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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/aura_shell/activation_controller.h"
#include "base/auto_reset.h"
#include "ui/aura/client/activation_delegate.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura_shell/shell.h"
#include "ui/aura_shell/shell_window_ids.h"
#include "ui/aura_shell/window_util.h"
namespace aura_shell {
namespace internal {
namespace {
aura::Window* GetContainer(int id) {
return Shell::GetInstance()->GetContainer(id);
}
// Returns true if children of |window| can be activated.
bool SupportsChildActivation(aura::Window* window) {
return window->id() == kShellWindowId_DefaultContainer ||
window->id() == kShellWindowId_AlwaysOnTopContainer ||
window->id() == kShellWindowId_ModalContainer ||
window->id() == kShellWindowId_LockScreenContainer ||
window->id() == kShellWindowId_LockModalContainer;
}
// Returns true if |window| can be activated or deactivated.
// A window manager typically defines some notion of "top level window" that
// supports activation/deactivation.
bool CanActivateWindow(aura::Window* window) {
return window &&
window->IsVisible() &&
(!aura::client::GetActivationDelegate(window) ||
aura::client::GetActivationDelegate(window)->ShouldActivate(NULL)) &&
SupportsChildActivation(window->parent());
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
// ActivationController, public:
ActivationController::ActivationController()
: updating_activation_(false),
default_container_for_test_(NULL) {
aura::client::SetActivationClient(this);
aura::RootWindow::GetInstance()->AddRootWindowObserver(this);
}
ActivationController::~ActivationController() {
aura::RootWindow::GetInstance()->RemoveRootWindowObserver(this);
}
// static
aura::Window* ActivationController::GetActivatableWindow(aura::Window* window) {
aura::Window* parent = window->parent();
aura::Window* child = window;
while (parent) {
if (SupportsChildActivation(parent))
return child;
// If |child| isn't activatable, but has transient parent, trace
// that path instead.
if (child->transient_parent())
return GetActivatableWindow(child->transient_parent());
parent = parent->parent();
child = child->parent();
}
return NULL;
}
////////////////////////////////////////////////////////////////////////////////
// ActivationController, aura::client::ActivationClient implementation:
void ActivationController::ActivateWindow(aura::Window* window) {
// Prevent recursion when called from focus.
if (updating_activation_)
return;
AutoReset<bool> in_activate_window(&updating_activation_, true);
if (!window)
return;
// Nothing may actually have changed.
aura::Window* old_active = GetActiveWindow();
if (old_active == window)
return;
// The stacking client may impose rules on what window configurations can be
// activated or deactivated.
if (!CanActivateWindow(window))
return;
if (!window->Contains(window->GetFocusManager()->GetFocusedWindow()))
window->GetFocusManager()->SetFocusedWindow(window);
aura::RootWindow::GetInstance()->SetProperty(aura::kRootWindowActiveWindow,
window);
// Invoke OnLostActive after we've changed the active window. That way if the
// delegate queries for active state it doesn't think the window is still
// active.
if (old_active && aura::client::GetActivationDelegate(old_active))
aura::client::GetActivationDelegate(old_active)->OnLostActive();
if (window) {
window->parent()->StackChildAtTop(window);
if (aura::client::GetActivationDelegate(window))
aura::client::GetActivationDelegate(window)->OnActivated();
}
}
void ActivationController::DeactivateWindow(aura::Window* window) {
if (window)
ActivateNextWindow(window);
}
aura::Window* ActivationController::GetActiveWindow() {
return reinterpret_cast<aura::Window*>(
aura::RootWindow::GetInstance()->GetProperty(
aura::kRootWindowActiveWindow));
}
bool ActivationController::CanFocusWindow(aura::Window* window) const {
return CanActivateWindow(GetActivatableWindow(window));
}
////////////////////////////////////////////////////////////////////////////////
// ActivationController, aura::WindowObserver implementation:
void ActivationController::OnWindowVisibilityChanged(aura::Window* window,
bool visible) {
if (!visible)
ActivateNextWindow(window);
}
void ActivationController::OnWindowDestroyed(aura::Window* window) {
if (IsActiveWindow(window)) {
// Clear the property before activating something else, since
// ActivateWindow() will attempt to notify the window stored in this value
// otherwise.
aura::RootWindow::GetInstance()->SetProperty(aura::kRootWindowActiveWindow,
NULL);
ActivateWindow(GetTopmostWindowToActivate(window));
}
window->RemoveObserver(this);
}
////////////////////////////////////////////////////////////////////////////////
// ActivationController, aura::RootWindowObserver implementation:
void ActivationController::OnWindowInitialized(aura::Window* window) {
window->AddObserver(this);
}
void ActivationController::OnWindowFocused(aura::Window* window) {
ActivateWindow(GetActivatableWindow(window));
}
////////////////////////////////////////////////////////////////////////////////
// ActivationController, private:
void ActivationController::ActivateNextWindow(aura::Window* window) {
if (IsActiveWindow(window))
ActivateWindow(GetTopmostWindowToActivate(window));
}
aura::Window* ActivationController::GetTopmostWindowToActivate(
aura::Window* ignore) const {
const aura::Window* container =
default_container_for_test_ ? default_container_for_test_ :
GetContainer(kShellWindowId_DefaultContainer);
for (aura::Window::Windows::const_reverse_iterator i =
container->children().rbegin();
i != container->children().rend();
++i) {
if (*i != ignore && CanActivateWindow(*i))
return *i;
}
return NULL;
}
} // namespace internal
} // namespace aura_shell
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