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
15using blink::WebInputEvent;
16using blink::WebTouchEvent;
17using blink::WebTouchPoint;
18using blink::WebMouseEvent;
19using blink::WebMouseWheelEvent;
20
21namespace content {
22namespace {
23
24// This value was determined experimentally. It was sufficient to not cause a
25// fling on Android and Aura.
26const 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.
31const float kTouchSlopInDips = 0.0f;
32
33}  // namespace
34
35SyntheticGestureTargetBase::SyntheticGestureTargetBase(
36    RenderWidgetHostImpl* host)
37    : host_(host) {
38  DCHECK(host);
39}
40
41SyntheticGestureTargetBase::~SyntheticGestureTargetBase() {
42}
43
44void 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
85void 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
94void SyntheticGestureTargetBase::DispatchWebMouseWheelEventToPlatform(
95      const blink::WebMouseWheelEvent& web_wheel,
96      const ui::LatencyInfo& latency_info) {
97  host_->ForwardWheelEventWithLatencyInfo(web_wheel, latency_info);
98}
99
100void SyntheticGestureTargetBase::DispatchWebMouseEventToPlatform(
101      const blink::WebMouseEvent& web_mouse,
102      const ui::LatencyInfo& latency_info) {
103  host_->ForwardMouseEventWithLatencyInfo(web_mouse, latency_info);
104}
105
106void SyntheticGestureTargetBase::SetNeedsFlush() {
107  host_->SetNeedsFlush();
108}
109
110SyntheticGestureParams::GestureSourceType
111SyntheticGestureTargetBase::GetDefaultSyntheticGestureSourceType() const {
112  return SyntheticGestureParams::MOUSE_INPUT;
113}
114
115base::TimeDelta SyntheticGestureTargetBase::PointerAssumedStoppedTime()
116    const {
117  return base::TimeDelta::FromMilliseconds(kPointerAssumedStoppedTimeMs);
118}
119
120float SyntheticGestureTargetBase::GetTouchSlopInDips() const {
121  return kTouchSlopInDips;
122}
123
124float 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
131bool 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
138