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Handle shift + mousewheel event on Wayland (STR 3521)

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Pressing the shift key while using the mousewheel changes
horizontal to vertical scrolling and vice versa. This allows users
with a standard mouse with only one scrollwheel to use it for both
scrolling directions.

This concludes "handling shift + mousewheel" for all supported platforms.
This commit is contained in:
Albrecht Schlosser 2023-08-14 16:56:24 +02:00
parent 847901623a
commit 3c7610ec23
1 changed files with 15 additions and 5 deletions
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20
src/drivers/Wayland/Fl_Wayland_Screen_Driver.cxx
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@ -344,16 +344,26 @@ static void pointer_axis(void *data,
if (!win) return;
wld_event_time = time;
int delta = wl_fixed_to_int(value) / 10;
//fprintf(stderr, "FL_MOUSEWHEEL: %c delta=%d\n", axis==WL_POINTER_AXIS_HORIZONTAL_SCROLL?'H':'V', delta);
// fprintf(stderr, "FL_MOUSEWHEEL: %c delta=%d\n", axis==WL_POINTER_AXIS_HORIZONTAL_SCROLL?'H':'V', delta);
// allow both horizontal and vertical movements to be processed by the widget
if (axis == WL_POINTER_AXIS_HORIZONTAL_SCROLL) {
Fl::e_dx = delta;
Fl::e_dy = 0;
if (Fl::event_shift()) { // shift key pressed: send vertical mousewheel event
Fl::e_dx = 0;
Fl::e_dy = delta;
} else { // shift key not pressed (normal behavior): send horizontal mousewheel event
Fl::e_dx = delta;
Fl::e_dy = 0;
}
Fl::handle(FL_MOUSEWHEEL, win->top_window());
}
if (axis == WL_POINTER_AXIS_VERTICAL_SCROLL) {
Fl::e_dx = 0;
Fl::e_dy = delta;
if (Fl::event_shift()) { // shift key pressed: send horizontal mousewheel event
Fl::e_dx = delta;
Fl::e_dy = 0;
} else {// shift key not pressed (normal behavior): send vertical mousewheel event
Fl::e_dx = 0;
Fl::e_dy = delta;
}
Fl::handle(FL_MOUSEWHEEL, win->top_window());
}
}