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
|
// Copyright 2013 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_WIDGET_WINDOW_REORDERER_H_
#define UI_VIEWS_WIDGET_WINDOW_REORDERER_H_
#include <memory>
#include "base/scoped_observation.h"
#include "ui/aura/window_observer.h"
#include "ui/views/view_observer.h"
namespace aura {
class Window;
}
namespace views {
class View;
// Class which reorders the widget's child windows which have an associated view
// in the widget's view tree according the z-order of the views in the view
// tree. Windows not associated to a view are stacked above windows with an
// associated view. The child windows' layers are additionally reordered
// according to the z-order of the associated views relative to views with
// layers.
class WindowReorderer : public aura::WindowObserver, public ViewObserver {
public:
WindowReorderer(aura::Window* window, View* root_view);
WindowReorderer(const WindowReorderer&) = delete;
WindowReorderer& operator=(const WindowReorderer&) = delete;
~WindowReorderer() override;
// Explicitly reorder the children of |window_| (and their layers). This
// method should be called when the position of a view with an associated
// window changes in the view hierarchy. This method assumes that the
// child layers of |window_| which are owned by views are already in the
// correct z-order relative to each other and does no reordering if there
// are no views with an associated window.
void ReorderChildWindows();
private:
// aura::WindowObserver overrides:
void OnWindowAdded(aura::Window* new_window) override;
void OnWillRemoveWindow(aura::Window* window) override;
void OnWindowDestroying(aura::Window* window) override;
// ViewObserver:
void OnViewIsDeleting(View* observed_view) override;
// The observation of the window of native widget that owns `this`.
base::ScopedObservation<aura::Window, aura::WindowObserver>
parent_window_observation_{this};
// The observation of the root view of the native widget that owns `this`.
base::ScopedObservation<View, ViewObserver> view_observation_{this};
// Reorders windows as a result of the kHostViewKey being set on a child of
// |parent_window_|.
class AssociationObserver;
std::unique_ptr<AssociationObserver> association_observer_;
};
} // namespace views
#endif // UI_VIEWS_WIDGET_WINDOW_REORDERER_H_
|
