1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "ui/wm/core/default_activation_client.h"
6
7 #include "ui/aura/window.h"
8 #include "ui/wm/public/activation_change_observer.h"
9 #include "ui/wm/public/activation_delegate.h"
10
11 namespace wm {
12
13 // Takes care of observing root window destruction & destroying the client.
14 class DefaultActivationClient::Deleter : public aura::WindowObserver {
15 public:
Deleter(DefaultActivationClient * client,aura::Window * root_window)16 Deleter(DefaultActivationClient* client, aura::Window* root_window)
17 : client_(client),
18 root_window_(root_window) {
19 root_window_->AddObserver(this);
20 }
21
22 private:
~Deleter()23 virtual ~Deleter() {}
24
25 // Overridden from WindowObserver:
OnWindowDestroyed(aura::Window * window)26 virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE {
27 DCHECK_EQ(window, root_window_);
28 root_window_->RemoveObserver(this);
29 delete client_;
30 delete this;
31 }
32
33 DefaultActivationClient* client_;
34 aura::Window* root_window_;
35
36 DISALLOW_COPY_AND_ASSIGN(Deleter);
37 };
38
39 ////////////////////////////////////////////////////////////////////////////////
40 // DefaultActivationClient, public:
41
DefaultActivationClient(aura::Window * root_window)42 DefaultActivationClient::DefaultActivationClient(aura::Window* root_window)
43 : last_active_(NULL) {
44 aura::client::SetActivationClient(root_window, this);
45 new Deleter(this, root_window);
46 }
47
48 ////////////////////////////////////////////////////////////////////////////////
49 // DefaultActivationClient, client::ActivationClient implementation:
50
AddObserver(aura::client::ActivationChangeObserver * observer)51 void DefaultActivationClient::AddObserver(
52 aura::client::ActivationChangeObserver* observer) {
53 observers_.AddObserver(observer);
54 }
55
RemoveObserver(aura::client::ActivationChangeObserver * observer)56 void DefaultActivationClient::RemoveObserver(
57 aura::client::ActivationChangeObserver* observer) {
58 observers_.RemoveObserver(observer);
59 }
60
ActivateWindow(aura::Window * window)61 void DefaultActivationClient::ActivateWindow(aura::Window* window) {
62 aura::Window* last_active = GetActiveWindow();
63 if (last_active == window)
64 return;
65
66 last_active_ = last_active;
67 RemoveActiveWindow(window);
68 active_windows_.push_back(window);
69 window->parent()->StackChildAtTop(window);
70 window->AddObserver(this);
71
72 FOR_EACH_OBSERVER(aura::client::ActivationChangeObserver,
73 observers_,
74 OnWindowActivated(window, last_active));
75
76 aura::client::ActivationChangeObserver* observer =
77 aura::client::GetActivationChangeObserver(last_active);
78 if (observer)
79 observer->OnWindowActivated(window, last_active);
80 observer = aura::client::GetActivationChangeObserver(window);
81 if (observer)
82 observer->OnWindowActivated(window, last_active);
83 }
84
DeactivateWindow(aura::Window * window)85 void DefaultActivationClient::DeactivateWindow(aura::Window* window) {
86 aura::client::ActivationChangeObserver* observer =
87 aura::client::GetActivationChangeObserver(window);
88 if (observer)
89 observer->OnWindowActivated(NULL, window);
90 if (last_active_)
91 ActivateWindow(last_active_);
92 }
93
GetActiveWindow()94 aura::Window* DefaultActivationClient::GetActiveWindow() {
95 if (active_windows_.empty())
96 return NULL;
97 return active_windows_.back();
98 }
99
GetActivatableWindow(aura::Window * window)100 aura::Window* DefaultActivationClient::GetActivatableWindow(
101 aura::Window* window) {
102 return NULL;
103 }
104
GetToplevelWindow(aura::Window * window)105 aura::Window* DefaultActivationClient::GetToplevelWindow(aura::Window* window) {
106 return NULL;
107 }
108
CanActivateWindow(aura::Window * window) const109 bool DefaultActivationClient::CanActivateWindow(aura::Window* window) const {
110 return true;
111 }
112
113 ////////////////////////////////////////////////////////////////////////////////
114 // DefaultActivationClient, aura::WindowObserver implementation:
115
OnWindowDestroyed(aura::Window * window)116 void DefaultActivationClient::OnWindowDestroyed(aura::Window* window) {
117 if (window == last_active_)
118 last_active_ = NULL;
119
120 if (window == GetActiveWindow()) {
121 active_windows_.pop_back();
122 aura::Window* next_active = GetActiveWindow();
123 if (next_active && aura::client::GetActivationChangeObserver(next_active)) {
124 aura::client::GetActivationChangeObserver(next_active)->OnWindowActivated(
125 next_active, NULL);
126 }
127 return;
128 }
129
130 RemoveActiveWindow(window);
131 }
132
133 ////////////////////////////////////////////////////////////////////////////////
134 // DefaultActivationClient, private:
135
~DefaultActivationClient()136 DefaultActivationClient::~DefaultActivationClient() {
137 for (unsigned int i = 0; i < active_windows_.size(); ++i) {
138 active_windows_[i]->RemoveObserver(this);
139 }
140 }
141
RemoveActiveWindow(aura::Window * window)142 void DefaultActivationClient::RemoveActiveWindow(aura::Window* window) {
143 for (unsigned int i = 0; i < active_windows_.size(); ++i) {
144 if (active_windows_[i] == window) {
145 active_windows_.erase(active_windows_.begin() + i);
146 window->RemoveObserver(this);
147 return;
148 }
149 }
150 }
151
152 } // namespace wm
153