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
|
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_PERFORMANCE_CONTROLS_HIGH_EFFICIENCY_CHIP_TAB_HELPER_H_
#define CHROME_BROWSER_UI_PERFORMANCE_CONTROLS_HIGH_EFFICIENCY_CHIP_TAB_HELPER_H_
#include "chrome/browser/resource_coordinator/lifecycle_unit_state.mojom-shared.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/render_widget_host.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
namespace high_efficiency {
enum class ChipState {
// Chip is not shown for this tab.
HIDDEN,
// Chip is rendered in a collapsed state with not text.
COLLAPSED,
// Chip expands to educate about the memory saver feature.
EXPANDED_EDUCATION,
// Chip expands to highlight large savings from a previously discarded tab.
EXPANDED_WITH_SAVINGS,
// Previously expanded chip is collapsed due to tab switching.
COLLAPSED_FROM_EXPANDED,
};
} // namespace high_efficiency
// When a page in the background has been discarded due to high efficiency mode,
// and the user returns to that tab, a page action chip should be shown to the
// user which conveys information about the discarded tab to the user.
// The HighEfficiencyChipTabHelper is a per-tab class which manages the state of
// the high efficiency chip.
class HighEfficiencyChipTabHelper
: public content::WebContentsObserver,
public content::WebContentsUserData<HighEfficiencyChipTabHelper> {
public:
HighEfficiencyChipTabHelper(const HighEfficiencyChipTabHelper&) = delete;
HighEfficiencyChipTabHelper& operator=(const HighEfficiencyChipTabHelper&) =
delete;
~HighEfficiencyChipTabHelper() override;
static constexpr int kChipAnimationCount = 3;
high_efficiency::ChipState chip_state() const { return chip_state_; }
// content::WebContentsObserver
void DidStartNavigation(
content::NavigationHandle* navigation_handle) override;
void OnVisibilityChanged(content::Visibility visibility) override;
// Returns whether the tab associated with this helper has been navigated
// away from and to another tab.
bool ShouldChipAnimate();
private:
friend class content::WebContentsUserData<HighEfficiencyChipTabHelper>;
explicit HighEfficiencyChipTabHelper(content::WebContents* contents);
// Checks whether a promotional expanded chip should be shown to highlight
// memory savings and, if so, update prefs to reflect that it is shown.
bool ComputeShouldHighlightMemorySavings();
// Checks whether an educational expanded chip should be shown about the
// feature and, if so, update prefs to reflect that it is shown.
bool ComputeShouldEducateAboutMemorySavings();
// Computes and updates the `chip_state_` based on information about the
// recent navigation.
void ComputeChipState(content::NavigationHandle* navigation_handle);
high_efficiency::ChipState chip_state_ = high_efficiency::ChipState::HIDDEN;
// Represents whether the current chip state has been properly rendered. This
// gets reset when a tab gets hidden so the chip can be redrawn.
bool was_rendered_ = false;
raw_ptr<PrefService> pref_service_;
WEB_CONTENTS_USER_DATA_KEY_DECL();
};
#endif // CHROME_BROWSER_UI_PERFORMANCE_CONTROLS_HIGH_EFFICIENCY_CHIP_TAB_HELPER_H_
|
