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
|
// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_VIEWS_VIEW_TRACKER_H_
#define UI_VIEWS_VIEW_TRACKER_H_
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/scoped_observation.h"
#include "ui/views/view_observer.h"
#include "ui/views/views_export.h"
namespace views {
class View;
// ViewTracker tracks a single View. When the View is deleted it's removed.
class VIEWS_EXPORT ViewTracker : public ViewObserver {
public:
explicit ViewTracker(View* view = nullptr);
ViewTracker(const ViewTracker&) = delete;
ViewTracker& operator=(const ViewTracker&) = delete;
~ViewTracker() override;
void SetView(View* view);
View* view() { return view_; }
const View* view() const { return view_; }
// If `track_entire_view_hierarchy_` is true this will be run before
// destruction of the view hierarchy. If `track_entire_view_hierarchy_` is
// false the callback will be run right before the view itself will be deleted
// (child views will already be destroyed at that point).
void SetIsDeletingCallback(base::OnceClosure is_deleting_callback);
// If set to true, the view tracker will remove the view it is tracking before
// destruction of the view hierarchy, including child views, starts.
void SetTrackEntireViewHierarchy(bool track_entire_view_hierarchy) {
track_entire_view_hierarchy_ = track_entire_view_hierarchy;
}
operator bool() const { return !!view_; }
// ViewObserver:
void OnViewIsDeleting(View* observed_view) override;
void OnViewHierarchyWillBeDeleted(View* observed_view) override;
private:
void HandleViewDestruction();
raw_ptr<View> view_ = nullptr;
base::OnceClosure is_deleting_callback_;
bool track_entire_view_hierarchy_ = false;
base::ScopedObservation<View, ViewObserver> observation_{this};
};
} // namespace views
#endif // UI_VIEWS_VIEW_TRACKER_H_
|
