I haven't looked at Cobalt, but I imagine the procedure is the same: 1) In your frmOpenEvent, draw the form via FrmDrawForm, then draw your bitmap, and return true.
2) In your frmUpdateEvent, do the exact same thing. If you do not return true, the system will call FrmDrawForm and any custom drawing you have done will be erased. --- Tim Kostka "ye vicky" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Hi, > > It's really a naive questions, but why I just cannot manage it. > > I'm using develop suit, writing codes for Palm Cobalt system. > I want to draw a bitmap whenever the form is drawn. How do I approach > it? So far I know from creating a form bitmap element resource can > draw a bitmap when the form is drawn. But I don't want that way. > Because the bitmap being displayed will be a dynamic image. So, must > there some other ways can do it. > > By now, I made a drawing method which is used to draw a bitmap. The > method is functionable. It can be called and draw bitmap in other > forms. I don't know what is the problem, I guess maybe I did not > handle the correct event. > I don't know how many event will be generated after FrmGotoForm() > function. > But it seems quite a lot of them. So far I know after FrmGotoForm(), > will at least generate, frmLoadEvent, frmOpenEvent, frmUpdateEvent, > winUpdateEvent, winResizedEvent. Because I tried to call the drawing > method under each of them, I can see the program did run the method > but nothing is drawn. Only when I responsed to winResizedEvent, I saw > the bitmap flashed once and soon disappeared. And Palm OS Reporter > tool gives a debug message: > [Form] PrvDrawFormTab: Drawing list outside an update!\n > > The form I created to draw the bitmap is a traditional form. And the > form is empty(no elements created in the form). > I know for this kinds of form there is a gc created and stored in the > back buffer. So, I also guess, is it because I did not draw the bitmap > to back buffer, so once the form is redrawn, the bitmap is overwrited? > If it is the point, then how do I write to back buffer? > > And also I don't understand, why there are so many event generated > after FrmGotoForm(), and why the form was drawn several times since no > action to the form at all after the form is fist time opened? > > I'm very new to Palm, and this is the only place I found can get some > help, so pls forgive my so many naive questions. > > Thanks > -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
