gl4java-usergroup

[gl4java-usergroup] Re : JMenuItem over GLAnimCanvas

[Alban C. <aco...@wa...>]

I=92m not an expert about Java GUI components, but this question is =
often
asked on the mailing list (and we should add it to the FAQ).=20

=20

Here is what I understood :

=20

GLAnimCanvas is an awt and heavyweight component.

JMenus are swing and lightweight components.

Lightweight and heavyweight components don=92t mix properly, as
heavyweight components are always draw on top of lightweight components.
Thus, your menu opens behind your canvas.

So if you want to be able to display a menu over your OpenGL stuff, you
need to use a GLJPanel wich is lightweight. (It works, see the demo in
swingDemos/GLSwingDemoApplet for an exemple). The drawback is the
GLJPanel is not hardware accelerated, so you will lose performance over
GLAnimCanvas.

=20

You may have 2 other alternatives :

-         Use an awt menu wich should be heavyweight and should display
properly (I am not sure about this, you have to make a test. If you do
it, please let me know how it works).

-         Draw the menu yourself in OpenGL at the right place : see
MiscDemos\tessdemo.html for an exemple.

=20

Good day

=20

Alban Cousini=E9

=20

=20

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Re: [gl4java-usergroup] Re : JMenuItem over GLAnimCanvas

[guillaume D. <gui...@ne...>]

On Thu, 11 Jul 2002 09:51:58 +0200
"Alban Cousinie" <aco...@wa...> wrote:

> GLAnimCanvas is an awt and heavyweight component.
> 
> JMenus are swing and lightweight components.

> You may have 2 other alternatives :
> 
> -         Use an awt menu wich should be heavyweight and should display
> properly (I am not sure about this, you have to make a test. If you do
> it, please let me know how it works).
> 
> -         Draw the menu yourself in OpenGL at the right place : see
> MiscDemos\tessdemo.html for an exemple.

i read the example, it s not what i want.

using awt components worf fine in this way:

class GLTestMenu extends MenuBar
{

    /* liste des objets que je vais utiliser */
    Menu myMenuFile;
    Menu myMenuHelp;
    MenuItem myMenuItemAbout;


    /* constructor */
    GLTestMenu()
    {
	myMenuFile = new JMenu("File");
	this.add(myMenuFile);
	myMenuHelp = new Menu("Help");
	this.add(myMenuHelp);
	myMenuItemAbout = new MenuItem("About");
	myMenuHelp.add(myMenuItemAbout);
    }

    /* methodes */
}

but AWT Menu is not very beautifull compared to Swing.
i m trying another way with setDefaultLightWeightPopupEnabled(boolean) that Jiba
told. if it works and someone is interested, i'll post it.

thanks you two for your help,

-- 
guillaume