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navigation: Add API for touchscreen events
Add 5 new navigation event types for touchscreen events, with the same naming and meaning as in libinput - touch-down, touch-motion, touch-up, touch-frame and touch-cancel - as well as constructors and parse functions for them. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1633>
This commit is contained in:
Vivienne Watermeier
GStreamer Marge Bot
parent
6c2f6c3bd4
commit
01876d5712
2 changed files with 330 additions and 11 deletions
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@ -784,6 +784,16 @@ gst_navigation_event_get_type (GstEvent * event)
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return GST_NAVIGATION_EVENT_KEY_RELEASE;
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else if (g_str_equal (e_type, "command"))
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return GST_NAVIGATION_EVENT_COMMAND;
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else if (g_str_equal (e_type, "touch-down"))
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return GST_NAVIGATION_EVENT_TOUCH_DOWN;
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else if (g_str_equal (e_type, "touch-up"))
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return GST_NAVIGATION_EVENT_TOUCH_UP;
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else if (g_str_equal (e_type, "touch-cancel"))
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return GST_NAVIGATION_EVENT_TOUCH_CANCEL;
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else if (g_str_equal (e_type, "touch-motion"))
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return GST_NAVIGATION_EVENT_TOUCH_MOTION;
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else if (g_str_equal (e_type, "touch-frame"))
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return GST_NAVIGATION_EVENT_TOUCH_FRAME;
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return GST_NAVIGATION_EVENT_INVALID;
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}
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@ -928,6 +938,122 @@ gst_navigation_event_new_command (GstNavigationCommand command)
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"command-code", G_TYPE_UINT, (guint) command, NULL));
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}
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/**
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* gst_navigation_event_new_touch_down:
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* @identifier: A number uniquely identifying this touch point. It must stay
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* unique to this touch point at least until an up event is sent for
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* the same identifier, or all touch points are cancelled.
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* @x: The x coordinate of the new touch point.
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* @y: The y coordinate of the new touch point.
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* @pressure: Pressure data of the touch point, from 0.0 to 1.0, or NaN if no
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* data is available.
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*
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* Create a new navigation event for an added touch point.
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*
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* Returns: (transfer full): a new #GstEvent
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*
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* Since: 1.22
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*/
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GstEvent *
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gst_navigation_event_new_touch_down (guint identifier, gdouble x, gdouble y,
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gdouble pressure)
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{
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return gst_event_new_navigation (gst_structure_new (GST_NAVIGATION_EVENT_NAME,
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"event", G_TYPE_STRING, "touch-down",
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"identifier", G_TYPE_UINT, identifier,
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"pointer_x", G_TYPE_DOUBLE, x,
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"pointer_y", G_TYPE_DOUBLE, y,
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"pressure", G_TYPE_DOUBLE, pressure, NULL));
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}
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/**
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* gst_navigation_event_new_touch_motion:
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* @identifier: A number uniquely identifying this touch point. It must
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* correlate to exactly one previous touch_start event.
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* @x: The x coordinate of the touch point.
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* @y: The y coordinate of the touch point.
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* @pressure: Pressure data of the touch point, from 0.0 to 1.0, or NaN if no
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* data is available.
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*
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* Create a new navigation event for a moved touch point.
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*
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* Returns: (transfer full): a new #GstEvent
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*
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* Since: 1.22
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*/
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GstEvent *
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gst_navigation_event_new_touch_motion (guint identifier, gdouble x, gdouble y,
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gdouble pressure)
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{
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return gst_event_new_navigation (gst_structure_new (GST_NAVIGATION_EVENT_NAME,
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"event", G_TYPE_STRING, "touch-motion",
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"identifier", G_TYPE_UINT, identifier,
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"pointer_x", G_TYPE_DOUBLE, x,
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"pointer_y", G_TYPE_DOUBLE, y,
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"pressure", G_TYPE_DOUBLE, pressure, NULL));
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}
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/**
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* gst_navigation_event_new_touch_up:
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* @identifier: A number uniquely identifying this touch point. It must
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* correlate to exactly one previous down event, but can be reused
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* after sending this event.
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* @x: The x coordinate of the touch point.
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* @y: The y coordinate of the touch point.
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*
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* Create a new navigation event for a removed touch point.
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*
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* Returns: (transfer full): a new #GstEvent
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*
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* Since: 1.22
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*/
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GstEvent *
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gst_navigation_event_new_touch_up (guint identifier, gdouble x, gdouble y)
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{
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return gst_event_new_navigation (gst_structure_new (GST_NAVIGATION_EVENT_NAME,
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"event", G_TYPE_STRING, "touch-up",
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"identifier", G_TYPE_UINT, identifier,
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"pointer_x", G_TYPE_DOUBLE, x, "pointer_y", G_TYPE_DOUBLE, y, NULL));
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}
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/**
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* gst_navigation_event_new_touch_frame:
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*
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* Create a new navigation event signalling the end of a touch frame. Touch
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* frames signal that all previous down, motion and up events not followed by
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* another touch frame event already should be considered simultaneous.
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*
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* Returns: (transfer full): a new #GstEvent
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*
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* Since: 1.22
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*/
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GstEvent *
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gst_navigation_event_new_touch_frame (void)
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{
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return gst_event_new_navigation (gst_structure_new (GST_NAVIGATION_EVENT_NAME,
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"event", G_TYPE_STRING, "touch-frame", NULL));
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}
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/**
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* gst_navigation_event_new_touch_cancel:
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*
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* Create a new navigation event signalling that all currently active touch
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* points are cancelled and should be discarded. For example, under Wayland
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* this event might be sent when a swipe passes the threshold to be recognized
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* as a gesture by the compositor.
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*
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* Returns: (transfer full): a new #GstEvent
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*
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* Since: 1.22
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*/
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GstEvent *
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gst_navigation_event_new_touch_cancel (void)
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{
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return gst_event_new_navigation (gst_structure_new (GST_NAVIGATION_EVENT_NAME,
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"event", G_TYPE_STRING, "touch-cancel", NULL));
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}
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/**
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* gst_navigation_event_parse_key_event:
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* @event: A #GstEvent to inspect.
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@ -1104,6 +1230,92 @@ gst_navigation_event_parse_command (GstEvent * event,
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return ret;
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}
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/**
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* gst_navigation_event_parse_touch_event:
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* @event: A #GstEvent to inspect.
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* @identifier: (out) (optional): Pointer to a guint that will receive the
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* identifier unique to this touch point.
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* @x: (out) (optional): Pointer to a gdouble that will receive the x
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* coordinate of the touch event.
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* @y: (out) (optional): Pointer to a gdouble that will receive the y
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* coordinate of the touch event.
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* @pressure: (out) (optional): Pointer to a gdouble that will receive the
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* force of the touch event, in the range from 0.0 to 1.0. If pressure
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* data is not available, NaN will be set instead.
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*
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* Retrieve the details of a #GstNavigation touch-down or touch-motion event.
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* Determine which type the event is using gst_navigation_event_get_type()
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* to retrieve the #GstNavigationEventType.
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*
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* Returns: TRUE if all details could be extracted, otherwise FALSE.
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*
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* Since: 1.22
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*/
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gboolean
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gst_navigation_event_parse_touch_event (GstEvent * event, guint * identifier,
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gdouble * x, gdouble * y, gdouble * pressure)
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{
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GstNavigationEventType e_type;
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const GstStructure *s;
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gboolean ret = TRUE;
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e_type = gst_navigation_event_get_type (event);
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g_return_val_if_fail (e_type == GST_NAVIGATION_EVENT_TOUCH_DOWN ||
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e_type == GST_NAVIGATION_EVENT_TOUCH_MOTION, FALSE);
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s = gst_event_get_structure (event);
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if (identifier)
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ret &= gst_structure_get_uint (s, "identifier", identifier);
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if (x)
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ret &= gst_structure_get_double (s, "pointer_x", x);
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if (y)
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ret &= gst_structure_get_double (s, "pointer_y", y);
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if (pressure)
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ret &= gst_structure_get_double (s, "pressure", pressure);
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WARN_IF_FAIL (ret, "Couldn't extract details from touch event");
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return ret;
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}
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/**
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* gst_navigation_event_parse_touch_up_event:
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* @event: A #GstEvent to inspect.
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* @identifier: (out) (optional): Pointer to a guint that will receive the
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* identifier unique to this touch point.
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* @x: (out) (optional): Pointer to a gdouble that will receive the x
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* coordinate of the touch event.
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* @y: (out) (optional): Pointer to a gdouble that will receive the y
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* coordinate of the touch event.
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*
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* Retrieve the details of a #GstNavigation touch-up event.
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*
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* Returns: TRUE if all details could be extracted, otherwise FALSE.
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*
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* Since: 1.22
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*/
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gboolean
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gst_navigation_event_parse_touch_up_event (GstEvent * event,
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guint * identifier, gdouble * x, gdouble * y)
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{
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const GstStructure *s;
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gboolean ret = TRUE;
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g_return_val_if_fail (GST_NAVIGATION_EVENT_HAS_TYPE (event, TOUCH_UP), FALSE);
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s = gst_event_get_structure (event);
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if (identifier)
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ret &= gst_structure_get_uint (s, "identifier", identifier);
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if (x)
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ret &= gst_structure_get_double (s, "pointer_x", x);
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if (y)
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ret &= gst_structure_get_double (s, "pointer_y", y);
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WARN_IF_FAIL (ret, "Couldn't extract details from touch-up event");
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return ret;
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}
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/**
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* gst_navigation_event_get_coordinates:
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* @event: The #GstEvent to inspect.
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@ -1129,7 +1341,10 @@ gst_navigation_event_get_coordinates (GstEvent * event,
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e_type = gst_navigation_event_get_type (event);
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if (e_type != GST_NAVIGATION_EVENT_MOUSE_MOVE
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&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS
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&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE) {
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&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE
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&& e_type != GST_NAVIGATION_EVENT_TOUCH_DOWN
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&& e_type != GST_NAVIGATION_EVENT_TOUCH_MOTION
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&& e_type != GST_NAVIGATION_EVENT_TOUCH_UP) {
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return FALSE;
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}
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@ -1168,7 +1383,10 @@ gst_navigation_event_set_coordinates (GstEvent * event, gdouble x, gdouble y)
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e_type = gst_navigation_event_get_type (event);
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if (e_type != GST_NAVIGATION_EVENT_MOUSE_MOVE
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&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS
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&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE) {
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&& e_type != GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE
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&& e_type != GST_NAVIGATION_EVENT_TOUCH_DOWN
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&& e_type != GST_NAVIGATION_EVENT_TOUCH_MOTION
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&& e_type != GST_NAVIGATION_EVENT_TOUCH_UP) {
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return FALSE;
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}
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@ -281,9 +281,26 @@ gboolean gst_navigation_message_parse_event (GstMessage *message
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* @GST_NAVIGATION_EVENT_MOUSE_SCROLL: A mouse scroll event. Use
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* gst_navigation_event_parse_mouse_scroll_event() to extract the details from
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* the event. (Since: 1.18)
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* @GST_NAVIGATION_EVENT_TOUCH_DOWN: An event describing a new touch point,
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* which will be assigned an identifier that is unique to it for the duration
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* of its movement on the screen. Use gst_navigation_event_parse_touch_event()
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* to extract the details from the event. (Since: 1.22)
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* @GST_NAVIGATION_EVENT_TOUCH_MOTION: An event describing the movement of an
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* active touch point across the screen. Use
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* gst_navigation_event_parse_touch_event() to extract the details from the
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* event. (Since: 1.22)
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* @GST_NAVIGATION_EVENT_TOUCH_UP: An event describing a removed touch point.
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* After this event, its identifier may be reused for any new touch points. Use
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* gst_navigation_event_parse_touch_up_event() to extract the details from the
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* event. (Since: 1.22)
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* @GST_NAVIGATION_EVENT_TOUCH_FRAME: An event signaling the end of a sequence
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* of simultaneous touch events. (Since: 1.22)
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* @GST_NAVIGATION_EVENT_TOUCH_CANCEL: An event cancelling all currently active
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* touch points. (Since: 1.22)
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*
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* Enum values for the various events that an element implementing the
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* GstNavigation interface might send up the pipeline.
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* GstNavigation interface might send up the pipeline. Touch events have been
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* inspired by the libinput API, and have the same meaning here.
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*/
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typedef enum {
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GST_NAVIGATION_EVENT_INVALID = 0,
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@ -302,7 +319,60 @@ typedef enum {
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*
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* Since: 1.18
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*/
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GST_NAVIGATION_EVENT_MOUSE_SCROLL = 7
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GST_NAVIGATION_EVENT_MOUSE_SCROLL = 7,
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/**
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* GST_NAVIGATION_EVENT_TOUCH_DOWN:
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*
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* An event describing a new touch point, which will be assigned an identifier
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* that is unique to it for the duration of its movement on the screen.
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* Use gst_navigation_event_parse_touch_event() to extract the details
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* from the event.
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*
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* Since: 1.22
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*/
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GST_NAVIGATION_EVENT_TOUCH_DOWN = 8,
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/**
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* GST_NAVIGATION_EVENT_TOUCH_MOTION:
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*
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* An event describing the movement of an active touch point across
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* the screen. Use gst_navigation_event_parse_touch_event() to extract
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* the details from the event.
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*
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* Since: 1.22
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*/
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GST_NAVIGATION_EVENT_TOUCH_MOTION = 9,
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/**
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* GST_NAVIGATION_EVENT_TOUCH_UP:
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*
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* An event describing a removed touch point. After this event,
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* its identifier may be reused for any new touch points.
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* Use gst_navigation_event_parse_touch_up_event() to extract the details
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* from the event.
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*
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* Since: 1.22
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*/
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GST_NAVIGATION_EVENT_TOUCH_UP = 10,
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/**
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* GST_NAVIGATION_EVENT_TOUCH_FRAME:
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*
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* An event signaling the end of a sequence of simultaneous touch events.
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*
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* Since: 1.22
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*/
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GST_NAVIGATION_EVENT_TOUCH_FRAME = 11,
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/**
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* GST_NAVIGATION_EVENT_TOUCH_CANCEL:
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*
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* An event cancelling all currently active touch points.
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*
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* Since: 1.22
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*/
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GST_NAVIGATION_EVENT_TOUCH_CANCEL = 12,
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} GstNavigationEventType;
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GST_VIDEO_API
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@ -332,6 +402,26 @@ GstEvent* gst_navigation_event_new_mouse_scroll (gdouble x, gdoubl
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GST_VIDEO_API
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GstEvent* gst_navigation_event_new_command (GstNavigationCommand command) G_GNUC_MALLOC;
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GST_VIDEO_API
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GstEvent* gst_navigation_event_new_touch_down (guint identifier,
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gdouble x, gdouble y,
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gdouble pressure) G_GNUC_MALLOC;
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GST_VIDEO_API
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GstEvent* gst_navigation_event_new_touch_motion (guint identifier,
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gdouble x, gdouble y,
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gdouble pressure) G_GNUC_MALLOC;
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GST_VIDEO_API
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GstEvent* gst_navigation_event_new_touch_up (guint identifier,
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gdouble x, gdouble y) G_GNUC_MALLOC;
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GST_VIDEO_API
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GstEvent* gst_navigation_event_new_touch_frame (void) G_GNUC_MALLOC;
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GST_VIDEO_API
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GstEvent* gst_navigation_event_new_touch_cancel (void) G_GNUC_MALLOC;
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GST_VIDEO_API
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gboolean gst_navigation_event_parse_key_event (GstEvent *event,
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const gchar **key);
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@ -353,6 +443,17 @@ GST_VIDEO_API
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gboolean gst_navigation_event_parse_command (GstEvent *event,
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GstNavigationCommand *command);
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GST_VIDEO_API
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gboolean gst_navigation_event_parse_touch_event (GstEvent * event,
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guint * identifier,
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gdouble * x, gdouble * y,
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gdouble * pressure);
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GST_VIDEO_API
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gboolean gst_navigation_event_parse_touch_up_event (GstEvent * event,
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guint * identifier,
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gdouble * x, gdouble * y);
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GST_VIDEO_API
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gboolean gst_navigation_event_get_coordinates (GstEvent * event,
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gdouble * x, gdouble * y);
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