有没有一种方法可以让多个jTextArea在Java-Netbeans中共享滚动窗格？

Question

Is there a way that a scrollpane from another jTextArea can control another jTextArea to scroll upwards and downwards?

They may not be the same in width but they will have the same lines of rows. If one jTextArea has more lines than the other then empty lines will be added to the second jTextArea to match them.

Answer 1

Assuming jScrollPane1 and jScrollPane2 are the 2 scrollpanes of your 2 jTextareas respectievley, with below code you can implement your requirements.

jScrollPane1 = new JScrollPane();
jTextArea1 = new JTextArea();
jScrollPane2 = new JScrollPane();
jTextArea2 = new JTextArea();

jScrollPane1.setViewportView(jTextArea1);
jScrollPane2.setViewportView(jTextArea2);
.
.
.
.

JScrollBar verticalScrollBar1 = jScrollPane1.getVerticalScrollBar();

verticalScrollBar1.addAdjustmentListener(new AdjustmentListener() {

     @Override
     public void adjustmentValueChanged(AdjustmentEvent e) {
            JScrollBar vertical = jScrollPane2.getVerticalScrollBar();
            vertical.setValue(e.getValue());
     }
});