content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.cc - Issue 62443007: Replace old with new synthetic gesture framework.

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Side by Side Diff: content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.cc

Issue 62443007: Replace old with new synthetic gesture framework. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: opt_mouse_move_event_x/y -> opt_start_x/y Created 7 years, 1 month ago

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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

2 // Use of this source code is governed by a BSD-style license that can be

3 // found in the LICENSE file.

4

5 #include "content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture. h"

6

7 #include "base/debug/trace_event.h"

8 #include "content/browser/renderer_host/render_widget_host_impl.h"

9

10 namespace content {

11

12 BasicMouseWheelSmoothScrollGesture::BasicMouseWheelSmoothScrollGesture(

13 bool scroll_down, int pixels_to_scroll,

14 int mouse_event_x, int mouse_event_y)

15 : scroll_down_(scroll_down),

16 pixels_scrolled_(0),

17 pixels_to_scroll_(pixels_to_scroll),

18 mouse_event_x_(mouse_event_x),

19 mouse_event_y_(mouse_event_y) { }

20

21 BasicMouseWheelSmoothScrollGesture::~BasicMouseWheelSmoothScrollGesture() { }

22

23 bool BasicMouseWheelSmoothScrollGesture::ForwardInputEvents(

24 base::TimeTicks now, RenderWidgetHost* host) {

25

26 if (pixels_scrolled_ >= pixels_to_scroll_)

27 return false;

28

29 float position_delta = synthetic_gesture_calculator_.GetDelta(

30 now,

31 RenderWidgetHostImpl::From(host)->GetSyntheticGestureMessageInterval());

32

33

34 blink::WebMouseWheelEvent event;

35 event.type = blink::WebInputEvent::MouseWheel;

36 event.hasPreciseScrollingDeltas = 0;

37 event.deltaY = scroll_down_ ? -position_delta : position_delta;

38 // TODO(vollick): find a proper way to access

39 // WebCore::WheelEvent::tickMultiplier.

40 event.wheelTicksY = event.deltaY / 120;

41 event.modifiers = 0;

42

43 // TODO(nduca): Figure out plausible x and y values.

44 event.globalX = 0;

45 event.globalY = 0;

46 event.x = mouse_event_x_;

47 event.y = mouse_event_y_;

48 event.windowX = event.x;

49 event.windowY = event.y;

50 host->ForwardWheelEvent(event);

51

52 pixels_scrolled_ += abs(event.deltaY);

53

54 TRACE_COUNTER_ID1(

55 "gpu", "smooth_scroll_by_pixels_scrolled", this, pixels_scrolled_);

56

57 return true;

58 }

59

60 } // content

61

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