diff options
| -rw-r--r-- | ui/gtk.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/ui/gtk.c b/ui/gtk.c index 7ce73b0798..93b13b7a30 100644 --- a/ui/gtk.c +++ b/ui/gtk.c @@ -891,7 +891,7 @@ static gboolean gd_motion_event(GtkWidget *widget, GdkEventMotion *motion, int x, y; int mx, my; int fbh, fbw; - int ww, wh, ws; + int ww, wh; if (!vc->gfx.ds) { return TRUE; @@ -899,11 +899,15 @@ static gboolean gd_motion_event(GtkWidget *widget, GdkEventMotion *motion, fbw = surface_width(vc->gfx.ds) * vc->gfx.scale_x; fbh = surface_height(vc->gfx.ds) * vc->gfx.scale_y; - ww = gtk_widget_get_allocated_width(widget); wh = gtk_widget_get_allocated_height(widget); - ws = gtk_widget_get_scale_factor(widget); + /* + * `widget` may not have the same size with the frame buffer. + * In such cases, some paddings are needed around the `vc`. + * To achieve that, `vc` will be displayed at (mx, my) + * so that it is displayed at the center of the widget. + */ mx = my = 0; if (ww > fbw) { mx = (ww - fbw) / 2; @@ -912,8 +916,12 @@ static gboolean gd_motion_event(GtkWidget *widget, GdkEventMotion *motion, my = (wh - fbh) / 2; } - x = (motion->x - mx) / vc->gfx.scale_x * ws; - y = (motion->y - my) / vc->gfx.scale_y * ws; + /* + * `motion` is reported in `widget` coordinates + * so translating it to the coordinates in `vc`. + */ + x = (motion->x - mx) / vc->gfx.scale_x; + y = (motion->y - my) / vc->gfx.scale_y; trace_gd_motion_event(ww, wh, gtk_widget_get_scale_factor(widget), x, y); |