tooltip

[zhouhao]

Hi,

How can I add a tooltip when I move the mouse in my applet?

I'm using awt.

Thanks,

Zhou

[Chris Birkett]

You need to create an instance of the Window class. This creates a window
without any title bar or border.

"zhouhao" <zhouhao@csksoftware.com> wrote:
>
>Hi,
>
>How can I add a tooltip when I move the mouse in my applet?
>
>I'm using awt.
>
>Thanks,
>
>Zhou

[Rajesh]

Dear zhouhao,
Here is the code that you are searching for.
Test these 2 files. and let me know the result.
You can use these for awt as well as for applets.
Thank you very much.
Cheers.

======================
ToolTip.java

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class ToolTip extends Canvas {

protected String tip;
protected Component owner;

private Container mainContainer;
private LayoutManager mainLayout;

private boolean shown;

private final int VERTICAL_OFFSET = 30;
private final int HORIZONTAL_ENLARGE = 10;

public ToolTip(String tip, Component owner) {
this.tip = tip;
this.owner = owner;
owner.addMouseListener(new MAdapter());
setBackground(new Color(255,255,220));
}


public void paint(Graphics g) {
g.drawRect(0,0,getSize().width -1, getSize().height -1);
g.drawString(tip, 3, getSize().height - 3);
}

private void addToolTip() {
mainContainer.setLayout(null);

FontMetrics fm = getFontMetrics(owner.getFont());
setSize(fm.stringWidth(tip) + HORIZONTAL_ENLARGE, fm.getHeight());

setLocation((owner.getLocationOnScreen().x -
mainContainer.getLocationOnScreen().x) ,
(owner.getLocationOnScreen().y - mainContainer.getLocationOnScreen().y
+ VERTICAL_OFFSET));

// correction, whole tool tip must be visible
if (mainContainer.getSize().width < ( getLocation().x + getSize().width ))
{
setLocation(mainContainer.getSize().width - getSize().width,
getLocation().y);
}
mainContainer.add(this, 0);
mainContainer.validate();
repaint();
shown = true;
}


private void removeToolTip() {
if (shown) {
mainContainer.remove(0);
mainContainer.setLayout(mainLayout);
mainContainer.validate();
}
shown = false;
}

private void findMainContainer() {
Container parent = owner.getParent();
while (true) {
if ((parent instanceof Applet) || (parent instanceof Frame)) {
mainContainer = parent;
break;
} else {
parent = parent.getParent();
}
}
mainLayout = mainContainer.getLayout();
}

class MAdapter extends MouseAdapter {
public void mouseEntered(MouseEvent me) {
findMainContainer();
addToolTip();
}
public void mouseExited(MouseEvent me) {
removeToolTip();
}
public void mousePressed(MouseEvent me) {
removeToolTip();
}
}
}
======================
/*
<applet code="ToolTipTest.class" width=300 height=300></applet>

*/

import java.awt.*;
import java.awt.event.*;

public class ToolTipTest extends java.applet.Applet {

private Label myLabel;
private Button myButton;
private TextField myTextField;

public void init() {

myLabel = new Label("Hello world!");
new ToolTip("I say: Hello world!", myLabel);

myButton = new Button("Press");
new ToolTip("It's working !", myButton);

myTextField = new TextField(10);
new ToolTip("Tip for this field", myTextField);

add(myLabel);
add(myButton);
add(myTextField);
}
}




======================
"zhouhao" <zhouhao@csksoftware.com> wrote in message
news:3c0f294e$1@147.208.176.211...
>
> Hi,
>
> How can I add a tooltip when I move the mouse in my applet?
>
> I'm using awt.
>
> Thanks,
>
> Zhou