src/ash/wm/overview/scoped_transform_overview_window.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/wm/overview/scoped_transform_overview_window.h"
   6
   7 #include "ash/screen_util.h"
   8 #include "ash/shell_window_ids.h"
   9 #include "ash/wm/overview/scoped_window_copy.h"
  10 #include "ash/wm/overview/window_selector_item.h"
  11 #include "ash/wm/window_state.h"
  12 #include "ash/wm/window_util.h"
  13 #include "ui/aura/client/aura_constants.h"
  14 #include "ui/aura/client/screen_position_client.h"
  15 #include "ui/aura/window.h"
  16 #include "ui/compositor/scoped_layer_animation_settings.h"
  17 #include "ui/gfx/animation/tween.h"
  18 #include "ui/views/widget/widget.h"
  19 #include "ui/wm/core/window_animations.h"
  20 #include "ui/wm/core/window_util.h"
  21
  22 namespace ash {
  23
  24 namespace {
  25
  26 // The animation settings used for window selector animations.
  27 class WindowSelectorAnimationSettings
  28     : public ui::ScopedLayerAnimationSettings {
  29  public:
  30   WindowSelectorAnimationSettings(aura::Window* window) :
  31       ui::ScopedLayerAnimationSettings(window->layer()->GetAnimator()) {
  32     SetPreemptionStrategy(
  33         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
  34     SetTransitionDuration(base::TimeDelta::FromMilliseconds(
  35         ScopedTransformOverviewWindow::kTransitionMilliseconds));
  36     SetTweenType(gfx::Tween::FAST_OUT_SLOW_IN);
  37   }
  38
  39   virtual ~WindowSelectorAnimationSettings() {
  40   }
  41 };
  42
  43 void SetTransformOnWindow(aura::Window* window,
  44                           const gfx::Transform& transform,
  45                           bool animate) {
  46   if (animate) {
  47     WindowSelectorAnimationSettings animation_settings(window);
  48     window->SetTransform(transform);
  49   } else {
  50     window->SetTransform(transform);
  51   }
  52 }
  53
  54 gfx::Transform TranslateTransformOrigin(const gfx::Vector2d& new_origin,
  55                                         const gfx::Transform& transform) {
  56   gfx::Transform result;
  57   result.Translate(-new_origin.x(), -new_origin.y());
  58   result.PreconcatTransform(transform);
  59   result.Translate(new_origin.x(), new_origin.y());
  60   return result;
  61 }
  62
  63 void SetTransformOnWindowAndAllTransientChildren(
  64     aura::Window* window,
  65     const gfx::Transform& transform,
  66     bool animate) {
  67   SetTransformOnWindow(window, transform, animate);
  68
  69   aura::Window::Windows transient_children =
  70       ::wm::GetTransientChildren(window);
  71   for (aura::Window::Windows::iterator iter = transient_children.begin();
  72        iter != transient_children.end(); ++iter) {
  73     aura::Window* transient_child = *iter;
  74     gfx::Rect window_bounds = window->bounds();
  75     gfx::Rect child_bounds = transient_child->bounds();
  76     gfx::Transform transient_window_transform(
  77         TranslateTransformOrigin(child_bounds.origin() - window_bounds.origin(),
  78                                  transform));
  79     SetTransformOnWindow(transient_child, transient_window_transform, animate);
  80   }
  81 }
  82
  83 aura::Window* GetModalTransientParent(aura::Window* window) {
  84   if (window->GetProperty(aura::client::kModalKey) == ui::MODAL_TYPE_WINDOW)
  85     return ::wm::GetTransientParent(window);
  86   return NULL;
  87 }
  88
  89 }  // namespace
  90
  91 const int ScopedTransformOverviewWindow::kTransitionMilliseconds = 200;
  92
  93 ScopedTransformOverviewWindow::ScopedTransformOverviewWindow(
  94         aura::Window* window)
  95     : window_(window),
  96       minimized_(window->GetProperty(aura::client::kShowStateKey) ==
  97                  ui::SHOW_STATE_MINIMIZED),
  98       ignored_by_shelf_(ash::wm::GetWindowState(window)->ignored_by_shelf()),
  99       overview_started_(false),
 100       original_transform_(window->layer()->GetTargetTransform()),
 101       opacity_(window->layer()->GetTargetOpacity()) {
 102 }
 103
 104 ScopedTransformOverviewWindow::~ScopedTransformOverviewWindow() {
 105   if (window_) {
 106     WindowSelectorAnimationSettings animation_settings(window_);
 107     gfx::Transform transform;
 108     SetTransformOnWindowAndTransientChildren(original_transform_, true);
 109     if (minimized_ && window_->GetProperty(aura::client::kShowStateKey) !=
 110         ui::SHOW_STATE_MINIMIZED) {
 111       // Setting opacity 0 and visible false ensures that the property change
 112       // to SHOW_STATE_MINIMIZED will not animate the window from its original
 113       // bounds to the minimized position.
 114       // Hiding the window needs to be done before the target opacity is 0,
 115       // otherwise the layer's visibility will not be updated
 116       // (See VisibilityController::UpdateLayerVisibility).
 117       window_->Hide();
 118       window_->layer()->SetOpacity(0);
 119       window_->SetProperty(aura::client::kShowStateKey,
 120                            ui::SHOW_STATE_MINIMIZED);
 121     }
 122     ash::wm::GetWindowState(window_)->set_ignored_by_shelf(ignored_by_shelf_);
 123     window_->layer()->SetOpacity(opacity_);
 124   }
 125 }
 126
 127 bool ScopedTransformOverviewWindow::Contains(const aura::Window* target) const {
 128   for (ScopedVector<ScopedWindowCopy>::const_iterator iter =
 129       window_copies_.begin(); iter != window_copies_.end(); ++iter) {
 130     if ((*iter)->GetWindow()->Contains(target))
 131       return true;
 132   }
 133   aura::Window* window = window_;
 134   while (window) {
 135     if (window->Contains(target))
 136       return true;
 137     window = GetModalTransientParent(window);
 138   }
 139   return false;
 140 }
 141
 142 gfx::Rect ScopedTransformOverviewWindow::GetBoundsInScreen() const {
 143   gfx::Rect bounds;
 144   aura::Window* window = window_;
 145   while (window) {
 146     bounds.Union(ScreenUtil::ConvertRectToScreen(window->parent(),
 147                                                 window->GetTargetBounds()));
 148     window = GetModalTransientParent(window);
 149   }
 150   return bounds;
 151 }
 152
 153 void ScopedTransformOverviewWindow::RestoreWindow() {
 154   if (minimized_ && window_->GetProperty(aura::client::kShowStateKey) ==
 155       ui::SHOW_STATE_MINIMIZED) {
 156     window_->Show();
 157   }
 158 }
 159
 160 void ScopedTransformOverviewWindow::RestoreWindowOnExit() {
 161   minimized_ = false;
 162   original_transform_ = gfx::Transform();
 163   opacity_ = 1;
 164 }
 165
 166 void ScopedTransformOverviewWindow::OnWindowDestroyed() {
 167   window_ = NULL;
 168 }
 169
 170 gfx::Rect ScopedTransformOverviewWindow::ShrinkRectToFitPreservingAspectRatio(
 171     const gfx::Rect& rect,
 172     const gfx::Rect& bounds) {
 173   DCHECK(!rect.IsEmpty());
 174   DCHECK(!bounds.IsEmpty());
 175   float scale = std::min(1.0f,
 176       std::min(static_cast<float>(bounds.width()) / rect.width(),
 177                static_cast<float>(bounds.height()) / rect.height()));
 178   return gfx::Rect(bounds.x() + 0.5 * (bounds.width() - scale * rect.width()),
 179                    bounds.y() + 0.5 * (bounds.height() - scale * rect.height()),
 180                    rect.width() * scale,
 181                    rect.height() * scale);
 182 }
 183
 184 gfx::Transform ScopedTransformOverviewWindow::GetTransformForRect(
 185     const gfx::Rect& src_rect,
 186     const gfx::Rect& dst_rect) {
 187   DCHECK(!src_rect.IsEmpty());
 188   DCHECK(!dst_rect.IsEmpty());
 189   gfx::Transform transform;
 190   transform.Translate(dst_rect.x() - src_rect.x(),
 191                       dst_rect.y() - src_rect.y());
 192   transform.Scale(static_cast<float>(dst_rect.width()) / src_rect.width(),
 193                   static_cast<float>(dst_rect.height()) / src_rect.height());
 194   return transform;
 195 }
 196
 197 void ScopedTransformOverviewWindow::SetTransform(
 198     aura::Window* root_window,
 199     const gfx::Transform& transform,
 200     bool animate) {
 201   DCHECK(overview_started_);
 202
 203   if (root_window != window_->GetRootWindow()) {
 204     if (!window_copies_.empty()) {
 205       bool bounds_or_hierarchy_changed = false;
 206       aura::Window* window = window_;
 207       for (ScopedVector<ScopedWindowCopy>::reverse_iterator iter =
 208                window_copies_.rbegin();
 209            !bounds_or_hierarchy_changed && iter != window_copies_.rend();
 210            ++iter, window = GetModalTransientParent(window)) {
 211         if (!window) {
 212           bounds_or_hierarchy_changed = true;
 213         } else if ((*iter)->GetWindow()->GetBoundsInScreen() !=
 214                 window->GetBoundsInScreen()) {
 215           bounds_or_hierarchy_changed = true;
 216         }
 217       }
 218       // Clearing the window copies array will force it to be recreated.
 219       // TODO(flackr): If only the position changed and not the size,
 220       // update the existing window copy's position and continue to use it.
 221       if (bounds_or_hierarchy_changed)
 222         window_copies_.clear();
 223     }
 224     if (window_copies_.empty()) {
 225       // TODO(flackr): Create copies of the transient children windows as well.
 226       // Currently they will only be visible on the window's initial display.
 227       CopyWindowAndTransientParents(root_window, window_);
 228     }
 229   }
 230   SetTransformOnWindowAndTransientChildren(transform, animate);
 231 }
 232
 233 void ScopedTransformOverviewWindow::CopyWindowAndTransientParents(
 234     aura::Window* target_root,
 235     aura::Window* window) {
 236   aura::Window* modal_parent = GetModalTransientParent(window);
 237   if (modal_parent)
 238     CopyWindowAndTransientParents(target_root, modal_parent);
 239   window_copies_.push_back(new ScopedWindowCopy(target_root, window));
 240 }
 241
 242 void ScopedTransformOverviewWindow::SetTransformOnWindowAndTransientChildren(
 243     const gfx::Transform& transform,
 244     bool animate) {
 245   gfx::Point origin(GetBoundsInScreen().origin());
 246   aura::Window* window = window_;
 247   while (::wm::GetTransientParent(window))
 248     window = ::wm::GetTransientParent(window);
 249   for (ScopedVector<ScopedWindowCopy>::const_iterator iter =
 250       window_copies_.begin(); iter != window_copies_.end(); ++iter) {
 251     SetTransformOnWindow(
 252         (*iter)->GetWindow(),
 253         TranslateTransformOrigin(ScreenUtil::ConvertRectToScreen(
 254             (*iter)->GetWindow()->parent(),
 255             (*iter)->GetWindow()->GetTargetBounds()).origin() - origin,
 256             transform),
 257         animate);
 258   }
 259   SetTransformOnWindowAndAllTransientChildren(
 260       window,
 261       TranslateTransformOrigin(ScreenUtil::ConvertRectToScreen(
 262           window->parent(), window->GetTargetBounds()).origin() - origin,
 263           transform),
 264       animate);
 265 }
 266
 267 void ScopedTransformOverviewWindow::PrepareForOverview() {
 268   DCHECK(!overview_started_);
 269   overview_started_ = true;
 270   ash::wm::GetWindowState(window_)->set_ignored_by_shelf(true);
 271   RestoreWindow();
 272 }
 273
 274 }  // namespace ash