Revert of Adding split view divider widget.

athena/wm/split_view_controller.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/wm/split_view_controller.h"
 
 #include <cmath>
 
 #include "athena/screen/public/screen_manager.h"
 #include "athena/wm/public/window_list_provider.h"
 #include "athena/wm/public/window_manager.h"
 #include "base/bind.h"
-#include "ui/aura/scoped_window_targeter.h"
 #include "ui/aura/window.h"
-#include "ui/aura/window_targeter.h"
 #include "ui/compositor/closure_animation_observer.h"
-#include "ui/compositor/layer.h"
+#include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
-#include "ui/views/background.h"
-#include "ui/views/layout/box_layout.h"
-#include "ui/views/widget/root_view.h"
-#include "ui/views/widget/root_view_targeter.h"
-#include "ui/views/widget/widget.h"
 #include "ui/wm/core/window_util.h"
 
 namespace athena {
 
 namespace {
 
-const int kDragHandleWidth = 4;
-const int kDragHandleHeight = 80;
-const int kDragHandleMargin = 1;
-const int kDividerWidth = kDragHandleWidth + 2 * kDragHandleMargin;
-
-// Always returns the same target.
-class StaticViewTargeterDelegate : public views::ViewTargeterDelegate {
- public:
-  explicit StaticViewTargeterDelegate(views::View* target) : target_(target) {}
-
-  virtual ~StaticViewTargeterDelegate() {}
-
- private:
-  // views::ViewTargeterDelegate:
-  virtual views::View* TargetForRect(views::View* root,
-                                     const gfx::Rect& rect) OVERRIDE {
-    return target_;
-  }
-
-  // Not owned.
-  views::View* target_;
-
-  DISALLOW_COPY_AND_ASSIGN(StaticViewTargeterDelegate);
-};
-
-// Expands the effective target area of the window of the widget containing the
-// specified view. If the view is large enough to begin with, there should be
-// no change from the default targeting behavior.
-class PriorityWindowTargeter : public aura::WindowTargeter,
-                               public aura::WindowObserver {
- public:
-  explicit PriorityWindowTargeter(views::View* priority_view)
-      : priority_view_(priority_view) {
-    CHECK(priority_view->GetWidget());
-    window_ = priority_view->GetWidget()->GetNativeWindow();
-    CHECK(window_);
-    window_->AddObserver(this);
-  }
-
-  virtual ~PriorityWindowTargeter() {
-    window_->RemoveObserver(this);
-  }
-
- private:
-  // aura::WindowTargeter:
-  virtual ui::EventTarget* FindTargetForLocatedEvent(
-      ui::EventTarget* root,
-      ui::LocatedEvent* event) OVERRIDE {
-    if (!window_ || (event->type() != ui::ET_TOUCH_PRESSED))
-      return WindowTargeter::FindTargetForLocatedEvent(root, event);
-    CHECK_EQ(window_, priority_view_->GetWidget()->GetNativeWindow());
-
-    // Bounds of the view in root window's coordinates.
-    gfx::Rect view_bounds = priority_view_->GetBoundsInScreen();
-    // If there is a transform on the window's layer - apply it.
-    gfx::Transform window_transform = window_->layer()->transform();
-    gfx::RectF transformed_bounds_f = view_bounds;
-    window_transform.TransformRect(&transformed_bounds_f);
-    gfx::Rect transformed_bounds = gfx::Rect(transformed_bounds_f.x(),
-                                             transformed_bounds_f.y(),
-                                             transformed_bounds_f.width(),
-                                             transformed_bounds_f.height());
-    // Now expand the bounds to be at least
-    // kMinTouchDimension x kMinTouchDimension and target the event to the
-    // window if it falls within the expanded bounds
-    gfx::Point center = transformed_bounds.CenterPoint();
-    gfx::Rect extension_rect = gfx::Rect(
-        center.x() - kMinTouchDimension / 2,
-        center.y() - kMinTouchDimension / 2,
-        kMinTouchDimension,
-        kMinTouchDimension);
-    gfx::Rect extended_bounds =
-        gfx::UnionRects(transformed_bounds, extension_rect);
-    if (extended_bounds.Contains(event->root_location())) {
-      root->ConvertEventToTarget(window_, event);
-      return window_;
-    }
-
-    return WindowTargeter::FindTargetForLocatedEvent(root, event);
-  }
-
-  // aura::WindowObserver:
-  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {
-    DCHECK_EQ(window, window_);
-    window_->RemoveObserver(this);
-    window_ = NULL;
-  }
-
-  // Minimum dimension of a target to be comfortably touchable.
-  // The effective touch target area of |priority_window_| gets expanded so
-  // that it's width and height is ayt least |kMinTouchDimension|.
-  int const kMinTouchDimension = 26;
-
-  aura::Window* window_;
-  views::View* priority_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(PriorityWindowTargeter);
-};
-
-// Returns a target transform required to transform |from| to |to|.
-gfx::Transform GetTransformForBounds(const gfx::Rect& from,
-                                     const gfx::Rect& to) {
+// Returns a target transform which is suitable for animating a windows's
+// bounds.
+gfx::Transform GetTargetTransformForBoundsAnimation(const gfx::Rect& from,
+                                                    const gfx::Rect& to) {
   gfx::Transform transform;
   transform.Translate(to.x() - from.x(), to.y() - from.y());
   transform.Scale(to.width() / static_cast<float>(from.width()),
                   to.height() / static_cast<float>(from.height()));
   return transform;
 }
 
 bool IsLandscapeOrientation(gfx::Display::Rotation rotation) {
   return rotation == gfx::Display::ROTATE_0 ||
          rotation == gfx::Display::ROTATE_180;
 }
 
 }  // namespace
 
 SplitViewController::SplitViewController(
     aura::Window* container,
     WindowListProvider* window_list_provider)
     : state_(INACTIVE),
       container_(container),
       window_list_provider_(window_list_provider),
       left_window_(NULL),
       right_window_(NULL),
-      divider_position_(0),
-      divider_scroll_start_position_(0),
-      divider_widget_(NULL),
-      drag_handle_(NULL),
+      separator_position_(0),
       weak_factory_(this) {
 }
 
 SplitViewController::~SplitViewController() {
 }
 
 bool SplitViewController::CanActivateSplitViewMode() const {
   // TODO(mfomitchev): return false in full screen.
   return (!IsSplitViewModeActive() &&
               window_list_provider_->GetWindowList().size() >= 2 &&
@@ skipping 33 matching lines @@
       iter++;
     }
   }
 
   to_hide_.clear();
   if (left_window_ && left_window_ != left && left_window_ != right)
     to_hide_.push_back(left_window_);
   if (right_window_ && right_window_ != left && right_window_ != right)
     to_hide_.push_back(right_window_);
 
-  divider_position_ = GetDefaultDividerPosition();
   SetState(ACTIVE);
   right_window_ = right;
   left_window_ = left;
   UpdateLayout(true);
 }
 
 void SplitViewController::ReplaceWindow(aura::Window* window,
                                         aura::Window* replace_with) {
   CHECK(IsSplitViewModeActive());
   CHECK(replace_with);
@@ skipping 11 matching lines @@
   window->Hide();
 }
 
 void SplitViewController::DeactivateSplitMode() {
   CHECK_EQ(ACTIVE, state_);
   SetState(INACTIVE);
   UpdateLayout(false);
   left_window_ = right_window_ = NULL;
 }
 
-void SplitViewController::InitializeDivider() {
-  CHECK(!divider_widget_);
-  CHECK(!drag_handle_);
-
-  drag_handle_ = CreateDragHandleView(DRAG_HANDLE_HORIZONTAL,
-                                     this,
-                                     kDragHandleWidth,
-                                     kDragHandleHeight);
-  views::View* content_view = new views::View;
-  content_view->set_background(
-      views::Background::CreateSolidBackground(SK_ColorBLACK));
-  views::BoxLayout* layout =
-      new views::BoxLayout(views::BoxLayout::kHorizontal,
-                           kDragHandleMargin,
-                           kDragHandleMargin,
-                           0);
-  layout->set_main_axis_alignment(views::BoxLayout::MAIN_AXIS_ALIGNMENT_CENTER);
-  layout->set_cross_axis_alignment(
-      views::BoxLayout::CROSS_AXIS_ALIGNMENT_CENTER);
-  content_view->SetLayoutManager(layout);
-  content_view->AddChildView(drag_handle_);
-
-  divider_widget_ = new views::Widget();
-  views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
-  params.parent = container_;
-  params.bounds = gfx::Rect(-kDividerWidth / 2,
-                            0,
-                            kDividerWidth,
-                            container_->bounds().height());
-  divider_widget_->Init(params);
-  divider_widget_->SetContentsView(content_view);
-
-  // Install a static view targeter on the root view which always targets
-  // divider_view.
-  // TODO(mfomitchev,tdanderson): This should not be needed:
-  // 1. crbug.com/414339 - divider_view is the only view and it completely
-  //    overlaps the root view.
-  // 2. The logic in ViewTargeterDelegate::TargetForRect could be improved to
-  //    work better for views that are narrow in one dimension and long in
-  //    another dimension.
-  views::internal::RootView* root_view =
-      static_cast<views::internal::RootView*>(divider_widget_->GetRootView());
-  view_targeter_delegate_.reset(new StaticViewTargeterDelegate(drag_handle_));
-  views::ViewTargeter* targeter =
-      new views::RootViewTargeter(view_targeter_delegate_.get(), root_view);
-  divider_widget_->GetRootView()->SetEventTargeter(
-      scoped_ptr<views::ViewTargeter>(targeter));
+gfx::Rect SplitViewController::GetLeftTargetBounds() {
+  gfx::Rect work_area =
+      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area();
+  return gfx::Rect(0, 0, container_->bounds().width() / 2, work_area.height());
 }
 
-void SplitViewController::HideDivider() {
-  divider_widget_->Hide();
-  window_targeter_.reset();
-}
-
-void SplitViewController::ShowDivider() {
-  divider_widget_->Show();
-  if (!window_targeter_) {
-    scoped_ptr<ui::EventTargeter> window_targeter =
-        scoped_ptr<ui::EventTargeter>(new PriorityWindowTargeter(drag_handle_));
-    window_targeter_.reset(
-        new aura::ScopedWindowTargeter(container_, window_targeter.Pass()));
-  }
-}
-
-gfx::Rect SplitViewController::GetLeftAreaBounds() {
-  gfx::Rect work_area =
-      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area();
-  return gfx::Rect(
-      0, 0, divider_position_ - kDividerWidth / 2, work_area.height());
-}
-
-gfx::Rect SplitViewController::GetRightAreaBounds() {
+gfx::Rect SplitViewController::GetRightTargetBounds() {
   gfx::Rect work_area =
       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area();
   int container_width = container_->bounds().width();
-  return gfx::Rect(divider_position_ + kDividerWidth / 2,
-                   0,
-                   container_width - divider_position_ - kDividerWidth / 2,
-                   work_area.height());
+  return gfx::Rect(
+      container_width / 2, 0, container_width / 2, work_area.height());
 }
 
 void SplitViewController::SetState(SplitViewController::State state) {
   if (state_ == state)
     return;
 
-  if (divider_widget_ == NULL)
-    InitializeDivider();
-
   state_ = state;
-
   ScreenManager::Get()->SetRotationLocked(state_ != INACTIVE);
-  if (state == INACTIVE)
-    HideDivider();
-  else
-    ShowDivider();
 }
 
 void SplitViewController::UpdateLayout(bool animate) {
   CHECK(left_window_);
   CHECK(right_window_);
+
   // Splitview can be activated from SplitViewController::ActivateSplitMode or
   // SplitViewController::ScrollEnd. Additionally we don't want to rotate the
   // screen while engaging splitview (i.e. state_ == SCROLLING).
   if (state_ == INACTIVE && !animate) {
-    gfx::Rect work_area =
-        gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area();
-    aura::Window* top_window = window_list_provider_->GetWindowList().back();
-    if (top_window != left_window_) {
-      // TODO(mfomitchev): Use to_hide_ instead
+    if (!wm::IsActiveWindow(left_window_))
       left_window_->Hide();
-      right_window_->SetBounds(gfx::Rect(work_area.size()));
-    }
-    if (top_window != right_window_) {
-      left_window_->SetBounds(gfx::Rect(work_area.size()));
-      // TODO(mfomitchev): Use to_hide_ instead
+    if (!wm::IsActiveWindow(right_window_))
       right_window_->Hide();
-    }
-    SetWindowTransforms(
-        gfx::Transform(), gfx::Transform(), gfx::Transform(), false);
+    SetWindowTransforms(gfx::Transform(), gfx::Transform(), false);
     return;
   }
 
   left_window_->Show();
   right_window_->Show();
   window_list_provider_->MoveToFront(right_window_);
   window_list_provider_->MoveToFront(left_window_);
 
-  gfx::Transform divider_transform;
-  divider_transform.Translate(divider_position_, 0);
   if (state_ == ACTIVE) {
     if (animate) {
-      gfx::Transform left_transform =
-          GetTransformForBounds(left_window_->bounds(), GetLeftAreaBounds());
-      gfx::Transform right_transform =
-          GetTransformForBounds(right_window_->bounds(), GetRightAreaBounds());
-      SetWindowTransforms(
-          left_transform, right_transform, divider_transform, true);
+      gfx::Transform left_transform = GetTargetTransformForBoundsAnimation(
+          left_window_->bounds(), GetLeftTargetBounds());
+      gfx::Transform right_transform = GetTargetTransformForBoundsAnimation(
+          right_window_->bounds(), GetRightTargetBounds());
+      SetWindowTransforms(left_transform, right_transform, true);
     } else {
-      left_window_->SetBounds(GetLeftAreaBounds());
-      right_window_->SetBounds(GetRightAreaBounds());
-      SetWindowTransforms(
-          gfx::Transform(), gfx::Transform(), divider_transform, false);
+      left_window_->SetBounds(GetLeftTargetBounds());
+      right_window_->SetBounds(GetRightTargetBounds());
+      SetWindowTransforms(gfx::Transform(), gfx::Transform(), false);
     }
   } else {
     gfx::Transform left_transform;
+    left_transform.Translate(separator_position_ - container_->bounds().width(),
+                             0);
     gfx::Transform right_transform;
-    gfx::Rect left_area_bounds = GetLeftAreaBounds();
-    gfx::Rect right_area_bounds = GetRightAreaBounds();
-    // If the width of the window is greater than the width of the area which it
-    // is supposed to occupy - translate the window. Otherwise scale the window
-    // up to fill the target area.
-    if (left_window_->bounds().width() >= left_area_bounds.width()) {
-      left_transform.Translate(
-          left_area_bounds.right() - left_window_->bounds().right(), 0);
-    } else {
-      left_transform =
-          GetTransformForBounds(left_window_->bounds(), left_area_bounds);
-    }
-    if (right_window_->bounds().width() >= right_area_bounds.width()) {
-      right_transform.Translate(
-          right_area_bounds.x() - right_window_->bounds().x(), 0);
-    } else {
-      right_transform =
-          GetTransformForBounds(right_window_->bounds(), right_area_bounds);
-    }
-    SetWindowTransforms(
-        left_transform, right_transform, divider_transform, animate);
+    right_transform.Translate(separator_position_, 0);
+    SetWindowTransforms(left_transform, right_transform, animate);
   }
   // Note: |left_window_| and |right_window_| may be NULL if calling
   // SetWindowTransforms():
   // - caused the in-progress animation to abort.
   // - started a zero duration animation.
 }
 
 void SplitViewController::SetWindowTransforms(
     const gfx::Transform& left_transform,
     const gfx::Transform& right_transform,
-    const gfx::Transform& divider_transform,
     bool animate) {
   if (animate) {
     ui::ScopedLayerAnimationSettings left_settings(
         left_window_->layer()->GetAnimator());
     left_settings.SetPreemptionStrategy(
         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
     left_window_->SetTransform(left_transform);
 
-    ui::ScopedLayerAnimationSettings divider_widget_settings(
-        divider_widget_->GetNativeWindow()->layer()->GetAnimator());
-    divider_widget_settings.SetPreemptionStrategy(
-        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-    divider_widget_->GetNativeWindow()->SetTransform(divider_transform);
-
     ui::ScopedLayerAnimationSettings right_settings(
         right_window_->layer()->GetAnimator());
     right_settings.SetPreemptionStrategy(
         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
     right_settings.AddObserver(new ui::ClosureAnimationObserver(
         base::Bind(&SplitViewController::OnAnimationCompleted,
                    weak_factory_.GetWeakPtr())));
     right_window_->SetTransform(right_transform);
   } else {
     left_window_->SetTransform(left_transform);
-    divider_widget_->GetNativeWindow()->SetTransform(divider_transform);
     right_window_->SetTransform(right_transform);
   }
 }
 
 void SplitViewController::OnAnimationCompleted() {
   // Animation can be cancelled when deactivated.
   if (left_window_ == NULL)
     return;
   UpdateLayout(false);
 
   for (size_t i = 0; i < to_hide_.size(); ++i)
     to_hide_[i]->Hide();
   to_hide_.clear();
 
   if (state_ == INACTIVE) {
     left_window_ = NULL;
     right_window_ = NULL;
   }
 }
 
-int SplitViewController::GetDefaultDividerPosition() {
-  return container_->GetBoundsInScreen().width() / 2;
+void SplitViewController::UpdateSeparatorPositionFromScrollDelta(float delta) {
+  gfx::Screen* screen = gfx::Screen::GetScreenFor(container_);
+  const gfx::Rect& display_bounds =
+      screen->GetDisplayNearestWindow(container_).bounds();
+  gfx::Rect container_bounds = container_->GetBoundsInScreen();
+  separator_position_ =
+      delta > 0 ? ((int)delta) + display_bounds.x() - container_bounds.x()
+                : display_bounds.right() - container_bounds.x() + delta;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // BezelController::ScrollDelegate:
 
-void SplitViewController::BezelScrollBegin(BezelController::Bezel bezel,
-                                           float delta) {
-  if (!BezelCanScroll())
+void SplitViewController::ScrollBegin(BezelController::Bezel bezel,
+                                      float delta) {
+  if (!CanScroll())
     return;
-
   SetState(SCROLLING);
 
   const aura::Window::Windows& windows = window_list_provider_->GetWindowList();
   CHECK(windows.size() >= 2);
   aura::Window::Windows::const_reverse_iterator iter = windows.rbegin();
   aura::Window* current_window = *(iter);
+  CHECK(wm::IsActiveWindow(current_window));
 
   if (delta > 0) {
     right_window_ = current_window;
     left_window_ = *(iter + 1);
   } else {
     left_window_ = current_window;
     right_window_ = *(iter + 1);
   }
 
   CHECK(left_window_);
   CHECK(right_window_);
 
-  // Calculate divider_scroll_start_position_
-  gfx::Screen* screen = gfx::Screen::GetScreenFor(container_);
-  const gfx::Rect& display_bounds =
-      screen->GetDisplayNearestWindow(container_).bounds();
-  gfx::Rect container_bounds = container_->GetBoundsInScreen();
-  divider_scroll_start_position_ =
-      delta > 0 ? display_bounds.x() - container_bounds.x()
-                : display_bounds.right() - container_bounds.x();
-
-  divider_position_ = divider_scroll_start_position_ + delta;
+  UpdateSeparatorPositionFromScrollDelta(delta);
   UpdateLayout(false);
 }
 
-void SplitViewController::BezelScrollEnd() {
+void SplitViewController::ScrollEnd() {
   if (state_ != SCROLLING)
     return;
 
   // Max distance from the scroll end position to the middle of the screen where
   // we would go into the split view mode.
   const int kMaxDistanceFromMiddle = 120;
-  const int default_divider_position = GetDefaultDividerPosition();
-  if (std::abs(default_divider_position - divider_position_) <=
+  int container_width = container_->GetBoundsInScreen().width();
+  if (std::abs(container_width / 2 - separator_position_) <=
       kMaxDistanceFromMiddle) {
-    divider_position_ = default_divider_position;
     SetState(ACTIVE);
-  } else if (divider_position_ < default_divider_position) {
-    divider_position_ = 0;
+    separator_position_ = container_width / 2;
+  } else if (separator_position_ < container_width / 2) {
+    separator_position_ = 0;
     SetState(INACTIVE);
     wm::ActivateWindow(right_window_);
   } else {
-    divider_position_ = container_->GetBoundsInScreen().width();
+    separator_position_ = container_width;
     SetState(INACTIVE);
     wm::ActivateWindow(left_window_);
   }
   UpdateLayout(true);
 }
 
-void SplitViewController::BezelScrollUpdate(float delta) {
+void SplitViewController::ScrollUpdate(float delta) {
   if (state_ != SCROLLING)
     return;
-  divider_position_ = divider_scroll_start_position_ + delta;
+  UpdateSeparatorPositionFromScrollDelta(delta);
   UpdateLayout(false);
 }
 
-bool SplitViewController::BezelCanScroll() {
+bool SplitViewController::CanScroll() {
   return CanActivateSplitViewMode();
 }
 
-///////////////////////////////////////////////////////////////////////////////
-// DragHandleScrollDelegate:
-
-void SplitViewController::HandleScrollBegin(float delta) {
-  CHECK(state_ == ACTIVE);
-  state_ = SCROLLING;
-  divider_scroll_start_position_ = GetDefaultDividerPosition();
-  divider_position_ = divider_scroll_start_position_ + delta;
-  UpdateLayout(false);
-}
-
-void SplitViewController::HandleScrollEnd() {
-  BezelScrollEnd();
-}
-
-void SplitViewController::HandleScrollUpdate(float delta) {
-  BezelScrollUpdate(delta);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// WindowManagerObserver:
-
-void SplitViewController::OnOverviewModeEnter() {
-  if (divider_widget_)
-    HideDivider();
-}
-
-void SplitViewController::OnOverviewModeExit() {
-  if (state_ != INACTIVE)
-    ShowDivider();
-}
-
-void SplitViewController::OnSplitViewModeEnter() {
-}
-
-void SplitViewController::OnSplitViewModeExit() {
-}
-
 }  // namespace athena