fl_touch_manager.h File Reference

#include <gdk/gdk.h>
#include "flutter/shell/platform/embedder/embedder.h"
#include "flutter/shell/platform/linux/public/flutter_linux/fl_engine.h"

Go to the source code of this file.

Functions
G_BEGIN_DECLS	G_DECLARE_FINAL_TYPE (FlTouchManager, fl_touch_manager, FL, TOUCH_MANAGER, GObject)
FlTouchManager *	fl_touch_manager_new (FlEngine *engine, FlutterViewId view_id)
void	fl_touch_manager_handle_touch_event (FlTouchManager *manager, GdkEventTouch *event, gint scale_factor)

Function Documentation

fl_touch_manager_handle_touch_event()

void fl_touch_manager_handle_touch_event	(	FlTouchManager *	manager,
		GdkEventTouch *	event,
		gint	scale_factor
	)

fl_touch_manager_handle_touch_event: @manager: an #FlTouchManager. @event: the touch event. @scale_factor: the GTK scaling factor of the window.

Definition at line 131 of file fl_touch_manager.cc.

                                                            {
  g_return_if_fail(FL_IS_TOUCH_MANAGER(self));
 
  g_autoptr(FlEngine) engine = FL_ENGINE(g_weak_ref_get(&self->engine));
  if (engine == nullptr) {
    return;
  }
 
  GdkEvent* event = reinterpret_cast<GdkEvent*>(touch_event);
  // get sequence id from GdkEvent
  GdkEventSequence* seq = gdk_event_get_event_sequence(event);
  // cast pointer to int to get unique id
  uint32_t id = reinterpret_cast<uint64_t>(seq);
  // generate touch id from unique id
  auto touch_id = get_generated_id(self, id);
  // get device id
  auto device_id =
      static_cast<int32_t>(kFlutterPointerDeviceKindTouch) << 28 | touch_id;
 
  gdouble event_x = 0.0, event_y = 0.0;
  gdk_event_get_coords(event, &event_x, &event_y);
 
  double x = event_x * scale_factor;
  double y = event_y * scale_factor;
 
  guint event_time = gdk_event_get_time(event);
 
  ensure_touch_added(self, event_time, x, y, touch_id, device_id);
 
  GdkEventType touch_event_type = gdk_event_get_event_type(event);
 
  switch (touch_event_type) {
    case GDK_TOUCH_BEGIN:
      fl_engine_send_touch_down_event(engine, self->view_id,
                                      event_time * kMicrosecondsPerMillisecond,
                                      x, y, device_id);
      break;
    case GDK_TOUCH_UPDATE:
      fl_engine_send_touch_move_event(engine, self->view_id,
                                      event_time * kMicrosecondsPerMillisecond,
                                      x, y, device_id);
      break;
    case GDK_TOUCH_END:
      fl_engine_send_touch_up_event(engine, self->view_id,
                                    event_time * kMicrosecondsPerMillisecond, x,
                                    y, device_id);
 
      fl_engine_send_touch_remove_event(
          engine, self->view_id, event_time * kMicrosecondsPerMillisecond, x, y,
          device_id);
      release_number(self, id);
      self->added_touch_devices =
          g_list_remove(self->added_touch_devices, GINT_TO_POINTER(touch_id));
      break;
    default:
      break;
  }
}

References ensure_touch_added(), fl_engine_send_touch_down_event(), fl_engine_send_touch_move_event(), fl_engine_send_touch_remove_event(), fl_engine_send_touch_up_event(), get_generated_id(), kMicrosecondsPerMillisecond, and release_number().

Referenced by TEST(), and touch_event_cb().

fl_touch_manager_new()

FlTouchManager* fl_touch_manager_new	(	FlEngine *	engine,
		FlutterViewId	view_id
	)

fl_touch_manager_new: @engine: an #FlEngine. @view_id: the view being managed.

Create a new #FlTouchManager.

Returns: a new #FlTouchManager.

Definition at line 48 of file fl_touch_manager.cc.

                                                                              {
  g_return_val_if_fail(FL_IS_ENGINE(engine), nullptr);
 
  FlTouchManager* self =
      FL_TOUCH_MANAGER(g_object_new(fl_touch_manager_get_type(), nullptr));
 
  g_weak_ref_init(&self->engine, engine);
  self->view_id = view_id;
 
  self->number_to_id =
      g_hash_table_new_full(g_direct_hash, g_direct_equal, nullptr, nullptr);
 
  self->min_touch_device_id = kMinTouchDeviceId;
 
  return self;
}

References kMinTouchDeviceId.

Referenced by init_touch(), and TEST().

G_DECLARE_FINAL_TYPE()

G_BEGIN_DECLS G_DECLARE_FINAL_TYPE	(	FlTouchManager	,
		fl_touch_manager	,
		FL	,
		TOUCH_MANAGER	,
		GObject
	)