Refactor: Shelf Widget

ash/shelf/shelf_widget.cc

+// 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/shelf/shelf_widget.h"
+
+#include "ash/focus_cycler.h"
+#include "ash/launcher/launcher_delegate.h"
+#include "ash/launcher/launcher_model.h"
+#include "ash/launcher/launcher_navigator.h"
+#include "ash/launcher/launcher_view.h"
+#include "ash/root_window_controller.h"
+#include "ash/shelf/shelf_layout_manager.h"
+#include "ash/shelf/shelf_widget.h"
+#include "ash/shell.h"
+#include "ash/shell_delegate.h"
+#include "ash/shell_window_ids.h"
+#include "ash/wm/property_util.h"
+#include "ash/wm/status_area_layout_manager.h"
+#include "ash/wm/window_properties.h"
+#include "ash/wm/workspace_controller.h"
+#include "grit/ash_resources.h"
+#include "ui/aura/client/activation_client.h"
+#include "ui/aura/root_window.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_observer.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/compositor/layer.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/image/image.h"
+#include "ui/gfx/image/image_skia_operations.h"
+#include "ui/gfx/skbitmap_operations.h"
+#include "ui/views/accessible_pane_view.h"
+#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_delegate.h"
+
+namespace {
+// Size of black border at bottom (or side) of launcher.
+const int kNumBlackPixels = 3;
+// Alpha to paint dimming image with.
+const int kDimAlpha = 96;
+}
+
+namespace ash {
+
+// The contents view of the Shelf. This view contains LauncherView and
+// sizes it to the width of the shelf minus the size of the status area.
+class ShelfWidget::DelegateView : public views::WidgetDelegate,
+                                  public views::AccessiblePaneView,
+                                  public internal::BackgroundAnimatorDelegate {
+ public:
+  explicit DelegateView(ShelfWidget* shelf);
+  virtual ~DelegateView();
+
+  void set_focus_cycler(internal::FocusCycler* focus_cycler) {
+    focus_cycler_ = focus_cycler;
+  }
+  internal::FocusCycler* focus_cycler() {
+    return focus_cycler_;
+  }
+
+  // Set if the shelf area is dimmed (eg when a window is maximized).
+  void SetDimmed(bool dimmed) {
+    if (dimmed_ != dimmed) {
+      dimmed_ = dimmed;
+      SchedulePaint();
+    }
+  }
+  bool GetDimmed() const { return dimmed_; }
+
+  // views::View overrides:
+  void OnPaintBackground(gfx::Canvas* canvas) OVERRIDE;
+
+  // views::WidgetDelegateView overrides:
+  views::Widget* GetWidget() OVERRIDE {
+    return View::GetWidget();
+  }
+  const views::Widget* GetWidget() const OVERRIDE {
+    return View::GetWidget();
+  }
+
+  bool CanActivate() const OVERRIDE;
+  void Layout() OVERRIDE;
+
+  // BackgroundAnimatorDelegate overrides:
+  void UpdateBackground(int alpha) OVERRIDE;
+
+ private:
+  ShelfWidget* shelf_;
+  internal::FocusCycler* focus_cycler_;
+  int alpha_;
+  bool dimmed_;
+
+  DISALLOW_COPY_AND_ASSIGN(DelegateView);
+};
+
+ShelfWidget::DelegateView::DelegateView(ShelfWidget* shelf)
+    : shelf_(shelf),
+      focus_cycler_(NULL),
+      alpha_(0),
+      dimmed_(false) {
+}
+
+ShelfWidget::DelegateView::~DelegateView() {
+}
+
+void ShelfWidget::DelegateView::OnPaintBackground(gfx::Canvas* canvas) {
+  ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+  gfx::ImageSkia launcher_background =
+      *rb.GetImageSkiaNamed(IDR_AURA_LAUNCHER_BACKGROUND);
+  if (SHELF_ALIGNMENT_BOTTOM != shelf_->GetAlignment())
+    launcher_background = gfx::ImageSkiaOperations::CreateRotatedImage(
+        launcher_background,
+        shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
+            SkBitmapOperations::ROTATION_90_CW,
+            SkBitmapOperations::ROTATION_90_CW,
+            SkBitmapOperations::ROTATION_270_CW,
+            SkBitmapOperations::ROTATION_180_CW));
+
+  gfx::Rect black_rect =
+      shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
+          gfx::Rect(0, height() - kNumBlackPixels, width(), kNumBlackPixels),
+          gfx::Rect(0, 0, kNumBlackPixels, height()),
+          gfx::Rect(width() - kNumBlackPixels, 0, kNumBlackPixels, height()),
+          gfx::Rect(0, 0, width(), kNumBlackPixels));
+
+  SkPaint paint;
+  paint.setAlpha(alpha_);
+  canvas->DrawImageInt(
+      launcher_background,
+      0, 0, launcher_background.width(), launcher_background.height(),
+      0, 0, width(), height(),
+      false,
+      paint);
+  canvas->FillRect(black_rect, SK_ColorBLACK);
+
+  if (dimmed_) {
+    gfx::ImageSkia background_image =
+        *rb.GetImageSkiaNamed(IDR_AURA_LAUNCHER_DIMMING);
+    if (SHELF_ALIGNMENT_BOTTOM != shelf_->GetAlignment())
+      background_image = gfx::ImageSkiaOperations::CreateRotatedImage(
+          background_image,
+          shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
+              SkBitmapOperations::ROTATION_90_CW,
+              SkBitmapOperations::ROTATION_90_CW,
+              SkBitmapOperations::ROTATION_270_CW,
+              SkBitmapOperations::ROTATION_180_CW));
+
+    SkPaint paint;
+    paint.setAlpha(kDimAlpha);
+    canvas->DrawImageInt(
+        background_image,
+        0, 0, background_image.width(), background_image.height(),
+        0, 0, width(), height(),
+        false,
+        paint);
+  }
+}
+
+bool ShelfWidget::DelegateView::CanActivate() const {
+  // Allow to activate as fallback.
+  if (shelf_->activating_as_fallback_)
+    return true;
+  // Allow to activate from the focus cycler.
+  if (focus_cycler_ && focus_cycler_->widget_activating() == GetWidget())
+    return true;
+  // Disallow activating in other cases, especially when using mouse.
+  return false;
+}
+
+void ShelfWidget::DelegateView::Layout() {
+  for(int i = 0; i < this->child_count(); ++i) {

[James Cook, 2013/03/06 02:39:03]

nit: Don't need "this", just child_count()

+    if (shelf_->shelf_layout_manager()->IsHorizontalAlignment()) {
+      child_at(i)->SetBounds(child_at(i)->x(), child_at(i)->y(),
+                             child_at(i)->width(), height());
+    } else {
+      child_at(i)->SetBounds(child_at(i)->x(), child_at(i)->y(),
+                             width(), child_at(i)->height());
+    }
+  }
+}
+
+void ShelfWidget::DelegateView::UpdateBackground(int alpha) {
+  alpha_ = alpha;
+  SchedulePaint();
+}
+
+ShelfWidget::ShelfWidget(
+    aura::Window* shelf_container,
+    aura::Window* status_container,
+    internal::WorkspaceController* workspace_controller) :
+    launcher_(NULL),
+    delegate_view_(new DelegateView(this)),
+    background_animator_(delegate_view_, 0, kLauncherBackgroundAlpha),
+    activating_as_fallback_(false),
+    window_container_(shelf_container) {
+  views::Widget::InitParams params(
+      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+  params.transparent = true;
+  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  params.parent = shelf_container;
+  params.delegate = delegate_view_;
+  Init(params);
+
+  // The shelf should not take focus when initially shown.
+  set_focus_on_creation(false);
+  SetContentsView(delegate_view_);
+
+  status_area_widget_ = new internal::StatusAreaWidget(status_container);
+  status_area_widget_->CreateTrayViews();
+  if (Shell::GetInstance()->delegate()->IsSessionStarted())
+    status_area_widget_->Show();
+  Shell::GetInstance()->focus_cycler()->AddWidget(status_area_widget_);
+
+  shelf_layout_manager_ = new internal::ShelfLayoutManager(this);
+  shelf_container->SetLayoutManager(shelf_layout_manager_);
+  shelf_layout_manager_->set_workspace_controller(workspace_controller);
+  workspace_controller->SetShelf(shelf_layout_manager_);
+
+  status_container->SetLayoutManager(
+      new internal::StatusAreaLayoutManager(this));
+
+  views::Widget::AddObserver(this);
+}
+
+ShelfWidget::~ShelfWidget() {
+  RemoveObserver(this);
+}
+
+void ShelfWidget::SetPaintsBackground(
+    bool value,
+    internal::BackgroundAnimator::ChangeType change_type) {
+  background_animator_.SetPaintsBackground(value, change_type);
+}
+
+ShelfAlignment ShelfWidget::GetAlignment() const {
+  return shelf_layout_manager_->GetAlignment();
+}
+
+void ShelfWidget::SetAlignment(ShelfAlignment alignment) {
+  shelf_layout_manager_->SetAlignment(alignment);
+  shelf_layout_manager_->LayoutShelf();
+  delegate_view_->SchedulePaint();
+}
+
+void ShelfWidget::SetDimsShelf(bool dimming) {
+  delegate_view_->SetDimmed(dimming);
+}
+
+bool ShelfWidget::GetDimsShelf() const {
+  return delegate_view_->GetDimmed();
+}
+
+void ShelfWidget::CreateLauncher() {
+  if (!launcher_.get()) {
+    Shell* shell = Shell::GetInstance();
+    // This needs to be called before launcher_model().
+    shell->GetLauncherDelegate();
+    launcher_.reset(new Launcher(shell->launcher_model(),
+                                 shell->GetLauncherDelegate(),
+                                 this));
+
+    SetFocusCycler(shell->focus_cycler());
+
+    // Inform the root window controller.
+    internal::RootWindowController::ForWindow(window_container_)->
+        OnLauncherCreated();
+
+    ShellDelegate* delegate = shell->delegate();
+    if (delegate)
+      launcher_->SetVisible(delegate->IsSessionStarted());
+
+    Show();
+  }
+}
+
+bool ShelfWidget::IsLauncherVisible() const {
+  return launcher_.get() && launcher_->IsVisible();
+}
+
+void ShelfWidget::SetLauncherVisibility(bool visible) {
+  if (launcher_.get())
+    launcher_->SetVisible(visible);
+}
+
+void ShelfWidget::SetFocusCycler(internal::FocusCycler* focus_cycler) {
+  delegate_view_->set_focus_cycler(focus_cycler);
+  if (focus_cycler)
+    focus_cycler->AddWidget(this);
+}
+
+internal::FocusCycler* ShelfWidget::GetFocusCycler() {
+  return delegate_view_->focus_cycler();
+}
+
+void ShelfWidget::OnWidgetActivationChanged(views::Widget* widget,
+                                            bool active) {
+  activating_as_fallback_ = false;
+  if (active)
+    delegate_view_->SetPaneFocusAndFocusDefault();
+  else
+    delegate_view_->GetFocusManager()->ClearFocus();
+}
+
+}  // namespace ash
+