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How can JComboBox listene

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  How can JComboBox listene "RC" <rc@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: How can JComboBox lis "Tom Hawtin" <tom.hawtin@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: How can JComboBox lis phillip.s.powell@gmail.co.remove-dii-this - 2011-04-27 15:32 +0000

#1233 — How can JComboBox listene

  To: comp.lang.java.gui,comp.l

Since JComboBox and JButton both are
extends from JComponent.
When I addMouseListener(this);
for jButton, it listens to the MouseEvent.
But jComboBox doesn't listen to the MouseEvent.

public void mouseEntered(MouseEvent me) {
	System.out.println("mouse entered");
         jComboBox.setToolTipText("mouse entered"); // not work
         jButton.setToolTipText("mouse entered button"); // works fine
}

mouseEntered just move your mouse pointer on
the object, no need to click (pressed and released).

I just want to detect the mouse entered on JComboBox
(i.e. popup a ToolTip) before I click it for select an item.

Do I miss something? Do I need to setXXX and/or enableXXX
JComboBox before I addMouseListener?

Thank Q for your help!

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#1234 — Re: How can JComboBox lis

  To: comp.lang.java.gui,comp.l
RC wrote:
> 
> Since JComboBox and JButton both are
> extends from JComponent.
> When I addMouseListener(this);
> for jButton, it listens to the MouseEvent.
> But jComboBox doesn't listen to the MouseEvent.

JComboBox is implemented as a number of components (a text field, the 
button and the container for them both). If you add a low level listener 
to the container, it wont receive the events of its children.

Oddly, mouse events do bubble up if the child has no mouse listeners. 
Unfortunately if you add mouse listeners recursively, you might end up 
preventing events bubbling up that the PL&F expects.

As an alternative, you can either push an EventQueue and filter through 
dispatched events, or add an AWTEventListener through Toolkit.

But probably what you want to do is reconsider what you were doing in 
the first place.

Tom Hawtin

[Followup-To: comp.lang.java.gui]

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#1259 — Re: How can JComboBox lis

  To: comp.lang.java.gui,comp.l
On Mar 19, 4:29 pm, RC <raymond.c...@nospam.noaa.gov> wrote:
> Since JComboBox and JButton both are
> extends from JComponent.
> When I addMouseListener(this);
> for jButton, it listens to the MouseEvent.
> But jComboBox doesn't listen to the MouseEvent.
>
> public void mouseEntered(MouseEvent me) {
>         System.out.println("mouse entered");
>          jComboBox.setToolTipText("mouse entered"); // not work
>          jButton.setToolTipText("mouse entered button"); // works fine
>
> }
>
> mouseEntered just move your mouse pointer on
> the object, no need to click (pressed and released).
>
> I just want to detect the mouse entered on JComboBox
> (i.e. popup a ToolTip) before I click it for select an item.
>
> Do I miss something? Do I need to setXXX and/or enableXXX
> JComboBox before I addMouseListener?
>
> Thank Q for your help!

I am not thinking that you'd want a MouseListener for the JComboBox,
but instead consider a PopupMenuListener instead, chances are that
will give you the results you want within the JComboBox.

Phil

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