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fl_scrolling_manager.cc File Reference

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Classes

struct  _FlScrollingManager
 

Functions

 G_DEFINE_TYPE (FlScrollingManager, fl_scrolling_manager, G_TYPE_OBJECT)
 
static void fl_scrolling_manager_dispose (GObject *object)
 
static void fl_scrolling_manager_class_init (FlScrollingManagerClass *klass)
 
static void fl_scrolling_manager_init (FlScrollingManager *self)
 
FlScrollingManager * fl_scrolling_manager_new (FlScrollingViewDelegate *view_delegate)
 
void fl_scrolling_manager_set_last_mouse_position (FlScrollingManager *self, gdouble x, gdouble y)
 
void fl_scrolling_manager_handle_scroll_event (FlScrollingManager *self, GdkEventScroll *scroll_event, gint scale_factor)
 
void fl_scrolling_manager_handle_rotation_begin (FlScrollingManager *self)
 
void fl_scrolling_manager_handle_rotation_update (FlScrollingManager *self, gdouble rotation)
 
void fl_scrolling_manager_handle_rotation_end (FlScrollingManager *self)
 
void fl_scrolling_manager_handle_zoom_begin (FlScrollingManager *self)
 
void fl_scrolling_manager_handle_zoom_update (FlScrollingManager *self, gdouble scale)
 
void fl_scrolling_manager_handle_zoom_end (FlScrollingManager *self)
 

Variables

static constexpr int kMicrosecondsPerMillisecond = 1000
 

Function Documentation

◆ fl_scrolling_manager_class_init()

static void fl_scrolling_manager_class_init ( FlScrollingManagerClass *  klass)
static

Definition at line 41 of file fl_scrolling_manager.cc.

41  {
42  G_OBJECT_CLASS(klass)->dispose = fl_scrolling_manager_dispose;
43 }

References fl_scrolling_manager_dispose().

◆ fl_scrolling_manager_dispose()

static void fl_scrolling_manager_dispose ( GObject *  object)
static

Definition at line 29 of file fl_scrolling_manager.cc.

29  {
30  FlScrollingManager* self = FL_SCROLLING_MANAGER(object);
31 
32  if (self->view_delegate != nullptr) {
33  g_object_remove_weak_pointer(
34  object, reinterpret_cast<gpointer*>(&self->view_delegate));
35  self->view_delegate = nullptr;
36  }
37 
38  G_OBJECT_CLASS(fl_scrolling_manager_parent_class)->dispose(object);
39 }

Referenced by fl_scrolling_manager_class_init().

◆ fl_scrolling_manager_handle_rotation_begin()

void fl_scrolling_manager_handle_rotation_begin ( FlScrollingManager *  manager)

fl_scrolling_manager_handle_rotation_begin: @manager: an #FlScrollingManager.

Inform the scrolling manager that a rotation gesture has begun.

Definition at line 151 of file fl_scrolling_manager.cc.

151  {
152  g_return_if_fail(FL_IS_SCROLLING_MANAGER(self));
153 
154  self->rotate_started = TRUE;
155  if (!self->zoom_started) {
156  self->scale = 1;
157  self->rotation = 0;
159  self->view_delegate, g_get_real_time(), self->last_x, self->last_y,
160  kPanZoomStart, 0, 0, 0, 0);
161  }
162 }

References fl_scrolling_view_delegate_send_pointer_pan_zoom_event(), and TRUE.

Referenced by gesture_rotation_begin_cb().

◆ fl_scrolling_manager_handle_rotation_end()

void fl_scrolling_manager_handle_rotation_end ( FlScrollingManager *  manager)

fl_scrolling_manager_handle_rotation_end: @manager: an #FlScrollingManager.

Inform the scrolling manager that a rotation gesture has ended.

Definition at line 174 of file fl_scrolling_manager.cc.

174  {
175  g_return_if_fail(FL_IS_SCROLLING_MANAGER(self));
176 
177  self->rotate_started = FALSE;
178  if (!self->zoom_started) {
180  self->view_delegate, g_get_real_time(), self->last_x, self->last_y,
181  kPanZoomEnd, 0, 0, 0, 0);
182  }
183 }

References fl_scrolling_view_delegate_send_pointer_pan_zoom_event().

Referenced by gesture_rotation_end_cb().

◆ fl_scrolling_manager_handle_rotation_update()

void fl_scrolling_manager_handle_rotation_update ( FlScrollingManager *  manager,
gdouble  rotation 
)

fl_scrolling_manager_handle_rotation_update: @manager: an #FlScrollingManager. @rotation: the rotation angle, in radians.

Inform the scrolling manager that a rotation gesture has updated.

Definition at line 164 of file fl_scrolling_manager.cc.

165  {
166  g_return_if_fail(FL_IS_SCROLLING_MANAGER(self));
167 
168  self->rotation = rotation;
170  self->view_delegate, g_get_real_time(), self->last_x, self->last_y,
171  kPanZoomUpdate, 0, 0, self->scale, self->rotation);
172 }

References fl_scrolling_view_delegate_send_pointer_pan_zoom_event().

Referenced by gesture_rotation_update_cb().

◆ fl_scrolling_manager_handle_scroll_event()

void fl_scrolling_manager_handle_scroll_event ( FlScrollingManager *  manager,
GdkEventScroll *  event,
gint  scale_factor 
)

fl_scrolling_manager_handle_scroll_event: @manager: an #FlScrollingManager. @event: the scroll event. @scale_factor: the GTK scaling factor of the window.

Inform the scrolling manager of a scroll event.

Definition at line 74 of file fl_scrolling_manager.cc.

76  {
77  g_return_if_fail(FL_IS_SCROLLING_MANAGER(self));
78 
79  GdkEvent* event = reinterpret_cast<GdkEvent*>(scroll_event);
80 
81  guint event_time = gdk_event_get_time(event);
82  gdouble event_x = 0.0, event_y = 0.0;
83  gdk_event_get_coords(event, &event_x, &event_y);
84  gdouble scroll_delta_x = 0.0, scroll_delta_y = 0.0;
85  GdkScrollDirection event_direction = GDK_SCROLL_SMOOTH;
86  if (gdk_event_get_scroll_direction(event, &event_direction)) {
87  if (event_direction == GDK_SCROLL_UP) {
88  scroll_delta_x = 0;
89  scroll_delta_y = -1;
90  } else if (event_direction == GDK_SCROLL_DOWN) {
91  scroll_delta_x = 0;
92  scroll_delta_y = 1;
93  } else if (event_direction == GDK_SCROLL_LEFT) {
94  scroll_delta_x = -1;
95  scroll_delta_y = 0;
96  } else if (event_direction == GDK_SCROLL_RIGHT) {
97  scroll_delta_x = 1;
98  scroll_delta_y = 0;
99  }
100  } else {
101  gdk_event_get_scroll_deltas(event, &scroll_delta_x, &scroll_delta_y);
102  }
103 
104  // The multiplier is taken from the Chromium source
105  // (ui/events/x/events_x_utils.cc).
106  const int kScrollOffsetMultiplier = 53;
107  scroll_delta_x *= kScrollOffsetMultiplier * scale_factor;
108  scroll_delta_y *= kScrollOffsetMultiplier * scale_factor;
109 
110  if (gdk_device_get_source(gdk_event_get_source_device(event)) ==
111  GDK_SOURCE_TOUCHPAD) {
112  scroll_delta_x *= -1;
113  scroll_delta_y *= -1;
114  if (gdk_event_is_scroll_stop_event(event)) {
116  self->view_delegate, event_time * kMicrosecondsPerMillisecond,
117  event_x * scale_factor, event_y * scale_factor, kPanZoomEnd,
118  self->pan_x, self->pan_y, 0, 0);
119  self->pan_started = FALSE;
120  } else {
121  if (!self->pan_started) {
122  self->pan_x = 0;
123  self->pan_y = 0;
125  self->view_delegate, event_time * kMicrosecondsPerMillisecond,
126  event_x * scale_factor, event_y * scale_factor, kPanZoomStart, 0, 0,
127  0, 0);
128  self->pan_started = TRUE;
129  }
130  self->pan_x += scroll_delta_x;
131  self->pan_y += scroll_delta_y;
133  self->view_delegate, event_time * kMicrosecondsPerMillisecond,
134  event_x * scale_factor, event_y * scale_factor, kPanZoomUpdate,
135  self->pan_x, self->pan_y, 1, 0);
136  }
137  } else {
138  self->last_x = event_x * scale_factor;
139  self->last_y = event_y * scale_factor;
141  self->view_delegate,
142  FlutterPointerPhase::kMove /* arbitrary value, phase will be ignored as
143  this is a discrete scroll event */
144  ,
145  event_time * kMicrosecondsPerMillisecond, event_x * scale_factor,
146  event_y * scale_factor, kFlutterPointerDeviceKindMouse, scroll_delta_x,
147  scroll_delta_y, 0);
148  }
149 }

References event, fl_scrolling_view_delegate_send_mouse_pointer_event(), fl_scrolling_view_delegate_send_pointer_pan_zoom_event(), kMicrosecondsPerMillisecond, and TRUE.

Referenced by scroll_event_cb().

◆ fl_scrolling_manager_handle_zoom_begin()

void fl_scrolling_manager_handle_zoom_begin ( FlScrollingManager *  manager)

fl_scrolling_manager_handle_zoom_begin: @manager: an #FlScrollingManager.

Inform the scrolling manager that a zoom gesture has begun.

Definition at line 185 of file fl_scrolling_manager.cc.

185  {
186  g_return_if_fail(FL_IS_SCROLLING_MANAGER(self));
187 
188  self->zoom_started = TRUE;
189  if (!self->rotate_started) {
190  self->scale = 1;
191  self->rotation = 0;
193  self->view_delegate, g_get_real_time(), self->last_x, self->last_y,
194  kPanZoomStart, 0, 0, 0, 0);
195  }
196 }

References fl_scrolling_view_delegate_send_pointer_pan_zoom_event(), and TRUE.

Referenced by gesture_zoom_begin_cb().

◆ fl_scrolling_manager_handle_zoom_end()

void fl_scrolling_manager_handle_zoom_end ( FlScrollingManager *  manager)

fl_scrolling_manager_handle_zoom_end: @manager: an #FlScrollingManager.

Inform the scrolling manager that a zoom gesture has ended.

Definition at line 208 of file fl_scrolling_manager.cc.

208  {
209  g_return_if_fail(FL_IS_SCROLLING_MANAGER(self));
210 
211  self->zoom_started = FALSE;
212  if (!self->rotate_started) {
214  self->view_delegate, g_get_real_time(), self->last_x, self->last_y,
215  kPanZoomEnd, 0, 0, 0, 0);
216  }
217 }

References fl_scrolling_view_delegate_send_pointer_pan_zoom_event().

Referenced by gesture_zoom_end_cb().

◆ fl_scrolling_manager_handle_zoom_update()

void fl_scrolling_manager_handle_zoom_update ( FlScrollingManager *  manager,
gdouble  scale 
)

fl_scrolling_manager_handle_zoom_update: @manager: an #FlScrollingManager. @scale: the zoom scale.

Inform the scrolling manager that a zoom gesture has updated.

Definition at line 198 of file fl_scrolling_manager.cc.

199  {
200  g_return_if_fail(FL_IS_SCROLLING_MANAGER(self));
201 
202  self->scale = scale;
204  self->view_delegate, g_get_real_time(), self->last_x, self->last_y,
205  kPanZoomUpdate, 0, 0, self->scale, self->rotation);
206 }

References fl_scrolling_view_delegate_send_pointer_pan_zoom_event().

Referenced by gesture_zoom_update_cb().

◆ fl_scrolling_manager_init()

static void fl_scrolling_manager_init ( FlScrollingManager *  self)
static

Definition at line 45 of file fl_scrolling_manager.cc.

45 {}

◆ fl_scrolling_manager_new()

FlScrollingManager* fl_scrolling_manager_new ( FlScrollingViewDelegate *  view_delegate)

fl_scrolling_manager_new: @view_delegate: An interface that the manager requires to communicate with the platform. Usually implemented by FlView.

Create a new #FlScrollingManager.

Returns: a new #FlScrollingManager.

Definition at line 47 of file fl_scrolling_manager.cc.

48  {
49  g_return_val_if_fail(FL_IS_SCROLLING_VIEW_DELEGATE(view_delegate), nullptr);
50 
51  FlScrollingManager* self = FL_SCROLLING_MANAGER(
52  g_object_new(fl_scrolling_manager_get_type(), nullptr));
53 
54  self->view_delegate = view_delegate;
55  g_object_add_weak_pointer(
56  G_OBJECT(view_delegate),
57  reinterpret_cast<gpointer*>(&(self->view_delegate)));
58 
59  self->pan_started = FALSE;
60  self->zoom_started = FALSE;
61  self->rotate_started = FALSE;
62 
63  return self;
64 }

Referenced by init_scrolling().

◆ fl_scrolling_manager_set_last_mouse_position()

void fl_scrolling_manager_set_last_mouse_position ( FlScrollingManager *  manager,
gdouble  x,
gdouble  y 
)

fl_scrolling_manager_set_last_mouse_position: @manager: an #FlScrollingManager. @x: the mouse x-position, in window coordinates. @y: the mouse y-position, in window coordinates.

Inform the scrolling manager of the mouse position. This position will be used when sending scroll pointer events.

Definition at line 66 of file fl_scrolling_manager.cc.

68  {
69  g_return_if_fail(FL_IS_SCROLLING_MANAGER(self));
70  self->last_x = x;
71  self->last_y = y;
72 }

Referenced by send_pointer_button_event().

◆ G_DEFINE_TYPE()

G_DEFINE_TYPE ( FlScrollingManager  ,
fl_scrolling_manager  ,
G_TYPE_OBJECT   
)

Variable Documentation

◆ kMicrosecondsPerMillisecond

constexpr int kMicrosecondsPerMillisecond = 1000
staticconstexpr

Definition at line 7 of file fl_scrolling_manager.cc.

Referenced by fl_scrolling_manager_handle_scroll_event().

event
FlKeyEvent * event
Definition: fl_key_channel_responder.cc:118
fl_scrolling_manager_dispose
static void fl_scrolling_manager_dispose(GObject *object)
Definition: fl_scrolling_manager.cc:29
fl_scrolling_view_delegate_send_mouse_pointer_event
void fl_scrolling_view_delegate_send_mouse_pointer_event(FlScrollingViewDelegate *self, FlutterPointerPhase phase, size_t timestamp, double x, double y, FlutterPointerDeviceKind device_kind, double scroll_delta_x, double scroll_delta_y, int64_t buttons)
Definition: fl_scrolling_view_delegate.cc:14
TRUE
return TRUE
Definition: fl_pixel_buffer_texture_test.cc:53
kMicrosecondsPerMillisecond
static constexpr int kMicrosecondsPerMillisecond
Definition: fl_scrolling_manager.cc:7
fl_scrolling_view_delegate_send_pointer_pan_zoom_event
void fl_scrolling_view_delegate_send_pointer_pan_zoom_event(FlScrollingViewDelegate *self, size_t timestamp, double x, double y, FlutterPointerPhase phase, double pan_x, double pan_y, double scale, double rotation)
Definition: fl_scrolling_view_delegate.cc:30