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
|
// Copyright 2015 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 "components/html_viewer/document_resource_waiter.h"
#include "components/html_viewer/global_state.h"
#include "components/html_viewer/html_document.h"
#include "components/html_viewer/html_frame_tree_manager.h"
#include "components/mus/public/cpp/view.h"
using web_view::ViewConnectType;
namespace html_viewer {
DocumentResourceWaiter::DocumentResourceWaiter(GlobalState* global_state,
mojo::URLResponsePtr response,
HTMLDocument* document)
: global_state_(global_state),
document_(document),
response_(response.Pass()),
root_(nullptr),
change_id_(0u),
view_id_(0u),
view_connect_type_(web_view::VIEW_CONNECT_TYPE_USE_NEW),
frame_tree_client_binding_(this),
is_ready_(false),
waiting_for_change_id_(false),
target_frame_tree_(nullptr) {}
DocumentResourceWaiter::~DocumentResourceWaiter() {
if (root_)
root_->RemoveObserver(this);
if (target_frame_tree_)
target_frame_tree_->RemoveObserver(this);
}
void DocumentResourceWaiter::Release(
mojo::InterfaceRequest<web_view::FrameTreeClient>*
frame_tree_client_request,
web_view::FrameTreeServerPtr* frame_tree_server,
mojo::Array<web_view::FrameDataPtr>* frame_data,
uint32_t* change_id,
uint32_t* view_id,
ViewConnectType* view_connect_type,
OnConnectCallback* on_connect_callback) {
DCHECK(is_ready_);
*frame_tree_client_request = frame_tree_client_request_.Pass();
*frame_tree_server = server_.Pass();
*frame_data = frame_data_.Pass();
*change_id = change_id_;
*view_id = view_id_;
*view_connect_type = view_connect_type_;
*on_connect_callback = on_connect_callback_;
}
mojo::URLResponsePtr DocumentResourceWaiter::ReleaseURLResponse() {
return response_.Pass();
}
void DocumentResourceWaiter::SetRoot(mojo::View* root) {
DCHECK(!root_);
root_ = root;
root_->AddObserver(this);
UpdateIsReady();
}
void DocumentResourceWaiter::Bind(
mojo::InterfaceRequest<web_view::FrameTreeClient> request) {
if (frame_tree_client_binding_.is_bound() || !frame_data_.is_null()) {
DVLOG(1) << "Request for FrameTreeClient after already supplied one";
return;
}
frame_tree_client_binding_.Bind(request.Pass());
}
void DocumentResourceWaiter::UpdateIsReady() {
if (is_ready_)
return;
// See description of |waiting_for_change_id_| for details.
if (waiting_for_change_id_) {
if (target_frame_tree_->change_id() == change_id_) {
is_ready_ = true;
waiting_for_change_id_ = false;
document_->Load();
}
return;
}
// The first portion of ready is when we have received OnConnect()
// (|frame_data_| is valid) and we have a view with valid metrics. The view
// is not necessary is ViewConnectType is USE_EXISTING, which means the
// application is not asked for a ViewTreeClient. The metrics are necessary
// to initialize ResourceBundle. If USE_EXISTING is true, it means a View has
// already been provided to another HTMLDocument and there is no need to wait
// for metrics.
bool is_ready =
(!frame_data_.is_null() &&
((view_connect_type_ == web_view::VIEW_CONNECT_TYPE_USE_EXISTING) ||
(root_ && root_->viewport_metrics().device_pixel_ratio != 0.0f)));
if (is_ready) {
HTMLFrameTreeManager* frame_tree =
HTMLFrameTreeManager::FindFrameTreeWithRoot(frame_data_[0]->frame_id);
// Once we've received OnConnect() and the view (if necessary), we determine
// which HTMLFrameTreeManager the new frame ends up in. If there is an
// existing HTMLFrameTreeManager then we must wait for the change_id
// supplied to OnConnect() to be <= that of the HTMLFrameTreeManager's
// change_id. If we did not wait for the change id to be <= then the
// structure of the tree is not in the expected state and it's possible the
// frame communicated in OnConnect() does not exist yet.
if (frame_tree && change_id_ > frame_tree->change_id()) {
waiting_for_change_id_ = true;
target_frame_tree_ = frame_tree;
target_frame_tree_->AddObserver(this);
} else {
is_ready_ = true;
document_->Load();
}
}
}
void DocumentResourceWaiter::OnConnect(
web_view::FrameTreeServerPtr server,
uint32_t change_id,
uint32_t view_id,
ViewConnectType view_connect_type,
mojo::Array<web_view::FrameDataPtr> frame_data,
const OnConnectCallback& callback) {
DCHECK(frame_data_.is_null());
change_id_ = change_id;
view_id_ = view_id;
view_connect_type_ = view_connect_type;
server_ = server.Pass();
frame_data_ = frame_data.Pass();
on_connect_callback_ = callback;
CHECK(frame_data_.size() > 0u);
frame_tree_client_request_ = frame_tree_client_binding_.Unbind();
UpdateIsReady();
}
void DocumentResourceWaiter::OnFrameAdded(uint32_t change_id,
web_view::FrameDataPtr frame_data) {
// It is assumed we receive OnConnect() (which unbinds) before anything else.
NOTREACHED();
}
void DocumentResourceWaiter::OnFrameRemoved(uint32_t change_id,
uint32_t frame_id) {
// It is assumed we receive OnConnect() (which unbinds) before anything else.
NOTREACHED();
}
void DocumentResourceWaiter::OnFrameClientPropertyChanged(
uint32_t frame_id,
const mojo::String& name,
mojo::Array<uint8_t> new_value) {
// It is assumed we receive OnConnect() (which unbinds) before anything else.
NOTREACHED();
}
void DocumentResourceWaiter::OnPostMessageEvent(
uint32_t source_frame_id,
uint32_t target_frame_id,
web_view::HTMLMessageEventPtr event) {
// It is assumed we receive OnConnect() (which unbinds) before anything else.
NOTREACHED();
}
void DocumentResourceWaiter::OnWillNavigate(uint32_t target_frame_id) {
// It is assumed we receive OnConnect() (which unbinds) before anything else.
NOTIMPLEMENTED();
}
void DocumentResourceWaiter::OnViewViewportMetricsChanged(
mojo::View* view,
const mojo::ViewportMetrics& old_metrics,
const mojo::ViewportMetrics& new_metrics) {
UpdateIsReady();
}
void DocumentResourceWaiter::OnViewDestroyed(mojo::View* view) {
root_->RemoveObserver(this);
root_ = nullptr;
}
void DocumentResourceWaiter::OnHTMLFrameTreeManagerChangeIdAdvanced() {
UpdateIsReady();
}
void DocumentResourceWaiter::OnHTMLFrameTreeManagerDestroyed() {
document_->Destroy(); // This destroys us.
}
} // namespace html_viewer
|
