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// Copyright (c) 2012 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 "ash/wm/shadow_controller.h"
#include <utility>
#include "ash/shell.h"
#include "ash/wm/shadow.h"
#include "ash/wm/shadow_types.h"
#include "ash/wm/window_properties.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "ui/aura/client/activation_client.h"
#include "ui/aura/env.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/compositor/layer.h"
using std::make_pair;
namespace ash {
namespace internal {
namespace {
ShadowType GetShadowTypeFromWindow(aura::Window* window) {
switch (window->type()) {
case aura::client::WINDOW_TYPE_NORMAL:
case aura::client::WINDOW_TYPE_PANEL:
case aura::client::WINDOW_TYPE_MENU:
case aura::client::WINDOW_TYPE_TOOLTIP:
return SHADOW_TYPE_RECTANGULAR;
default:
break;
}
return SHADOW_TYPE_NONE;
}
bool ShouldUseSmallShadowForWindow(aura::Window* window) {
switch (window->type()) {
case aura::client::WINDOW_TYPE_MENU:
case aura::client::WINDOW_TYPE_TOOLTIP:
return true;
default:
break;
}
return false;
}
// Returns the shadow style to be applied to |losing_active| when it is losing
// active to |gaining_active|. |gaining_active| may be of a type that hides when
// inactive, and as such we do not want to render |losing_active| as inactive.
Shadow::Style GetShadowStyleForWindowLosingActive(
aura::Window* losing_active,
aura::Window* gaining_active) {
if (gaining_active && aura::client::GetHideOnDeactivate(gaining_active)) {
aura::Window::Windows::const_iterator it =
std::find(losing_active->transient_children().begin(),
losing_active->transient_children().end(),
gaining_active);
if (it != losing_active->transient_children().end())
return Shadow::STYLE_ACTIVE;
}
return Shadow::STYLE_INACTIVE;
}
} // namespace
ShadowController::ShadowController()
: ALLOW_THIS_IN_INITIALIZER_LIST(observer_manager_(this)) {
aura::Env::GetInstance()->AddObserver(this);
// Watch for window activation changes.
Shell::GetPrimaryRootWindow()->AddObserver(this);
}
ShadowController::~ShadowController() {
Shell::GetPrimaryRootWindow()->RemoveObserver(this);
aura::Env::GetInstance()->RemoveObserver(this);
}
void ShadowController::OnWindowInitialized(aura::Window* window) {
observer_manager_.Add(window);
SetShadowType(window, GetShadowTypeFromWindow(window));
HandlePossibleShadowVisibilityChange(window);
}
void ShadowController::OnWindowPropertyChanged(aura::Window* window,
const void* key,
intptr_t old) {
if (key == kShadowTypeKey) {
HandlePossibleShadowVisibilityChange(window);
return;
}
if (key == aura::client::kRootWindowActiveWindowKey) {
HandleWindowActivationChange(
window->GetProperty(aura::client::kRootWindowActiveWindowKey),
reinterpret_cast<aura::Window*>(old));
return;
}
}
void ShadowController::OnWindowBoundsChanged(aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) {
Shadow* shadow = GetShadowForWindow(window);
if (shadow)
shadow->SetContentBounds(gfx::Rect(new_bounds.size()));
}
void ShadowController::OnWindowDestroyed(aura::Window* window) {
window_shadows_.erase(window);
observer_manager_.Remove(window);
}
bool ShadowController::ShouldShowShadowForWindow(aura::Window* window) const {
const ShadowType type = GetShadowType(window);
switch (type) {
case SHADOW_TYPE_NONE:
return false;
case SHADOW_TYPE_RECTANGULAR:
return true;
default:
NOTREACHED() << "Unknown shadow type " << type;
return false;
}
}
Shadow* ShadowController::GetShadowForWindow(aura::Window* window) {
WindowShadowMap::const_iterator it = window_shadows_.find(window);
return it != window_shadows_.end() ? it->second.get() : NULL;
}
void ShadowController::HandleWindowActivationChange(
aura::Window* gaining_active,
aura::Window* losing_active) {
if (gaining_active) {
Shadow* shadow = GetShadowForWindow(gaining_active);
if (shadow && !ShouldUseSmallShadowForWindow(gaining_active))
shadow->SetStyle(Shadow::STYLE_ACTIVE);
}
if (losing_active) {
Shadow* shadow = GetShadowForWindow(losing_active);
if (shadow && !ShouldUseSmallShadowForWindow(losing_active)) {
shadow->SetStyle(GetShadowStyleForWindowLosingActive(losing_active,
gaining_active));
}
}
}
void ShadowController::HandlePossibleShadowVisibilityChange(
aura::Window* window) {
const bool should_show = ShouldShowShadowForWindow(window);
Shadow* shadow = GetShadowForWindow(window);
if (shadow)
shadow->layer()->SetVisible(should_show);
else if (should_show && !shadow)
CreateShadowForWindow(window);
}
void ShadowController::CreateShadowForWindow(aura::Window* window) {
linked_ptr<Shadow> shadow(new Shadow());
window_shadows_.insert(make_pair(window, shadow));
shadow->Init(ShouldUseSmallShadowForWindow(window) ?
Shadow::STYLE_SMALL : Shadow::STYLE_ACTIVE);
shadow->SetContentBounds(gfx::Rect(window->bounds().size()));
shadow->layer()->SetVisible(ShouldShowShadowForWindow(window));
window->layer()->Add(shadow->layer());
}
} // namespace internal
} // namespace ash
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