content/browser/renderer_host/ui_events_helper.cc

   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/ui_events_helper.h"
   6
   7 #include "content/browser/renderer_host/input/web_input_event_util.h"
   8 #include "content/common/input/web_touch_event_traits.h"
   9 #include "third_party/WebKit/public/web/WebInputEvent.h"
  10 #include "ui/events/blink/blink_event_util.h"
  11 #include "ui/events/event.h"
  12 #include "ui/events/event_constants.h"
  13
  14 namespace {
  15
  16 ui::EventType WebTouchPointStateToEventType(
  17     blink::WebTouchPoint::State state) {
  18   switch (state) {
  19     case blink::WebTouchPoint::StateReleased:
  20       return ui::ET_TOUCH_RELEASED;
  21
  22     case blink::WebTouchPoint::StatePressed:
  23       return ui::ET_TOUCH_PRESSED;
  24
  25     case blink::WebTouchPoint::StateMoved:
  26       return ui::ET_TOUCH_MOVED;
  27
  28     case blink::WebTouchPoint::StateCancelled:
  29       return ui::ET_TOUCH_CANCELLED;
  30
  31     default:
  32       return ui::ET_UNKNOWN;
  33   }
  34 }
  35
  36 }  // namespace
  37
  38 namespace content {
  39
  40 bool MakeUITouchEventsFromWebTouchEvents(
  41     const TouchEventWithLatencyInfo& touch_with_latency,
  42     ScopedVector<ui::TouchEvent>* list,
  43     TouchEventCoordinateSystem coordinate_system) {
  44   const blink::WebTouchEvent& touch = touch_with_latency.event;
  45   ui::EventType type = ui::ET_UNKNOWN;
  46   switch (touch.type) {
  47     case blink::WebInputEvent::TouchStart:
  48       type = ui::ET_TOUCH_PRESSED;
  49       break;
  50     case blink::WebInputEvent::TouchEnd:
  51       type = ui::ET_TOUCH_RELEASED;
  52       break;
  53     case blink::WebInputEvent::TouchMove:
  54       type = ui::ET_TOUCH_MOVED;
  55       break;
  56     case blink::WebInputEvent::TouchCancel:
  57       type = ui::ET_TOUCH_CANCELLED;
  58       break;
  59     default:
  60       NOTREACHED();
  61       return false;
  62   }
  63
  64   int flags = WebEventModifiersToEventFlags(touch.modifiers);
  65   base::TimeDelta timestamp = base::TimeDelta::FromMicroseconds(
  66       static_cast<int64>(touch.timeStampSeconds * 1000000));
  67   for (unsigned i = 0; i < touch.touchesLength; ++i) {
  68     const blink::WebTouchPoint& point = touch.touches[i];
  69     if (WebTouchPointStateToEventType(point.state) != type)
  70       continue;
  71     // ui events start in the co-ordinate space of the EventDispatcher.
  72     gfx::PointF location;
  73     if (coordinate_system == LOCAL_COORDINATES)
  74       location = point.position;
  75     else
  76       location = point.screenPosition;
  77     ui::TouchEvent* uievent = new ui::TouchEvent(type,
  78           location,
  79           flags,
  80           point.id,
  81           timestamp,
  82           point.radiusX,
  83           point.radiusY,
  84           point.rotationAngle,
  85           point.force);
  86     uievent->set_latency(touch_with_latency.latency);
  87     list->push_back(uievent);
  88   }
  89   return true;
  90 }
  91
  92 blink::WebGestureEvent MakeWebGestureEventFromUIEvent(
  93     const ui::GestureEvent& event) {
  94   return ui::CreateWebGestureEvent(event.details(), event.time_stamp(),
  95                                    event.location_f(), event.root_location_f(),
  96                                    event.flags());
  97 }
  98
  99 }  // namespace content