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POJSplitPane divider drag not working with complex layout
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  1. POJSplitPane divider drag not working with complex layout
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    copied!<p>I have a Java GUI program with a JSplitPane dividing the content. The left side of the JSplitPane is a JTabbedPane with a number of tabs - a very complex layout. When the left side reaches a certain level of complexity, dragging the divider to move the divider location no longer works, but I can still move the divider by explicitly setting the location. (If it matters, I am using Nimbus LAF.)</p> <p>It doesn't seem to be just the number of tabs on the left. Certain tabs that I include on the left make it stop working and others are OK. </p> <p>Has anyone ever run into this?</p> <p>I was able to work around it by adding a hack workaround method on my JSplitPane subclass.</p> <pre><code> public void enableDividerWorkaround() { javax.swing.plaf.basic.BasicSplitPaneUI l_ui = (javax.swing.plaf.basic.BasicSplitPaneUI) getUI(); BasicSplitPaneDivider l_divider = l_ui.getDivider(); l_divider.addMouseMotionListener(new MouseMotionAdapter() { @Override public void mouseDragged(MouseEvent e) { Dimension l_pane_size = getSize(); if (getOrientation() == JSplitPane.HORIZONTAL_SPLIT) { int l_new_loc = getDividerLocation() + e.getX(); if (l_new_loc &gt;= 0 &amp;&amp; l_new_loc &lt;= l_pane_size.width) { setDividerLocation(l_new_loc); } } else { int l_new_loc = getDividerLocation() + e.getY(); if (l_new_loc &gt;= 0 &amp;&amp; l_new_loc &lt;= l_pane_size.height) { setDividerLocation(l_new_loc); } } } }); } </code></pre> <p>UPDATE Here is the SSCCE (below). When I run this, the first time I drag the slider to the right, it "snaps" to the end of the long label and then remains fixed there. I believe it is triggered by the long label. If I shorten the label, I get more range of motion on the slider. So is it a bug, or the intended behavior?</p> <pre><code> public class SplitPaneTest extends javax.swing.JFrame { public SplitPaneTest() { initComponents(); } private void initComponents() { jSplitPane1 = new javax.swing.JSplitPane(); jLabel1 = new javax.swing.JLabel(); jPanel1 = new javax.swing.JPanel(); jLabel2 = new javax.swing.JLabel(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jSplitPane1.setDividerLocation(450); jSplitPane1.setName("jSplitPane1"); jLabel1.setText("right side"); jLabel1.setName("jLabel1"); jSplitPane1.setRightComponent(jLabel1); jPanel1.setName("jPanel1"); jLabel2.setText("left side asd adsf asdf asdf asdf sadf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdfa end"); jLabel2.setName("jLabel2"); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addContainerGap() .addComponent(jLabel2) .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addContainerGap() .addComponent(jLabel2) .addContainerGap(420, Short.MAX_VALUE)) ); jSplitPane1.setLeftComponent(jPanel1); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jSplitPane1) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jSplitPane1) ); pack(); } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new SplitPaneTest().setVisible(true); } }); } protected javax.swing.JLabel jLabel1; protected javax.swing.JLabel jLabel2; protected javax.swing.JPanel jPanel1; protected javax.swing.JSplitPane jSplitPane1; } </code></pre>
 

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