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// 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.
#include "ui/wm/core/default_activation_client.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "ui/aura/window.h"
#include "ui/wm/public/activation_change_observer.h"
#include "ui/wm/public/activation_delegate.h"
namespace wm {
// Takes care of observing root window destruction & destroying the client.
class DefaultActivationClient::Deleter : public aura::WindowObserver {
public:
Deleter(DefaultActivationClient* client, aura::Window* root_window)
: client_(client),
root_window_(root_window) {
root_window_->AddObserver(this);
}
Deleter(const Deleter&) = delete;
Deleter& operator=(const Deleter&) = delete;
private:
~Deleter() override {}
// Overridden from WindowObserver:
void OnWindowDestroyed(aura::Window* window) override {
DCHECK_EQ(window, root_window_);
root_window_->RemoveObserver(this);
delete client_;
delete this;
}
raw_ptr<DefaultActivationClient, DanglingUntriaged> client_;
raw_ptr<aura::Window> root_window_;
};
////////////////////////////////////////////////////////////////////////////////
// DefaultActivationClient, public:
DefaultActivationClient::DefaultActivationClient(aura::Window* root_window)
: last_active_(nullptr) {
SetActivationClient(root_window, this);
new Deleter(this, root_window);
}
////////////////////////////////////////////////////////////////////////////////
// DefaultActivationClient, ActivationClient implementation:
void DefaultActivationClient::AddObserver(ActivationChangeObserver* observer) {
observers_.AddObserver(observer);
}
void DefaultActivationClient::RemoveObserver(
ActivationChangeObserver* observer) {
observers_.RemoveObserver(observer);
}
void DefaultActivationClient::ActivateWindow(aura::Window* window) {
ActivateWindowImpl(
ActivationChangeObserver::ActivationReason::ACTIVATION_CLIENT, window);
}
void DefaultActivationClient::ActivateWindowImpl(
ActivationChangeObserver::ActivationReason reason,
aura::Window* window) {
aura::Window* last_active = ActivationClient::GetActiveWindow();
if (last_active == window)
return;
observers_.Notify(&ActivationChangeObserver::OnWindowActivating, reason,
window, last_active);
last_active_ = last_active;
if (window) {
RemoveActiveWindow(window);
active_windows_.push_back(window);
window->parent()->StackChildAtTop(window);
window->AddObserver(this);
} else {
ClearActiveWindows();
}
observers_.Notify(&ActivationChangeObserver::OnWindowActivated, reason,
window, last_active);
if (window) {
ActivationChangeObserver* observer =
GetActivationChangeObserver(last_active);
if (observer) {
observer->OnWindowActivated(reason, window, last_active);
}
observer = GetActivationChangeObserver(window);
if (observer) {
observer->OnWindowActivated(reason, window, last_active);
}
}
}
void DefaultActivationClient::DeactivateWindow(aura::Window* window) {
ActivationChangeObserver* observer = GetActivationChangeObserver(window);
if (observer) {
observer->OnWindowActivated(
ActivationChangeObserver::ActivationReason::ACTIVATION_CLIENT, nullptr,
window);
}
if (last_active_)
ActivateWindow(last_active_);
}
const aura::Window* DefaultActivationClient::GetActiveWindow() const {
if (active_windows_.empty())
return nullptr;
return active_windows_.back();
}
aura::Window* DefaultActivationClient::GetActivatableWindow(
aura::Window* window) const {
return nullptr;
}
const aura::Window* DefaultActivationClient::GetToplevelWindow(
const aura::Window* window) const {
return nullptr;
}
bool DefaultActivationClient::CanActivateWindow(
const aura::Window* window) const {
return true;
}
////////////////////////////////////////////////////////////////////////////////
// DefaultActivationClient, aura::WindowObserver implementation:
void DefaultActivationClient::OnWindowDestroyed(aura::Window* window) {
if (window == last_active_)
last_active_ = nullptr;
if (window == GetActiveWindow()) {
active_windows_.pop_back();
aura::Window* next_active = ActivationClient::GetActiveWindow();
if (next_active && GetActivationChangeObserver(next_active)) {
GetActivationChangeObserver(next_active)
->OnWindowActivated(ActivationChangeObserver::ActivationReason::
WINDOW_DISPOSITION_CHANGED,
next_active, nullptr);
}
return;
}
RemoveActiveWindow(window);
}
////////////////////////////////////////////////////////////////////////////////
// DefaultActivationClient, private:
DefaultActivationClient::~DefaultActivationClient() {
ClearActiveWindows();
}
void DefaultActivationClient::RemoveActiveWindow(aura::Window* window) {
for (unsigned int i = 0; i < active_windows_.size(); ++i) {
if (active_windows_[i] == window) {
active_windows_.erase(active_windows_.begin() + i);
window->RemoveObserver(this);
return;
}
}
}
void DefaultActivationClient::ClearActiveWindows() {
for (aura::Window* window : active_windows_)
window->RemoveObserver(this);
active_windows_.clear();
}
} // namespace wm
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