[gtk/synthetic-motion: 1/2] Add a function to request motion events
- From: Matthias Clasen <matthiasc src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/synthetic-motion: 1/2] Add a function to request motion events
- Date: Thu, 27 Aug 2020 11:23:29 +0000 (UTC)
commit 9978b821b11f35441e1a44e6d83b79bf2b0fd89b
Author: Matthias Clasen <mclasen redhat com>
Date: Fri Feb 21 16:38:36 2020 -0500
Add a function to request motion events
We want to ensure that the pointer position is reflected
when widget geometry changes, so add a function that tells
GDK "please create a motion event at the current position
on this surface, if one doesn't happen already".
gdk/gdksurface.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++-
gdk/gdksurfaceprivate.h | 4 ++++
2 files changed, 66 insertions(+), 1 deletion(-)
---
diff --git a/gdk/gdksurface.c b/gdk/gdksurface.c
index f89061a002..abee7ff1e4 100644
--- a/gdk/gdksurface.c
+++ b/gdk/gdksurface.c
@@ -2338,6 +2338,40 @@ gdk_drag_begin (GdkSurface *surface,
return GDK_SURFACE_GET_CLASS (surface)->drag_begin (surface, device, content, actions, dx, dy);
}
+static void
+gdk_surface_ensure_motion (GdkSurface *surface)
+{
+ GdkDisplay *display;
+ GdkSeat *seat;
+ GdkDevice *device;
+ GdkEvent *event;
+ double x, y;
+ GdkModifierType state;
+
+ if (!surface->request_motion)
+ return;
+
+ surface->request_motion = FALSE;
+
+ display = gdk_surface_get_display (surface);
+ seat = gdk_display_get_default_seat (display);
+ device = gdk_seat_get_pointer (seat);
+
+ if (!gdk_surface_get_device_position (surface, device, &x, &y, &state))
+ return;
+
+ event = gdk_motion_event_new (surface,
+ device,
+ NULL,
+ GDK_CURRENT_TIME,
+ state,
+ x, y,
+ NULL);
+
+ gdk_surface_handle_event (event);
+ gdk_event_unref (event);
+}
+
static void
gdk_surface_flush_events (GdkFrameClock *clock,
void *data)
@@ -2345,6 +2379,7 @@ gdk_surface_flush_events (GdkFrameClock *clock,
GdkSurface *surface = GDK_SURFACE (data);
_gdk_event_queue_flush (surface->display);
+ gdk_surface_ensure_motion (surface);
_gdk_display_pause_events (surface->display);
gdk_frame_clock_request_phase (clock, GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS);
@@ -2806,7 +2841,12 @@ gdk_surface_handle_event (GdkEvent *event)
}
else
{
- g_signal_emit (gdk_event_get_surface (event), signals[EVENT], 0, event, &handled);
+ GdkSurface *surface = gdk_event_get_surface (event);
+
+ if (gdk_event_get_event_type (event) == GDK_MOTION_NOTIFY)
+ surface->request_motion = FALSE;
+
+ g_signal_emit (surface, signals[EVENT], 0, event, &handled);
}
if (GDK_PROFILER_IS_RUNNING)
@@ -2815,6 +2855,27 @@ gdk_surface_handle_event (GdkEvent *event)
return handled;
}
+/*
+ * gdk_surface_request_motion:
+ * @surface: a #GdkSurface
+ *
+ * Request that the next frame cycle should deliver a motion
+ * event for @surface if the pointer is over it, regardless
+ * whether the pointer has moved or not. This is used by GTK
+ * after moving widgets around.
+ */
+void
+gdk_surface_request_motion (GdkSurface *surface)
+{
+ GdkFrameClock *frame_clock;
+
+ surface->request_motion = TRUE;
+
+ frame_clock = gdk_surface_get_frame_clock (surface);
+ if (frame_clock)
+ gdk_frame_clock_request_phase (frame_clock, GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS);
+}
+
/**
* gdk_surface_translate_coordinates:
* @from: the origin surface
diff --git a/gdk/gdksurfaceprivate.h b/gdk/gdksurfaceprivate.h
index 36db8286af..619b910321 100644
--- a/gdk/gdksurfaceprivate.h
+++ b/gdk/gdksurfaceprivate.h
@@ -72,6 +72,7 @@ struct _GdkSurface
guint frame_clock_events_paused : 1;
guint autohide : 1;
guint shortcuts_inhibited : 1;
+ guint request_motion : 1;
struct {
GdkGravity surface_anchor;
@@ -328,6 +329,9 @@ void gdk_surface_constrain_size (GdkGeometry *geometry,
int *new_width,
int *new_height);
+GDK_AVAILABLE_IN_ALL
+void gdk_surface_request_motion (GdkSurface *surface);
+
G_END_DECLS
#endif /* __GDK_SURFACE_PRIVATE_H__ */
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