Relocate and refactor overview mode files.

ash/wm/overview/window_selector_window.cc

Index: ash/wm/overview/window_selector_window.cc
diff --git a/ash/wm/window_selector.cc b/ash/wm/overview/window_selector_window.cc
similarity index 42%
rename from ash/wm/window_selector.cc
rename to ash/wm/overview/window_selector_window.cc
index 797d83a2f6ac4cf71b8404b620bd699f7f755977..47c1dda5de6fcda8596d12fd41b8e5f547fcd1ce 100644
--- a/ash/wm/window_selector.cc
+++ b/ash/wm/overview/window_selector_window.cc
@@ -2,22 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/wm/window_selector.h"
+#include "ash/wm/overview/window_selector_window.h"
 
-#include <algorithm>
-
-#include "ash/screen_ash.h"
 #include "ash/shell.h"
-#include "ash/shell_window_ids.h"
-#include "ash/wm/window_selector_delegate.h"
-#include "ash/wm/window_util.h"
-#include "base/memory/scoped_ptr.h"
-#include "third_party/skia/include/core/SkColor.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
-#include "ui/base/events/event.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/display.h"
@@ -32,13 +23,7 @@ namespace ash {
 
 namespace {
 
-const float kCardAspectRatio = 4.0f / 3.0f;
-const int kWindowMargin = 30;
-const int kMinCardsMajor = 3;
-const int kOverviewTransitionMilliseconds = 100;
-const SkColor kWindowSelectorSelectionColor = SK_ColorBLACK;
-const float kWindowSelectorSelectionOpacity = 0.5f;
-const int kWindowSelectorSelectionPadding = 15;
+const int kOverviewWindowTransitionMilliseconds = 100;
 
 // Creates a copy of |window| with |recreated_layer| in the |target_root|.
 views::Widget* CreateCopyOfWindow(aura::RootWindow* target_root,
@@ -151,8 +136,8 @@ class WindowSelectorAnimationSettings
       ui::ScopedLayerAnimationSettings(window->layer()->GetAnimator()) {
     SetPreemptionStrategy(
         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-    SetTransitionDuration(
-        base::TimeDelta::FromMilliseconds(kOverviewTransitionMilliseconds));
+    SetTransitionDuration(base::TimeDelta::FromMilliseconds(
+        kOverviewWindowTransitionMilliseconds));
   }
 
   virtual ~WindowSelectorAnimationSettings() {
@@ -161,58 +146,6 @@ class WindowSelectorAnimationSettings
 
 }  // namespace
 
-// TODO(flackr): Split up into separate file under subdirectory in ash/wm.
-class WindowSelectorWindow {
- public:
-  explicit WindowSelectorWindow(aura::Window* window);
-  virtual ~WindowSelectorWindow();
-
-  aura::Window* window() { return window_; }
-  const aura::Window* window() const { return window_; }
-
-  // Returns true if this window selector window contains the |target|. This is
-  // used to determine if an event targetted this window.
-  bool Contains(const aura::Window* target) const;
-
-  // Restores this window on exit rather than returning it to a minimized state
-  // if it was minimized on entering overview mode.
-  void RestoreWindowOnExit();
-
-  // Informs the WindowSelectorWindow that the window being watched was
-  // destroyed. This resets the internal window pointer to avoid calling
-  // anything on the window at destruction time.
-  void OnWindowDestroyed();
-
-  // Applies a transform to the window to fit within |target_bounds| while
-  // maintaining its aspect ratio.
-  void TransformToFitBounds(aura::RootWindow* root_window,
-                            const gfx::Rect& target_bounds);
-
-  gfx::Rect bounds() { return fit_bounds_; }
-
- private:
-  // A weak pointer to the real window in the overview.
-  aura::Window* window_;
-
-  // A copy of the window used to transition the window to another root.
-  views::Widget* window_copy_;
-
-  // A weak pointer to a deep copy of the window's layers.
-  ui::Layer* layer_;
-
-  // If true, the window was minimized and should be restored if the window
-  // was not selected.
-  bool minimized_;
-
-  // The original transform of the window before entering overview mode.
-  gfx::Transform original_transform_;
-
-  // The bounds this window is fit to.
-  gfx::Rect fit_bounds_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowSelectorWindow);
-};
-
 WindowSelectorWindow::WindowSelectorWindow(aura::Window* window)
     : window_(window),
       window_copy_(NULL),
@@ -303,248 +236,4 @@ void WindowSelectorWindow::TransformToFitBounds(
   window_->SetTransform(transform);
 }
 
-// A comparator for locating a given target window.
-struct WindowSelectorWindowComparator
-    : public std::unary_function<WindowSelectorWindow*, bool> {
-  explicit WindowSelectorWindowComparator(const aura::Window* target_window)
-      : target(target_window) {
-  }
-
-  bool operator()(const WindowSelectorWindow* window) const {
-    return target == window->window();
-  }
-
-  const aura::Window* target;
-};
-
-WindowSelector::WindowSelector(const WindowList& windows,
-                               WindowSelector::Mode mode,
-                               WindowSelectorDelegate* delegate)
-    : mode_(mode),
-      delegate_(delegate),
-      selected_window_(0),
-      selection_root_(NULL) {
-  DCHECK(delegate_);
-  for (size_t i = 0; i < windows.size(); ++i) {
-    windows[i]->AddObserver(this);
-    windows_.push_back(new WindowSelectorWindow(windows[i]));
-  }
-  if (mode == WindowSelector::CYCLE)
-    selection_root_ = ash::Shell::GetActiveRootWindow();
-  PositionWindows();
-  ash::Shell::GetInstance()->AddPreTargetHandler(this);
-}
-
-WindowSelector::~WindowSelector() {
-  for (size_t i = 0; i < windows_.size(); i++) {
-    windows_[i]->window()->RemoveObserver(this);
-  }
-  ash::Shell::GetInstance()->RemovePreTargetHandler(this);
-}
-
-void WindowSelector::Step(WindowSelector::Direction direction) {
-  DCHECK(windows_.size() > 0);
-  if (!selection_widget_)
-    InitializeSelectionWidget();
-  selected_window_ = (selected_window_ + windows_.size() +
-      (direction == WindowSelector::FORWARD ? 1 : -1)) % windows_.size();
-  UpdateSelectionLocation(true);
-}
-
-void WindowSelector::SelectWindow() {
-  delegate_->OnWindowSelected(windows_[selected_window_]->window());
-}
-
-void WindowSelector::OnEvent(ui::Event* event) {
-  // If the event is targetted at any of the windows in the overview, then
-  // prevent it from propagating.
-  aura::Window* target = static_cast<aura::Window*>(event->target());
-  for (size_t i = 0; i < windows_.size(); ++i) {
-    if (windows_[i]->Contains(target)) {
-      // TODO(flackr): StopPropogation prevents generation of gesture events.
-      // We should find a better way to prevent events from being delivered to
-      // the window, perhaps a transparent window in front of the target window
-      // or using EventClientImpl::CanProcessEventsWithinSubtree.
-      event->StopPropagation();
-      break;
-    }
-  }
-
-  // This object may not be valid after this call as a selection event can
-  // trigger deletion of the window selector.
-  ui::EventHandler::OnEvent(event);
-}
-
-void WindowSelector::OnMouseEvent(ui::MouseEvent* event) {
-  if (event->type() != ui::ET_MOUSE_RELEASED)
-    return;
-  WindowSelectorWindow* target = GetEventTarget(event);
-  if (!target)
-    return;
-
-  HandleSelectionEvent(target);
-}
-
-void WindowSelector::OnTouchEvent(ui::TouchEvent* event) {
-  if (event->type() != ui::ET_TOUCH_PRESSED)
-    return;
-  WindowSelectorWindow* target = GetEventTarget(event);
-  if (!target)
-    return;
-
-  HandleSelectionEvent(target);
-}
-
-void WindowSelector::OnWindowDestroyed(aura::Window* window) {
-  ScopedVector<WindowSelectorWindow>::iterator iter =
-      std::find_if(windows_.begin(), windows_.end(),
-                   WindowSelectorWindowComparator(window));
-  DCHECK(iter != windows_.end());
-  size_t deleted_index = iter - windows_.begin();
-  (*iter)->OnWindowDestroyed();
-  windows_.erase(iter);
-  if (windows_.empty()) {
-    delegate_->OnSelectionCanceled();
-    return;
-  }
-  if (selected_window_ >= deleted_index) {
-    if (selected_window_ > deleted_index)
-      selected_window_--;
-    selected_window_ = selected_window_ % windows_.size();
-    UpdateSelectionLocation(true);
-  }
-
-  PositionWindows();
-}
-
-WindowSelectorWindow* WindowSelector::GetEventTarget(ui::LocatedEvent* event) {
-  aura::Window* target = static_cast<aura::Window*>(event->target());
-  // If the target window doesn't actually contain the event location (i.e.
-  // mouse down over the window and mouse up elsewhere) then do not select the
-  // window.
-  if (!target->HitTest(event->location()))
-    return NULL;
-
-  for (size_t i = 0; i < windows_.size(); i++) {
-    if (windows_[i]->Contains(target))
-      return windows_[i];
-  }
-  return NULL;
-}
-
-void WindowSelector::HandleSelectionEvent(WindowSelectorWindow* target) {
-  // The selected window should not be minimized when window selection is
-  // ended.
-  target->RestoreWindowOnExit();
-  delegate_->OnWindowSelected(target->window());
-}
-
-void WindowSelector::PositionWindows() {
-  if (selection_root_) {
-    DCHECK_EQ(mode_, CYCLE);
-    std::vector<WindowSelectorWindow*> windows;
-    for (size_t i = 0; i < windows_.size(); ++i)
-      windows.push_back(windows_[i]);
-    PositionWindowsOnRoot(selection_root_, windows);
-  } else {
-    DCHECK_EQ(mode_, OVERVIEW);
-    Shell::RootWindowList root_window_list = Shell::GetAllRootWindows();
-    for (size_t i = 0; i < root_window_list.size(); ++i)
-      PositionWindowsFromRoot(root_window_list[i]);
-  }
-}
-
-void WindowSelector::PositionWindowsFromRoot(aura::RootWindow* root_window) {
-  std::vector<WindowSelectorWindow*> windows;
-  for (size_t i = 0; i < windows_.size(); ++i) {
-    if (windows_[i]->window()->GetRootWindow() == root_window)
-      windows.push_back(windows_[i]);
-  }
-  PositionWindowsOnRoot(root_window, windows);
-}
-
-void WindowSelector::PositionWindowsOnRoot(
-    aura::RootWindow* root_window,
-    const std::vector<WindowSelectorWindow*>& windows) {
-  if (windows.empty())
-    return;
-
-  gfx::Size window_size;
-  gfx::Rect total_bounds = ScreenAsh::ConvertRectToScreen(root_window,
-      ScreenAsh::GetDisplayWorkAreaBoundsInParent(
-      Shell::GetContainer(root_window,
-                          internal::kShellWindowId_DefaultContainer)));
-
-  // Find the minimum number of windows per row that will fit all of the
-  // windows on screen.
-  size_t columns = std::max(
-      total_bounds.width() > total_bounds.height() ? kMinCardsMajor : 1,
-      static_cast<int>(ceil(sqrt(total_bounds.width() * windows.size() /
-                                 (kCardAspectRatio * total_bounds.height())))));
-  size_t rows = ((windows.size() + columns - 1) / columns);
-  window_size.set_width(std::min(
-      static_cast<int>(total_bounds.width() / columns),
-      static_cast<int>(total_bounds.height() * kCardAspectRatio / rows)));
-  window_size.set_height(window_size.width() / kCardAspectRatio);
-
-  // Calculate the X and Y offsets necessary to center the grid.
-  int x_offset = total_bounds.x() + ((windows.size() >= columns ? 0 :
-      (columns - windows.size()) * window_size.width()) +
-      (total_bounds.width() - columns * window_size.width())) / 2;
-  int y_offset = total_bounds.y() + (total_bounds.height() -
-      rows * window_size.height()) / 2;
-  for (size_t i = 0; i < windows.size(); ++i) {
-    gfx::Transform transform;
-    int column = i % columns;
-    int row = i / columns;
-    gfx::Rect target_bounds(window_size.width() * column + x_offset,
-                            window_size.height() * row + y_offset,
-                            window_size.width(),
-                            window_size.height());
-    target_bounds.Inset(kWindowMargin, kWindowMargin);
-    windows[i]->TransformToFitBounds(root_window, target_bounds);
-  }
-}
-
-void WindowSelector::InitializeSelectionWidget() {
-  selection_widget_.reset(new views::Widget);
-  views::Widget::InitParams params;
-  params.type = views::Widget::InitParams::TYPE_POPUP;
-  params.can_activate = false;
-  params.keep_on_top = false;
-  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
-  params.opacity = views::Widget::InitParams::OPAQUE_WINDOW;
-  params.parent = Shell::GetContainer(
-      selection_root_,
-      internal::kShellWindowId_DefaultContainer);
-  params.accept_events = false;
-  selection_widget_->set_focus_on_creation(false);
-  selection_widget_->Init(params);
-  views::View* content_view = new views::View;
-  content_view->set_background(
-      views::Background::CreateSolidBackground(kWindowSelectorSelectionColor));
-  selection_widget_->SetContentsView(content_view);
-  UpdateSelectionLocation(false);
-  selection_widget_->GetNativeWindow()->parent()->StackChildAtBottom(
-      selection_widget_->GetNativeWindow());
-  selection_widget_->Show();
-  selection_widget_->GetNativeWindow()->layer()->SetOpacity(
-      kWindowSelectorSelectionOpacity);
-}
-
-void WindowSelector::UpdateSelectionLocation(bool animate) {
-  if (!selection_widget_)
-    return;
-  gfx::Rect target_bounds = windows_[selected_window_]->bounds();
-  target_bounds.Inset(-kWindowSelectorSelectionPadding,
-                      -kWindowSelectorSelectionPadding);
-  if (animate) {
-    WindowSelectorAnimationSettings animation_settings(
-        selection_widget_->GetNativeWindow());
-    selection_widget_->SetBounds(target_bounds);
-  } else {
-    selection_widget_->SetBounds(target_bounds);
-  }
-}
-
 }  // namespace ash