Beginnings of Window Modality support.

ui/aura_shell/modal_container_layout_manager.cc

+// 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/modal_container_layout_manager.h"
+
+#include "base/bind.h"
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/desktop.h"
+#include "ui/aura/event.h"
+#include "ui/aura/window.h"
+#include "ui/aura_shell/modality_event_filter.h"
+#include "ui/aura_shell/shell.h"
+#include "ui/aura_shell/stacking_controller.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/compositor/layer.h"
+#include "ui/gfx/compositor/layer_animator.h"
+#include "views/view.h"
+#include "views/widget/widget.h"
+
+namespace aura_shell {
+namespace internal {
+
+namespace {
+
+class ScreenView : public views::View {
+ public:
+  ScreenView() {}
+  virtual ~ScreenView() {}
+
+  // Overridden from views::View:
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
+    canvas->FillRect(SK_ColorBLACK, GetLocalBounds());
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ScreenView);
+};
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+// ModalContainerLayoutManager, public:
+
+ModalContainerLayoutManager::ModalContainerLayoutManager(
+    aura::Window* container)
+    : container_(container),
+      modal_screen_(NULL),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          modality_filter_(new ModalityEventFilter(container, this))) {
+}
+
+ModalContainerLayoutManager::~ModalContainerLayoutManager() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ModalContainerLayoutManager, aura::LayoutManager implementation:
+
+void ModalContainerLayoutManager::OnWindowResized() {
+  if (modal_screen_) {
+    modal_screen_->SetBounds(gfx::Rect(0, 0, container_->bounds().width(),
+                                       container_->bounds().height()));
+  }
+}
+
+void ModalContainerLayoutManager::OnWindowAddedToLayout(
+    aura::Window* child) {
+  child->AddObserver(this);
+  if (child->GetIntProperty(aura::kModalKey))
+    AddModalWindow(child);
+}
+
+void ModalContainerLayoutManager::OnWillRemoveWindowFromLayout(
+    aura::Window* child) {
+  child->RemoveObserver(this);
+  if (child->GetIntProperty(aura::kModalKey))
+    RemoveModalWindow(child);
+}
+
+void ModalContainerLayoutManager::OnChildWindowVisibilityChanged(
+    aura::Window* child,
+    bool visible) {
+}
+
+void ModalContainerLayoutManager::SetChildBounds(
+    aura::Window* child,
+    const gfx::Rect& requested_bounds) {
+  SetChildBoundsDirect(child, requested_bounds);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ModalContainerLayoutManager, aura::WindowObserver implementation:
+
+void ModalContainerLayoutManager::OnPropertyChanged(aura::Window* window,
+                                                    const char* key,
+                                                    void* old) {
+  if (key != aura::kModalKey)
+    return;
+
+  if (window->GetIntProperty(aura::kModalKey)) {
+    AddModalWindow(window);
+  } else if (reinterpret_cast<bool>(old)) {
+    RemoveModalWindow(window);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ModalContainerLayoutManager, ui::LayerAnimationObserver implementation:
+
+void ModalContainerLayoutManager::OnLayerAnimationEnded(
+    const ui::LayerAnimationSequence* sequence) {
+  if (modal_screen_ && !modal_screen_->GetNativeView()->layer()->ShouldDraw())
+    DestroyModalScreen();
+}
+
+void ModalContainerLayoutManager::OnLayerAnimationAborted(
+    const ui::LayerAnimationSequence* sequence) {
+}
+
+void ModalContainerLayoutManager::OnLayerAnimationScheduled(
+    const ui::LayerAnimationSequence* sequence) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ModalContainerLayoutManager, ModalityEventFilter::Delegate implementation:
+
+bool ModalContainerLayoutManager::CanWindowReceiveEvents(
+    aura::Window* window) {
+  return StackingController::GetActivatableWindow(window) == modal_window();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ModalContainerLayoutManager, private:
+
+void ModalContainerLayoutManager::AddModalWindow(aura::Window* window) {
+  modal_windows_.push_back(window);
+  CreateModalScreen();
+  container_->MoveChildToFront(window);
+  window->Activate();
+}
+
+void ModalContainerLayoutManager::RemoveModalWindow(aura::Window* window) {
+  aura::Window::Windows::iterator it =
+      std::find(modal_windows_.begin(), modal_windows_.end(), window);
+  if (it != modal_windows_.end())
+    modal_windows_.erase(it);
+
+  if (modal_windows_.empty())
+    HideModalScreen();
+  else
+    modal_window()->Activate();
+}
+
+void ModalContainerLayoutManager::CreateModalScreen() {
+  if (modal_screen_)
+    return;
+  modal_screen_ = new views::Widget;
+  views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL);
+  params.parent = container_;
+  params.bounds = gfx::Rect(0, 0, container_->bounds().width(),
+                            container_->bounds().height());
+  modal_screen_->Init(params);
+  modal_screen_->GetNativeView()->set_name(
+      "ModalContainerLayoutManager.ModalScreen");
+  modal_screen_->SetContentsView(new ScreenView);
+  modal_screen_->GetNativeView()->layer()->SetOpacity(0.0f);
+  modal_screen_->GetNativeView()->layer()->GetAnimator()->AddObserver(this);
+
+  Shell::GetInstance()->AddDesktopEventFilter(modality_filter_.get());
+
+  ui::LayerAnimator::ScopedSettings settings(
+      modal_screen_->GetNativeView()->layer()->GetAnimator());
+  modal_screen_->Show();
+  modal_screen_->GetNativeView()->layer()->SetOpacity(0.5f);
+  container_->MoveChildToFront(modal_screen_->GetNativeView());
+}
+
+void ModalContainerLayoutManager::DestroyModalScreen() {
+  modal_screen_->GetNativeView()->layer()->GetAnimator()->RemoveObserver(this);
+  modal_screen_->Close();
+  modal_screen_ = NULL;
+}
+
+void ModalContainerLayoutManager::HideModalScreen() {
+  Shell::GetInstance()->RemoveDesktopEventFilter(modality_filter_.get());
+  ui::LayerAnimator::ScopedSettings settings(
+      modal_screen_->GetNativeView()->layer()->GetAnimator());
+  modal_screen_->GetNativeView()->layer()->SetOpacity(0.0f);
+}
+
+}  // namespace internal
+}  // namespace aura_shell