athena: Add a minimized state for the home-card.

athena/home/home_card_impl.cc

 // Copyright 2014 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 "athena/home/public/home_card.h"
 
 #include "athena/home/app_list_view_delegate.h"
+#include "athena/home/minimized_home.h"
 #include "athena/home/public/app_model_builder.h"
 #include "athena/input/public/accelerator_manager.h"
 #include "athena/screen/public/screen_manager.h"
+#include "athena/wm/public/window_manager.h"
+#include "athena/wm/public/window_manager_observer.h"
+#include "base/bind.h"
 #include "ui/app_list/search_provider.h"
 #include "ui/app_list/views/app_list_view.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
+#include "ui/views/layout/box_layout.h"
 #include "ui/wm/core/visibility_controller.h"
 #include "ui/wm/core/window_animations.h"
 
 namespace athena {
 namespace {
 
 HomeCard* instance = NULL;
 
+// Makes sure the homecard is center-aligned horizontally and bottom-aligned
+// vertically.
 class HomeCardLayoutManager : public aura::LayoutManager {
  public:
-  explicit HomeCardLayoutManager(aura::Window* container)
-      : container_(container) {}
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+
+    virtual int GetHomeCardHeight() const = 0;
+
+    virtual int GetHorizontalMargin() const = 0;
+
+    // TODO(mukai): Remove this when bubble is no longer used for
+    // VISIBLE_CENTERED or VISIBLE_BOTTOM states.
+    virtual bool HasShadow() const = 0;
+
+    virtual aura::Window* GetNativeWindow() = 0;
+  };
+
+  explicit HomeCardLayoutManager(Delegate* delegate)
+      : delegate_(delegate) {}
   virtual ~HomeCardLayoutManager() {}
 
   void UpdateVirtualKeyboardBounds(const gfx::Rect& bounds) {
     virtual_keyboard_bounds_ = bounds;
     Layout();
   }
 
  private:
   // aura::LayoutManager:
   virtual void OnWindowResized() OVERRIDE { Layout(); }
   virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE { Layout(); }
   virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE {}
   virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE {
     Layout();
   }
   virtual void OnChildWindowVisibilityChanged(aura::Window* child,
                                               bool visible) OVERRIDE {
     Layout();
   }
   virtual void SetChildBounds(aura::Window* child,
                               const gfx::Rect& requested_bounds) OVERRIDE {
     SetChildBoundsDirect(child, gfx::Rect(requested_bounds.size()));
   }
 
   void Layout() {
-    const int kHomeCardHeight = 150;
-    const int kHomeCardHorizontalMargin = 50;
-    // Currently the home card is provided as a bubble and the bounds has to be
-    // increased to cancel the shadow.
-    // TODO(mukai): stops using the bubble and remove this.
-    const int kHomeCardShadowWidth = 30;
-    if (container_->children().size() < 1)
-      return;
-    aura::Window* home_card = container_->children()[0];
-    if (!home_card->IsVisible())
+    int height = delegate_->GetHomeCardHeight();
+    int horiz_margin = delegate_->GetHorizontalMargin();
+    aura::Window* home_card = delegate_->GetNativeWindow();
+    // |home_card| could be detached from the root window (e.g. when it is being
+    // destroyed).
+    if (!home_card || !home_card->GetRootWindow())
       return;
 
     gfx::Rect screen_bounds = home_card->GetRootWindow()->bounds();
     if (!virtual_keyboard_bounds_.IsEmpty())
       screen_bounds.set_height(virtual_keyboard_bounds_.y());
     gfx::Rect card_bounds = screen_bounds;
-    card_bounds.Inset(kHomeCardHorizontalMargin,
-                      screen_bounds.height() - kHomeCardHeight,
-                      kHomeCardHorizontalMargin,
-                      0);
-    card_bounds.Inset(-kHomeCardShadowWidth, -kHomeCardShadowWidth);
+    card_bounds.Inset(horiz_margin, screen_bounds.height() - height,
+                      horiz_margin, 0);
+
+    if (delegate_->HasShadow()) {
+      // Currently the home card is provided as a bubble and the bounds has to
+      // be increased to cancel the shadow.
+      // TODO(mukai): stops using the bubble and remove this.
+      const int kHomeCardShadowWidth = 30;
+      card_bounds.Inset(-kHomeCardShadowWidth, -kHomeCardShadowWidth);
+    }
     SetChildBoundsDirect(home_card, card_bounds);
   }
 
-  aura::Window* container_;
+  Delegate* delegate_;
   gfx::Rect virtual_keyboard_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(HomeCardLayoutManager);
 };
 
-class HomeCardImpl : public HomeCard, public AcceleratorHandler {
+class HomeCardImpl : public HomeCard,
+                     public AcceleratorHandler,
+                     public HomeCardLayoutManager::Delegate,
+                     public MinimizedHomeDragDelegate,
+                     public WindowManagerObserver {
  public:
   explicit HomeCardImpl(AppModelBuilder* model_builder);
   virtual ~HomeCardImpl();
 
   void Init();
 
  private:
   enum Command {
     COMMAND_SHOW_HOME_CARD,
   };
@@ skipping 11 matching lines @@
   virtual bool OnAcceleratorFired(int command_id,
                                   const ui::Accelerator& accelerator) OVERRIDE {
     DCHECK_EQ(COMMAND_SHOW_HOME_CARD, command_id);
     if (state_ == HIDDEN)
       SetState(VISIBLE_CENTERED);
     else
       SetState(HIDDEN);
     return true;
   }
 
+  // HomeCardLayoutManager::Delegate:
+  virtual int GetHomeCardHeight() const OVERRIDE {
+    const int kHomeCardHeight = 150;
+    const int kHomeCardMinimizedHeight = 8;
+    CHECK_NE(HIDDEN, state_);
+    return state_ == VISIBLE_MINIMIZED ? kHomeCardMinimizedHeight :
+                                         kHomeCardHeight;
+  }
+
+  virtual int GetHorizontalMargin() const OVERRIDE {
+    CHECK_NE(HIDDEN, state_);
+    const int kHomeCardHorizontalMargin = 50;
+    return state_ == VISIBLE_MINIMIZED ? 0 : kHomeCardHorizontalMargin;
+  }
+
+  virtual bool HasShadow() const OVERRIDE {
+    CHECK_NE(HIDDEN, state_);
+    return state_ != VISIBLE_MINIMIZED;
+  }
+
+  virtual aura::Window* GetNativeWindow() OVERRIDE {
+    switch (state_) {
+      case HIDDEN:
+        return NULL;
+      case VISIBLE_MINIMIZED:
+        return minimized_widget_ ? minimized_widget_->GetNativeWindow() : NULL;
+      case VISIBLE_CENTERED:
+      case VISIBLE_BOTTOM:
+        return home_card_widget_ ? home_card_widget_->GetNativeWindow() : NULL;
+    }
+    return NULL;
+  }
+
+  // MinimizedHomeDragDelegate:
+  virtual void OnDragUpCompleted() OVERRIDE {
+    WindowManager::GetInstance()->ToggleOverview();
+  }
+
+  // WindowManagerObserver:
+  virtual void OnOverviewModeEnter() OVERRIDE {
+    SetState(VISIBLE_BOTTOM);
+  }
+
+  virtual void OnOverviewModeExit() OVERRIDE {
+    SetState(VISIBLE_MINIMIZED);
+  }
+
   scoped_ptr<AppModelBuilder> model_builder_;
 
   HomeCard::State state_;
 
   views::Widget* home_card_widget_;
+  views::Widget* minimized_widget_;
   AppListViewDelegate* view_delegate_;
   HomeCardLayoutManager* layout_manager_;
 
   // Right now HomeCard allows only one search provider.
   // TODO(mukai): port app-list's SearchController and Mixer.
   scoped_ptr<app_list::SearchProvider> search_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(HomeCardImpl);
 };
 
 HomeCardImpl::HomeCardImpl(AppModelBuilder* model_builder)
     : model_builder_(model_builder),
-      state_(HIDDEN),
+      state_(VISIBLE_MINIMIZED),
       home_card_widget_(NULL),
+      minimized_widget_(NULL),
       layout_manager_(NULL) {
   DCHECK(!instance);
   instance = this;
+  WindowManager::GetInstance()->AddObserver(this);
 }
 
 HomeCardImpl::~HomeCardImpl() {
   DCHECK(instance);
+  WindowManager::GetInstance()->RemoveObserver(this);
   home_card_widget_->CloseNow();
+  minimized_widget_->CloseNow();
   view_delegate_ = NULL;
   instance = NULL;
 }
 
 void HomeCardImpl::SetState(HomeCard::State state) {
-  if (state == HIDDEN)
-    home_card_widget_->Hide();
-  else
-    home_card_widget_->Show();
+  // Update |state_| before changing the visibility of the widgets, so that
+  // LayoutManager callbacks get the correct state.
   state_ = state;
+  switch (state_) {
+    case VISIBLE_MINIMIZED:
+      home_card_widget_->Hide();
+      minimized_widget_->Show();
+      break;
+    case HIDDEN:
+      home_card_widget_->Hide();
+      minimized_widget_->Hide();
+      break;
+    case VISIBLE_BOTTOM:
+    case VISIBLE_CENTERED:
+      home_card_widget_->Show();
+      minimized_widget_->Hide();
+      break;
+  }
 }
 
 void HomeCardImpl::RegisterSearchProvider(
     app_list::SearchProvider* search_provider) {
   DCHECK(!search_provider_);
   search_provider_.reset(search_provider);
   view_delegate_->RegisterSearchProvider(search_provider_.get());
 }
 
 void HomeCardImpl::UpdateVirtualKeyboardBounds(
     const gfx::Rect& bounds) {
+  if (state_ == VISIBLE_MINIMIZED) {
+    if (bounds.IsEmpty())
+      minimized_widget_->Show();
+    else
+      minimized_widget_->Hide();
+  }
   layout_manager_->UpdateVirtualKeyboardBounds(bounds);
 }
 
 void HomeCardImpl::Init() {
   InstallAccelerators();
 
   aura::Window* container =
       ScreenManager::Get()->CreateContainer("HomeCardContainer");
-  layout_manager_ = new HomeCardLayoutManager(container);
+  layout_manager_ = new HomeCardLayoutManager(this);
   container->SetLayoutManager(layout_manager_);
   wm::SetChildWindowVisibilityChangesAnimated(container);
 
   view_delegate_ = new AppListViewDelegate(model_builder_.get());
   if (search_provider_)
     view_delegate_->RegisterSearchProvider(search_provider_.get());
   app_list::AppListView* view = new app_list::AppListView(view_delegate_);
   view->InitAsBubbleAtFixedLocation(
       container,
       0 /* initial_apps_page */,
       gfx::Point(),
       views::BubbleBorder::FLOAT,
       true /* border_accepts_events */);
   home_card_widget_ = view->GetWidget();
-  // TODO: the initial value might not be visible.
-  state_ = VISIBLE_CENTERED;
-  view->ShowWhenReady();
+
+  // Start off in the minimized state.
+  minimized_widget_ = CreateMinimizedHome(container, this);
+  SetState(VISIBLE_MINIMIZED);
 }
 
 void HomeCardImpl::InstallAccelerators() {
   const AcceleratorData accelerator_data[] = {
       {TRIGGER_ON_PRESS, ui::VKEY_L, ui::EF_CONTROL_DOWN,
        COMMAND_SHOW_HOME_CARD, AF_NONE},
   };
   AcceleratorManager::Get()->RegisterAccelerators(
       accelerator_data, arraysize(accelerator_data), this);
 }
@@ skipping 14 matching lines @@
   instance = NULL;
 }
 
 // static
 HomeCard* HomeCard::Get() {
   DCHECK(instance);
   return instance;
 }
 
 }  // namespace athena