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
|
// Copyright 2012 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_WM_CORE_FOCUS_CONTROLLER_H_
#define UI_WM_CORE_FOCUS_CONTROLLER_H_
#include <memory>
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "base/scoped_multi_source_observation.h"
#include "base/strings/string_piece.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "ui/aura/client/focus_client.h"
#include "ui/aura/window_observer.h"
#include "ui/events/event_handler.h"
#include "ui/wm/public/activation_change_observer.h"
#include "ui/wm/public/activation_client.h"
namespace wm {
class FocusRules;
// FocusController handles focus and activation changes for an environment
// encompassing one or more RootWindows. Within an environment there can be
// only one focused and one active window at a time. When focus or activation
// changes notifications are sent using the
// aura::client::Focus/ActivationChangeObserver interfaces.
// Changes to focus and activation can be from three sources. The source can be
// determined by the ActivationReason parameter in
// ActivationChangeObserver::OnWindowActivated(...).
// . ActivationReason::ACTIVATION_CLIENT: The Aura Client API (implemented here
// in ActivationClient). (The FocusController must be set as the
// ActivationClient implementation for all RootWindows).
// . ActivationReason::INPUT_EVENT: Input events (implemented here in
// ui::EventHandler). (The FocusController must be registered as a pre-target
// handler for the applicable environment owner, either a RootWindow or
// another type).
// . ActivationReason::WINDOW_DISPOSITION_CHANGED: Window disposition changes
// (implemented here in aura::WindowObserver). (The FocusController registers
// itself as an observer of the active and focused windows).
class COMPONENT_EXPORT(UI_WM) FocusController : public ActivationClient,
public aura::client::FocusClient
,
public ui::EventHandler,
public aura::WindowObserver {
public:
// |rules| cannot be NULL.
explicit FocusController(FocusRules* rules);
FocusController(const FocusController&) = delete;
FocusController& operator=(const FocusController&) = delete;
~FocusController() override;
// Overridden from ActivationClient:
void AddObserver(ActivationChangeObserver* observer) override;
void RemoveObserver(ActivationChangeObserver* observer) override;
void ActivateWindow(aura::Window* window) override;
void DeactivateWindow(aura::Window* window) override;
const aura::Window* GetActiveWindow() const override;
aura::Window* GetActivatableWindow(aura::Window* window) const override;
const aura::Window* GetToplevelWindow(
const aura::Window* window) const override;
bool CanActivateWindow(const aura::Window* window) const override;
// Overridden from aura::client::FocusClient:
void AddObserver(aura::client::FocusChangeObserver* observer) override;
void RemoveObserver(aura::client::FocusChangeObserver* observer) override;
void FocusWindow(aura::Window* window) override;
void ResetFocusWithinActiveWindow(aura::Window* window) override;
aura::Window* GetFocusedWindow() override;
protected:
// Overridden from ui::EventHandler:
void OnKeyEvent(ui::KeyEvent* event) override;
void OnMouseEvent(ui::MouseEvent* event) override;
void OnScrollEvent(ui::ScrollEvent* event) override;
void OnTouchEvent(ui::TouchEvent* event) override;
void OnGestureEvent(ui::GestureEvent* event) override;
base::StringPiece GetLogContext() const override;
// Overridden from aura::WindowObserver:
void OnWindowVisibilityChanged(aura::Window* window, bool visible) override;
void OnWindowDestroying(aura::Window* window) override;
void OnWindowHierarchyChanging(const HierarchyChangeParams& params) override;
void OnWindowHierarchyChanged(const HierarchyChangeParams& params) override;
private:
// Internal implementation that coordinates window focus and activation
// changes.
void FocusAndActivateWindow(ActivationChangeObserver::ActivationReason reason,
aura::Window* window,
bool no_stacking);
// Internal implementation that sets the focused window, fires events etc.
// This function must be called with a valid focusable window.
void SetFocusedWindow(aura::Window* window);
// Internal implementation that sets the active window, fires events etc.
// This function must be called with a valid |activatable_window|.
// |requested_window| refers to the window that was passed in to an external
// request (e.g. FocusWindow or ActivateWindow). It may be NULL, e.g. if
// SetActiveWindow was not called by an external request. |activatable_window|
// refers to the actual window to be activated, which may be different.
// Returns true if activation should proceed, or false if activation was
// interrupted, e.g. by the destruction of the window gaining activation
// during the process, and therefore activation should be aborted. If
// |no_stacking| is true, the activated window is not stacked.
bool SetActiveWindow(ActivationChangeObserver::ActivationReason reason,
aura::Window* requested_window,
aura::Window* activatable_window,
bool no_stacking);
// Stack the |active_window_| on top of the window stack. This function is
// called when activating a window or re-activating the current active window.
void StackActiveWindow();
// Called when a window's disposition changed such that it and its hierarchy
// are no longer focusable/activatable. |next| is a valid window that is used
// as a starting point for finding a window to focus next based on rules.
void WindowLostFocusFromDispositionChange(aura::Window* window,
aura::Window* next);
// Called when an attempt is made to focus or activate a window via an input
// event targeted at that window. Rules determine the best focusable window
// for the input window.
void WindowFocusedFromInputEvent(aura::Window* window,
const ui::Event* event);
raw_ptr<aura::Window> active_window_ = nullptr;
raw_ptr<aura::Window> focused_window_ = nullptr;
bool updating_focus_ = false;
// An optional value. It is set to the window being activated and is unset
// after it is activated.
absl::optional<aura::Window*> pending_activation_;
std::unique_ptr<FocusRules> rules_;
base::ObserverList<ActivationChangeObserver>::Unchecked activation_observers_;
base::ObserverList<aura::client::FocusChangeObserver>::Unchecked
focus_observers_;
base::ScopedMultiSourceObservation<aura::Window, aura::WindowObserver>
observation_manager_{this};
// When true, windows can be activated (but not raised) without clicking.
bool focus_follows_cursor_ = false;
};
} // namespace wm
#endif // UI_WM_CORE_FOCUS_CONTROLLER_H_
|
