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Linux trackpad gestures (flutter#31592)
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #include "flutter/shell/platform/linux/fl_scrolling_manager.h" | ||
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| static constexpr int kMicrosecondsPerMillisecond = 1000; | ||
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| struct _FlScrollingManager { | ||
| GObject parent_instance; | ||
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| FlScrollingViewDelegate* view_delegate; | ||
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| gdouble last_x; | ||
| gdouble last_y; | ||
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| gboolean pan_started; | ||
| gdouble pan_x; | ||
| gdouble pan_y; | ||
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| gboolean zoom_started; | ||
| gboolean rotate_started; | ||
| gdouble scale; | ||
| gdouble rotation; | ||
| }; | ||
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| G_DEFINE_TYPE(FlScrollingManager, fl_scrolling_manager, G_TYPE_OBJECT); | ||
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| static void fl_scrolling_manager_dispose(GObject* object); | ||
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| static void fl_scrolling_manager_class_init(FlScrollingManagerClass* klass) { | ||
| G_OBJECT_CLASS(klass)->dispose = fl_scrolling_manager_dispose; | ||
| } | ||
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| static void fl_scrolling_manager_init(FlScrollingManager* self) {} | ||
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| static void fl_scrolling_manager_dispose(GObject* object) { | ||
| G_OBJECT_CLASS(fl_scrolling_manager_parent_class)->dispose(object); | ||
| } | ||
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| FlScrollingManager* fl_scrolling_manager_new( | ||
| FlScrollingViewDelegate* view_delegate) { | ||
| g_return_val_if_fail(FL_IS_SCROLLING_VIEW_DELEGATE(view_delegate), nullptr); | ||
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| FlScrollingManager* self = FL_SCROLLING_MANAGER( | ||
| g_object_new(fl_scrolling_manager_get_type(), nullptr)); | ||
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| self->view_delegate = view_delegate; | ||
| g_object_add_weak_pointer( | ||
| G_OBJECT(view_delegate), | ||
| reinterpret_cast<gpointer*>(&(self->view_delegate))); | ||
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| self->pan_started = false; | ||
| self->zoom_started = false; | ||
| self->rotate_started = false; | ||
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| return self; | ||
| } | ||
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| void fl_scrolling_manager_set_last_mouse_position(FlScrollingManager* self, | ||
| gdouble x, | ||
| gdouble y) { | ||
| self->last_x = x; | ||
| self->last_y = y; | ||
| } | ||
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| void fl_scrolling_manager_handle_scroll_event(FlScrollingManager* self, | ||
| GdkEventScroll* event, | ||
| gint scale_factor) { | ||
| gdouble scroll_delta_x = 0.0, scroll_delta_y = 0.0; | ||
| if (event->direction == GDK_SCROLL_SMOOTH) { | ||
| scroll_delta_x = event->delta_x; | ||
| scroll_delta_y = event->delta_y; | ||
| } else if (event->direction == GDK_SCROLL_UP) { | ||
| scroll_delta_y = -1; | ||
| } else if (event->direction == GDK_SCROLL_DOWN) { | ||
| scroll_delta_y = 1; | ||
| } else if (event->direction == GDK_SCROLL_LEFT) { | ||
| scroll_delta_x = -1; | ||
| } else if (event->direction == GDK_SCROLL_RIGHT) { | ||
| scroll_delta_x = 1; | ||
| } | ||
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| // The multiplier is taken from the Chromium source | ||
| // (ui/events/x/events_x_utils.cc). | ||
| const int kScrollOffsetMultiplier = 53; | ||
| scroll_delta_x *= kScrollOffsetMultiplier * scale_factor; | ||
| scroll_delta_y *= kScrollOffsetMultiplier * scale_factor; | ||
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| if (gdk_device_get_source(gdk_event_get_source_device((GdkEvent*)event)) == | ||
| GDK_SOURCE_TOUCHPAD) { | ||
| scroll_delta_x *= -1; | ||
| scroll_delta_y *= -1; | ||
| if (event->is_stop) { | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, event->time * kMicrosecondsPerMillisecond, | ||
| event->x * scale_factor, event->y * scale_factor, kPanZoomEnd, | ||
| self->pan_x, self->pan_y, 0, 0); | ||
| self->pan_started = FALSE; | ||
| } else { | ||
| if (!self->pan_started) { | ||
| self->pan_x = 0; | ||
| self->pan_y = 0; | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, event->time * kMicrosecondsPerMillisecond, | ||
| event->x * scale_factor, event->y * scale_factor, kPanZoomStart, 0, | ||
| 0, 0, 0); | ||
| self->pan_started = TRUE; | ||
| } | ||
| self->pan_x += scroll_delta_x; | ||
| self->pan_y += scroll_delta_y; | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, event->time * kMicrosecondsPerMillisecond, | ||
| event->x * scale_factor, event->y * scale_factor, kPanZoomUpdate, | ||
| self->pan_x, self->pan_y, 1, 0); | ||
| } | ||
| } else { | ||
| self->last_x = event->x * scale_factor; | ||
| self->last_y = event->y * scale_factor; | ||
| fl_scrolling_view_delegate_send_mouse_pointer_event( | ||
| self->view_delegate, | ||
| FlutterPointerPhase::kMove /* arbitrary value, phase will be ignored as | ||
| this is a discrete scroll event */ | ||
| , | ||
| event->time * kMicrosecondsPerMillisecond, event->x * scale_factor, | ||
| event->y * scale_factor, scroll_delta_x, scroll_delta_y, 0); | ||
| } | ||
| } | ||
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| void fl_scrolling_manager_handle_rotation_begin(FlScrollingManager* self) { | ||
| self->rotate_started = true; | ||
| if (!self->zoom_started) { | ||
| self->scale = 1; | ||
| self->rotation = 0; | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, g_get_real_time(), self->last_x, self->last_y, | ||
| kPanZoomStart, 0, 0, 0, 0); | ||
| } | ||
| } | ||
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| void fl_scrolling_manager_handle_rotation_update(FlScrollingManager* self, | ||
| gdouble rotation) { | ||
| self->rotation = rotation; | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, g_get_real_time(), self->last_x, self->last_y, | ||
| kPanZoomUpdate, 0, 0, self->scale, self->rotation); | ||
| } | ||
| void fl_scrolling_manager_handle_rotation_end(FlScrollingManager* self) { | ||
| self->rotate_started = false; | ||
| if (!self->zoom_started) { | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, g_get_real_time(), self->last_x, self->last_y, | ||
| kPanZoomEnd, 0, 0, 0, 0); | ||
| } | ||
| } | ||
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| void fl_scrolling_manager_handle_zoom_begin(FlScrollingManager* self) { | ||
| self->zoom_started = true; | ||
| if (!self->rotate_started) { | ||
| self->scale = 1; | ||
| self->rotation = 0; | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, g_get_real_time(), self->last_x, self->last_y, | ||
| kPanZoomStart, 0, 0, 0, 0); | ||
| } | ||
| } | ||
| void fl_scrolling_manager_handle_zoom_update(FlScrollingManager* self, | ||
| gdouble scale) { | ||
| self->scale = scale; | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, g_get_real_time(), self->last_x, self->last_y, | ||
| kPanZoomUpdate, 0, 0, self->scale, self->rotation); | ||
| } | ||
| void fl_scrolling_manager_handle_zoom_end(FlScrollingManager* self) { | ||
| self->zoom_started = false; | ||
| if (!self->rotate_started) { | ||
| fl_scrolling_view_delegate_send_pointer_pan_zoom_event( | ||
| self->view_delegate, g_get_real_time(), self->last_x, self->last_y, | ||
| kPanZoomEnd, 0, 0, 0, 0); | ||
| } | ||
| } |
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