Relocate and refactor overview mode files.

ash/wm/overview/window_selector.cc

+// Copyright 2013 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/wm/overview/window_selector.h"
+
+#include <algorithm>
+
+#include "ash/screen_ash.h"
+#include "ash/shell.h"
+#include "ash/shell_window_ids.h"
+#include "ash/wm/overview/window_selector_delegate.h"
+#include "ash/wm/overview/window_selector_window.h"
+#include "ash/wm/window_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/aura/root_window.h"
+#include "ui/aura/window.h"
+#include "ui/base/events/event.h"
+#include "ui/compositor/scoped_layer_animation_settings.h"
+#include "ui/views/widget/widget.h"
+
+namespace ash {
+
+namespace {
+
+const float kCardAspectRatio = 4.0f / 3.0f;
+const int kWindowMargin = 30;
+const int kMinCardsMajor = 3;
+const int kOverviewSelectorTransitionMilliseconds = 100;
+const SkColor kWindowSelectorSelectionColor = SK_ColorBLACK;
+const float kWindowSelectorSelectionOpacity = 0.5f;
+const int kWindowSelectorSelectionPadding = 15;
+
+// 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;
+};
+
+}  // namespace
+
+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) {
+    ui::ScopedLayerAnimationSettings animation_settings(
+        selection_widget_->GetNativeWindow()->layer()->GetAnimator());
+    animation_settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
+        kOverviewSelectorTransitionMilliseconds));
+    animation_settings.SetPreemptionStrategy(
+        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
+    selection_widget_->SetBounds(target_bounds);
+  } else {
+    selection_widget_->SetBounds(target_bounds);
+  }
+}
+
+}  // namespace ash