Merge WindowOverview into WindowSelector

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/accessibility_delegate.h"
 #include "ash/ash_switches.h"
+#include "ash/metrics/user_metrics_recorder.h"
 #include "ash/root_window_controller.h"
+#include "ash/screen_util.h"
 #include "ash/shell.h"
+#include "ash/shell_window_ids.h"
 #include "ash/switchable_windows.h"
-#include "ash/wm/overview/window_overview.h"
+#include "ash/wm/overview/scoped_transform_overview_window.h"
 #include "ash/wm/overview/window_selector_delegate.h"
+#include "ash/wm/overview/window_selector_item.h"
 #include "ash/wm/overview/window_selector_panels.h"
 #include "ash/wm/overview/window_selector_window.h"
 #include "ash/wm/window_state.h"
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/aura/client/cursor_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/window.h"
+#include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_observer.h"
+#include "ui/compositor/layer_animation_observer.h"
+#include "ui/compositor/scoped_layer_animation_settings.h"
+#include "ui/events/event.h"
+#include "ui/gfx/screen.h"
+#include "ui/views/background.h"
+#include "ui/views/widget/widget.h"
 #include "ui/wm/core/window_util.h"
 #include "ui/wm/public/activation_client.h"
 
 namespace ash {
 
 namespace {
 
-// A comparator for locating a given selectable window.
+// Conceptually the window overview is a table or grid of cells having this
+// fixed aspect ratio. The number of columns is determined by maximizing the
+// area of them based on the number of windows.
+const float kCardAspectRatio = 4.0f / 3.0f;
+
+// In the conceptual overview table, the window margin is the space reserved
+// around the window within the cell. This margin does not overlap so the
+// closest distance between adjacent windows will be twice this amount.
+const int kWindowMargin = 30;
+
+// The minimum number of cards along the major axis (i.e. horizontally on a
+// landscape orientation).
+const int kMinCardsMajor = 3;
+
+// The duration of transition animations on the overview selector.
+const int kOverviewSelectorTransitionMilliseconds = 100;
+
+// The color and opacity of the overview selector.
+const SkColor kWindowOverviewSelectionColor = SK_ColorBLACK;
+const float kWindowOverviewSelectionOpacity = 0.5f;
+
+// The padding or amount of the window selector widget visible around the edges
+// of the currently selected window.
+const int kWindowOverviewSelectionPadding = 25;
+
+// A comparator for locating a given target window.
 struct WindowSelectorItemComparator
     : public std::unary_function<WindowSelectorItem*, bool> {
-  explicit WindowSelectorItemComparator(const aura::Window* window)
-      : window_(window) {
+  explicit WindowSelectorItemComparator(const aura::Window* target_window)
+      : target(target_window) {
   }
 
   bool operator()(WindowSelectorItem* window) const {
-    return window->HasSelectableWindow(window_);
+    return window->TargetedWindow(target) != NULL;
   }
 
-  const aura::Window* window_;
+  const aura::Window* target;
 };
 
+// An observer which holds onto the passed widget until the animation is
+// complete.
+class CleanupWidgetAfterAnimationObserver : public ui::LayerAnimationObserver {
+ public:
+  explicit CleanupWidgetAfterAnimationObserver(
+      scoped_ptr<views::Widget> widget);
+
+  // ui::LayerAnimationObserver:
+  virtual void OnLayerAnimationEnded(
+      ui::LayerAnimationSequence* sequence) OVERRIDE;
+  virtual void OnLayerAnimationAborted(
+      ui::LayerAnimationSequence* sequence) OVERRIDE;
+  virtual void OnLayerAnimationScheduled(
+      ui::LayerAnimationSequence* sequence) OVERRIDE;
+
+ private:
+  virtual ~CleanupWidgetAfterAnimationObserver();
+
+  scoped_ptr<views::Widget> widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(CleanupWidgetAfterAnimationObserver);
+};
+
+CleanupWidgetAfterAnimationObserver::CleanupWidgetAfterAnimationObserver(
+    scoped_ptr<views::Widget> widget)
+    : widget_(widget.Pass()) {
+  widget_->GetNativeWindow()->layer()->GetAnimator()->AddObserver(this);
+}
+
+CleanupWidgetAfterAnimationObserver::~CleanupWidgetAfterAnimationObserver() {
+  widget_->GetNativeWindow()->layer()->GetAnimator()->RemoveObserver(this);
+}
+
+void CleanupWidgetAfterAnimationObserver::OnLayerAnimationEnded(
+    ui::LayerAnimationSequence* sequence) {
+  delete this;
+}
+
+void CleanupWidgetAfterAnimationObserver::OnLayerAnimationAborted(
+    ui::LayerAnimationSequence* sequence) {
+  delete this;
+}
+
+void CleanupWidgetAfterAnimationObserver::OnLayerAnimationScheduled(
+    ui::LayerAnimationSequence* sequence) {
+}
+
 // A comparator for locating a selectable window given a targeted window.
 struct WindowSelectorItemTargetComparator
     : public std::unary_function<WindowSelectorItem*, bool> {
   explicit WindowSelectorItemTargetComparator(const aura::Window* target_window)
       : target(target_window) {
   }
 
   bool operator()(WindowSelectorItem* window) const {
     return window->TargetedWindow(target) != NULL;
   }
@@ skipping 83 matching lines @@
           kSwitchableWindowContainerIds[i]);
       container->AddObserver(this);
       observed_windows_.insert(container);
     }
   }
 
   StartOverview();
 }
 
 WindowSelector::~WindowSelector() {
+  ash::Shell* shell = ash::Shell::GetInstance();
+
   ResetFocusRestoreWindow(true);
   for (std::set<aura::Window*>::iterator iter = observed_windows_.begin();
        iter != observed_windows_.end(); ++iter) {
     (*iter)->RemoveObserver(this);
   }
-  Shell::GetInstance()->activation_client()->RemoveObserver(this);
+  shell->activation_client()->RemoveObserver(this);
   aura::Window::Windows root_windows = Shell::GetAllRootWindows();
-  window_overview_.reset();
+
+  const aura::WindowTracker::Windows hidden_windows(hidden_windows_.windows());
+  for (aura::WindowTracker::Windows::const_iterator iter =
+       hidden_windows.begin(); iter != hidden_windows.end(); ++iter) {
+    ui::ScopedLayerAnimationSettings settings(
+        (*iter)->layer()->GetAnimator());
+    settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
+        ScopedTransformOverviewWindow::kTransitionMilliseconds));
+    settings.SetPreemptionStrategy(
+        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
+    (*iter)->layer()->SetOpacity(1);
+    (*iter)->Show();
+  }
+
+  if (cursor_client_)
+    cursor_client_->UnlockCursor();
+  shell->RemovePreTargetHandler(this);
+  shell->GetScreen()->RemoveObserver(this);
+  UMA_HISTOGRAM_MEDIUM_TIMES(
+      "Ash.WindowSelector.TimeInOverview",
+      base::Time::Now() - overview_start_time_);
+
+  // TODO(nsatragno): Change this to OnOverviewModeEnded and move it to when
+  // everything is done.
+  shell->OnOverviewModeEnding();
+
   // Clearing the window list resets the ignored_by_shelf flag on the windows.
   windows_.clear();
   UpdateShelfVisibility();
 }
 
 void WindowSelector::SelectWindow(aura::Window* window) {
   ResetFocusRestoreWindow(false);
   ScopedVector<WindowSelectorItem>::iterator iter =
       std::find_if(windows_.begin(), windows_.end(),
                    WindowSelectorItemTargetComparator(window));
   DCHECK(iter != windows_.end());
   // The selected window should not be minimized when window selection is
   // ended.
   (*iter)->RestoreWindowOnExit(window);
   delegate_->OnWindowSelected(window);
 }
 
 void WindowSelector::CancelSelection() {
   delegate_->OnSelectionCanceled();
 }
 
+void WindowSelector::OnKeyEvent(ui::KeyEvent* event) {
+  if (GetTargetedWindow(static_cast<aura::Window*>(event->target())))
+    event->StopPropagation();
+  if (event->type() != ui::ET_KEY_PRESSED)
+    return;
+
+  if (event->key_code() == ui::VKEY_ESCAPE)
+    CancelSelection();
+}
+
+void WindowSelector::OnMouseEvent(ui::MouseEvent* event) {
+  aura::Window* target = GetEventTarget(event);
+  if (!target)
+    return;
+
+  event->SetHandled();
+  if (event->type() != ui::ET_MOUSE_RELEASED)
+    return;
+
+  SelectWindow(target);
+}
+
+void WindowSelector::OnScrollEvent(ui::ScrollEvent* event) {
+  // Set the handled flag to prevent delivering scroll events to the window but
+  // still allowing other pretarget handlers to process the scroll event.
+  if (GetTargetedWindow(static_cast<aura::Window*>(event->target())))
+    event->SetHandled();
+}
+
+void WindowSelector::OnTouchEvent(ui::TouchEvent* event) {
+  // Existing touches should be allowed to continue. This prevents getting
+  // stuck in a gesture or with pressed fingers being tracked elsewhere.
+  if (event->type() != ui::ET_TOUCH_PRESSED)
+    return;
+
+  aura::Window* target = GetEventTarget(event);
+  if (!target)
+    return;
+
+  // 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 and then a tap
+  // gesture could be used to activate the window.
+  event->SetHandled();
+  SelectWindow(target);
+}
+
+void WindowSelector::OnDisplayBoundsChanged(const gfx::Display& display) {
+  PositionWindows(/* animate */ false);
+}
+
+void WindowSelector::OnDisplayAdded(const gfx::Display& display) {
+}
+
+void WindowSelector::OnDisplayRemoved(const gfx::Display& display) {
+}
+
 void WindowSelector::OnWindowAdded(aura::Window* new_window) {
   if (new_window->type() != ui::wm::WINDOW_TYPE_NORMAL &&
       new_window->type() != ui::wm::WINDOW_TYPE_PANEL) {
     return;
   }
 
   for (size_t i = 0; i < kSwitchableWindowContainerIdsLength; ++i) {
     if (new_window->parent()->id() == kSwitchableWindowContainerIds[i] &&
         !::wm::GetTransientParent(new_window)) {
       // The new window is in one of the switchable containers, abort overview.
@@ skipping 20 matching lines @@
   // If there are still windows in this selector entry then the overview is
   // still active and the active selection remains the same.
   if (!(*iter)->empty())
     return;
 
   windows_.erase(iter);
   if (windows_.empty()) {
     CancelSelection();
     return;
   }
-  if (window_overview_)
-    window_overview_->OnWindowsChanged();
+  PositionWindows(true);
 }
 
 void WindowSelector::OnWindowBoundsChanged(aura::Window* window,
                                            const gfx::Rect& old_bounds,
                                            const gfx::Rect& new_bounds) {
-  if (!window_overview_)
-    return;
-
   ScopedVector<WindowSelectorItem>::iterator iter =
       std::find_if(windows_.begin(), windows_.end(),
                    WindowSelectorItemTargetComparator(window));
   if (iter == windows_.end())
     return;
 
   // Immediately finish any active bounds animation.
   window->layer()->GetAnimator()->StopAnimatingProperty(
       ui::LayerAnimationElement::BOUNDS);
 
@@ skipping 13 matching lines @@
 void WindowSelector::OnAttemptToReactivateWindow(aura::Window* request_active,
                                                  aura::Window* actual_active) {
   if (ignore_activations_)
     return;
   // Don't restore focus on exit if a window was just activated.
   ResetFocusRestoreWindow(false);
   CancelSelection();
 }
 
 void WindowSelector::StartOverview() {
-  DCHECK(!window_overview_);
   // Remove focus from active window before entering overview.
   aura::client::GetFocusClient(
       Shell::GetPrimaryRootWindow())->FocusWindow(NULL);
 
-  window_overview_.reset(new WindowOverview(this, &windows_));
+  Shell* shell = Shell::GetInstance();
+  shell->OnOverviewModeStarting();
+
+  for (WindowSelectorItemList::iterator iter = windows_.begin();
+       iter != windows_.end(); ++iter) {
+    (*iter)->PrepareForOverview();
+  }
+  PositionWindows(/* animate */ true);
+  DCHECK(!windows_.empty());
+  cursor_client_ = aura::client::GetCursorClient(
+      windows_.front()->GetRootWindow());
+  if (cursor_client_) {
+    cursor_client_->SetCursor(ui::kCursorPointer);
+    cursor_client_->ShowCursor();
+    // TODO(flackr): Only prevent cursor changes for windows in the overview.
+    // This will be easier to do without exposing the overview mode code if the
+    // cursor changes are moved to ToplevelWindowEventHandler::HandleMouseMoved
+    // as suggested there.
+    cursor_client_->LockCursor();
+  }
+  shell->PrependPreTargetHandler(this);
+  shell->GetScreen()->AddObserver(this);
+  shell->metrics()->RecordUserMetricsAction(UMA_WINDOW_OVERVIEW);
+  HideAndTrackNonOverviewWindows();
+  // Send an a11y alert.
+  shell->accessibility_delegate()->TriggerAccessibilityAlert(
+      A11Y_ALERT_WINDOW_OVERVIEW_MODE_ENTERED);
+
   UpdateShelfVisibility();
 }
 
+void WindowSelector::PositionWindows(bool animate) {
+  aura::Window::Windows root_window_list = Shell::GetAllRootWindows();
+  for (size_t i = 0; i < root_window_list.size(); ++i)
+    PositionWindowsFromRoot(root_window_list[i], animate);
+}
+
+void WindowSelector::PositionWindowsFromRoot(aura::Window* root_window,
+                                             bool animate) {
+  std::vector<WindowSelectorItem*> windows;
+  for (WindowSelectorItemList::iterator iter = windows_.begin();
+       iter != windows_.end(); ++iter) {
+    if ((*iter)->GetRootWindow() == root_window)
+      windows.push_back(*iter);
+  }
+
+  if (windows.empty())
+    return;
+
+  gfx::Size window_size;
+  gfx::Rect total_bounds = ScreenUtil::ConvertRectToScreen(
+      root_window,
+      ScreenUtil::GetDisplayWorkAreaBoundsInParent(
+          Shell::GetContainer(root_window, 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]->SetBounds(root_window, target_bounds, animate);
+  }
+}
+
+void WindowSelector::HideAndTrackNonOverviewWindows() {
+  // Add the windows to hidden_windows first so that if any are destroyed
+  // while hiding them they are tracked.
+  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
+  for (aura::Window::Windows::const_iterator root_iter = root_windows.begin();
+       root_iter != root_windows.end(); ++root_iter) {
+    for (size_t i = 0; i < kSwitchableWindowContainerIdsLength; ++i) {
+      aura::Window* container = Shell::GetContainer(*root_iter,
+          kSwitchableWindowContainerIds[i]);
+      for (aura::Window::Windows::const_iterator iter =
+           container->children().begin(); iter != container->children().end();
+           ++iter) {
+        if (GetTargetedWindow(*iter) || !(*iter)->IsVisible())
+          continue;
+        hidden_windows_.Add(*iter);
+      }
+    }
+  }
+
+  // Copy the window list as it can change during iteration.
+  const aura::WindowTracker::Windows hidden_windows(hidden_windows_.windows());
+  for (aura::WindowTracker::Windows::const_iterator iter =
+       hidden_windows.begin(); iter != hidden_windows.end(); ++iter) {
+    if (!hidden_windows_.Contains(*iter))
+      continue;
+    ui::ScopedLayerAnimationSettings settings(
+        (*iter)->layer()->GetAnimator());
+    settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
+        ScopedTransformOverviewWindow::kTransitionMilliseconds));
+    settings.SetPreemptionStrategy(
+        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
+    (*iter)->Hide();
+    // Hiding the window can result in it being destroyed.
+    if (!hidden_windows_.Contains(*iter))
+      continue;
+    (*iter)->layer()->SetOpacity(0);
+  }
+}
+
 void WindowSelector::ResetFocusRestoreWindow(bool focus) {
   if (!restore_focus_window_)
     return;
   if (focus) {
     base::AutoReset<bool> restoring_focus(&ignore_activations_, true);
     restore_focus_window_->Focus();
   }
   // If the window is in the observed_windows_ list it needs to continue to be
   // observed.
   if (observed_windows_.find(restore_focus_window_) ==
           observed_windows_.end()) {
     restore_focus_window_->RemoveObserver(this);
   }
   restore_focus_window_ = NULL;
 }
 
+aura::Window* 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->ContainsPoint(event->location()))
+    return NULL;
+
+  return GetTargetedWindow(target);
+}
+
+aura::Window* WindowSelector::GetTargetedWindow(aura::Window* window) {
+  for (WindowSelectorItemList::iterator iter = windows_.begin();
+       iter != windows_.end(); ++iter) {
+    aura::Window* selected = (*iter)->TargetedWindow(window);
+    if (selected)
+      return selected;
+  }
+  return NULL;
+}
+
 }  // namespace ash