Torne (Richard Coles) | 46d4c2b | 2014-06-09 12:00:27 +0100 | [diff] [blame] | 1 | // Copyright 2014 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/window_grid.h" |
| 6 | |
| 7 | #include "ash/screen_util.h" |
| 8 | #include "ash/shell.h" |
| 9 | #include "ash/shell_window_ids.h" |
| 10 | #include "ash/wm/overview/scoped_transform_overview_window.h" |
| 11 | #include "ash/wm/overview/window_selector.h" |
| 12 | #include "ash/wm/overview/window_selector_item.h" |
| 13 | #include "ash/wm/overview/window_selector_panels.h" |
| 14 | #include "ash/wm/overview/window_selector_window.h" |
| 15 | #include "ash/wm/window_state.h" |
| 16 | #include "base/memory/scoped_vector.h" |
| 17 | #include "third_party/skia/include/core/SkColor.h" |
| 18 | #include "ui/aura/window.h" |
| 19 | #include "ui/compositor/layer_animation_observer.h" |
| 20 | #include "ui/compositor/scoped_layer_animation_settings.h" |
| 21 | #include "ui/gfx/animation/tween.h" |
| 22 | #include "ui/gfx/vector2d.h" |
| 23 | #include "ui/views/background.h" |
| 24 | #include "ui/views/view.h" |
| 25 | #include "ui/views/widget/widget.h" |
| 26 | #include "ui/wm/core/window_animations.h" |
| 27 | |
| 28 | namespace ash { |
| 29 | namespace { |
| 30 | |
| 31 | // An observer which holds onto the passed widget until the animation is |
| 32 | // complete. |
| 33 | class CleanupWidgetAfterAnimationObserver |
| 34 | : public ui::ImplicitAnimationObserver { |
| 35 | public: |
| 36 | explicit CleanupWidgetAfterAnimationObserver( |
| 37 | scoped_ptr<views::Widget> widget); |
| 38 | virtual ~CleanupWidgetAfterAnimationObserver(); |
| 39 | |
| 40 | // ui::ImplicitAnimationObserver: |
| 41 | virtual void OnImplicitAnimationsCompleted() OVERRIDE; |
| 42 | |
| 43 | private: |
| 44 | scoped_ptr<views::Widget> widget_; |
| 45 | |
| 46 | DISALLOW_COPY_AND_ASSIGN(CleanupWidgetAfterAnimationObserver); |
| 47 | }; |
| 48 | |
| 49 | CleanupWidgetAfterAnimationObserver::CleanupWidgetAfterAnimationObserver( |
| 50 | scoped_ptr<views::Widget> widget) |
| 51 | : widget_(widget.Pass()) { |
| 52 | } |
| 53 | |
| 54 | CleanupWidgetAfterAnimationObserver::~CleanupWidgetAfterAnimationObserver() { |
| 55 | } |
| 56 | |
| 57 | void CleanupWidgetAfterAnimationObserver::OnImplicitAnimationsCompleted() { |
| 58 | delete this; |
| 59 | } |
| 60 | |
| 61 | // A comparator for locating a given target window. |
| 62 | struct WindowSelectorItemComparator |
| 63 | : public std::unary_function<WindowSelectorItem*, bool> { |
| 64 | explicit WindowSelectorItemComparator(const aura::Window* target_window) |
| 65 | : target(target_window) { |
| 66 | } |
| 67 | |
| 68 | bool operator()(WindowSelectorItem* window) const { |
| 69 | return window->HasSelectableWindow(target); |
| 70 | } |
| 71 | |
| 72 | const aura::Window* target; |
| 73 | }; |
| 74 | |
| 75 | // A comparator for locating a WindowSelectorItem given a targeted window. |
| 76 | struct WindowSelectorItemTargetComparator |
| 77 | : public std::unary_function<WindowSelectorItem*, bool> { |
| 78 | explicit WindowSelectorItemTargetComparator(const aura::Window* target_window) |
| 79 | : target(target_window) { |
| 80 | } |
| 81 | |
| 82 | bool operator()(WindowSelectorItem* window) const { |
| 83 | return window->Contains(target); |
| 84 | } |
| 85 | |
| 86 | const aura::Window* target; |
| 87 | }; |
| 88 | |
| 89 | // Conceptually the window overview is a table or grid of cells having this |
| 90 | // fixed aspect ratio. The number of columns is determined by maximizing the |
| 91 | // area of them based on the number of window_list. |
| 92 | const float kCardAspectRatio = 4.0f / 3.0f; |
| 93 | |
| 94 | // The minimum number of cards along the major axis (i.e. horizontally on a |
| 95 | // landscape orientation). |
| 96 | const int kMinCardsMajor = 3; |
| 97 | |
| 98 | const int kOverviewSelectorTransitionMilliseconds = 100; |
| 99 | |
| 100 | // The color and opacity of the overview selector. |
| 101 | const SkColor kWindowOverviewSelectionColor = SK_ColorBLACK; |
| 102 | const unsigned char kWindowOverviewSelectorOpacity = 128; |
| 103 | |
| 104 | // Returns the vector for the fade in animation. |
| 105 | gfx::Vector2d GetSlideVectorForFadeIn(WindowSelector::Direction direction, |
| 106 | const gfx::Rect& bounds) { |
| 107 | gfx::Vector2d vector; |
| 108 | switch (direction) { |
| 109 | case WindowSelector::DOWN: |
| 110 | vector.set_y(bounds.width()); |
| 111 | break; |
| 112 | case WindowSelector::RIGHT: |
| 113 | vector.set_x(bounds.height()); |
| 114 | break; |
| 115 | case WindowSelector::UP: |
| 116 | vector.set_y(-bounds.width()); |
| 117 | break; |
| 118 | case WindowSelector::LEFT: |
| 119 | vector.set_x(-bounds.height()); |
| 120 | break; |
| 121 | } |
| 122 | return vector; |
| 123 | } |
| 124 | |
| 125 | } // namespace |
| 126 | |
| 127 | WindowGrid::WindowGrid(aura::Window* root_window, |
| 128 | const std::vector<aura::Window*>& windows, |
| 129 | WindowSelector* window_selector) |
| 130 | : root_window_(root_window), |
| 131 | window_selector_(window_selector) { |
| 132 | WindowSelectorPanels* panels_item = NULL; |
| 133 | for (aura::Window::Windows::const_iterator iter = windows.begin(); |
| 134 | iter != windows.end(); ++iter) { |
| 135 | if ((*iter)->GetRootWindow() != root_window) |
| 136 | continue; |
| 137 | (*iter)->AddObserver(this); |
| 138 | observed_windows_.insert(*iter); |
| 139 | WindowSelectorItem* item = NULL; |
| 140 | |
| 141 | if ((*iter)->type() == ui::wm::WINDOW_TYPE_PANEL && |
| 142 | wm::GetWindowState(*iter)->panel_attached()) { |
| 143 | // Attached panel windows are grouped into a single overview item per |
| 144 | // grid. |
| 145 | if (!panels_item) { |
Torne (Richard Coles) | f8ee788 | 2014-06-20 14:52:04 +0100 | [diff] [blame^] | 146 | panels_item = new WindowSelectorPanels(root_window_); |
Torne (Richard Coles) | 46d4c2b | 2014-06-09 12:00:27 +0100 | [diff] [blame] | 147 | window_list_.push_back(panels_item); |
| 148 | } |
| 149 | panels_item->AddWindow(*iter); |
| 150 | item = panels_item; |
| 151 | } else { |
| 152 | item = new WindowSelectorWindow(*iter); |
| 153 | item->PrepareForOverview(); |
| 154 | window_list_.push_back(item); |
| 155 | } |
| 156 | } |
| 157 | if (window_list_.empty()) |
| 158 | return; |
| 159 | |
| 160 | if (panels_item) |
| 161 | panels_item->PrepareForOverview(); |
| 162 | |
| 163 | PositionWindows(true); |
| 164 | } |
| 165 | |
| 166 | WindowGrid::~WindowGrid() { |
| 167 | for (std::set<aura::Window*>::iterator iter = observed_windows_.begin(); |
| 168 | iter != observed_windows_.end(); iter++) { |
| 169 | (*iter)->RemoveObserver(this); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | void WindowGrid::PositionWindows(bool animate) { |
| 174 | CHECK(!window_list_.empty()); |
| 175 | |
| 176 | gfx::Size window_size; |
| 177 | gfx::Rect total_bounds = ScreenUtil::ConvertRectToScreen( |
| 178 | root_window_, |
| 179 | ScreenUtil::GetDisplayWorkAreaBoundsInParent( |
| 180 | Shell::GetContainer(root_window_, kShellWindowId_DefaultContainer))); |
| 181 | |
| 182 | // Find the minimum number of windows per row that will fit all of the |
| 183 | // windows on screen. |
| 184 | num_columns_ = std::max( |
| 185 | total_bounds.width() > total_bounds.height() ? kMinCardsMajor : 1, |
| 186 | static_cast<int>(ceil(sqrt(total_bounds.width() * window_list_.size() / |
| 187 | (kCardAspectRatio * total_bounds.height()))))); |
| 188 | int num_rows = ((window_list_.size() + num_columns_ - 1) / num_columns_); |
| 189 | window_size.set_width(std::min( |
| 190 | static_cast<int>(total_bounds.width() / num_columns_), |
| 191 | static_cast<int>(total_bounds.height() * kCardAspectRatio / num_rows))); |
| 192 | window_size.set_height(window_size.width() / kCardAspectRatio); |
| 193 | |
| 194 | // Calculate the X and Y offsets necessary to center the grid. |
| 195 | int x_offset = total_bounds.x() + ((window_list_.size() >= num_columns_ ? 0 : |
| 196 | (num_columns_ - window_list_.size()) * window_size.width()) + |
| 197 | (total_bounds.width() - num_columns_ * window_size.width())) / 2; |
| 198 | int y_offset = total_bounds.y() + (total_bounds.height() - |
| 199 | num_rows * window_size.height()) / 2; |
| 200 | for (size_t i = 0; i < window_list_.size(); ++i) { |
| 201 | gfx::Transform transform; |
| 202 | int column = i % num_columns_; |
| 203 | int row = i / num_columns_; |
| 204 | gfx::Rect target_bounds(window_size.width() * column + x_offset, |
| 205 | window_size.height() * row + y_offset, |
| 206 | window_size.width(), |
| 207 | window_size.height()); |
| 208 | window_list_[i]->SetBounds(root_window_, target_bounds, animate); |
| 209 | } |
| 210 | |
| 211 | // If we have less than |kMinCardsMajor| windows, adjust the column_ value to |
| 212 | // reflect how many "real" columns we have. |
| 213 | if (num_columns_ > window_list_.size()) |
| 214 | num_columns_ = window_list_.size(); |
| 215 | |
| 216 | // If the selection widget is active, reposition it without any animation. |
| 217 | if (selection_widget_) |
| 218 | MoveSelectionWidgetToTarget(animate); |
| 219 | } |
| 220 | |
| 221 | bool WindowGrid::Move(WindowSelector::Direction direction) { |
| 222 | bool recreate_selection_widget = false; |
| 223 | bool out_of_bounds = false; |
| 224 | if (!selection_widget_) { |
| 225 | switch (direction) { |
| 226 | case WindowSelector::LEFT: |
| 227 | selected_index_ = window_list_.size() - 1; |
| 228 | break; |
| 229 | case WindowSelector::UP: |
| 230 | selected_index_ = |
| 231 | (window_list_.size() / num_columns_) * num_columns_ - 1; |
| 232 | break; |
| 233 | case WindowSelector::RIGHT: |
| 234 | case WindowSelector::DOWN: |
| 235 | selected_index_ = 0; |
| 236 | break; |
| 237 | } |
| 238 | } else { |
| 239 | switch (direction) { |
| 240 | case WindowSelector::RIGHT: |
| 241 | if (selected_index_ >= window_list_.size() - 1) |
| 242 | out_of_bounds = true; |
| 243 | selected_index_++; |
| 244 | if (selected_index_ % num_columns_ == 0) |
| 245 | recreate_selection_widget = true; |
| 246 | break; |
| 247 | case WindowSelector::LEFT: |
| 248 | if (selected_index_ == 0) |
| 249 | out_of_bounds = true; |
| 250 | selected_index_--; |
| 251 | if ((selected_index_ + 1) % num_columns_ == 0) |
| 252 | recreate_selection_widget = true; |
| 253 | break; |
| 254 | case WindowSelector::DOWN: |
| 255 | selected_index_ += num_columns_; |
| 256 | if (selected_index_ >= window_list_.size()) { |
| 257 | selected_index_ = (selected_index_ + 1) % num_columns_; |
| 258 | if (selected_index_ == 0) |
| 259 | out_of_bounds = true; |
| 260 | recreate_selection_widget = true; |
| 261 | } |
| 262 | break; |
| 263 | case WindowSelector::UP: |
| 264 | if (selected_index_ == 0) |
| 265 | out_of_bounds = true; |
| 266 | if (selected_index_ < num_columns_) { |
| 267 | selected_index_ += num_columns_ * |
| 268 | ((window_list_.size() - selected_index_) / num_columns_) - 1; |
| 269 | recreate_selection_widget = true; |
| 270 | } else { |
| 271 | selected_index_ -= num_columns_; |
| 272 | } |
| 273 | break; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | MoveSelectionWidget(direction, recreate_selection_widget, out_of_bounds); |
| 278 | return out_of_bounds; |
| 279 | } |
| 280 | |
| 281 | WindowSelectorItem* WindowGrid::SelectedWindow() const { |
| 282 | CHECK(selected_index_ < window_list_.size()); |
| 283 | return window_list_[selected_index_]; |
| 284 | } |
| 285 | |
| 286 | bool WindowGrid::Contains(const aura::Window* window) const { |
| 287 | return std::find_if(window_list_.begin(), window_list_.end(), |
| 288 | WindowSelectorItemTargetComparator(window)) != |
| 289 | window_list_.end(); |
| 290 | } |
| 291 | |
| 292 | void WindowGrid::OnWindowDestroying(aura::Window* window) { |
| 293 | window->RemoveObserver(this); |
| 294 | observed_windows_.erase(window); |
| 295 | ScopedVector<WindowSelectorItem>::iterator iter = |
| 296 | std::find_if(window_list_.begin(), window_list_.end(), |
| 297 | WindowSelectorItemComparator(window)); |
| 298 | |
| 299 | DCHECK(iter != window_list_.end()); |
| 300 | |
| 301 | (*iter)->RemoveWindow(window); |
| 302 | |
| 303 | // If there are still windows in this selector entry then the overview is |
| 304 | // still active and the active selection remains the same. |
| 305 | if (!(*iter)->empty()) |
| 306 | return; |
| 307 | |
| 308 | size_t removed_index = iter - window_list_.begin(); |
| 309 | window_list_.erase(iter); |
| 310 | |
| 311 | if (empty()) { |
| 312 | // If the grid is now empty, notify the window selector so that it erases us |
| 313 | // from its grid list. |
| 314 | window_selector_->OnGridEmpty(this); |
| 315 | return; |
| 316 | } |
| 317 | |
| 318 | // If selecting, update the selection index. |
| 319 | if (selection_widget_) { |
| 320 | bool send_focus_alert = selected_index_ == removed_index; |
| 321 | if (selected_index_ >= removed_index && selected_index_ != 0) |
| 322 | selected_index_--; |
| 323 | if (send_focus_alert) |
| 324 | SelectedWindow()->SendFocusAlert(); |
| 325 | } |
| 326 | |
| 327 | PositionWindows(true); |
| 328 | } |
| 329 | |
| 330 | void WindowGrid::OnWindowBoundsChanged(aura::Window* window, |
| 331 | const gfx::Rect& old_bounds, |
| 332 | const gfx::Rect& new_bounds) { |
| 333 | ScopedVector<WindowSelectorItem>::const_iterator iter = |
| 334 | std::find_if(window_list_.begin(), window_list_.end(), |
| 335 | WindowSelectorItemTargetComparator(window)); |
| 336 | DCHECK(iter != window_list_.end()); |
| 337 | |
| 338 | // Immediately finish any active bounds animation. |
| 339 | window->layer()->GetAnimator()->StopAnimatingProperty( |
| 340 | ui::LayerAnimationElement::BOUNDS); |
| 341 | |
| 342 | // Recompute the transform for the window. |
| 343 | (*iter)->RecomputeWindowTransforms(); |
| 344 | } |
| 345 | |
| 346 | void WindowGrid::InitSelectionWidget(WindowSelector::Direction direction) { |
| 347 | selection_widget_.reset(new views::Widget); |
| 348 | views::Widget::InitParams params; |
| 349 | params.type = views::Widget::InitParams::TYPE_POPUP; |
| 350 | params.keep_on_top = false; |
| 351 | params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET; |
| 352 | params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW; |
| 353 | params.parent = Shell::GetContainer(root_window_, |
| 354 | kShellWindowId_DefaultContainer); |
| 355 | params.accept_events = false; |
| 356 | selection_widget_->set_focus_on_creation(false); |
| 357 | selection_widget_->Init(params); |
| 358 | // Disable the "bounce in" animation when showing the window. |
| 359 | ::wm::SetWindowVisibilityAnimationTransition( |
| 360 | selection_widget_->GetNativeWindow(), ::wm::ANIMATE_NONE); |
| 361 | views::View* content_view = new views::View; |
| 362 | content_view->set_background( |
| 363 | views::Background::CreateSolidBackground(kWindowOverviewSelectionColor)); |
| 364 | selection_widget_->SetContentsView(content_view); |
| 365 | selection_widget_->GetNativeWindow()->parent()->StackChildAtBottom( |
| 366 | selection_widget_->GetNativeWindow()); |
| 367 | selection_widget_->Show(); |
| 368 | // New selection widget starts with 0 opacity and then fades in. |
| 369 | selection_widget_->GetNativeWindow()->layer()->SetOpacity(0); |
| 370 | |
| 371 | const gfx::Rect target_bounds = SelectedWindow()->target_bounds(); |
| 372 | gfx::Vector2d fade_out_direction = |
| 373 | GetSlideVectorForFadeIn(direction, target_bounds); |
| 374 | gfx::Display dst_display = gfx::Screen::GetScreenFor(root_window_)-> |
| 375 | GetDisplayMatching(target_bounds); |
| 376 | selection_widget_->GetNativeWindow()->SetBoundsInScreen( |
| 377 | target_bounds - fade_out_direction, dst_display); |
| 378 | } |
| 379 | |
| 380 | void WindowGrid::MoveSelectionWidget(WindowSelector::Direction direction, |
| 381 | bool recreate_selection_widget, |
| 382 | bool out_of_bounds) { |
| 383 | // If the selection widget is already active, fade it out in the selection |
| 384 | // direction. |
| 385 | if (selection_widget_ && (recreate_selection_widget || out_of_bounds)) { |
| 386 | // Animate the old selection widget and then destroy it. |
| 387 | views::Widget* old_selection = selection_widget_.get(); |
| 388 | gfx::Vector2d fade_out_direction = |
| 389 | GetSlideVectorForFadeIn( |
| 390 | direction, old_selection->GetNativeWindow()->bounds()); |
| 391 | |
| 392 | ui::ScopedLayerAnimationSettings animation_settings( |
| 393 | old_selection->GetNativeWindow()->layer()->GetAnimator()); |
| 394 | animation_settings.SetTransitionDuration( |
| 395 | base::TimeDelta::FromMilliseconds( |
| 396 | kOverviewSelectorTransitionMilliseconds)); |
| 397 | animation_settings.SetPreemptionStrategy( |
| 398 | ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET); |
| 399 | animation_settings.SetTweenType(gfx::Tween::FAST_OUT_LINEAR_IN); |
| 400 | // CleanupWidgetAfterAnimationObserver will delete itself (and the |
| 401 | // widget) when the movement animation is complete. |
| 402 | animation_settings.AddObserver( |
| 403 | new CleanupWidgetAfterAnimationObserver(selection_widget_.Pass())); |
| 404 | old_selection->SetOpacity(0); |
| 405 | old_selection->GetNativeWindow()->SetBounds( |
| 406 | old_selection->GetNativeWindow()->bounds() + fade_out_direction); |
| 407 | old_selection->Hide(); |
| 408 | } |
| 409 | if (out_of_bounds) |
| 410 | return; |
| 411 | |
| 412 | if (!selection_widget_) |
| 413 | InitSelectionWidget(direction); |
| 414 | // Send an a11y alert so that if ChromeVox is enabled, the item label is |
| 415 | // read. |
| 416 | SelectedWindow()->SendFocusAlert(); |
| 417 | // The selection widget is moved to the newly selected item in the same |
| 418 | // grid. |
| 419 | MoveSelectionWidgetToTarget(true); |
| 420 | } |
| 421 | |
| 422 | void WindowGrid::MoveSelectionWidgetToTarget(bool animate) { |
| 423 | if (animate) { |
| 424 | ui::ScopedLayerAnimationSettings animation_settings( |
| 425 | selection_widget_->GetNativeWindow()->layer()->GetAnimator()); |
| 426 | animation_settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds( |
| 427 | kOverviewSelectorTransitionMilliseconds)); |
| 428 | animation_settings.SetTweenType(gfx::Tween::LINEAR_OUT_SLOW_IN); |
| 429 | animation_settings.SetPreemptionStrategy( |
| 430 | ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET); |
| 431 | selection_widget_->SetBounds(SelectedWindow()->target_bounds()); |
| 432 | selection_widget_->SetOpacity(kWindowOverviewSelectorOpacity); |
| 433 | return; |
| 434 | } |
| 435 | selection_widget_->SetBounds(SelectedWindow()->target_bounds()); |
| 436 | selection_widget_->SetOpacity(kWindowOverviewSelectorOpacity); |
| 437 | } |
| 438 | |
| 439 | } // namespace ash |