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      1 // Copyright (c) 2012 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 "ash/wm/system_modal_container_layout_manager.h"
      6 
      7 #include "ash/session_state_delegate.h"
      8 #include "ash/shell.h"
      9 #include "ash/shell_window_ids.h"
     10 #include "ash/wm/system_modal_container_event_filter.h"
     11 #include "ash/wm/window_animations.h"
     12 #include "ash/wm/window_util.h"
     13 #include "base/bind.h"
     14 #include "ui/aura/client/aura_constants.h"
     15 #include "ui/aura/client/capture_client.h"
     16 #include "ui/aura/root_window.h"
     17 #include "ui/aura/window.h"
     18 #include "ui/base/ui_base_switches_util.h"
     19 #include "ui/compositor/layer.h"
     20 #include "ui/compositor/layer_animator.h"
     21 #include "ui/compositor/scoped_layer_animation_settings.h"
     22 #include "ui/events/event.h"
     23 #include "ui/gfx/screen.h"
     24 #include "ui/views/background.h"
     25 #include "ui/views/corewm/compound_event_filter.h"
     26 #include "ui/views/view.h"
     27 #include "ui/views/widget/widget.h"
     28 
     29 namespace ash {
     30 namespace internal {
     31 
     32 ////////////////////////////////////////////////////////////////////////////////
     33 // SystemModalContainerLayoutManager, public:
     34 
     35 SystemModalContainerLayoutManager::SystemModalContainerLayoutManager(
     36     aura::Window* container)
     37     : container_(container),
     38       modal_background_(NULL) {
     39 }
     40 
     41 SystemModalContainerLayoutManager::~SystemModalContainerLayoutManager() {
     42 }
     43 
     44 ////////////////////////////////////////////////////////////////////////////////
     45 // SystemModalContainerLayoutManager, aura::LayoutManager implementation:
     46 
     47 void SystemModalContainerLayoutManager::OnWindowResized() {
     48   if (modal_background_) {
     49     // Note: we have to set the entire bounds with the screen offset.
     50     modal_background_->SetBounds(
     51         Shell::GetScreen()->GetDisplayNearestWindow(container_).bounds());
     52   }
     53   if (!modal_windows_.empty()) {
     54     aura::Window::Windows::iterator it = modal_windows_.begin();
     55     for (it = modal_windows_.begin(); it != modal_windows_.end(); ++it) {
     56       gfx::Rect bounds = (*it)->bounds();
     57       bounds.AdjustToFit(container_->bounds());
     58       (*it)->SetBounds(bounds);
     59     }
     60   }
     61 }
     62 
     63 void SystemModalContainerLayoutManager::OnWindowAddedToLayout(
     64     aura::Window* child) {
     65   DCHECK((modal_background_ && child == modal_background_->GetNativeView()) ||
     66          child->type() == aura::client::WINDOW_TYPE_NORMAL ||
     67          child->type() == aura::client::WINDOW_TYPE_POPUP);
     68   DCHECK(
     69       container_->id() != internal::kShellWindowId_LockSystemModalContainer ||
     70       Shell::GetInstance()->session_state_delegate()->IsUserSessionBlocked());
     71 
     72   child->AddObserver(this);
     73   if (child->GetProperty(aura::client::kModalKey) != ui::MODAL_TYPE_NONE)
     74     AddModalWindow(child);
     75 }
     76 
     77 void SystemModalContainerLayoutManager::OnWillRemoveWindowFromLayout(
     78     aura::Window* child) {
     79   child->RemoveObserver(this);
     80   if (child->GetProperty(aura::client::kModalKey) != ui::MODAL_TYPE_NONE)
     81     RemoveModalWindow(child);
     82 }
     83 
     84 void SystemModalContainerLayoutManager::OnWindowRemovedFromLayout(
     85     aura::Window* child) {
     86 }
     87 
     88 void SystemModalContainerLayoutManager::OnChildWindowVisibilityChanged(
     89     aura::Window* child,
     90     bool visible) {
     91 }
     92 
     93 void SystemModalContainerLayoutManager::SetChildBounds(
     94     aura::Window* child,
     95     const gfx::Rect& requested_bounds) {
     96   SetChildBoundsDirect(child, requested_bounds);
     97 }
     98 
     99 ////////////////////////////////////////////////////////////////////////////////
    100 // SystemModalContainerLayoutManager, aura::WindowObserver implementation:
    101 
    102 void SystemModalContainerLayoutManager::OnWindowPropertyChanged(
    103     aura::Window* window,
    104     const void* key,
    105     intptr_t old) {
    106   if (key != aura::client::kModalKey)
    107     return;
    108 
    109   if (window->GetProperty(aura::client::kModalKey) != ui::MODAL_TYPE_NONE) {
    110     AddModalWindow(window);
    111   } else if (static_cast<ui::ModalType>(old) != ui::MODAL_TYPE_NONE) {
    112     RemoveModalWindow(window);
    113     Shell::GetInstance()->OnModalWindowRemoved(window);
    114   }
    115 }
    116 
    117 void SystemModalContainerLayoutManager::OnWindowDestroying(
    118     aura::Window* window) {
    119   if (modal_background_ && modal_background_->GetNativeView() == window)
    120     modal_background_ = NULL;
    121 }
    122 
    123 bool SystemModalContainerLayoutManager::CanWindowReceiveEvents(
    124     aura::Window* window) {
    125   // We could get when we're at lock screen and there is modal window at
    126   // system modal window layer which added event filter.
    127   // Now this lock modal windows layer layout manager should not block events
    128   // for windows at lock layer.
    129   // See SystemModalContainerLayoutManagerTest.EventFocusContainers and
    130   // http://crbug.com/157469
    131   if (modal_windows_.empty())
    132     return true;
    133   // This container can not handle events if the screen is locked and it is not
    134   // above the lock screen layer (crbug.com/110920).
    135   if (Shell::GetInstance()->session_state_delegate()->IsUserSessionBlocked() &&
    136       container_->id() < ash::internal::kShellWindowId_LockScreenContainer)
    137     return true;
    138   return wm::GetActivatableWindow(window) == modal_window();
    139 }
    140 
    141 bool SystemModalContainerLayoutManager::ActivateNextModalWindow() {
    142   if (modal_windows_.empty())
    143     return false;
    144   wm::ActivateWindow(modal_window());
    145   return true;
    146 }
    147 
    148 void SystemModalContainerLayoutManager::CreateModalBackground() {
    149   if (!modal_background_) {
    150     modal_background_ = new views::Widget;
    151     views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL);
    152     params.parent = container_;
    153     params.bounds = Shell::GetScreen()->GetDisplayNearestWindow(
    154         container_).bounds();
    155     modal_background_->Init(params);
    156     modal_background_->GetNativeView()->SetName(
    157         "SystemModalContainerLayoutManager.ModalBackground");
    158     views::View* contents_view = new views::View();
    159     // TODO(jamescook): This could be SK_ColorWHITE for the new dialog style.
    160     contents_view->set_background(
    161         views::Background::CreateSolidBackground(SK_ColorBLACK));
    162     modal_background_->SetContentsView(contents_view);
    163     modal_background_->GetNativeView()->layer()->SetOpacity(0.0f);
    164   }
    165 
    166   ui::ScopedLayerAnimationSettings settings(
    167       modal_background_->GetNativeView()->layer()->GetAnimator());
    168   modal_background_->Show();
    169   modal_background_->GetNativeView()->layer()->SetOpacity(0.5f);
    170   container_->StackChildAtTop(modal_background_->GetNativeView());
    171 }
    172 
    173 void SystemModalContainerLayoutManager::DestroyModalBackground() {
    174   // modal_background_ can be NULL when a root window is shutting down
    175   // and OnWindowDestroying is called first.
    176   if (modal_background_) {
    177     ui::ScopedLayerAnimationSettings settings(
    178         modal_background_->GetNativeView()->layer()->GetAnimator());
    179     modal_background_->Close();
    180     settings.AddObserver(views::corewm::CreateHidingWindowAnimationObserver(
    181         modal_background_->GetNativeView()));
    182     modal_background_->GetNativeView()->layer()->SetOpacity(0.0f);
    183     modal_background_ = NULL;
    184   }
    185 }
    186 
    187 // static
    188 bool SystemModalContainerLayoutManager::IsModalBackground(
    189     aura::Window* window) {
    190   int id = window->parent()->id();
    191   if (id != internal::kShellWindowId_SystemModalContainer &&
    192       id != internal::kShellWindowId_LockSystemModalContainer)
    193     return false;
    194   SystemModalContainerLayoutManager* layout_manager =
    195       static_cast<SystemModalContainerLayoutManager*>(
    196           window->parent()->layout_manager());
    197   return layout_manager->modal_background_ &&
    198       layout_manager->modal_background_->GetNativeWindow() == window;
    199 }
    200 
    201 ////////////////////////////////////////////////////////////////////////////////
    202 // SystemModalContainerLayoutManager, private:
    203 
    204 void SystemModalContainerLayoutManager::AddModalWindow(aura::Window* window) {
    205   if (modal_windows_.empty()) {
    206     aura::Window* capture_window = aura::client::GetCaptureWindow(container_);
    207     if (capture_window)
    208       capture_window->ReleaseCapture();
    209   }
    210   modal_windows_.push_back(window);
    211   Shell::GetInstance()->CreateModalBackground(window);
    212   window->parent()->StackChildAtTop(window);
    213 }
    214 
    215 void SystemModalContainerLayoutManager::RemoveModalWindow(
    216     aura::Window* window) {
    217   aura::Window::Windows::iterator it =
    218       std::find(modal_windows_.begin(), modal_windows_.end(), window);
    219   if (it != modal_windows_.end())
    220     modal_windows_.erase(it);
    221 }
    222 
    223 }  // namespace internal
    224 }  // namespace ash
    225