Example usage for javax.swing JScrollPane getMouseWheelListeners

Introduction

In this page you can find the example usage for javax.swing JScrollPane getMouseWheelListeners.

Prototype

public synchronized MouseWheelListener[] getMouseWheelListeners() 

Source Link

Document

Returns an array of all the mouse wheel listeners registered on this component.

Usage

From source file:Main.java

public Main() {
    super(BoxLayout.Y_AXIS);
    glassPane.setOpaque(false);/*from   ww w  .j  ava  2s  . co  m*/
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
    for (int i = 0; i < 14000; i++) {
        DefaultMutableTreeNode node = new DefaultMutableTreeNode("Root" + i);
        node.add(new DefaultMutableTreeNode("Child" + i));
        root.add(node);
    }

    final JTree tree = new JTree(root);
    tree.setRootVisible(false);
    final JScrollPane pane = new JScrollPane(tree);
    add(pane);

    JButton button = new JButton("Expand");
    button.addActionListener(e -> {
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                TreePath[] paths = tree.getSelectionPaths();
                if (paths == null || paths.length == 0) {
                    glassPane.setVisible(false);
                    return;
                }
                tree.setSelectionPath(paths[0]);

                for (int i = 0; i < paths.length; i++) {
                    tree.expandPath(paths[i]);
                }
                glassPane.setVisible(false);
            }
        });
        getRootPane().setGlassPane(glassPane);
        glassPane.setVisible(true);
        t.start();
    });
    add(button);
    glassPane.addMouseWheelListener(e -> {
        for (MouseWheelListener mwl : pane.getMouseWheelListeners()) {
            mwl.mouseWheelMoved(e);
        }
    });
}

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