Mouse Events on Disabled Buttons
Hi,
In my application I should make a disabled button to show a tool tip when mouse is entered onto it.
I'm using java.awt.container not Jcontainer.
I have searched in SDN forums and after reading some of the comments what I understood is disabled Swing button can react to Mouse events but a disabled awt button can not react to mouse events.
Is that true or did I not understand correctly?
And how would I be able to implement the required functionality in my
application?
Thanks.
[533 byte] By [
sunsdn123a] at [2007-11-27 11:14:28]
# 1
import java.awt.*;
import java.awt.event.*;
public class AwtTooltip {
private Panel getContent(Frame f) {
Button left = new Button("left");
left.setEnabled(false);
Button right = new Button("right");
Panel panel = new Panel(new GridBagLayout());
new TipManager(panel, f);
GridBagConstraints gbc = new GridBagConstraints();
gbc.weightx = 1.0;
panel.add(left, gbc);
panel.add(right, gbc);
return panel;
}
public static void main(String[] args) {
AwtTooltip test = new AwtTooltip();
Frame f = new Frame();
f.addWindowListener(closer);
f.add(test.getContent(f));
f.setSize(300,100);
f.setLocation(200,200);
f.setVisible(true);
}
private static WindowListener closer = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
}
class TipManager extends MouseMotionAdapter {
Panel component;
Window tooltip;
Label label;
public TipManager(Panel panel, Frame frame) {
component = panel;
panel.addMouseMotionListener(this);
initTooltip(frame);
}
/**
* Since enabled Buttons consume MouseEvents we will
* receive events sent only from disabled Buttons.
*/
public void mouseMoved(MouseEvent e) {
Point p = e.getPoint();
boolean hovering = false;
Component[] c = component.getComponents();
for(int j = 0; j < c.length; j++) {
Rectangle r = c[j].getBounds();
if(r.contains(p)) {
hovering = true;
if(!tooltip.isShowing())
showTooltip(c[j], p);
break;
}
}
if(!hovering && tooltip.isShowing()) {
tooltip.setVisible(false);
}
}
private void showTooltip(Component c, Point p) {
String text = ((Button)c).getLabel();
label.setText(text);
tooltip.pack();
convertPointToScreen(p, component);
tooltip.setLocation(p.x+10, p.y-15);
tooltip.setVisible(true);
}
/** Copied from SwingUtilities source code. */
public void convertPointToScreen(Point p, Component c) {
Rectangle b;
int x,y;
do {
if(c instanceof Window) {
try {
Point pp = c.getLocationOnScreen();
x = pp.x;
y = pp.y;
} catch (IllegalComponentStateException icse) {
x = c.getX();
y = c.getY();
}
} else {
x = c.getX();
y = c.getY();
}
p.x += x;
p.y += y;
if(c instanceof Window)
break;
c = c.getParent();
} while(c != null);
}
private void initTooltip(Frame owner) {
label = new Label();
label.setBackground(new Color(184,207,229));
tooltip = new Window(owner);
tooltip.add(label);
}
}
