstraints(); // "Universal" settings c.fill = GridBagConstraints.HORIZONTAL; c.insets = new Insets(5, 5, 5, 5); c.anchor = GridBagConstraints.NORTHWEST; c.gridheight = 1; c.weightx = 1; c.weighty = 1; // Settings for the labels (LHS of panel) JTextArea l = new JTextArea(); l.setText(left); c.gridx = 0; c.gridy = nextGridY; c.gridwidth = 2; c.weightx = 1; mainPanel.add(l, c); // Settings for the text (RHS of panel) JTextArea ta = new JTextArea(); ta.setText(right); c.gridx = 2; c.gridy = nextGridY; c.gridwidth = 2; c.weightx = 1; mainPanel.add(ta, c); // Increase row number of next line nextGridY++; } private void addLine_25_75(String left, String right) { GridBagConstraints c = new GridBagConstraints(); // "Universal" settings c.fill = GridBagConstraints.HORIZONTAL; c.insets = new Insets(5, 5, 5, 5); c.anchor = GridBagConstraints.NORTHWEST; c.gridheight = 1; c.weighty = 1; // Settings for the labels (LHS of panel) JTextArea l = new JTextArea(); l.setText(left); c.gridx = 0; c.gridy = nextGridY; c.gridwidth = 1; c.weightx = 1; mainPanel.add(l, c); // Settings for the lext (RHS of panel) JTextArea ta = new JTextArea(); ta.setText(right); c.gridx = 1; c.gridy = nextGridY; c.gridwidth = 3; c.weightx = 1; mainPanel.add(ta, c); // Increase row number of next line nextGridY++; } Generated code etc... </code></pre>

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