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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/stacking_controller.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/aura_shell/always_on_top_controller.h"
#include "ui/aura_shell/shell.h"
#include "ui/aura_shell/shell_window_ids.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_LockModalContainer;
}
bool IsWindowModal(aura::Window* window) {
return window->transient_parent() && window->GetIntProperty(aura::kModalKey);
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
// StackingController, public:
StackingController::StackingController() {
aura::RootWindow::GetInstance()->SetStackingClient(this);
}
StackingController::~StackingController() {
}
void StackingController::Init() {
always_on_top_controller_.reset(new internal::AlwaysOnTopController);
always_on_top_controller_->SetContainers(
GetContainer(internal::kShellWindowId_DefaultContainer),
GetContainer(internal::kShellWindowId_AlwaysOnTopContainer));
}
// static
aura::Window* StackingController::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;
}
////////////////////////////////////////////////////////////////////////////////
// StackingController, aura::StackingClient implementation:
void StackingController::AddChildToDefaultParent(aura::Window* window) {
aura::Window* parent = NULL;
switch (window->type()) {
case aura::WINDOW_TYPE_NORMAL:
case aura::WINDOW_TYPE_POPUP:
if (IsWindowModal(window)) {
parent = GetModalContainer(window);
break;
}
parent = always_on_top_controller_->GetContainer(window);
break;
case aura::WINDOW_TYPE_MENU:
case aura::WINDOW_TYPE_TOOLTIP:
parent = GetContainer(internal::kShellWindowId_MenusAndTooltipsContainer);
break;
default:
NOTREACHED() << "Window " << window->id()
<< " has unhandled type " << window->type();
break;
}
parent->AddChild(window);
}
bool StackingController::CanActivateWindow(aura::Window* window) const {
return window && SupportsChildActivation(window->parent());
}
aura::Window* StackingController::GetTopmostWindowToActivate(
aura::Window* ignore) const {
const aura::Window* container = GetContainer(kShellWindowId_DefaultContainer);
for (aura::Window::Windows::const_reverse_iterator i =
container->children().rbegin();
i != container->children().rend();
++i) {
if (*i != ignore && (*i)->CanActivate())
return *i;
}
return NULL;
}
////////////////////////////////////////////////////////////////////////////////
// StackingController, private:
aura::Window* StackingController::GetModalContainer(
aura::Window* window) const {
if (!IsWindowModal(window))
return NULL;
// If screen lock is not active, all modal windows are placed into the
// normal modal container.
aura::Window* lock_container =
GetContainer(internal::kShellWindowId_LockScreenContainer);
if (!lock_container->children().size())
return GetContainer(internal::kShellWindowId_ModalContainer);
// Otherwise those that originate from LockScreen container and above are
// placed in the screen lock modal container.
int lock_container_id = lock_container->id();
int window_container_id = window->transient_parent()->parent()->id();
aura::Window* container = NULL;
if (window_container_id < lock_container_id)
container = GetContainer(internal::kShellWindowId_ModalContainer);
else
container = GetContainer(internal::kShellWindowId_LockModalContainer);
return container;
}
} // namespace internal
} // namespace aura_shell
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