1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/android/overscroll_controller_android.h"
#include "base/android/build_info.h"
#include "base/bind.h"
#include "cc/layers/layer.h"
#include "cc/output/compositor_frame_metadata.h"
#include "content/browser/android/edge_effect.h"
#include "content/browser/android/edge_effect_l.h"
#include "content/common/input/did_overscroll_params.h"
#include "content/public/browser/web_contents.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "ui/base/android/window_android_compositor.h"
namespace content {
namespace {
// Used for conditional creation of EdgeEffect types for the overscroll glow.
const int kAndroidLSDKVersion = 21;
scoped_ptr<EdgeEffectBase> CreateGlowEdgeEffect(
ui::SystemUIResourceManager* resource_manager,
float dpi_scale) {
DCHECK(resource_manager);
static bool use_l_flavoured_effect =
base::android::BuildInfo::GetInstance()->sdk_int() >= kAndroidLSDKVersion;
if (use_l_flavoured_effect)
return scoped_ptr<EdgeEffectBase>(new EdgeEffectL(resource_manager));
return scoped_ptr<EdgeEffectBase>(
new EdgeEffect(resource_manager, dpi_scale));
}
} // namespace
OverscrollControllerAndroid::OverscrollControllerAndroid(
WebContents* web_contents,
ui::WindowAndroidCompositor* compositor,
float dpi_scale)
: WebContentsObserver(web_contents),
compositor_(compositor),
dpi_scale_(dpi_scale),
enabled_(true),
glow_effect_(base::Bind(&CreateGlowEdgeEffect,
&compositor->GetSystemUIResourceManager(),
dpi_scale_)),
refresh_effect_(&compositor->GetSystemUIResourceManager(), this),
triggered_refresh_active_(false) {
DCHECK(web_contents);
}
OverscrollControllerAndroid::~OverscrollControllerAndroid() {
}
bool OverscrollControllerAndroid::WillHandleGestureEvent(
const blink::WebGestureEvent& event) {
if (!enabled_)
return false;
bool handled = false;
bool maybe_needs_animate = false;
switch (event.type) {
case blink::WebInputEvent::GestureScrollBegin:
refresh_effect_.OnScrollBegin();
break;
case blink::WebInputEvent::GestureScrollUpdate: {
gfx::Vector2dF scroll_delta(event.data.scrollUpdate.deltaX,
event.data.scrollUpdate.deltaY);
scroll_delta.Scale(dpi_scale_);
maybe_needs_animate = true;
handled = refresh_effect_.WillHandleScrollUpdate(scroll_delta);
} break;
case blink::WebInputEvent::GestureScrollEnd:
refresh_effect_.OnScrollEnd(gfx::Vector2dF());
maybe_needs_animate = true;
break;
case blink::WebInputEvent::GestureFlingStart: {
gfx::Vector2dF scroll_velocity(event.data.flingStart.velocityX,
event.data.flingStart.velocityY);
scroll_velocity.Scale(dpi_scale_);
refresh_effect_.OnScrollEnd(scroll_velocity);
if (refresh_effect_.IsActive()) {
// TODO(jdduke): Figure out a cleaner way of suppressing a fling.
// It's important that the any downstream code sees a scroll-ending
// event (in this case GestureFlingStart) if it has seen a scroll begin.
// Thus, we cannot simply consume the fling. Changing the event type to
// a GestureScrollEnd might work in practice, but could lead to
// unexpected results. For now, simply truncate the fling velocity, but
// not to zero as downstream code may not expect a zero-velocity fling.
blink::WebGestureEvent& modified_event =
const_cast<blink::WebGestureEvent&>(event);
modified_event.data.flingStart.velocityX = .01f;
modified_event.data.flingStart.velocityY = .01f;
}
maybe_needs_animate = true;
} break;
default:
break;
}
if (maybe_needs_animate && refresh_effect_.IsActive())
SetNeedsAnimate();
return handled;
}
void OverscrollControllerAndroid::OnGestureEventAck(
const blink::WebGestureEvent& event,
InputEventAckState ack_result) {
if (!enabled_)
return;
// The overscroll effect requires an explicit release signal that may not be
// sent from the renderer compositor.
if (event.type == blink::WebInputEvent::GestureScrollEnd ||
event.type == blink::WebInputEvent::GestureFlingStart) {
OnOverscrolled(DidOverscrollParams());
}
if (event.type == blink::WebInputEvent::GestureScrollUpdate) {
// The effect should only be allowed if both the causal touch events go
// unconsumed and the generated scroll events go unconsumed.
// TODO(jdduke): Prevent activation if the first touchmove was consumed,
// i.e., the first GSU was prevented.
bool consumed = ack_result == INPUT_EVENT_ACK_STATE_CONSUMED;
refresh_effect_.OnScrollUpdateAck(consumed);
}
}
void OverscrollControllerAndroid::OnOverscrolled(
const DidOverscrollParams& params) {
if (!enabled_)
return;
if (refresh_effect_.IsActive() ||
refresh_effect_.IsAwaitingScrollUpdateAck()) {
// An active (or potentially active) refresh effect should always pre-empt
// the passive glow effect.
return;
}
if (glow_effect_.OnOverscrolled(
base::TimeTicks::Now(),
gfx::ScaleVector2d(params.accumulated_overscroll, dpi_scale_),
gfx::ScaleVector2d(params.latest_overscroll_delta, dpi_scale_),
gfx::ScaleVector2d(params.current_fling_velocity, dpi_scale_),
gfx::ScaleVector2d(params.causal_event_viewport_point.OffsetFromOrigin(),
dpi_scale_))) {
SetNeedsAnimate();
}
}
bool OverscrollControllerAndroid::Animate(base::TimeTicks current_time,
cc::Layer* parent_layer) {
DCHECK(parent_layer);
if (!enabled_)
return false;
bool needs_animate = refresh_effect_.Animate(current_time, parent_layer);
needs_animate |= glow_effect_.Animate(current_time, parent_layer);
return needs_animate;
}
void OverscrollControllerAndroid::OnFrameMetadataUpdated(
const cc::CompositorFrameMetadata& frame_metadata) {
const float scale_factor =
frame_metadata.page_scale_factor * frame_metadata.device_scale_factor;
gfx::SizeF viewport_size =
gfx::ScaleSize(frame_metadata.scrollable_viewport_size, scale_factor);
gfx::SizeF content_size =
gfx::ScaleSize(frame_metadata.root_layer_size, scale_factor);
gfx::Vector2dF content_scroll_offset =
gfx::ScaleVector2d(frame_metadata.root_scroll_offset, scale_factor);
refresh_effect_.UpdateDisplay(viewport_size, content_scroll_offset);
glow_effect_.UpdateDisplay(viewport_size, content_size,
content_scroll_offset);
}
void OverscrollControllerAndroid::Enable() {
enabled_ = true;
}
void OverscrollControllerAndroid::Disable() {
if (!enabled_)
return;
enabled_ = false;
if (!enabled_) {
refresh_effect_.Reset();
glow_effect_.Reset();
}
}
void OverscrollControllerAndroid::DidNavigateMainFrame(
const LoadCommittedDetails& details,
const FrameNavigateParams& params) {
// Once the main frame has navigated, there's little need to further animate
// the reload effect. Note that the effect will naturally time out should the
// reload be interruped for any reason.
triggered_refresh_active_ = false;
}
void OverscrollControllerAndroid::TriggerRefresh() {
triggered_refresh_active_ = false;
if (!web_contents())
return;
triggered_refresh_active_ = true;
web_contents()->ReloadFocusedFrame(false);
}
bool OverscrollControllerAndroid::IsStillRefreshing() const {
return triggered_refresh_active_;
}
void OverscrollControllerAndroid::SetNeedsAnimate() {
compositor_->SetNeedsAnimate();
}
} // namespace content
|
