src/ash/launcher/launcher_button.cc

   1 // Copyright (c) 2012 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/launcher/launcher_button.h"
   6
   7 #include <algorithm>
   8
   9 #include "ash/ash_switches.h"
  10 #include "ash/launcher/launcher_button_host.h"
  11 #include "ash/shelf/shelf_layout_manager.h"
  12 #include "grit/ash_resources.h"
  13 #include "skia/ext/image_operations.h"
  14 #include "ui/base/accessibility/accessible_view_state.h"
  15 #include "ui/base/resource/resource_bundle.h"
  16 #include "ui/compositor/layer.h"
  17 #include "ui/compositor/scoped_layer_animation_settings.h"
  18 #include "ui/events/event_constants.h"
  19 #include "ui/gfx/animation/animation_delegate.h"
  20 #include "ui/gfx/animation/throb_animation.h"
  21 #include "ui/gfx/canvas.h"
  22 #include "ui/gfx/image/image.h"
  23 #include "ui/gfx/image/image_skia_operations.h"
  24 #include "ui/gfx/skbitmap_operations.h"
  25 #include "ui/views/controls/image_view.h"
  26
  27 namespace {
  28
  29 // Size of the bar. This is along the opposite axis of the shelf. For example,
  30 // if the shelf is aligned horizontally then this is the height of the bar.
  31 const int kBarSize = 3;
  32 const int kIconSize = 32;
  33 const int kHopSpacing = 2;
  34 const int kIconPad = 8;
  35 const int kAlternateIconPad = 5;
  36 const int kAlternateIconPadVertical = 6;
  37 const int kHopUpMS = 0;
  38 const int kHopDownMS = 200;
  39 const int kAttentionThrobDurationMS = 800;
  40
  41 bool ShouldHop(int state) {
  42   return state & ash::internal::LauncherButton::STATE_HOVERED ||
  43       state & ash::internal::LauncherButton::STATE_ACTIVE ||
  44       state & ash::internal::LauncherButton::STATE_FOCUSED;
  45 }
  46
  47 // Simple AnimationDelegate that owns a single ThrobAnimation instance to
  48 // keep all Draw Attention animations in sync.
  49 class LauncherButtonAnimation : public gfx::AnimationDelegate {
  50  public:
  51   class Observer {
  52    public:
  53     virtual void AnimationProgressed() = 0;
  54
  55    protected:
  56     virtual ~Observer() {}
  57   };
  58
  59   static LauncherButtonAnimation* GetInstance() {
  60     static LauncherButtonAnimation* s_instance = new LauncherButtonAnimation();
  61     return s_instance;
  62   }
  63
  64   void AddObserver(Observer* observer) {
  65     observers_.AddObserver(observer);
  66   }
  67
  68   void RemoveObserver(Observer* observer) {
  69     observers_.RemoveObserver(observer);
  70     if (!observers_.might_have_observers())
  71       animation_.Stop();
  72   }
  73
  74   int GetAlpha() {
  75     return GetThrobAnimation().CurrentValueBetween(0, 255);
  76   }
  77
  78   double GetAnimation() {
  79     return GetThrobAnimation().GetCurrentValue();
  80   }
  81
  82  private:
  83   LauncherButtonAnimation()
  84       : animation_(this) {
  85     animation_.SetThrobDuration(kAttentionThrobDurationMS);
  86     animation_.SetTweenType(gfx::Tween::SMOOTH_IN_OUT);
  87   }
  88
  89   virtual ~LauncherButtonAnimation() {
  90   }
  91
  92   gfx::ThrobAnimation& GetThrobAnimation() {
  93     if (!animation_.is_animating()) {
  94       animation_.Reset();
  95       animation_.StartThrobbing(-1 /*throb indefinitely*/);
  96     }
  97     return animation_;
  98   }
  99
 100   // gfx::AnimationDelegate
 101   virtual void AnimationProgressed(const gfx::Animation* animation) OVERRIDE {
 102     if (animation != &animation_)
 103       return;
 104     if (!animation_.is_animating())
 105       return;
 106     FOR_EACH_OBSERVER(Observer, observers_, AnimationProgressed());
 107   }
 108
 109   gfx::ThrobAnimation animation_;
 110   ObserverList<Observer> observers_;
 111
 112   DISALLOW_COPY_AND_ASSIGN(LauncherButtonAnimation);
 113 };
 114
 115 }  // namespace
 116
 117 namespace ash {
 118 namespace internal {
 119
 120 ////////////////////////////////////////////////////////////////////////////////
 121 // LauncherButton::BarView
 122
 123 class LauncherButton::BarView : public views::ImageView,
 124                                 public LauncherButtonAnimation::Observer {
 125  public:
 126   BarView(LauncherButton* host)
 127       : host_(host),
 128         show_attention_(false) {
 129   }
 130
 131   virtual ~BarView() {
 132     if (show_attention_)
 133       LauncherButtonAnimation::GetInstance()->RemoveObserver(this);
 134   }
 135
 136   // View
 137   virtual bool HitTestRect(const gfx::Rect& rect) const OVERRIDE {
 138     // Allow Mouse...() messages to go to the parent view.
 139     return false;
 140   }
 141
 142   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
 143     if (show_attention_) {
 144       int alpha = LauncherButtonAnimation::GetInstance()->GetAlpha();
 145       canvas->SaveLayerAlpha(alpha);
 146       views::ImageView::OnPaint(canvas);
 147       canvas->Restore();
 148     } else {
 149       views::ImageView::OnPaint(canvas);
 150     }
 151   }
 152
 153   // LauncherButtonAnimation::Observer
 154   virtual void AnimationProgressed() OVERRIDE {
 155     UpdateBounds();
 156     SchedulePaint();
 157   }
 158
 159   void SetBarBoundsRect(const gfx::Rect& bounds) {
 160     base_bounds_ = bounds;
 161     UpdateBounds();
 162   }
 163
 164   void ShowAttention(bool show) {
 165     if (show_attention_ != show) {
 166       show_attention_ = show;
 167       if (show_attention_)
 168         LauncherButtonAnimation::GetInstance()->AddObserver(this);
 169       else
 170         LauncherButtonAnimation::GetInstance()->RemoveObserver(this);
 171     }
 172     UpdateBounds();
 173   }
 174
 175  private:
 176   void UpdateBounds() {
 177     gfx::Rect bounds = base_bounds_;
 178     if (show_attention_) {
 179       // Scale from .35 to 1.0 of the total width (which is wider than the
 180       // visible width of the image, so the animation "rests" briefly at full
 181       // visible width.
 182       double animation = LauncherButtonAnimation::GetInstance()->GetAnimation();
 183       double scale = (.35 + .65 * animation);
 184       if (host_->shelf_layout_manager()->GetAlignment() ==
 185           SHELF_ALIGNMENT_BOTTOM) {
 186         bounds.set_width(base_bounds_.width() * scale);
 187         int x_offset = (base_bounds_.width() - bounds.width()) / 2;
 188         bounds.set_x(base_bounds_.x() + x_offset);
 189       } else {
 190         bounds.set_height(base_bounds_.height() * scale);
 191         int y_offset = (base_bounds_.height() - bounds.height()) / 2;
 192         bounds.set_y(base_bounds_.y() + y_offset);
 193       }
 194     }
 195     SetBoundsRect(bounds);
 196   }
 197
 198   LauncherButton* host_;
 199   bool show_attention_;
 200   gfx::Rect base_bounds_;
 201
 202   DISALLOW_COPY_AND_ASSIGN(BarView);
 203 };
 204
 205 ////////////////////////////////////////////////////////////////////////////////
 206 // LauncherButton::IconView
 207
 208 LauncherButton::IconView::IconView() : icon_size_(kIconSize) {
 209 }
 210
 211 LauncherButton::IconView::~IconView() {
 212 }
 213
 214 bool LauncherButton::IconView::HitTestRect(const gfx::Rect& rect) const {
 215   // Return false so that LauncherButton gets all the mouse events.
 216   return false;
 217 }
 218
 219 ////////////////////////////////////////////////////////////////////////////////
 220 // LauncherButton
 221
 222 LauncherButton* LauncherButton::Create(
 223     views::ButtonListener* listener,
 224     LauncherButtonHost* host,
 225     ShelfLayoutManager* shelf_layout_manager) {
 226   LauncherButton* button =
 227       new LauncherButton(listener, host, shelf_layout_manager);
 228   button->Init();
 229   return button;
 230 }
 231
 232 LauncherButton::LauncherButton(views::ButtonListener* listener,
 233                                LauncherButtonHost* host,
 234                                ShelfLayoutManager* shelf_layout_manager)
 235     : CustomButton(listener),
 236       host_(host),
 237       icon_view_(NULL),
 238       bar_(new BarView(this)),
 239       state_(STATE_NORMAL),
 240       shelf_layout_manager_(shelf_layout_manager),
 241       destroyed_flag_(NULL) {
 242   set_accessibility_focusable(true);
 243
 244   const gfx::ShadowValue kShadows[] = {
 245     gfx::ShadowValue(gfx::Point(0, 2), 0, SkColorSetARGB(0x1A, 0, 0, 0)),
 246     gfx::ShadowValue(gfx::Point(0, 3), 1, SkColorSetARGB(0x1A, 0, 0, 0)),
 247     gfx::ShadowValue(gfx::Point(0, 0), 1, SkColorSetARGB(0x54, 0, 0, 0)),
 248   };
 249   icon_shadows_.assign(kShadows, kShadows + arraysize(kShadows));
 250
 251   AddChildView(bar_);
 252 }
 253
 254 LauncherButton::~LauncherButton() {
 255   if (destroyed_flag_)
 256     *destroyed_flag_ = true;
 257 }
 258
 259 void LauncherButton::SetShadowedImage(const gfx::ImageSkia& image) {
 260   icon_view_->SetImage(gfx::ImageSkiaOperations::CreateImageWithDropShadow(
 261       image, icon_shadows_));
 262 }
 263
 264 void LauncherButton::SetImage(const gfx::ImageSkia& image) {
 265   if (image.isNull()) {
 266     // TODO: need an empty image.
 267     icon_view_->SetImage(image);
 268     return;
 269   }
 270
 271   if (icon_view_->icon_size() == 0) {
 272     SetShadowedImage(image);
 273     return;
 274   }
 275
 276   // Resize the image maintaining our aspect ratio.
 277   int pref = icon_view_->icon_size();
 278   float aspect_ratio =
 279       static_cast<float>(image.width()) / static_cast<float>(image.height());
 280   int height = pref;
 281   int width = static_cast<int>(aspect_ratio * height);
 282   if (width > pref) {
 283     width = pref;
 284     height = static_cast<int>(width / aspect_ratio);
 285   }
 286
 287   if (width == image.width() && height == image.height()) {
 288     SetShadowedImage(image);
 289     return;
 290   }
 291
 292   SetShadowedImage(gfx::ImageSkiaOperations::CreateResizedImage(image,
 293       skia::ImageOperations::RESIZE_BEST, gfx::Size(width, height)));
 294 }
 295
 296 const gfx::ImageSkia& LauncherButton::GetImage() const {
 297   return icon_view_->GetImage();
 298 }
 299
 300 void LauncherButton::AddState(State state) {
 301   if (!(state_ & state)) {
 302     if (!ash::switches::UseAlternateShelfLayout() &&
 303         (ShouldHop(state) || !ShouldHop(state_))) {
 304       ui::ScopedLayerAnimationSettings scoped_setter(
 305           icon_view_->layer()->GetAnimator());
 306       scoped_setter.SetTransitionDuration(
 307           base::TimeDelta::FromMilliseconds(kHopUpMS));
 308     }
 309     state_ |= state;
 310     Layout();
 311     if (state & STATE_ATTENTION)
 312       bar_->ShowAttention(true);
 313   }
 314 }
 315
 316 void LauncherButton::ClearState(State state) {
 317   if (state_ & state) {
 318     if (!ash::switches::UseAlternateShelfLayout() &&
 319         (!ShouldHop(state) || ShouldHop(state_))) {
 320       ui::ScopedLayerAnimationSettings scoped_setter(
 321           icon_view_->layer()->GetAnimator());
 322       scoped_setter.SetTweenType(gfx::Tween::LINEAR);
 323       scoped_setter.SetTransitionDuration(
 324           base::TimeDelta::FromMilliseconds(kHopDownMS));
 325     }
 326     state_ &= ~state;
 327     Layout();
 328     if (state & STATE_ATTENTION)
 329       bar_->ShowAttention(false);
 330   }
 331 }
 332
 333 gfx::Rect LauncherButton::GetIconBounds() const {
 334   return icon_view_->bounds();
 335 }
 336
 337 void LauncherButton::ShowContextMenu(const gfx::Point& p,
 338                                      ui::MenuSourceType source_type) {
 339   if (!context_menu_controller())
 340     return;
 341
 342   bool destroyed = false;
 343   destroyed_flag_ = &destroyed;
 344
 345   CustomButton::ShowContextMenu(p, source_type);
 346
 347   if (!destroyed) {
 348     destroyed_flag_ = NULL;
 349     // The menu will not propagate mouse events while its shown. To address,
 350     // the hover state gets cleared once the menu was shown (and this was not
 351     // destroyed).
 352     ClearState(STATE_HOVERED);
 353   }
 354 }
 355
 356 bool LauncherButton::OnMousePressed(const ui::MouseEvent& event) {
 357   CustomButton::OnMousePressed(event);
 358   host_->PointerPressedOnButton(this, LauncherButtonHost::MOUSE, event);
 359   return true;
 360 }
 361
 362 void LauncherButton::OnMouseReleased(const ui::MouseEvent& event) {
 363   CustomButton::OnMouseReleased(event);
 364   host_->PointerReleasedOnButton(this, LauncherButtonHost::MOUSE, false);
 365 }
 366
 367 void LauncherButton::OnMouseCaptureLost() {
 368   ClearState(STATE_HOVERED);
 369   host_->PointerReleasedOnButton(this, LauncherButtonHost::MOUSE, true);
 370   CustomButton::OnMouseCaptureLost();
 371 }
 372
 373 bool LauncherButton::OnMouseDragged(const ui::MouseEvent& event) {
 374   CustomButton::OnMouseDragged(event);
 375   host_->PointerDraggedOnButton(this, LauncherButtonHost::MOUSE, event);
 376   return true;
 377 }
 378
 379 void LauncherButton::OnMouseMoved(const ui::MouseEvent& event) {
 380   CustomButton::OnMouseMoved(event);
 381   host_->MouseMovedOverButton(this);
 382 }
 383
 384 void LauncherButton::OnMouseEntered(const ui::MouseEvent& event) {
 385   AddState(STATE_HOVERED);
 386   CustomButton::OnMouseEntered(event);
 387   host_->MouseEnteredButton(this);
 388 }
 389
 390 void LauncherButton::OnMouseExited(const ui::MouseEvent& event) {
 391   ClearState(STATE_HOVERED);
 392   CustomButton::OnMouseExited(event);
 393   host_->MouseExitedButton(this);
 394 }
 395
 396 void LauncherButton::GetAccessibleState(ui::AccessibleViewState* state) {
 397   state->role = ui::AccessibilityTypes::ROLE_PUSHBUTTON;
 398   state->name = host_->GetAccessibleName(this);
 399 }
 400
 401 void LauncherButton::Layout() {
 402   const gfx::Rect button_bounds(GetContentsBounds());
 403   int icon_pad = kIconPad;
 404   if (ash::switches::UseAlternateShelfLayout()) {
 405       icon_pad =
 406           shelf_layout_manager_->GetAlignment() != SHELF_ALIGNMENT_BOTTOM ?
 407           kAlternateIconPadVertical : kAlternateIconPad;
 408   }
 409   int x_offset = shelf_layout_manager_->PrimaryAxisValue(0, icon_pad);
 410   int y_offset = shelf_layout_manager_->PrimaryAxisValue(icon_pad, 0);
 411
 412   int icon_width = std::min(kIconSize,
 413       button_bounds.width() - x_offset);
 414   int icon_height = std::min(kIconSize,
 415       button_bounds.height() - y_offset);
 416
 417   // If on the left or top 'invert' the inset so the constant gap is on
 418   // the interior (towards the center of display) edge of the shelf.
 419   if (SHELF_ALIGNMENT_LEFT == shelf_layout_manager_->GetAlignment())
 420     x_offset = button_bounds.width() - (kIconSize + icon_pad);
 421
 422   if (SHELF_ALIGNMENT_TOP == shelf_layout_manager_->GetAlignment())
 423     y_offset = button_bounds.height() - (kIconSize + icon_pad);
 424
 425   if (ShouldHop(state_) && !ash::switches::UseAlternateShelfLayout()) {
 426     x_offset += shelf_layout_manager_->SelectValueForShelfAlignment(
 427         0, kHopSpacing, -kHopSpacing, 0);
 428     y_offset += shelf_layout_manager_->SelectValueForShelfAlignment(
 429         -kHopSpacing, 0, 0, kHopSpacing);
 430   }
 431
 432   // Center icon with respect to the secondary axis, and ensure
 433   // that the icon doesn't occlude the bar highlight.
 434   if (shelf_layout_manager_->IsHorizontalAlignment()) {
 435     x_offset = std::max(0, button_bounds.width() - icon_width) / 2;
 436     if (y_offset + icon_height + kBarSize > button_bounds.height())
 437       icon_height = button_bounds.height() - (y_offset + kBarSize);
 438   } else {
 439     y_offset = std::max(0, button_bounds.height() - icon_height) / 2;
 440     if (x_offset + icon_width + kBarSize > button_bounds.width())
 441       icon_width = button_bounds.width() - (x_offset + kBarSize);
 442   }
 443
 444   icon_view_->SetBoundsRect(gfx::Rect(
 445       button_bounds.x() + x_offset,
 446       button_bounds.y() + y_offset,
 447       icon_width,
 448       icon_height));
 449
 450   // Icon size has been incorrect when running
 451   // PanelLayoutManagerTest.PanelAlignmentSecondDisplay on valgrind bot, see
 452   // http://crbug.com/234854.
 453   DCHECK_LE(icon_width, kIconSize);
 454   DCHECK_LE(icon_height, kIconSize);
 455
 456   bar_->SetBarBoundsRect(button_bounds);
 457
 458   UpdateState();
 459 }
 460
 461 void LauncherButton::ChildPreferredSizeChanged(views::View* child) {
 462   Layout();
 463 }
 464
 465 void LauncherButton::OnFocus() {
 466   AddState(STATE_FOCUSED);
 467   CustomButton::OnFocus();
 468 }
 469
 470 void LauncherButton::OnBlur() {
 471   ClearState(STATE_FOCUSED);
 472   CustomButton::OnBlur();
 473 }
 474
 475 void LauncherButton::OnGestureEvent(ui::GestureEvent* event) {
 476   switch (event->type()) {
 477     case ui::ET_GESTURE_TAP_DOWN:
 478       AddState(STATE_HOVERED);
 479       return CustomButton::OnGestureEvent(event);
 480     case ui::ET_GESTURE_END:
 481       ClearState(STATE_HOVERED);
 482       return CustomButton::OnGestureEvent(event);
 483     case ui::ET_GESTURE_SCROLL_BEGIN:
 484       host_->PointerPressedOnButton(this, LauncherButtonHost::TOUCH, *event);
 485       event->SetHandled();
 486       return;
 487     case ui::ET_GESTURE_SCROLL_UPDATE:
 488       host_->PointerDraggedOnButton(this, LauncherButtonHost::TOUCH, *event);
 489       event->SetHandled();
 490       return;
 491     case ui::ET_GESTURE_SCROLL_END:
 492     case ui::ET_SCROLL_FLING_START:
 493       host_->PointerReleasedOnButton(this, LauncherButtonHost::TOUCH, false);
 494       event->SetHandled();
 495       return;
 496     default:
 497       return CustomButton::OnGestureEvent(event);
 498   }
 499 }
 500
 501 void LauncherButton::Init() {
 502   icon_view_ = CreateIconView();
 503
 504   // TODO: refactor the layers so each button doesn't require 2.
 505   icon_view_->SetPaintToLayer(true);
 506   icon_view_->SetFillsBoundsOpaquely(false);
 507   icon_view_->SetHorizontalAlignment(views::ImageView::CENTER);
 508   icon_view_->SetVerticalAlignment(views::ImageView::LEADING);
 509
 510   AddChildView(icon_view_);
 511 }
 512
 513 LauncherButton::IconView* LauncherButton::CreateIconView() {
 514   return new IconView;
 515 }
 516
 517 bool LauncherButton::IsShelfHorizontal() const {
 518   return shelf_layout_manager_->IsHorizontalAlignment();
 519 }
 520
 521 void LauncherButton::UpdateState() {
 522   UpdateBar();
 523
 524   icon_view_->SetHorizontalAlignment(
 525       shelf_layout_manager_->PrimaryAxisValue(views::ImageView::CENTER,
 526                                               views::ImageView::LEADING));
 527   icon_view_->SetVerticalAlignment(
 528       shelf_layout_manager_->PrimaryAxisValue(views::ImageView::LEADING,
 529                                               views::ImageView::CENTER));
 530   SchedulePaint();
 531 }
 532
 533 void LauncherButton::UpdateBar() {
 534   if (state_ & STATE_HIDDEN) {
 535     bar_->SetVisible(false);
 536     return;
 537   }
 538
 539   int bar_id = 0;
 540   if (ash::switches::UseAlternateShelfLayout()) {
 541     if (state_ & STATE_ACTIVE)
 542       bar_id = IDR_AURA_LAUNCHER_UNDERLINE_ACTIVE_ALTERNATE;
 543     else if (state_ & STATE_RUNNING)
 544       bar_id = IDR_AURA_LAUNCHER_UNDERLINE_RUNNING_ALTERNATE;
 545   } else {
 546     if (state_ & (STATE_ACTIVE | STATE_ATTENTION))
 547       bar_id = IDR_AURA_LAUNCHER_UNDERLINE_ACTIVE;
 548     else if (state_ & (STATE_HOVERED | STATE_FOCUSED))
 549       bar_id = IDR_AURA_LAUNCHER_UNDERLINE_HOVER;
 550     else
 551       bar_id = IDR_AURA_LAUNCHER_UNDERLINE_RUNNING;
 552   }
 553
 554   if (bar_id != 0) {
 555     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
 556     const gfx::ImageSkia* image = rb.GetImageNamed(bar_id).ToImageSkia();
 557     if (shelf_layout_manager_->GetAlignment() == SHELF_ALIGNMENT_BOTTOM) {
 558       bar_->SetImage(*image);
 559     } else {
 560       bar_->SetImage(gfx::ImageSkiaOperations::CreateRotatedImage(*image,
 561           shelf_layout_manager_->SelectValueForShelfAlignment(
 562               SkBitmapOperations::ROTATION_90_CW,
 563               SkBitmapOperations::ROTATION_90_CW,
 564               SkBitmapOperations::ROTATION_270_CW,
 565               SkBitmapOperations::ROTATION_180_CW)));
 566     }
 567     bar_->SetHorizontalAlignment(
 568         shelf_layout_manager_->SelectValueForShelfAlignment(
 569             views::ImageView::CENTER,
 570             views::ImageView::LEADING,
 571             views::ImageView::TRAILING,
 572             views::ImageView::CENTER));
 573     bar_->SetVerticalAlignment(
 574         shelf_layout_manager_->SelectValueForShelfAlignment(
 575             views::ImageView::TRAILING,
 576             views::ImageView::CENTER,
 577             views::ImageView::CENTER,
 578             views::ImageView::LEADING));
 579     bar_->SchedulePaint();
 580   }
 581
 582   bar_->SetVisible(bar_id != 0 && state_ != STATE_NORMAL);
 583 }
 584
 585 }  // namespace internal
 586 }  // namespace ash