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Fix documentation of fl_overlay_clear and fl_overlay_rect

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The code example in fl_overlay_clear() wouldn't work.
This commit is contained in:
Albrecht Schlosser 2025-07-24 15:40:18 +02:00
parent 890f538bb5
commit b00ae1eee4
1 changed files with 7 additions and 7 deletions
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14
src/fl_overlay.cxx
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@ -97,26 +97,26 @@ void fl_overlay_clear() {
of the widget.
Your event handle should look similar to this (also see `test/mandelbrot.cxx`):
```
\code
int MyWidget::handle(int event) {
static int ix, iy;
switch (event) {
case FL_PUSH:
ix = Fl::event_x(); iy = Fl::event_y();
ix = Fl::event_x(); // ix defined as (private) class member
iy = Fl::event_y(); // iy defined as (private) class member
return 1;
case FL_DRAG:
this->make_current();
fl_overlay_rect(ix, iy, ix-Fl::event_x(), iy-Fl::event_y());
window()->make_current();
fl_overlay_rect(ix, iy, Fl::event_x() - ix, Fl::event_y() - iy);
return 1;
case FL_RELEASE:
this->make_current();
window()->make_current();
fl_overlay_clear();
// select the element under the rectangle
return 1;
}
return MySuperWidget::handle(event);
}
```
\endcode
\note Between drawing an overlay rect and clearing it, the content of the
widget must not change.