tooltipshack.java

oraily的Swing hacks code

import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;

public class ToolTipsHack {
    
    public static void main(String[] args) {
        RepaintManager.setCurrentManager(new FullRepaintManager());
		System.out.println(" light = " + ToolTipManager.sharedInstance().isLightWeightPopupEnabled());
		ToolTipManager.sharedInstance().setLightWeightPopupEnabled(true);
		System.out.println(" light = " + ToolTipManager.sharedInstance().isLightWeightPopupEnabled());

        JButton button;
        
        
        JFrame frame = new JFrame("Tool Tips Hack");
        BoxLayout layout =  new BoxLayout(
            frame.getContentPane(),
            BoxLayout.Y_AXIS);
        frame.getContentPane().setLayout(layout);
        
        button = new CustomJButton();
        button.setText("Open");
        button.setToolTipText("Open an existing file");
        frame.getContentPane().add(button);
        
        button = new CustomJButton();
        button.setText("Save");
        button.setToolTipText("Save the currently open file");
        frame.getContentPane().add(button);
        
        
        frame.getContentPane().add(new JLabel("a label"));
        frame.getContentPane().add(new JLabel("a label"));
        frame.getContentPane().add(new JLabel("a label"));
        
        
        frame.pack();
		frame.setSize(400,400);
        frame.show();
		System.out.println(" light = " + ToolTipManager.sharedInstance().isLightWeightPopupEnabled());
    }
    
    
}

class CustomJButton extends JButton {
    JToolTip _tooltip;
    
    public CustomJButton() {
        _tooltip = new CustomToolTip();
        _tooltip.setComponent(this);
		System.out.println("tooltip = " + _tooltip);
		System.out.println(" tooltip = " + _tooltip.isLightweight());
    }
    
    public JToolTip createToolTip() {
        return _tooltip;
    }
    
}

class CustomToolTip extends JToolTip {
    public CustomToolTip() {
        super();
        this.setOpaque(false);
		System.out.println("light = " + this.isLightweight());
		System.out.println(" light  x = " + ToolTipManager.sharedInstance().isLightWeightPopupEnabled());
    }
    
    public Dimension getPreferredSize() {
        Dimension dim = super.getPreferredSize();
        return new Dimension((int)dim.getWidth()+20,(int)dim.getHeight()+20);
    }
    public void paintComponent(Graphics g) {
        // set the parent opaque
        Component parent = this.getParent();
        if(parent != null) {
            if(parent instanceof JComponent) {
                JComponent jparent = (JComponent)parent;
                if(jparent.isOpaque()) {
                    jparent.setOpaque(false);
                }
            }
        }
        
        // create a round rectangle
        Shape round = new RoundRectangle2D.Float(4,4,
            this.getWidth()-1-8,
            this.getHeight()-1-8,
            15,15);
        
        // draw the white background
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(Color.white);
        g2.fill(round);
        
        // draw the gray border
        g2.setColor(Color.gray);
        g2.setStroke(new BasicStroke(5));
        g2.draw(round);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_DEFAULT);
        
        // draw the text
        String text = this.getComponent().getToolTipText();
        if(text != null) {
            FontMetrics fm = g2.getFontMetrics();
            int h = fm.getAscent();
            g2.setColor(Color.black);
            g2.drawString(text,10,(this.getHeight()+h)/2);
        }
        
    }
    
    public void setToolTipText(String str) {
        super.setToolTipText(str);
        System.out.println("set tooltip text called");
    }
}