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gtk: Properly calculate device offset for DnD

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We need to take the device scale into account, like it is done in
gdkwindow.c.

This fixes wrongly placed DnD surfaces in scaled contexts on X11
as well as Wayland.
This commit is contained in:
Robert Mader
2019-09-22 15:58:28 +02:00
parent 5d23819c69
commit 77e0d83000
5 changed files with 17 additions and 7 deletions
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4
tests/testlist3.c
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@ -14,6 +14,7 @@ drag_begin (GtkWidget *widget,
cairo_surface_t *surface;
cairo_t *cr;
int x, y;
double sx, sy;
row = gtk_widget_get_ancestor (widget, GTK_TYPE_LIST_BOX_ROW);
gtk_widget_get_allocation (row, &alloc);
@ -25,7 +26,8 @@ drag_begin (GtkWidget *widget,
gtk_style_context_remove_class (gtk_widget_get_style_context (row), "drag-icon");
gtk_widget_translate_coordinates (widget, row, 0, 0, &x, &y);
cairo_surface_set_device_offset (surface, -x, -y);
cairo_surface_get_device_scale (surface, &sx, &sy);
cairo_surface_set_device_offset (surface, -x * sy, -y * sy);
gtk_drag_set_icon_surface (context, surface);
cairo_destroy (cr);