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
|
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/thumbnails/thumbnail_readiness_tracker.h"
#include <utility>
#include "content/public/browser/navigation_handle.h"
namespace {
bool NavigationShouldInvalidateThumbnail(
content::NavigationHandle* navigation) {
// Ignore subframe navigations.
if (!navigation->IsInPrimaryMainFrame())
return false;
// Some navigations change the tab URL but don't create a new
// document. They aren't considered loading; onload is never triggered
// after they complete. They shouldn't affect the thumbnail.
//
// See crbug.com/1120940 for why this is necessary.
if (navigation->IsSameDocument())
return false;
return true;
}
} // namespace
ThumbnailReadinessTracker::ThumbnailReadinessTracker(
content::WebContents* web_contents,
ReadinessChangeCallback callback)
: content::WebContentsObserver(web_contents),
callback_(std::move(callback)) {
DCHECK(callback_);
}
ThumbnailReadinessTracker::~ThumbnailReadinessTracker() = default;
void ThumbnailReadinessTracker::DidStartNavigation(
content::NavigationHandle* navigation_handle) {
if (!NavigationShouldInvalidateThumbnail(navigation_handle))
return;
pending_navigation_ = navigation_handle;
UpdateReadiness(Readiness::kNotReady);
}
void ThumbnailReadinessTracker::DidFinishNavigation(
content::NavigationHandle* navigation_handle) {
// Only respond to the last navigation handled by DidStartNavigation.
// Others may be unimportant or outdated.
if (navigation_handle != pending_navigation_)
return;
pending_navigation_ = nullptr;
UpdateReadiness(Readiness::kReadyForInitialCapture);
if (last_readiness_ > Readiness::kReadyForInitialCapture)
return;
UpdateReadiness(Readiness::kReadyForInitialCapture);
}
void ThumbnailReadinessTracker::DocumentOnLoadCompletedInPrimaryMainFrame() {
UpdateReadiness(Readiness::kReadyForFinalCapture);
}
void ThumbnailReadinessTracker::WebContentsDestroyed() {
pending_navigation_ = nullptr;
UpdateReadiness(Readiness::kNotReady);
}
void ThumbnailReadinessTracker::UpdateReadiness(Readiness readiness) {
if (readiness == last_readiness_)
return;
// If the WebContents is closing, it shouldn't be captured.
if (web_contents()->IsBeingDestroyed())
readiness = Readiness::kNotReady;
last_readiness_ = readiness;
callback_.Run(readiness);
}
|
