[Touch emulator] Update cursor when device scale factor changes.

content/browser/renderer_host/input/touch_emulator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EMULATOR_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EMULATOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "content/browser/renderer_host/input/touch_emulator_client.h"
 #include "content/common/cursors/webcursor.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/events/gesture_detection/filtered_gesture_provider.h"
 #include "ui/events/gesture_detection/gesture_provider_config_helper.h"
 #include "ui/gfx/geometry/size_f.h"
 
 namespace content {
 
 // Emulates touch input with mouse and keyboard.
 class CONTENT_EXPORT TouchEmulator : public ui::GestureProviderClient {
  public:
   TouchEmulator(TouchEmulatorClient* client, float device_scale_factor);
   ~TouchEmulator() override;
 
   void Enable(ui::GestureProviderConfigType config_type);
   void Disable();
 
+  // Call when device scale factor changes.
+  void SetDeviceScaleFactor(float device_scale_factor);
+
   // See GestureProvider::SetDoubleTapSupportForPageEnabled.
   void SetDoubleTapSupportForPageEnabled(bool enabled);
 
   // Note that TouchEmulator should always listen to touch events and their acks
   // (even in disabled state) to track native stream presence.
   bool enabled() const { return !!gesture_provider_; }
 
   // Returns |true| if the event was consumed. Consumed event should not
   // propagate any further.
   // TODO(dgozman): maybe pass latency info together with events.
@@ skipping 10 matching lines @@
   // Cancel any touches, for example, when focus is lost.
   void CancelTouch();
 
  private:
   // ui::GestureProviderClient implementation.
   void OnGestureEvent(const ui::GestureEventData& gesture) override;
 
   // Returns cursor size in DIP.
   gfx::SizeF InitCursorFromResource(
       WebCursor* cursor, float scale, int resource_id);
+  bool InitCursors(float device_scale_factor, bool force);
   void ResetState();
   void UpdateCursor();
   bool UpdateShiftPressed(bool shift_pressed);
 
   // Whether we should convert scrolls into pinches.
   bool InPinchGestureMode() const;
 
   void FillTouchEventAndPoint(const blink::WebMouseEvent& mouse_event);
   void FillPinchEvent(const blink::WebInputEvent& event);
 
@@ skipping 11 matching lines @@
 
   // Emulator is enabled iff gesture provider is created.
   // Disabled emulator does only process touch acks left from previous
   // emulation. It does not intercept any events.
   std::unique_ptr<ui::FilteredGestureProvider> gesture_provider_;
   ui::GestureProviderConfigType gesture_provider_config_type_;
   bool double_tap_enabled_;
 
   // While emulation is on, default cursor is touch. Pressing shift changes
   // cursor to the pinch one.
+  bool use_2x_cursors_;

[tdresser, 2016/12/05 16:55:01]

Move up above comment?

[dgozman, 2016/12/05 18:56:32]

Done.

   WebCursor pointer_cursor_;
   WebCursor touch_cursor_;
   WebCursor pinch_cursor_;
   gfx::SizeF cursor_size_;
 
   // These are used to drop extra mouse move events coming too quickly, so
   // we don't handle too much touches in gesture provider.
   bool last_mouse_event_was_move_;
   double last_mouse_move_timestamp_;
 
@@ skipping 14 matching lines @@
   // The cumulative scale change from the start of pinch gesture.
   float pinch_scale_;
   bool pinch_gesture_active_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchEmulator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EMULATOR_H_