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display: Add meta_display_is_pointer_emulating_sequence()
This function tells the obvious on X11, and implements a similar mechanism on wayland to determine the "pointer emulating" sequence, or one to stick with when implementing single-touch behavior. https://bugzilla.gnome.org/show_bug.cgi?id=733631
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@ -253,6 +253,7 @@ struct _MetaDisplay
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MetaCompositor *compositor;
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MetaGestureTracker *gesture_tracker;
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ClutterEventSequence *pointer_emulating_sequence;
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int composite_event_base;
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int composite_error_base;
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@ -3239,3 +3239,23 @@ meta_display_request_restart (MetaDisplay *display)
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return result;
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}
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/**
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* meta_display_is_pointer_emulating_sequence:
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* @display: the display
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* @sequence: (nullable): a #ClutterEventSequence
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*
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* Tells whether the event sequence is the used for pointer emulation
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* and single-touch interaction.
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*
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* Returns: #TRUE if the sequence emulates pointer behavior
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**/
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gboolean
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meta_display_is_pointer_emulating_sequence (MetaDisplay *display,
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ClutterEventSequence *sequence)
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{
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if (!sequence)
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return FALSE;
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return display->pointer_emulating_sequence == sequence;
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}
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@ -99,6 +99,62 @@ handle_idletime_for_event (const ClutterEvent *event)
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#endif /* HAVE_NATIVE_BACKEND */
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}
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static gboolean
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sequence_is_pointer_emulated (MetaDisplay *display,
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const ClutterEvent *event)
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{
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ClutterEventSequence *sequence;
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MetaBackend *backend;
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sequence = clutter_event_get_event_sequence (event);
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if (!sequence)
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return FALSE;
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if (clutter_event_is_pointer_emulated (event))
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return TRUE;
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backend = meta_get_backend ();
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/* When using Clutter's native input backend there is no concept of
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* pointer emulating sequence, we still must make up our own to be
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* able to implement single-touch (hence pointer alike) behavior.
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*
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* This is implemented similarly to X11, where only the first touch
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* on screen gets the "pointer emulated" flag, and it won't get assigned
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* to another sequence until the next first touch on an idle touchscreen.
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*/
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if (META_IS_BACKEND_NATIVE (backend))
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{
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MetaGestureTracker *tracker;
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tracker = meta_display_get_gesture_tracker (display);
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if (event->type == CLUTTER_TOUCH_BEGIN &&
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meta_gesture_tracker_get_n_current_touches (tracker) == 0)
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return TRUE;
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}
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return FALSE;
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}
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static void
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meta_display_update_pointer_emulating_sequence (MetaDisplay *display,
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const ClutterEvent *event)
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{
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ClutterEventSequence *sequence;
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sequence = clutter_event_get_event_sequence (event);
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if (event->type == CLUTTER_TOUCH_BEGIN &&
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!display->pointer_emulating_sequence &&
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sequence_is_pointer_emulated (display, event))
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display->pointer_emulating_sequence = sequence;
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else if (event->type == CLUTTER_TOUCH_END &&
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display->pointer_emulating_sequence == sequence)
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display->pointer_emulating_sequence = NULL;
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}
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static gboolean
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meta_display_handle_event (MetaDisplay *display,
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const ClutterEvent *event)
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@ -108,6 +164,8 @@ meta_display_handle_event (MetaDisplay *display,
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MetaWaylandCompositor *compositor = NULL;
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MetaGestureTracker *tracker;
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meta_display_update_pointer_emulating_sequence (display, event);
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if (meta_is_wayland_compositor ())
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{
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compositor = meta_wayland_compositor_get_default ();
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@ -182,4 +182,7 @@ void meta_display_ungrab_keyboard (MetaDisplay *display,
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guint32 timestamp);
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void meta_display_unfreeze_keyboard (MetaDisplay *display,
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guint32 timestamp);
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gboolean meta_display_is_pointer_emulating_sequence (MetaDisplay *display,
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ClutterEventSequence *sequence);
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#endif
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