src/chrome/browser/ui/views/desktop_media_picker_views.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 "chrome/browser/media/desktop_media_picker.h"
   6
   7 #include "base/callback.h"
   8 #include "chrome/browser/media/desktop_media_list.h"
   9 #include "chrome/browser/media/desktop_media_list_observer.h"
  10 #include "chrome/browser/ui/ash/ash_util.h"
  11 #include "content/public/browser/browser_thread.h"
  12 #include "grit/generated_resources.h"
  13 #include "ui/aura/window_tree_host.h"
  14 #include "ui/base/l10n/l10n_util.h"
  15 #include "ui/events/keycodes/keyboard_codes.h"
  16 #include "ui/gfx/canvas.h"
  17 #include "ui/native_theme/native_theme.h"
  18 #include "ui/views/background.h"
  19 #include "ui/views/controls/image_view.h"
  20 #include "ui/views/controls/label.h"
  21 #include "ui/views/controls/scroll_view.h"
  22 #include "ui/views/layout/box_layout.h"
  23 #include "ui/views/layout/layout_constants.h"
  24 #include "ui/views/widget/widget.h"
  25 #include "ui/views/window/dialog_client_view.h"
  26 #include "ui/views/window/dialog_delegate.h"
  27 #include "ui/wm/core/shadow_types.h"
  28
  29 using content::DesktopMediaID;
  30
  31 namespace {
  32
  33 const int kThumbnailWidth = 160;
  34 const int kThumbnailHeight = 100;
  35 const int kThumbnailMargin = 10;
  36 const int kLabelHeight = 40;
  37 const int kListItemWidth = kThumbnailMargin * 2 + kThumbnailWidth;
  38 const int kListItemHeight =
  39     kThumbnailMargin * 2 + kThumbnailHeight + kLabelHeight;
  40 const int kListColumns = 3;
  41 const int kTotalListWidth = kListColumns * kListItemWidth;
  42
  43 const int kDesktopMediaSourceViewGroupId = 1;
  44
  45 const char kDesktopMediaSourceViewClassName[] =
  46     "DesktopMediaPicker_DesktopMediaSourceView";
  47
  48 content::DesktopMediaID::Id AcceleratedWidgetToDesktopMediaId(
  49     gfx::AcceleratedWidget accelerated_widget) {
  50 #if defined(OS_WIN)
  51   return reinterpret_cast<content::DesktopMediaID::Id>(accelerated_widget);
  52 #else
  53   return static_cast<content::DesktopMediaID::Id>(accelerated_widget);
  54 #endif
  55 }
  56
  57 class DesktopMediaListView;
  58 class DesktopMediaPickerDialogView;
  59 class DesktopMediaPickerViews;
  60
  61 // View used for each item in DesktopMediaListView. Shows a single desktop media
  62 // source as a thumbnail with the title under it.
  63 class DesktopMediaSourceView : public views::View {
  64  public:
  65   DesktopMediaSourceView(DesktopMediaListView* parent,
  66                          DesktopMediaID source_id);
  67   virtual ~DesktopMediaSourceView();
  68
  69   // Updates thumbnail and title from |source|.
  70   void SetName(const base::string16& name);
  71   void SetThumbnail(const gfx::ImageSkia& thumbnail);
  72
  73   // Id for the source shown by this View.
  74   const DesktopMediaID& source_id() const {
  75     return source_id_;
  76   }
  77
  78   // Returns true if the source is selected.
  79   bool is_selected() const { return selected_; }
  80
  81   // Updates selection state of the element. If |selected| is true then also
  82   // calls SetSelected(false) for the source view that was selected before that
  83   // (if any).
  84   void SetSelected(bool selected);
  85
  86   // views::View interface.
  87   virtual const char* GetClassName() const OVERRIDE;
  88   virtual void Layout() OVERRIDE;
  89   virtual views::View* GetSelectedViewForGroup(int group) OVERRIDE;
  90   virtual bool IsGroupFocusTraversable() const OVERRIDE;
  91   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
  92   virtual void OnFocus() OVERRIDE;
  93   virtual void OnBlur() OVERRIDE;
  94   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
  95
  96  private:
  97   DesktopMediaListView* parent_;
  98   DesktopMediaID source_id_;
  99
 100   views::ImageView* image_view_;
 101   views::Label* label_;
 102
 103   bool selected_;
 104
 105   DISALLOW_COPY_AND_ASSIGN(DesktopMediaSourceView);
 106 };
 107
 108 // View that shows list of desktop media sources available from
 109 // DesktopMediaList.
 110 class DesktopMediaListView : public views::View,
 111                              public DesktopMediaListObserver {
 112  public:
 113   DesktopMediaListView(DesktopMediaPickerDialogView* parent,
 114                        scoped_ptr<DesktopMediaList> media_list);
 115   virtual ~DesktopMediaListView();
 116
 117   void StartUpdating(content::DesktopMediaID::Id dialog_window_id);
 118
 119   // Called by DesktopMediaSourceView when selection has changed.
 120   void OnSelectionChanged();
 121
 122   // Called by DesktopMediaSourceView when a source has been double-clicked.
 123   void OnDoubleClick();
 124
 125   // Returns currently selected source.
 126   DesktopMediaSourceView* GetSelection();
 127
 128   // views::View overrides.
 129   virtual gfx::Size GetPreferredSize() OVERRIDE;
 130   virtual void Layout() OVERRIDE;
 131   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
 132
 133  private:
 134   // DesktopMediaList::Observer interface
 135   virtual void OnSourceAdded(int index) OVERRIDE;
 136   virtual void OnSourceRemoved(int index) OVERRIDE;
 137   virtual void OnSourceMoved(int old_index, int new_index) OVERRIDE;
 138   virtual void OnSourceNameChanged(int index) OVERRIDE;
 139   virtual void OnSourceThumbnailChanged(int index) OVERRIDE;
 140
 141   DesktopMediaPickerDialogView* parent_;
 142   scoped_ptr<DesktopMediaList> media_list_;
 143
 144   DISALLOW_COPY_AND_ASSIGN(DesktopMediaListView);
 145 };
 146
 147 // Dialog view used for DesktopMediaPickerViews.
 148 class DesktopMediaPickerDialogView : public views::DialogDelegateView {
 149  public:
 150   DesktopMediaPickerDialogView(gfx::NativeWindow context,
 151                                gfx::NativeWindow parent_window,
 152                                DesktopMediaPickerViews* parent,
 153                                const base::string16& app_name,
 154                                const base::string16& target_name,
 155                                scoped_ptr<DesktopMediaList> media_list);
 156   virtual ~DesktopMediaPickerDialogView();
 157
 158   // Called by parent (DesktopMediaPickerViews) when it's destroyed.
 159   void DetachParent();
 160
 161   // Called by DesktopMediaListView.
 162   void OnSelectionChanged();
 163   void OnDoubleClick();
 164
 165   // views::View overrides.
 166   virtual gfx::Size GetPreferredSize() OVERRIDE;
 167   virtual void Layout() OVERRIDE;
 168
 169   // views::DialogDelegateView overrides.
 170   virtual base::string16 GetWindowTitle() const OVERRIDE;
 171   virtual bool IsDialogButtonEnabled(ui::DialogButton button) const OVERRIDE;
 172   virtual base::string16 GetDialogButtonLabel(
 173       ui::DialogButton button) const OVERRIDE;
 174   virtual bool Accept() OVERRIDE;
 175   virtual void DeleteDelegate() OVERRIDE;
 176
 177  private:
 178   DesktopMediaPickerViews* parent_;
 179   base::string16 app_name_;
 180
 181   views::Label* label_;
 182   views::ScrollView* scroll_view_;
 183   DesktopMediaListView* list_view_;
 184
 185   DISALLOW_COPY_AND_ASSIGN(DesktopMediaPickerDialogView);
 186 };
 187
 188 // Implementation of DesktopMediaPicker for Views.
 189 class DesktopMediaPickerViews : public DesktopMediaPicker {
 190  public:
 191   DesktopMediaPickerViews();
 192   virtual ~DesktopMediaPickerViews();
 193
 194   void NotifyDialogResult(DesktopMediaID source);
 195
 196   // DesktopMediaPicker overrides.
 197   virtual void Show(gfx::NativeWindow context,
 198                     gfx::NativeWindow parent,
 199                     const base::string16& app_name,
 200                     const base::string16& target_name,
 201                     scoped_ptr<DesktopMediaList> media_list,
 202                     const DoneCallback& done_callback) OVERRIDE;
 203
 204  private:
 205   DoneCallback callback_;
 206
 207   // The |dialog_| is owned by the corresponding views::Widget instance.
 208   // When DesktopMediaPickerViews is destroyed the |dialog_| is destroyed
 209   // asynchronously by closing the widget.
 210   DesktopMediaPickerDialogView* dialog_;
 211
 212   DISALLOW_COPY_AND_ASSIGN(DesktopMediaPickerViews);
 213 };
 214
 215 DesktopMediaSourceView::DesktopMediaSourceView(
 216     DesktopMediaListView* parent,
 217     DesktopMediaID source_id)
 218     : parent_(parent),
 219       source_id_(source_id),
 220       image_view_(new views::ImageView()),
 221       label_(new views::Label()),
 222       selected_(false)  {
 223   AddChildView(image_view_);
 224   AddChildView(label_);
 225   SetFocusable(true);
 226 }
 227
 228 DesktopMediaSourceView::~DesktopMediaSourceView() {}
 229
 230 void DesktopMediaSourceView::SetName(const base::string16& name) {
 231   label_->SetText(name);
 232 }
 233
 234 void DesktopMediaSourceView::SetThumbnail(const gfx::ImageSkia& thumbnail) {
 235   image_view_->SetImage(thumbnail);
 236 }
 237
 238 void DesktopMediaSourceView::SetSelected(bool selected) {
 239   if (selected == selected_)
 240     return;
 241   selected_ = selected;
 242
 243   if (selected) {
 244     // Unselect all other sources.
 245     Views neighbours;
 246     parent()->GetViewsInGroup(GetGroup(), &neighbours);
 247     for (Views::iterator i(neighbours.begin()); i != neighbours.end(); ++i) {
 248       if (*i != this) {
 249         DCHECK_EQ((*i)->GetClassName(), kDesktopMediaSourceViewClassName);
 250         DesktopMediaSourceView* source_view =
 251             static_cast<DesktopMediaSourceView*>(*i);
 252         source_view->SetSelected(false);
 253       }
 254     }
 255
 256     const SkColor bg_color = GetNativeTheme()->GetSystemColor(
 257         ui::NativeTheme::kColorId_FocusedMenuItemBackgroundColor);
 258     set_background(views::Background::CreateSolidBackground(bg_color));
 259
 260     parent_->OnSelectionChanged();
 261   } else {
 262     set_background(NULL);
 263   }
 264
 265   SchedulePaint();
 266 }
 267
 268 const char* DesktopMediaSourceView::GetClassName() const {
 269   return kDesktopMediaSourceViewClassName;
 270 }
 271
 272 void DesktopMediaSourceView::Layout() {
 273   image_view_->SetBounds(kThumbnailMargin, kThumbnailMargin,
 274                          kThumbnailWidth, kThumbnailHeight);
 275   label_->SetBounds(kThumbnailMargin, kThumbnailHeight + kThumbnailMargin,
 276                     kThumbnailWidth, kLabelHeight);
 277 }
 278
 279 views::View* DesktopMediaSourceView::GetSelectedViewForGroup(int group) {
 280   Views neighbours;
 281   parent()->GetViewsInGroup(group, &neighbours);
 282   if (neighbours.empty())
 283     return NULL;
 284
 285   for (Views::iterator i(neighbours.begin()); i != neighbours.end(); ++i) {
 286     DCHECK_EQ((*i)->GetClassName(), kDesktopMediaSourceViewClassName);
 287     DesktopMediaSourceView* source_view =
 288         static_cast<DesktopMediaSourceView*>(*i);
 289     if (source_view->selected_)
 290       return source_view;
 291   }
 292   return NULL;
 293 }
 294
 295 bool DesktopMediaSourceView::IsGroupFocusTraversable() const {
 296   return false;
 297 }
 298
 299 void DesktopMediaSourceView::OnPaint(gfx::Canvas* canvas) {
 300   View::OnPaint(canvas);
 301   if (HasFocus()) {
 302     gfx::Rect bounds(GetLocalBounds());
 303     bounds.Inset(kThumbnailMargin / 2, kThumbnailMargin / 2);
 304     canvas->DrawFocusRect(bounds);
 305   }
 306 }
 307
 308 void DesktopMediaSourceView::OnFocus() {
 309   View::OnFocus();
 310   SetSelected(true);
 311   ScrollRectToVisible(gfx::Rect(size()));
 312   // We paint differently when focused.
 313   SchedulePaint();
 314 }
 315
 316 void DesktopMediaSourceView::OnBlur() {
 317   View::OnBlur();
 318   // We paint differently when focused.
 319   SchedulePaint();
 320 }
 321
 322 bool DesktopMediaSourceView::OnMousePressed(const ui::MouseEvent& event) {
 323   if (event.GetClickCount() == 1) {
 324     RequestFocus();
 325   } else if (event.GetClickCount() == 2) {
 326     RequestFocus();
 327     parent_->OnDoubleClick();
 328   }
 329   return true;
 330 }
 331
 332 DesktopMediaListView::DesktopMediaListView(
 333     DesktopMediaPickerDialogView* parent,
 334     scoped_ptr<DesktopMediaList> media_list)
 335     : parent_(parent),
 336       media_list_(media_list.Pass()) {
 337   media_list_->SetThumbnailSize(gfx::Size(kThumbnailWidth, kThumbnailHeight));
 338 }
 339
 340 DesktopMediaListView::~DesktopMediaListView() {}
 341
 342 void DesktopMediaListView::StartUpdating(
 343     content::DesktopMediaID::Id dialog_window_id) {
 344   media_list_->SetViewDialogWindowId(dialog_window_id);
 345   media_list_->StartUpdating(this);
 346 }
 347
 348 void DesktopMediaListView::OnSelectionChanged() {
 349   parent_->OnSelectionChanged();
 350 }
 351
 352 void DesktopMediaListView::OnDoubleClick() {
 353   parent_->OnDoubleClick();
 354 }
 355
 356 DesktopMediaSourceView* DesktopMediaListView::GetSelection() {
 357   for (int i = 0; i < child_count(); ++i) {
 358     DesktopMediaSourceView* source_view =
 359         static_cast<DesktopMediaSourceView*>(child_at(i));
 360     DCHECK_EQ(source_view->GetClassName(), kDesktopMediaSourceViewClassName);
 361     if (source_view->is_selected())
 362       return source_view;
 363   }
 364   return NULL;
 365 }
 366
 367 gfx::Size DesktopMediaListView::GetPreferredSize() {
 368   int total_rows = (child_count() + kListColumns - 1) / kListColumns;
 369   return gfx::Size(kTotalListWidth, kListItemHeight * total_rows);
 370 }
 371
 372 void DesktopMediaListView::Layout() {
 373   int x = 0;
 374   int y = 0;
 375
 376   for (int i = 0; i < child_count(); ++i) {
 377     if (x + kListItemWidth > kTotalListWidth) {
 378       x = 0;
 379       y += kListItemHeight;
 380     }
 381
 382     View* source_view = child_at(i);
 383     source_view->SetBounds(x, y, kListItemWidth, kListItemHeight);
 384
 385     x += kListItemWidth;
 386   }
 387
 388   y += kListItemHeight;
 389   SetSize(gfx::Size(kTotalListWidth, y));
 390 }
 391
 392 bool DesktopMediaListView::OnKeyPressed(const ui::KeyEvent& event) {
 393   int position_increment = 0;
 394   switch (event.key_code()) {
 395     case ui::VKEY_UP:
 396       position_increment = -kListColumns;
 397       break;
 398     case ui::VKEY_DOWN:
 399       position_increment = kListColumns;
 400       break;
 401     case ui::VKEY_LEFT:
 402       position_increment = -1;
 403       break;
 404     case ui::VKEY_RIGHT:
 405       position_increment = 1;
 406       break;
 407     default:
 408       return false;
 409   }
 410
 411   if (position_increment != 0) {
 412     DesktopMediaSourceView* selected = GetSelection();
 413     DesktopMediaSourceView* new_selected = NULL;
 414
 415     if (selected) {
 416       int index = GetIndexOf(selected);
 417       int new_index = index + position_increment;
 418       if (new_index >= child_count())
 419         new_index = child_count() - 1;
 420       else if (new_index < 0)
 421         new_index = 0;
 422       if (index != new_index) {
 423         new_selected =
 424             static_cast<DesktopMediaSourceView*>(child_at(new_index));
 425       }
 426     } else if (has_children()) {
 427       new_selected = static_cast<DesktopMediaSourceView*>(child_at(0));
 428     }
 429
 430     if (new_selected) {
 431       GetFocusManager()->SetFocusedView(new_selected);
 432     }
 433
 434     return true;
 435   }
 436
 437   return false;
 438 }
 439
 440 void DesktopMediaListView::OnSourceAdded(int index) {
 441   const DesktopMediaList::Source& source = media_list_->GetSource(index);
 442   DesktopMediaSourceView* source_view =
 443       new DesktopMediaSourceView(this, source.id);
 444   source_view->SetName(source.name);
 445   source_view->SetGroup(kDesktopMediaSourceViewGroupId);
 446   AddChildViewAt(source_view, index);
 447
 448   PreferredSizeChanged();
 449 }
 450
 451 void DesktopMediaListView::OnSourceRemoved(int index) {
 452   DesktopMediaSourceView* view =
 453       static_cast<DesktopMediaSourceView*>(child_at(index));
 454   DCHECK(view);
 455   DCHECK_EQ(view->GetClassName(), kDesktopMediaSourceViewClassName);
 456   bool was_selected = view->is_selected();
 457   RemoveChildView(view);
 458   delete view;
 459
 460   if (was_selected)
 461     OnSelectionChanged();
 462
 463   PreferredSizeChanged();
 464 }
 465
 466 void DesktopMediaListView::OnSourceMoved(int old_index, int new_index) {
 467   DesktopMediaSourceView* view =
 468       static_cast<DesktopMediaSourceView*>(child_at(old_index));
 469   ReorderChildView(view, new_index);
 470   PreferredSizeChanged();
 471 }
 472
 473 void DesktopMediaListView::OnSourceNameChanged(int index) {
 474   const DesktopMediaList::Source& source = media_list_->GetSource(index);
 475   DesktopMediaSourceView* source_view =
 476       static_cast<DesktopMediaSourceView*>(child_at(index));
 477   source_view->SetName(source.name);
 478 }
 479
 480 void DesktopMediaListView::OnSourceThumbnailChanged(int index) {
 481   const DesktopMediaList::Source& source = media_list_->GetSource(index);
 482   DesktopMediaSourceView* source_view =
 483       static_cast<DesktopMediaSourceView*>(child_at(index));
 484   source_view->SetThumbnail(source.thumbnail);
 485 }
 486
 487 DesktopMediaPickerDialogView::DesktopMediaPickerDialogView(
 488     gfx::NativeWindow context,
 489     gfx::NativeWindow parent_window,
 490     DesktopMediaPickerViews* parent,
 491     const base::string16& app_name,
 492     const base::string16& target_name,
 493     scoped_ptr<DesktopMediaList> media_list)
 494     : parent_(parent),
 495       app_name_(app_name),
 496       label_(new views::Label()),
 497       scroll_view_(views::ScrollView::CreateScrollViewWithBorder()),
 498       list_view_(new DesktopMediaListView(this, media_list.Pass())) {
 499   if (app_name == target_name) {
 500     label_->SetText(
 501         l10n_util::GetStringFUTF16(IDS_DESKTOP_MEDIA_PICKER_TEXT, app_name));
 502   } else {
 503     label_->SetText(l10n_util::GetStringFUTF16(
 504         IDS_DESKTOP_MEDIA_PICKER_TEXT_DELEGATED, app_name, target_name));
 505   }
 506   label_->SetMultiLine(true);
 507   label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 508   AddChildView(label_);
 509
 510   scroll_view_->SetContents(list_view_);
 511   AddChildView(scroll_view_);
 512
 513   DialogDelegate::CreateDialogWidget(this, context, parent_window);
 514
 515   // DesktopMediaList needs to know the ID of the picker window which
 516   // matches the ID it gets from the OS. Depending on the OS and configuration
 517   // we get this ID differently.
 518   content::DesktopMediaID::Id dialog_window_id = 0;
 519
 520 #if defined(USE_ASH)
 521   if (chrome::IsNativeWindowInAsh(GetWidget()->GetNativeWindow())) {
 522     dialog_window_id = content::DesktopMediaID::RegisterAuraWindow(
 523         GetWidget()->GetNativeWindow()).id;
 524   } else
 525 #endif
 526   {
 527     dialog_window_id = AcceleratedWidgetToDesktopMediaId(
 528         GetWidget()->GetNativeWindow()->GetHost()->
 529             GetAcceleratedWidget());
 530   }
 531
 532   list_view_->StartUpdating(dialog_window_id);
 533
 534   GetWidget()->Show();
 535 }
 536
 537 DesktopMediaPickerDialogView::~DesktopMediaPickerDialogView() {}
 538
 539 void DesktopMediaPickerDialogView::DetachParent() {
 540   parent_ = NULL;
 541 }
 542
 543 gfx::Size DesktopMediaPickerDialogView::GetPreferredSize() {
 544   return gfx::Size(600, 500);
 545 }
 546
 547 void DesktopMediaPickerDialogView::Layout() {
 548   gfx::Rect rect = GetLocalBounds();
 549   rect.Inset(views::kPanelHorizMargin, views::kPanelVertMargin);
 550
 551   gfx::Rect label_rect(rect.x(), rect.y(), rect.width(),
 552                        label_->GetHeightForWidth(rect.width()));
 553   label_->SetBoundsRect(label_rect);
 554
 555   int scroll_view_top = label_rect.bottom() + views::kPanelVerticalSpacing;
 556   scroll_view_->SetBounds(
 557       rect.x(), scroll_view_top,
 558       rect.width(), rect.height() - scroll_view_top);
 559 }
 560
 561 base::string16 DesktopMediaPickerDialogView::GetWindowTitle() const {
 562   return l10n_util::GetStringFUTF16(IDS_DESKTOP_MEDIA_PICKER_TITLE, app_name_);
 563 }
 564
 565 bool DesktopMediaPickerDialogView::IsDialogButtonEnabled(
 566     ui::DialogButton button) const {
 567   if (button == ui::DIALOG_BUTTON_OK)
 568     return list_view_->GetSelection() != NULL;
 569   return true;
 570 }
 571
 572 base::string16 DesktopMediaPickerDialogView::GetDialogButtonLabel(
 573     ui::DialogButton button) const {
 574   return l10n_util::GetStringUTF16(button == ui::DIALOG_BUTTON_OK ?
 575       IDS_DESKTOP_MEDIA_PICKER_SHARE : IDS_CANCEL);
 576 }
 577
 578 bool DesktopMediaPickerDialogView::Accept() {
 579   DesktopMediaSourceView* selection = list_view_->GetSelection();
 580
 581   // Ok button should only be enabled when a source is selected.
 582   DCHECK(selection);
 583
 584   DesktopMediaID source;
 585   if (selection)
 586     source = selection->source_id();
 587
 588   if (parent_)
 589     parent_->NotifyDialogResult(source);
 590
 591   // Return true to close the window.
 592   return true;
 593 }
 594
 595 void DesktopMediaPickerDialogView::DeleteDelegate() {
 596   // If the dialog is being closed then notify the parent about it.
 597   if (parent_)
 598     parent_->NotifyDialogResult(DesktopMediaID());
 599   delete this;
 600 }
 601
 602 void DesktopMediaPickerDialogView::OnSelectionChanged() {
 603   GetDialogClientView()->UpdateDialogButtons();
 604 }
 605
 606 void DesktopMediaPickerDialogView::OnDoubleClick() {
 607   // This will call Accept() and close the dialog.
 608   GetDialogClientView()->AcceptWindow();
 609 }
 610
 611 DesktopMediaPickerViews::DesktopMediaPickerViews()
 612     : dialog_(NULL) {
 613 }
 614
 615 DesktopMediaPickerViews::~DesktopMediaPickerViews() {
 616   if (dialog_) {
 617     dialog_->DetachParent();
 618     dialog_->GetWidget()->Close();
 619   }
 620 }
 621
 622 void DesktopMediaPickerViews::Show(gfx::NativeWindow context,
 623                                    gfx::NativeWindow parent,
 624                                    const base::string16& app_name,
 625                                    const base::string16& target_name,
 626                                    scoped_ptr<DesktopMediaList> media_list,
 627                                    const DoneCallback& done_callback) {
 628   callback_ = done_callback;
 629   dialog_ = new DesktopMediaPickerDialogView(
 630       context, parent, this, app_name, target_name, media_list.Pass());
 631 }
 632
 633 void DesktopMediaPickerViews::NotifyDialogResult(
 634     DesktopMediaID source) {
 635   // Once this method is called the |dialog_| will close and destroy itself.
 636   dialog_->DetachParent();
 637   dialog_ = NULL;
 638
 639   DCHECK(!callback_.is_null());
 640
 641   // Notify the |callback_| asynchronously because it may need to destroy
 642   // DesktopMediaPicker.
 643   content::BrowserThread::PostTask(
 644       content::BrowserThread::UI, FROM_HERE,
 645       base::Bind(callback_, source));
 646   callback_.Reset();
 647 }
 648
 649 }  // namespace
 650
 651 // static
 652 scoped_ptr<DesktopMediaPicker> DesktopMediaPicker::Create() {
 653   return scoped_ptr<DesktopMediaPicker>(new DesktopMediaPickerViews());
 654 }