chromeos: Move files in //ash/common to //ash

ash/common/wm/window_cycle_list.cc

Index: ash/common/wm/window_cycle_list.cc
diff --git a/ash/common/wm/window_cycle_list.cc b/ash/common/wm/window_cycle_list.cc
deleted file mode 100644
index 78c7a771a552403f7448237bfe7a6cc95349e376..0000000000000000000000000000000000000000
--- a/ash/common/wm/window_cycle_list.cc
+++ /dev/null
@@ -1,551 +0,0 @@
-// 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 "ash/common/wm/window_cycle_list.h"
-
-#include <list>
-#include <map>
-
-#include "ash/common/wm/mru_window_tracker.h"
-#include "ash/common/wm/window_state.h"
-#include "ash/common/wm_shell.h"
-#include "ash/common/wm_window.h"
-#include "ash/public/cpp/shell_window_ids.h"
-#include "ash/root_window_controller.h"
-#include "base/command_line.h"
-#include "ui/accessibility/ax_node_data.h"
-#include "ui/compositor/scoped_layer_animation_settings.h"
-#include "ui/display/display.h"
-#include "ui/display/screen.h"
-#include "ui/gfx/canvas.h"
-#include "ui/views/background.h"
-#include "ui/views/border.h"
-#include "ui/views/controls/label.h"
-#include "ui/views/layout/box_layout.h"
-#include "ui/views/painter.h"
-#include "ui/views/view.h"
-#include "ui/views/widget/widget.h"
-#include "ui/views/widget/widget_delegate.h"
-#include "ui/wm/core/visibility_controller.h"
-
-namespace ash {
-
-namespace {
-
-bool g_disable_initial_delay = false;
-
-// Used for the highlight view and the shield (black background).
-constexpr float kBackgroundCornerRadius = 4.f;
-
-// This background paints a |Painter| but fills the view's layer's size rather
-// than the view's size.
-class LayerFillBackgroundPainter : public views::Background {
- public:
-  explicit LayerFillBackgroundPainter(std::unique_ptr<views::Painter> painter)
-      : painter_(std::move(painter)) {}
-
-  ~LayerFillBackgroundPainter() override {}
-
-  void Paint(gfx::Canvas* canvas, views::View* view) const override {
-    views::Painter::PaintPainterAt(canvas, painter_.get(),
-                                   gfx::Rect(view->layer()->size()));
-  }
-
- private:
-  std::unique_ptr<views::Painter> painter_;
-
-  DISALLOW_COPY_AND_ASSIGN(LayerFillBackgroundPainter);
-};
-
-}  // namespace
-
-// This view represents a single WmWindow by displaying a title and a thumbnail
-// of the window's contents.
-class WindowPreviewView : public views::View, public aura::WindowObserver {
- public:
-  explicit WindowPreviewView(WmWindow* window)
-      : window_title_(new views::Label),
-        preview_background_(new views::View),
-        mirror_view_(window->CreateViewWithRecreatedLayers().release()),
-        window_observer_(this) {
-    window_observer_.Add(window->aura_window());
-    window_title_->SetText(window->GetTitle());
-    window_title_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-    window_title_->SetEnabledColor(SK_ColorWHITE);
-    window_title_->SetAutoColorReadabilityEnabled(false);
-    // Background is not fully opaque, so subpixel rendering won't look good.
-    window_title_->SetSubpixelRenderingEnabled(false);
-    // The base font is 12pt (for English) so this comes out to 14pt.
-    const int kLabelSizeDelta = 2;
-    window_title_->SetFontList(
-        window_title_->font_list().DeriveWithSizeDelta(kLabelSizeDelta));
-    const int kAboveLabelPadding = 5;
-    const int kBelowLabelPadding = 10;
-    window_title_->SetBorder(
-        views::CreateEmptyBorder(kAboveLabelPadding, 0, kBelowLabelPadding, 0));
-    AddChildView(window_title_);
-
-    // Preview padding is black at 50% opacity.
-    preview_background_->set_background(
-        views::Background::CreateSolidBackground(
-            SkColorSetA(SK_ColorBLACK, 0xFF / 2)));
-    AddChildView(preview_background_);
-
-    AddChildView(mirror_view_);
-
-    SetFocusBehavior(FocusBehavior::ALWAYS);
-  }
-  ~WindowPreviewView() override {}
-
-  // views::View:
-  gfx::Size GetPreferredSize() const override {
-    gfx::Size size = GetSizeForPreviewArea();
-    size.Enlarge(0, window_title_->GetPreferredSize().height());
-    return size;
-  }
-
-  void Layout() override {
-    const gfx::Size preview_area_size = GetSizeForPreviewArea();
-    // The window title is positioned above the preview area.
-    window_title_->SetBounds(0, 0, width(),
-                             height() - preview_area_size.height());
-
-    gfx::Rect preview_area_bounds(preview_area_size);
-    preview_area_bounds.set_y(height() - preview_area_size.height());
-    mirror_view_->SetSize(GetMirrorViewScaledSize());
-    if (mirror_view_->size() == preview_area_size) {
-      // Padding is not needed, hide the background and set the mirror view
-      // to take up the entire preview area.
-      mirror_view_->SetPosition(preview_area_bounds.origin());
-      preview_background_->SetVisible(false);
-      return;
-    }
-
-    // Padding is needed, so show the background and set the mirror view to be
-    // centered within it.
-    preview_background_->SetBoundsRect(preview_area_bounds);
-    preview_background_->SetVisible(true);
-    preview_area_bounds.ClampToCenteredSize(mirror_view_->size());
-    mirror_view_->SetPosition(preview_area_bounds.origin());
-  }
-
-  void GetAccessibleNodeData(ui::AXNodeData* node_data) override {
-    node_data->role = ui::AX_ROLE_WINDOW;
-    node_data->SetName(window_title_->text());
-  }
-
-  // aura::WindowObserver:
-  void OnWindowDestroying(aura::Window* window) override {
-    window_observer_.Remove(window);
-  }
-
-  void OnWindowTitleChanged(aura::Window* window) override {
-    window_title_->SetText(window->GetTitle());
-  }
-
- private:
-  // The maximum width of a window preview.
-  static const int kMaxPreviewWidth = 512;
-  // All previews are the same height (this is achieved via a combination of
-  // scaling and padding).
-  static const int kFixedPreviewHeight = 256;
-
-  // Returns the size for the mirror view, scaled to fit within the max bounds.
-  // Scaling is always 1:1 and we only scale down, never up.
-  gfx::Size GetMirrorViewScaledSize() const {
-    gfx::Size mirror_pref_size = mirror_view_->GetPreferredSize();
-
-    if (mirror_pref_size.width() > kMaxPreviewWidth ||
-        mirror_pref_size.height() > kFixedPreviewHeight) {
-      float scale = std::min(
-          kMaxPreviewWidth / static_cast<float>(mirror_pref_size.width()),
-          kFixedPreviewHeight / static_cast<float>(mirror_pref_size.height()));
-      mirror_pref_size =
-          gfx::ScaleToFlooredSize(mirror_pref_size, scale, scale);
-    }
-
-    return mirror_pref_size;
-  }
-
-  // Returns the size for the entire preview area (mirror view and additional
-  // padding). All previews will be the same height, so if the mirror view isn't
-  // tall enough we will add top and bottom padding. Previews can range in width
-  // from kMaxPreviewWidth down to half that value. Again, padding will be added
-  // to the sides to achieve this if the preview is too narrow.
-  gfx::Size GetSizeForPreviewArea() const {
-    gfx::Size mirror_size = GetMirrorViewScaledSize();
-    float aspect_ratio =
-        static_cast<float>(mirror_size.width()) / mirror_size.height();
-    gfx::Size preview_size = mirror_size;
-    // Very narrow windows get vertical bars of padding on the sides.
-    if (aspect_ratio < 0.5f)
-      preview_size.set_width(mirror_size.height() / 2);
-
-    // All previews are the same height (this may add padding on top and
-    // bottom).
-    preview_size.set_height(kFixedPreviewHeight);
-    // Previews should never be narrower than half their max width (128dip).
-    preview_size.set_width(
-        std::max(preview_size.width(), kMaxPreviewWidth / 2));
-
-    return preview_size;
-  }
-
-  // Displays the title of the window above the preview.
-  views::Label* window_title_;
-  // When visible, shows a darkened background area behind |mirror_view_|
-  // (effectively padding the preview to fit the desired bounds).
-  views::View* preview_background_;
-  // The view that actually renders a thumbnail version of the window.
-  views::View* mirror_view_;
-
-  ScopedObserver<aura::Window, aura::WindowObserver> window_observer_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowPreviewView);
-};
-
-// A view that shows a collection of windows the user can tab through.
-class WindowCycleView : public views::WidgetDelegateView {
- public:
-  explicit WindowCycleView(const WindowCycleList::WindowList& windows)
-      : mirror_container_(new views::View()),
-        highlight_view_(new views::View()),
-        target_window_(nullptr) {
-    DCHECK(!windows.empty());
-    SetPaintToLayer();
-    layer()->SetFillsBoundsOpaquely(false);
-    layer()->SetMasksToBounds(true);
-    layer()->SetOpacity(0.0);
-    {
-      ui::ScopedLayerAnimationSettings animate_fade(layer()->GetAnimator());
-      animate_fade.SetTransitionDuration(
-          base::TimeDelta::FromMilliseconds(100));
-      layer()->SetOpacity(1.0);
-    }
-
-    const int kInsideBorderPaddingDip = 64;
-    const int kBetweenChildPaddingDip = 10;
-    views::BoxLayout* layout = new views::BoxLayout(
-        views::BoxLayout::kHorizontal, kInsideBorderPaddingDip,
-        kInsideBorderPaddingDip, kBetweenChildPaddingDip);
-    layout->set_cross_axis_alignment(
-        views::BoxLayout::CROSS_AXIS_ALIGNMENT_START);
-    mirror_container_->SetLayoutManager(layout);
-    mirror_container_->SetPaintToLayer();
-    mirror_container_->layer()->SetFillsBoundsOpaquely(false);
-
-    for (WmWindow* window : windows) {
-      // |mirror_container_| owns |view|.
-      views::View* view = new WindowPreviewView(window);
-      window_view_map_[window] = view;
-      mirror_container_->AddChildView(view);
-    }
-
-    // The background needs to be painted to fill the layer, not the View,
-    // because the layer animates bounds changes but the View's bounds change
-    // immediately.
-    highlight_view_->set_background(new LayerFillBackgroundPainter(
-        views::Painter::CreateRoundRectWith1PxBorderPainter(
-            SkColorSetA(SK_ColorWHITE, 0x4D), SkColorSetA(SK_ColorWHITE, 0x33),
-            kBackgroundCornerRadius)));
-    highlight_view_->SetPaintToLayer();
-
-    highlight_view_->layer()->SetFillsBoundsOpaquely(false);
-
-    AddChildView(highlight_view_);
-    AddChildView(mirror_container_);
-  }
-
-  ~WindowCycleView() override {}
-
-  void SetTargetWindow(WmWindow* target) {
-    target_window_ = target;
-    if (GetWidget()) {
-      Layout();
-      if (target_window_)
-        window_view_map_[target_window_]->RequestFocus();
-    }
-  }
-
-  void HandleWindowDestruction(WmWindow* destroying_window,
-                               WmWindow* new_target) {
-    auto view_iter = window_view_map_.find(destroying_window);
-    views::View* preview = view_iter->second;
-    views::View* parent = preview->parent();
-    DCHECK_EQ(mirror_container_, parent);
-    window_view_map_.erase(view_iter);
-    delete preview;
-    // With one of its children now gone, we must re-layout |mirror_container_|.
-    // This must happen before SetTargetWindow() to make sure our own Layout()
-    // works correctly when it's calculating highlight bounds.
-    parent->Layout();
-    SetTargetWindow(new_target);
-  }
-
-  void DestroyContents() {
-    window_view_map_.clear();
-    RemoveAllChildViews(true);
-  }
-
-  // views::WidgetDelegateView overrides:
-  gfx::Size GetPreferredSize() const override {
-    return mirror_container_->GetPreferredSize();
-  }
-
-  void Layout() override {
-    if (!target_window_ || bounds().IsEmpty())
-      return;
-
-    bool first_layout = mirror_container_->bounds().IsEmpty();
-    // If |mirror_container_| has not yet been laid out, we must lay it and its
-    // descendants out so that the calculations based on |target_view| work
-    // properly.
-    if (first_layout)
-      mirror_container_->SizeToPreferredSize();
-
-    views::View* target_view = window_view_map_[target_window_];
-    gfx::RectF target_bounds(target_view->GetLocalBounds());
-    views::View::ConvertRectToTarget(target_view, mirror_container_,
-                                     &target_bounds);
-    gfx::Rect container_bounds(mirror_container_->GetPreferredSize());
-    // Case one: the container is narrower than the screen. Center the
-    // container.
-    int x_offset = (width() - container_bounds.width()) / 2;
-    if (x_offset < 0) {
-      // Case two: the container is wider than the screen. Center the target
-      // view by moving the list just enough to ensure the target view is in the
-      // center.
-      x_offset = width() / 2 -
-                 mirror_container_->GetMirroredXInView(
-                     target_bounds.CenterPoint().x());
-
-      // However, the container must span the screen, i.e. the maximum x is 0
-      // and the minimum for its right boundary is the width of the screen.
-      x_offset = std::min(x_offset, 0);
-      x_offset = std::max(x_offset, width() - container_bounds.width());
-    }
-    container_bounds.set_x(x_offset);
-    mirror_container_->SetBoundsRect(container_bounds);
-
-    // Calculate the target preview's bounds relative to |this|.
-    views::View::ConvertRectToTarget(mirror_container_, this, &target_bounds);
-    const int kHighlightPaddingDip = 5;
-    target_bounds.Inset(gfx::InsetsF(-kHighlightPaddingDip));
-    target_bounds.set_x(
-        GetMirroredXWithWidthInView(target_bounds.x(), target_bounds.width()));
-    highlight_view_->SetBoundsRect(gfx::ToEnclosingRect(target_bounds));
-
-    // Enable animations only after the first Layout() pass.
-    if (first_layout) {
-      // The preview list animates bounds changes (other animatable properties
-      // never change).
-      mirror_container_->layer()->SetAnimator(
-          ui::LayerAnimator::CreateImplicitAnimator());
-      // The selection highlight also animates all bounds changes and never
-      // changes other animatable properties.
-      highlight_view_->layer()->SetAnimator(
-          ui::LayerAnimator::CreateImplicitAnimator());
-    }
-  }
-
-  void OnPaintBackground(gfx::Canvas* canvas) override {
-    // We can't set a bg on the mirror container itself because the highlight
-    // view needs to be on top of the bg but behind the target windows.
-    const gfx::RectF shield_bounds(mirror_container_->bounds());
-    cc::PaintFlags flags;
-    flags.setColor(SkColorSetA(SK_ColorBLACK, 0xE6));
-    flags.setStyle(cc::PaintFlags::kFill_Style);
-    float corner_radius = 0.f;
-    if (shield_bounds.width() < width()) {
-      flags.setAntiAlias(true);
-      corner_radius = kBackgroundCornerRadius;
-    }
-    canvas->DrawRoundRect(shield_bounds, corner_radius, flags);
-  }
-
-  View* GetInitiallyFocusedView() override {
-    return window_view_map_[target_window_];
-  }
-
-  WmWindow* target_window() { return target_window_; }
-
- private:
-  std::map<WmWindow*, views::View*> window_view_map_;
-  views::View* mirror_container_;
-  views::View* highlight_view_;
-  WmWindow* target_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowCycleView);
-};
-
-WindowCycleList::WindowCycleList(const WindowList& windows)
-    : windows_(windows),
-      screen_observer_(this) {
-  if (!ShouldShowUi())
-    WmShell::Get()->mru_window_tracker()->SetIgnoreActivations(true);
-
-  for (WmWindow* window : windows_)
-    window->aura_window()->AddObserver(this);
-
-  if (ShouldShowUi()) {
-    if (g_disable_initial_delay) {
-      InitWindowCycleView();
-    } else {
-      show_ui_timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(150),
-                           this, &WindowCycleList::InitWindowCycleView);
-    }
-  }
-}
-
-WindowCycleList::~WindowCycleList() {
-  if (!ShouldShowUi())
-    WmShell::Get()->mru_window_tracker()->SetIgnoreActivations(false);
-
-  for (WmWindow* window : windows_)
-    window->aura_window()->RemoveObserver(this);
-
-  if (!windows_.empty() && user_did_accept_) {
-    WmWindow* target_window = windows_[current_index_];
-    target_window->Show();
-    target_window->GetWindowState()->Activate();
-  }
-
-  if (cycle_ui_widget_)
-    cycle_ui_widget_->Close();
-
-  // |this| is responsible for notifying |cycle_view_| when windows are
-  // destroyed. Since |this| is going away, clobber |cycle_view_|. Otherwise
-  // there will be a race where a window closes after now but before the
-  // Widget::Close() call above actually destroys |cycle_view_|. See
-  // crbug.com/681207
-  if (cycle_view_)
-    cycle_view_->DestroyContents();
-}
-
-void WindowCycleList::Step(WindowCycleController::Direction direction) {
-  if (windows_.empty())
-    return;
-
-  // When there is only one window, we should give feedback to the user. If the
-  // window is minimized, we should also show it.
-  if (windows_.size() == 1) {
-    windows_[0]->Animate(::wm::WINDOW_ANIMATION_TYPE_BOUNCE);
-    windows_[0]->Show();
-    windows_[0]->GetWindowState()->Activate();
-    return;
-  }
-
-  DCHECK(static_cast<size_t>(current_index_) < windows_.size());
-
-  if (!cycle_view_ && current_index_ == 0) {
-    // Special case the situation where we're cycling forward but the MRU window
-    // is not active. This occurs when all windows are minimized. The starting
-    // window should be the first one rather than the second.
-    if (direction == WindowCycleController::FORWARD && !windows_[0]->IsActive())
-      current_index_ = -1;
-  }
-
-  // We're in a valid cycle, so step forward or backward.
-  current_index_ += direction == WindowCycleController::FORWARD ? 1 : -1;
-
-  // Wrap to window list size.
-  current_index_ = (current_index_ + windows_.size()) % windows_.size();
-  DCHECK(windows_[current_index_]);
-
-  if (ShouldShowUi()) {
-    if (current_index_ > 1)
-      InitWindowCycleView();
-
-    if (cycle_view_)
-      cycle_view_->SetTargetWindow(windows_[current_index_]);
-  }
-}
-
-// static
-void WindowCycleList::DisableInitialDelayForTesting() {
-  g_disable_initial_delay = true;
-}
-
-void WindowCycleList::OnWindowDestroying(aura::Window* window) {
-  window->RemoveObserver(this);
-
-  WindowList::iterator i =
-      std::find(windows_.begin(), windows_.end(), WmWindow::Get(window));
-  // TODO(oshima): Change this back to DCHECK once crbug.com/483491 is fixed.
-  CHECK(i != windows_.end());
-  int removed_index = static_cast<int>(i - windows_.begin());
-  windows_.erase(i);
-  if (current_index_ > removed_index ||
-      current_index_ == static_cast<int>(windows_.size())) {
-    current_index_--;
-  }
-
-  if (cycle_view_) {
-    WmWindow* new_target_window =
-        windows_.empty() ? nullptr : windows_[current_index_];
-    cycle_view_->HandleWindowDestruction(WmWindow::Get(window),
-                                         new_target_window);
-    if (windows_.empty()) {
-      // This deletes us.
-      WmShell::Get()->window_cycle_controller()->CancelCycling();
-      return;
-    }
-  }
-}
-
-void WindowCycleList::OnDisplayAdded(const display::Display& new_display) {}
-
-void WindowCycleList::OnDisplayRemoved(const display::Display& old_display) {}
-
-void WindowCycleList::OnDisplayMetricsChanged(const display::Display& display,
-                                              uint32_t changed_metrics) {
-  if (cycle_ui_widget_ &&
-      display.id() ==
-          display::Screen::GetScreen()
-              ->GetDisplayNearestWindow(cycle_ui_widget_->GetNativeView())
-              .id() &&
-      (changed_metrics & (DISPLAY_METRIC_BOUNDS | DISPLAY_METRIC_ROTATION))) {
-    WmShell::Get()->window_cycle_controller()->CancelCycling();
-    // |this| is deleted.
-    return;
-  }
-}
-
-bool WindowCycleList::ShouldShowUi() {
-  return windows_.size() > 1;
-}
-
-void WindowCycleList::InitWindowCycleView() {
-  if (cycle_view_)
-    return;
-
-  cycle_view_ = new WindowCycleView(windows_);
-  cycle_view_->SetTargetWindow(windows_[current_index_]);
-
-  views::Widget* widget = new views::Widget;
-  views::Widget::InitParams params;
-  params.delegate = cycle_view_;
-  params.type = views::Widget::InitParams::TYPE_WINDOW_FRAMELESS;
-  params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
-  params.accept_events = true;
-  params.name = "WindowCycleList (Alt+Tab)";
-  // TODO(estade): make sure nothing untoward happens when the lock screen
-  // or a system modal dialog is shown.
-  WmWindow* root_window = WmShell::Get()->GetRootWindowForNewWindows();
-  root_window->GetRootWindowController()->ConfigureWidgetInitParamsForContainer(
-      widget, kShellWindowId_OverlayContainer, &params);
-  gfx::Rect widget_rect = root_window->GetDisplayNearestWindow().bounds();
-  const int widget_height = cycle_view_->GetPreferredSize().height();
-  widget_rect.set_y(widget_rect.y() +
-                    (widget_rect.height() - widget_height) / 2);
-  widget_rect.set_height(widget_height);
-  params.bounds = widget_rect;
-  widget->Init(params);
-
-  screen_observer_.Add(display::Screen::GetScreen());
-  widget->Show();
-  cycle_ui_widget_ = widget;
-}
-
-}  // namespace ash