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gtk/gesturestylus: Convert motion history from surface coordinates

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Motion history coordinates are based on GdkSurface coordinates. Transform
the coordinates from the GtkNative they are received on, accounting for the
possible transforms (e.g. due to window borders and shadows).

Fixes: https://gitlab.gnome.org/GNOME/gtk/-/issues/3491
This commit is contained in:
Carlos Garnacho 2020-12-24 19:55:39 +01:00
parent 7e579bb59a
commit cf20cfd31e
1 changed files with 10 additions and 3 deletions
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13
gtk/gtkgesturestylus.c
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@ -35,6 +35,7 @@
#include "gtkintl.h"
#include "gtkmarshalers.h"
#include "gtkmain.h"
#include "gtknative.h"
G_DEFINE_TYPE (GtkGestureStylus, gtk_gesture_stylus, GTK_TYPE_GESTURE_SINGLE)
@ -319,6 +320,8 @@ gtk_gesture_stylus_get_backlog (GtkGestureStylus *gesture,
GArray *backlog_array;
GdkTimeCoord *history = NULL;
guint n_coords = 0, i;
double surf_x, surf_y;
GtkNative *native;
g_return_val_if_fail (GTK_IS_GESTURE_STYLUS (gesture), FALSE);
g_return_val_if_fail (backlog != NULL && n_elems != NULL, FALSE);
@ -331,6 +334,9 @@ gtk_gesture_stylus_get_backlog (GtkGestureStylus *gesture,
if (!history)
return FALSE;
native = gtk_widget_get_native (gtk_get_event_widget (event));
gtk_native_get_surface_transform (native, &surf_x, &surf_y);
backlog_array = g_array_new (FALSE, FALSE, sizeof (GdkTimeCoord));
for (i = 0; i < n_coords; i++)
{
@ -339,10 +345,11 @@ gtk_gesture_stylus_get_backlog (GtkGestureStylus *gesture,
g_array_append_val (backlog_array, *time_coord);
time_coord = &g_array_index (backlog_array, GdkTimeCoord, backlog_array->len - 1);
if (gtk_widget_compute_point (gtk_get_event_widget (event),
if (gtk_widget_compute_point (GTK_WIDGET (native),
gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)),
&GRAPHENE_POINT_INIT (time_coord->axes[GDK_AXIS_X],
time_coord->axes[GDK_AXIS_Y]),
&GRAPHENE_POINT_INIT (time_coord->axes[GDK_AXIS_X] - surf_x,
time_coord->axes[GDK_AXIS_Y] - surf_y),
&p))
{
time_coord->axes[GDK_AXIS_X] = p.x;