content/browser/renderer_host/input/synthetic_gesture_target_base.cc

   1 // Copyright 2013 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/input/synthetic_gesture_target_base.h"
   6
   7 #include "content/browser/renderer_host/render_widget_host_impl.h"
   8 #include "content/browser/renderer_host/render_widget_host_view_base.h"
   9 #include "content/browser/renderer_host/ui_events_helper.h"
  10 #include "content/common/input_messages.h"
  11 #include "third_party/WebKit/public/web/WebInputEvent.h"
  12 #include "ui/events/event.h"
  13 #include "ui/events/latency_info.h"
  14
  15 using blink::WebInputEvent;
  16 using blink::WebTouchEvent;
  17 using blink::WebTouchPoint;
  18 using blink::WebMouseEvent;
  19 using blink::WebMouseWheelEvent;
  20
  21 namespace content {
  22 namespace {
  23
  24 // This value was determined experimentally. It was sufficient to not cause a
  25 // fling on Android and Aura.
  26 const int kPointerAssumedStoppedTimeMs = 100;
  27
  28 // SyntheticGestureTargetBase passes input events straight on to the renderer
  29 // without going through a gesture recognition framework. There is thus no touch
  30 // slop.
  31 const float kTouchSlopInDips = 0.0f;
  32
  33 }  // namespace
  34
  35 SyntheticGestureTargetBase::SyntheticGestureTargetBase(
  36     RenderWidgetHostImpl* host)
  37     : host_(host) {
  38   DCHECK(host);
  39 }
  40
  41 SyntheticGestureTargetBase::~SyntheticGestureTargetBase() {
  42 }
  43
  44 void SyntheticGestureTargetBase::DispatchInputEventToPlatform(
  45     const WebInputEvent& event) {
  46   TRACE_EVENT1("input",
  47                "SyntheticGestureTarget::DispatchInputEventToPlatform",
  48                "type", WebInputEventTraits::GetName(event.type));
  49
  50   ui::LatencyInfo latency_info;
  51   latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
  52
  53   if (WebInputEvent::isTouchEventType(event.type)) {
  54     const WebTouchEvent& web_touch =
  55         static_cast<const WebTouchEvent&>(event);
  56
  57     // Check that all touch pointers are within the content bounds.
  58     if (web_touch.type == WebInputEvent::TouchStart) {
  59       for (unsigned i = 0; i < web_touch.touchesLength; i++)
  60         CHECK(web_touch.touches[i].state != WebTouchPoint::StatePressed ||
  61               PointIsWithinContents(web_touch.touches[i].position.x,
  62                                     web_touch.touches[i].position.y))
  63             << "Touch coordinates are not within content bounds on TouchStart.";
  64     }
  65
  66     DispatchWebTouchEventToPlatform(web_touch, latency_info);
  67   } else if (event.type == WebInputEvent::MouseWheel) {
  68     const WebMouseWheelEvent& web_wheel =
  69         static_cast<const WebMouseWheelEvent&>(event);
  70     CHECK(PointIsWithinContents(web_wheel.x, web_wheel.y))
  71         << "Mouse wheel position is not within content bounds.";
  72     DispatchWebMouseWheelEventToPlatform(web_wheel, latency_info);
  73   } else if (WebInputEvent::isMouseEventType(event.type)) {
  74     const WebMouseEvent& web_mouse =
  75         static_cast<const WebMouseEvent&>(event);
  76     CHECK(event.type != WebInputEvent::MouseDown ||
  77           PointIsWithinContents(web_mouse.x, web_mouse.y))
  78         << "Mouse pointer is not within content bounds on MouseDown.";
  79     DispatchWebMouseEventToPlatform(web_mouse, latency_info);
  80   } else {
  81     NOTREACHED();
  82   }
  83 }
  84
  85 void SyntheticGestureTargetBase::DispatchWebTouchEventToPlatform(
  86       const blink::WebTouchEvent& web_touch,
  87       const ui::LatencyInfo& latency_info) {
  88   // We assume that platforms supporting touch have their own implementation of
  89   // SyntheticGestureTarget to route the events through their respective input
  90   // stack.
  91   CHECK(false) << "Touch events not supported for this browser.";
  92 }
  93
  94 void SyntheticGestureTargetBase::DispatchWebMouseWheelEventToPlatform(
  95       const blink::WebMouseWheelEvent& web_wheel,
  96       const ui::LatencyInfo& latency_info) {
  97   host_->ForwardWheelEventWithLatencyInfo(web_wheel, latency_info);
  98 }
  99
 100 void SyntheticGestureTargetBase::DispatchWebMouseEventToPlatform(
 101       const blink::WebMouseEvent& web_mouse,
 102       const ui::LatencyInfo& latency_info) {
 103   host_->ForwardMouseEventWithLatencyInfo(web_mouse, latency_info);
 104 }
 105
 106 void SyntheticGestureTargetBase::SetNeedsFlush() {
 107   host_->SetNeedsFlush();
 108 }
 109
 110 SyntheticGestureParams::GestureSourceType
 111 SyntheticGestureTargetBase::GetDefaultSyntheticGestureSourceType() const {
 112   return SyntheticGestureParams::MOUSE_INPUT;
 113 }
 114
 115 base::TimeDelta SyntheticGestureTargetBase::PointerAssumedStoppedTime()
 116     const {
 117   return base::TimeDelta::FromMilliseconds(kPointerAssumedStoppedTimeMs);
 118 }
 119
 120 float SyntheticGestureTargetBase::GetTouchSlopInDips() const {
 121   return kTouchSlopInDips;
 122 }
 123
 124 float SyntheticGestureTargetBase::GetMinScalingSpanInDips() const {
 125   // The minimum scaling distance is only relevant for touch gestures and the
 126   // base target doesn't support touch.
 127   NOTREACHED();
 128   return 0.0f;
 129 }
 130
 131 bool SyntheticGestureTargetBase::PointIsWithinContents(int x, int y) const {
 132   gfx::Rect bounds = host_->GetView()->GetViewBounds();
 133   bounds -= bounds.OffsetFromOrigin();  // Translate the bounds to (0,0).
 134   return bounds.Contains(x, y);
 135 }
 136
 137 }  // namespace content