swing模仿web锚点效果 博客分类： swing SwingWeb

 

import java.awt.BorderLayout;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

/**
 *
 * @author Administrator
 */
public class TestScroll extends JFrame {

    private JButton[] buttons = new JButton[100];
    private JScrollPane js = new JScrollPane();

    public TestScroll() {
        init();
    }

    private void init() {
        setTitle("swing模仿web锚点效果");
        setSize(300, 300);
        setLocationRelativeTo(this);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());
        JSplitPane jSplitPane = new JSplitPane();
        jSplitPane.setDividerLocation(140);
        jSplitPane.setLeftComponent(getTree());
        jSplitPane.setRightComponent(getPanel());
        this.add(jSplitPane);
    }

    private JScrollPane getPanel() {
        JPanel jpanel = new JPanel();
        jpanel.setLayout(new BoxLayout(jpanel, BoxLayout.Y_AXIS));
        for (int i = 0; i < 100; i++) {
            JButton button = new JButton("button" + i);
            jpanel.add(button);
            buttons[i] = button;
        }
        js.setViewportView(jpanel);
        return js;
    }

    private JScrollPane getTree() {
        JScrollPane scroll = new JScrollPane();
        final JTree tree = new JTree();
        DefaultMutableTreeNode node = new DefaultMutableTreeNode("序号");
        for (int i = 0; i < 100; i++) {
            node.add(new DefaultMutableTreeNode(i));
        }
        DefaultTreeModel tmode = new DefaultTreeModel(node);
        tree.setModel(tmode);
        tree.addTreeSelectionListener(new TreeSelectionListener() {

            @Override
            public void valueChanged(TreeSelectionEvent e) {
                //关键代码
                String path = tree.getLastSelectedPathComponent().toString();
                int y = 0;
                try {
                    y = Integer.parseInt(path);
                } catch (NumberFormatException n) {
                    //do Nothing
                }
                JScrollBar bar = js.getVerticalScrollBar();
                bar.setValue(buttons[y].getY());
            }
        });
        scroll.setViewportView(tree);
        return scroll;
    }

    public static void main(String[] args) {
        TestScroll t = new TestScroll();
        t.setVisible(true);
    }
}

截图: