David Ibbitson wrote:
> I'm just subclassing Fl_Double_Window and overriding the draw() method.
> My subclass is basically just a composite widget. I've been following
> the docs but the window just isn't being drawn correctly. Its just
> full of garbage, like the buffer hasnt been properly initialized.
> Here's the code:
>
>
>
> #include <FL/Fl.H>
> #include <FL/Fl_Double_Window.H>
> #include <FL/fl_draw.H>
>
> class mywin : public Fl_Double_Window {
>
> public:
>
> mywin(int x,int y,int w,int h,const char * label = 0)
> : Fl_Double_Window(x,y,w,h,label) {
> box(FL_THIN_UP_BOX);
> color(fl_rgb_color(190,192,190));
> }
>
> ~mywin() { }
>
> protected:
>
> void draw();
>
> };
>
> void mywin::draw() {
> Fl_Widget * const * a = array();
> if(damage() == FL_DAMAGE_CHILD) {
> for(int i = children(); i--; a++)
> update_child(**a);
> }
> else if(damage() == FL_DAMAGE_ALL) {
> draw_box(box(),color());
> for(int i = children(); i--; a++)
> draw_child(**a);
> }
> else if(damage() & (FL_DAMAGE_ALL | 1)) {
> // update area 1 ...
> }
> }
>
> int main(int argc, char ** argv) {
>
> mywin * w = new mywin(200,200,200,200,"mywin");
> w->end();
>
> w->show();
>
> return Fl::run();
> }
I think that in David's example, the window is filled with junk because
Fl_Double_Window::draw() is not called at the start of the mywin::draw()
function.
So try:
void mywin::draw() {
Fl_Double_Window::draw();
//Your code here
}
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