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
SyntheticGestureTargetBase(RenderWidgetHostImpl * host)35 SyntheticGestureTargetBase::SyntheticGestureTargetBase(
36 RenderWidgetHostImpl* host)
37 : host_(host) {
38 DCHECK(host);
39 }
40
~SyntheticGestureTargetBase()41 SyntheticGestureTargetBase::~SyntheticGestureTargetBase() {
42 }
43
DispatchInputEventToPlatform(const WebInputEvent & event)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
DispatchWebTouchEventToPlatform(const blink::WebTouchEvent & web_touch,const ui::LatencyInfo & latency_info)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
DispatchWebMouseWheelEventToPlatform(const blink::WebMouseWheelEvent & web_wheel,const ui::LatencyInfo & latency_info)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
DispatchWebMouseEventToPlatform(const blink::WebMouseEvent & web_mouse,const ui::LatencyInfo & latency_info)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
SetNeedsFlush()106 void SyntheticGestureTargetBase::SetNeedsFlush() {
107 host_->SetNeedsFlush();
108 }
109
110 SyntheticGestureParams::GestureSourceType
GetDefaultSyntheticGestureSourceType() const111 SyntheticGestureTargetBase::GetDefaultSyntheticGestureSourceType() const {
112 return SyntheticGestureParams::MOUSE_INPUT;
113 }
114
PointerAssumedStoppedTime() const115 base::TimeDelta SyntheticGestureTargetBase::PointerAssumedStoppedTime()
116 const {
117 return base::TimeDelta::FromMilliseconds(kPointerAssumedStoppedTimeMs);
118 }
119
GetTouchSlopInDips() const120 float SyntheticGestureTargetBase::GetTouchSlopInDips() const {
121 return kTouchSlopInDips;
122 }
123
GetMinScalingSpanInDips() const124 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
PointIsWithinContents(int x,int y) const131 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
138