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      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 "ui/views/controls/menu/menu_item_view.h"
      6 
      7 #include "base/i18n/case_conversion.h"
      8 #include "base/stl_util.h"
      9 #include "base/strings/utf_string_conversions.h"
     10 #include "grit/ui_resources.h"
     11 #include "grit/ui_strings.h"
     12 #include "ui/base/accessibility/accessible_view_state.h"
     13 #include "ui/base/l10n/l10n_util.h"
     14 #include "ui/base/models/menu_model.h"
     15 #include "ui/base/resource/resource_bundle.h"
     16 #include "ui/gfx/canvas.h"
     17 #include "ui/gfx/image/image.h"
     18 #include "ui/native_theme/common_theme.h"
     19 #include "ui/views/controls/button/menu_button.h"
     20 #include "ui/views/controls/image_view.h"
     21 #include "ui/views/controls/menu/menu_config.h"
     22 #include "ui/views/controls/menu/menu_controller.h"
     23 #include "ui/views/controls/menu/menu_image_util.h"
     24 #include "ui/views/controls/menu/menu_scroll_view_container.h"
     25 #include "ui/views/controls/menu/menu_separator.h"
     26 #include "ui/views/controls/menu/submenu_view.h"
     27 #include "ui/views/widget/widget.h"
     28 
     29 namespace views {
     30 
     31 namespace {
     32 
     33 // EmptyMenuMenuItem ---------------------------------------------------------
     34 
     35 // EmptyMenuMenuItem is used when a menu has no menu items. EmptyMenuMenuItem
     36 // is itself a MenuItemView, but it uses a different ID so that it isn't
     37 // identified as a MenuItemView.
     38 
     39 class EmptyMenuMenuItem : public MenuItemView {
     40  public:
     41   explicit EmptyMenuMenuItem(MenuItemView* parent)
     42       : MenuItemView(parent, 0, EMPTY) {
     43     // Set this so that we're not identified as a normal menu item.
     44     set_id(kEmptyMenuItemViewID);
     45     SetTitle(l10n_util::GetStringUTF16(IDS_APP_MENU_EMPTY_SUBMENU));
     46     SetEnabled(false);
     47   }
     48 
     49   virtual bool GetTooltipText(const gfx::Point& p,
     50                               string16* tooltip) const OVERRIDE {
     51     // Empty menu items shouldn't have a tooltip.
     52     return false;
     53   }
     54 
     55  private:
     56   DISALLOW_COPY_AND_ASSIGN(EmptyMenuMenuItem);
     57 };
     58 
     59 }  // namespace
     60 
     61 // Padding between child views.
     62 static const int kChildXPadding = 8;
     63 
     64 // MenuItemView ---------------------------------------------------------------
     65 
     66 // static
     67 const int MenuItemView::kMenuItemViewID = 1001;
     68 
     69 // static
     70 const int MenuItemView::kEmptyMenuItemViewID =
     71     MenuItemView::kMenuItemViewID + 1;
     72 
     73 // static
     74 int MenuItemView::icon_area_width_ = 0;
     75 
     76 // static
     77 int MenuItemView::label_start_;
     78 
     79 // static
     80 int MenuItemView::item_right_margin_;
     81 
     82 // static
     83 int MenuItemView::pref_menu_height_;
     84 
     85 // static
     86 const char MenuItemView::kViewClassName[] = "MenuItemView";
     87 
     88 MenuItemView::MenuItemView(MenuDelegate* delegate)
     89     : delegate_(delegate),
     90       controller_(NULL),
     91       canceled_(false),
     92       parent_menu_item_(NULL),
     93       type_(SUBMENU),
     94       selected_(false),
     95       command_(0),
     96       submenu_(NULL),
     97       has_mnemonics_(false),
     98       show_mnemonics_(false),
     99       has_icons_(false),
    100       icon_view_(NULL),
    101       top_margin_(-1),
    102       bottom_margin_(-1),
    103       left_icon_margin_(0),
    104       right_icon_margin_(0),
    105       requested_menu_position_(POSITION_BEST_FIT),
    106       actual_menu_position_(requested_menu_position_),
    107       use_right_margin_(true) {
    108   // NOTE: don't check the delegate for NULL, UpdateMenuPartSizes() supplies a
    109   // NULL delegate.
    110   Init(NULL, 0, SUBMENU, delegate);
    111 }
    112 
    113 void MenuItemView::ChildPreferredSizeChanged(View* child) {
    114   invalidate_dimensions();
    115   PreferredSizeChanged();
    116 }
    117 
    118 bool MenuItemView::GetTooltipText(const gfx::Point& p,
    119                                   string16* tooltip) const {
    120   *tooltip = tooltip_;
    121   if (!tooltip->empty())
    122     return true;
    123 
    124   if (GetType() == SEPARATOR)
    125     return false;
    126 
    127   const MenuController* controller = GetMenuController();
    128   if (!controller || controller->exit_type() != MenuController::EXIT_NONE) {
    129     // Either the menu has been closed or we're in the process of closing the
    130     // menu. Don't attempt to query the delegate as it may no longer be valid.
    131     return false;
    132   }
    133 
    134   const MenuItemView* root_menu_item = GetRootMenuItem();
    135   if (root_menu_item->canceled_) {
    136     // TODO(sky): if |canceled_| is true, controller->exit_type() should be
    137     // something other than EXIT_NONE, but crash reports seem to indicate
    138     // otherwise. Figure out why this is needed.
    139     return false;
    140   }
    141 
    142   const MenuDelegate* delegate = GetDelegate();
    143   CHECK(delegate);
    144   gfx::Point location(p);
    145   ConvertPointToScreen(this, &location);
    146   *tooltip = delegate->GetTooltipText(command_, location);
    147   return !tooltip->empty();
    148 }
    149 
    150 void MenuItemView::GetAccessibleState(ui::AccessibleViewState* state) {
    151   state->role = ui::AccessibilityTypes::ROLE_MENUITEM;
    152 
    153   string16 item_text;
    154   if (IsContainer()) {
    155     // The first child is taking over, just use its accessible name instead of
    156     // |title_|.
    157     View* child = child_at(0);
    158     ui::AccessibleViewState state;
    159     child->GetAccessibleState(&state);
    160     item_text = state.name;
    161   } else {
    162     item_text = title_;
    163   }
    164   state->name = GetAccessibleNameForMenuItem(item_text, GetMinorText());
    165 
    166   switch (GetType()) {
    167     case SUBMENU:
    168       state->state |= ui::AccessibilityTypes::STATE_HASPOPUP;
    169       break;
    170     case CHECKBOX:
    171     case RADIO:
    172       state->state |= GetDelegate()->IsItemChecked(GetCommand()) ?
    173           ui::AccessibilityTypes::STATE_CHECKED : 0;
    174       break;
    175     case NORMAL:
    176     case SEPARATOR:
    177     case EMPTY:
    178       // No additional accessibility states currently for these menu states.
    179       break;
    180   }
    181 }
    182 
    183 // static
    184 bool MenuItemView::IsBubble(MenuItemView::AnchorPosition anchor) {
    185   return anchor == MenuItemView::BUBBLE_LEFT ||
    186          anchor == MenuItemView::BUBBLE_RIGHT ||
    187          anchor == MenuItemView::BUBBLE_ABOVE ||
    188          anchor == MenuItemView::BUBBLE_BELOW;
    189 }
    190 
    191 // static
    192 string16 MenuItemView::GetAccessibleNameForMenuItem(
    193       const string16& item_text, const string16& minor_text) {
    194   string16 accessible_name = item_text;
    195 
    196   // Filter out the "&" for accessibility clients.
    197   size_t index = 0;
    198   const char16 amp = '&';
    199   while ((index = accessible_name.find(amp, index)) != string16::npos &&
    200          index + 1 < accessible_name.length()) {
    201     accessible_name.replace(index, accessible_name.length() - index,
    202                             accessible_name.substr(index + 1));
    203 
    204     // Special case for "&&" (escaped for "&").
    205     if (accessible_name[index] == '&')
    206       ++index;
    207   }
    208 
    209   // Append subtext.
    210   if (!minor_text.empty()) {
    211     accessible_name.push_back(' ');
    212     accessible_name.append(minor_text);
    213   }
    214 
    215   return accessible_name;
    216 }
    217 
    218 void MenuItemView::Cancel() {
    219   if (controller_ && !canceled_) {
    220     canceled_ = true;
    221     controller_->Cancel(MenuController::EXIT_ALL);
    222   }
    223 }
    224 
    225 MenuItemView* MenuItemView::AddMenuItemAt(
    226     int index,
    227     int item_id,
    228     const string16& label,
    229     const string16& sublabel,
    230     const string16& minor_text,
    231     const gfx::ImageSkia& icon,
    232     Type type,
    233     ui::MenuSeparatorType separator_style) {
    234   DCHECK_NE(type, EMPTY);
    235   DCHECK_LE(0, index);
    236   if (!submenu_)
    237     CreateSubmenu();
    238   DCHECK_GE(submenu_->child_count(), index);
    239   if (type == SEPARATOR) {
    240     submenu_->AddChildViewAt(new MenuSeparator(this, separator_style), index);
    241     return NULL;
    242   }
    243   MenuItemView* item = new MenuItemView(this, item_id, type);
    244   if (label.empty() && GetDelegate())
    245     item->SetTitle(GetDelegate()->GetLabel(item_id));
    246   else
    247     item->SetTitle(label);
    248   item->SetSubtitle(sublabel);
    249   item->SetMinorText(minor_text);
    250   if (!icon.isNull())
    251     item->SetIcon(icon);
    252   if (type == SUBMENU)
    253     item->CreateSubmenu();
    254   submenu_->AddChildViewAt(item, index);
    255   return item;
    256 }
    257 
    258 void MenuItemView::RemoveMenuItemAt(int index) {
    259   DCHECK(submenu_);
    260   DCHECK_LE(0, index);
    261   DCHECK_GT(submenu_->child_count(), index);
    262 
    263   View* item = submenu_->child_at(index);
    264   DCHECK(item);
    265   submenu_->RemoveChildView(item);
    266 
    267   // RemoveChildView() does not delete the item, which is a good thing
    268   // in case a submenu is being displayed while items are being removed.
    269   // Deletion will be done by ChildrenChanged() or at destruction.
    270   removed_items_.push_back(item);
    271 }
    272 
    273 MenuItemView* MenuItemView::AppendMenuItem(int item_id,
    274                                            const string16& label,
    275                                            Type type) {
    276   return AppendMenuItemImpl(item_id, label, string16(), string16(),
    277       gfx::ImageSkia(), type, ui::NORMAL_SEPARATOR);
    278 }
    279 
    280 MenuItemView* MenuItemView::AppendSubMenu(int item_id,
    281                                           const string16& label) {
    282   return AppendMenuItemImpl(item_id, label, string16(), string16(),
    283       gfx::ImageSkia(), SUBMENU, ui::NORMAL_SEPARATOR);
    284 }
    285 
    286 MenuItemView* MenuItemView::AppendSubMenuWithIcon(int item_id,
    287                                                   const string16& label,
    288                                                   const gfx::ImageSkia& icon) {
    289   return AppendMenuItemImpl(item_id, label, string16(), string16(), icon,
    290       SUBMENU, ui::NORMAL_SEPARATOR);
    291 }
    292 
    293 MenuItemView* MenuItemView::AppendMenuItemWithLabel(int item_id,
    294                                                     const string16& label) {
    295   return AppendMenuItem(item_id, label, NORMAL);
    296 }
    297 
    298 MenuItemView* MenuItemView::AppendDelegateMenuItem(int item_id) {
    299   return AppendMenuItem(item_id, string16(), NORMAL);
    300 }
    301 
    302 void MenuItemView::AppendSeparator() {
    303   AppendMenuItemImpl(0, string16(), string16(), string16(), gfx::ImageSkia(),
    304                      SEPARATOR, ui::NORMAL_SEPARATOR);
    305 }
    306 
    307 MenuItemView* MenuItemView::AppendMenuItemWithIcon(int item_id,
    308                                                    const string16& label,
    309                                                    const gfx::ImageSkia& icon) {
    310   return AppendMenuItemImpl(item_id, label, string16(), string16(), icon,
    311       NORMAL, ui::NORMAL_SEPARATOR);
    312 }
    313 
    314 MenuItemView* MenuItemView::AppendMenuItemImpl(
    315     int item_id,
    316     const string16& label,
    317     const string16& sublabel,
    318     const string16& minor_text,
    319     const gfx::ImageSkia& icon,
    320     Type type,
    321     ui::MenuSeparatorType separator_style) {
    322   const int index = submenu_ ? submenu_->child_count() : 0;
    323   return AddMenuItemAt(index, item_id, label, sublabel, minor_text, icon, type,
    324                        separator_style);
    325 }
    326 
    327 SubmenuView* MenuItemView::CreateSubmenu() {
    328   if (!submenu_)
    329     submenu_ = new SubmenuView(this);
    330   return submenu_;
    331 }
    332 
    333 bool MenuItemView::HasSubmenu() const {
    334   return (submenu_ != NULL);
    335 }
    336 
    337 SubmenuView* MenuItemView::GetSubmenu() const {
    338   return submenu_;
    339 }
    340 
    341 void MenuItemView::SetTitle(const string16& title) {
    342   title_ = title;
    343   invalidate_dimensions();  // Triggers preferred size recalculation.
    344 }
    345 
    346 void MenuItemView::SetSubtitle(const string16& subtitle) {
    347   subtitle_ = subtitle;
    348   invalidate_dimensions();  // Triggers preferred size recalculation.
    349 }
    350 
    351 void MenuItemView::SetMinorText(const string16& minor_text) {
    352   minor_text_ = minor_text;
    353   invalidate_dimensions();  // Triggers preferred size recalculation.
    354 }
    355 
    356 void MenuItemView::SetSelected(bool selected) {
    357   selected_ = selected;
    358   SchedulePaint();
    359 }
    360 
    361 void MenuItemView::SetTooltip(const string16& tooltip, int item_id) {
    362   MenuItemView* item = GetMenuItemByID(item_id);
    363   DCHECK(item);
    364   item->tooltip_ = tooltip;
    365 }
    366 
    367 void MenuItemView::SetIcon(const gfx::ImageSkia& icon, int item_id) {
    368   MenuItemView* item = GetMenuItemByID(item_id);
    369   DCHECK(item);
    370   item->SetIcon(icon);
    371 }
    372 
    373 void MenuItemView::SetIcon(const gfx::ImageSkia& icon) {
    374   if (icon.isNull()) {
    375     SetIconView(NULL);
    376     return;
    377   }
    378 
    379   ImageView* icon_view = new ImageView();
    380   icon_view->SetImage(&icon);
    381   SetIconView(icon_view);
    382 }
    383 
    384 void MenuItemView::SetIconView(View* icon_view) {
    385   if (icon_view_) {
    386     RemoveChildView(icon_view_);
    387     delete icon_view_;
    388     icon_view_ = NULL;
    389   }
    390   if (icon_view) {
    391     AddChildView(icon_view);
    392     icon_view_ = icon_view;
    393   }
    394   Layout();
    395   SchedulePaint();
    396 }
    397 
    398 void MenuItemView::OnPaint(gfx::Canvas* canvas) {
    399   PaintButton(canvas, PB_NORMAL);
    400 }
    401 
    402 gfx::Size MenuItemView::GetPreferredSize() {
    403   const MenuItemDimensions& dimensions(GetDimensions());
    404   return gfx::Size(dimensions.standard_width + dimensions.children_width,
    405                    dimensions.height);
    406 }
    407 
    408 const MenuItemView::MenuItemDimensions& MenuItemView::GetDimensions() {
    409   if (!is_dimensions_valid())
    410     dimensions_ = CalculateDimensions();
    411   DCHECK(is_dimensions_valid());
    412   return dimensions_;
    413 }
    414 
    415 MenuController* MenuItemView::GetMenuController() {
    416   return GetRootMenuItem()->controller_;
    417 }
    418 
    419 const MenuController* MenuItemView::GetMenuController() const {
    420   return GetRootMenuItem()->controller_;
    421 }
    422 
    423 MenuDelegate* MenuItemView::GetDelegate() {
    424   return GetRootMenuItem()->delegate_;
    425 }
    426 
    427 const MenuDelegate* MenuItemView::GetDelegate() const {
    428   return GetRootMenuItem()->delegate_;
    429 }
    430 
    431 MenuItemView* MenuItemView::GetRootMenuItem() {
    432   return const_cast<MenuItemView*>(
    433       static_cast<const MenuItemView*>(this)->GetRootMenuItem());
    434 }
    435 
    436 const MenuItemView* MenuItemView::GetRootMenuItem() const {
    437   const MenuItemView* item = this;
    438   for (const MenuItemView* parent = GetParentMenuItem(); parent;
    439        parent = item->GetParentMenuItem())
    440     item = parent;
    441   return item;
    442 }
    443 
    444 char16 MenuItemView::GetMnemonic() {
    445   if (!GetRootMenuItem()->has_mnemonics_)
    446     return 0;
    447 
    448   size_t index = 0;
    449   do {
    450     index = title_.find('&', index);
    451     if (index != string16::npos) {
    452       if (index + 1 != title_.size() && title_[index + 1] != '&') {
    453         char16 char_array[] = { title_[index + 1], 0 };
    454         // TODO(jshin): What about Turkish locale? See http://crbug.com/81719.
    455         // If the mnemonic is capital I and the UI language is Turkish,
    456         // lowercasing it results in 'small dotless i', which is different
    457         // from a 'dotted i'. Similar issues may exist for az and lt locales.
    458         return base::i18n::ToLower(char_array)[0];
    459       }
    460       index++;
    461     }
    462   } while (index != string16::npos);
    463   return 0;
    464 }
    465 
    466 MenuItemView* MenuItemView::GetMenuItemByID(int id) {
    467   if (GetCommand() == id)
    468     return this;
    469   if (!HasSubmenu())
    470     return NULL;
    471   for (int i = 0; i < GetSubmenu()->child_count(); ++i) {
    472     View* child = GetSubmenu()->child_at(i);
    473     if (child->id() == MenuItemView::kMenuItemViewID) {
    474       MenuItemView* result = static_cast<MenuItemView*>(child)->
    475           GetMenuItemByID(id);
    476       if (result)
    477         return result;
    478     }
    479   }
    480   return NULL;
    481 }
    482 
    483 void MenuItemView::ChildrenChanged() {
    484   MenuController* controller = GetMenuController();
    485   if (controller) {
    486     // Handles the case where we were empty and are no longer empty.
    487     RemoveEmptyMenus();
    488 
    489     // Handles the case where we were not empty, but now are.
    490     AddEmptyMenus();
    491 
    492     controller->MenuChildrenChanged(this);
    493 
    494     if (submenu_) {
    495       // Force a paint and layout. This handles the case of the top
    496       // level window's size remaining the same, resulting in no
    497       // change to the submenu's size and no layout.
    498       submenu_->Layout();
    499       submenu_->SchedulePaint();
    500       // Update the menu selection after layout.
    501       controller->UpdateSubmenuSelection(submenu_);
    502     }
    503   }
    504 
    505   STLDeleteElements(&removed_items_);
    506 }
    507 
    508 void MenuItemView::Layout() {
    509   if (!has_children())
    510     return;
    511 
    512   if (IsContainer()) {
    513     View* child = child_at(0);
    514     gfx::Size size = child->GetPreferredSize();
    515     child->SetBounds(0, GetTopMargin(), size.width(), size.height());
    516   } else {
    517     // Child views are laid out right aligned and given the full height. To
    518     // right align start with the last view and progress to the first.
    519     int x = width() - (use_right_margin_ ? item_right_margin_ : 0);
    520     for (int i = child_count() - 1; i >= 0; --i) {
    521       View* child = child_at(i);
    522       if (icon_view_ && (icon_view_ == child))
    523         continue;
    524       int width = child->GetPreferredSize().width();
    525       child->SetBounds(x - width, 0, width, height());
    526       x -= width - kChildXPadding;
    527     }
    528     // Position |icon_view|.
    529     const MenuConfig& config = GetMenuConfig();
    530     if (icon_view_) {
    531       icon_view_->SizeToPreferredSize();
    532       gfx::Size size = icon_view_->GetPreferredSize();
    533       int x = config.item_left_margin + left_icon_margin_ +
    534               (icon_area_width_ - size.width()) / 2;
    535       if (type_ == CHECKBOX || type_ == RADIO)
    536         x = label_start_;
    537       int y =
    538           (height() + GetTopMargin() - GetBottomMargin() - size.height()) / 2;
    539       icon_view_->SetPosition(gfx::Point(x, y));
    540     }
    541   }
    542 }
    543 
    544 void MenuItemView::SetMargins(int top_margin, int bottom_margin) {
    545   top_margin_ = top_margin;
    546   bottom_margin_ = bottom_margin;
    547 
    548   invalidate_dimensions();
    549 }
    550 
    551 const MenuConfig& MenuItemView::GetMenuConfig() const {
    552   const MenuController* controller = GetMenuController();
    553   if (controller)
    554     return controller->menu_config_;
    555   return MenuConfig::instance(NULL);
    556 }
    557 
    558 MenuItemView::MenuItemView(MenuItemView* parent,
    559                            int command,
    560                            MenuItemView::Type type)
    561     : delegate_(NULL),
    562       controller_(NULL),
    563       canceled_(false),
    564       parent_menu_item_(parent),
    565       type_(type),
    566       selected_(false),
    567       command_(command),
    568       submenu_(NULL),
    569       has_mnemonics_(false),
    570       show_mnemonics_(false),
    571       has_icons_(false),
    572       icon_view_(NULL),
    573       top_margin_(-1),
    574       bottom_margin_(-1),
    575       left_icon_margin_(0),
    576       right_icon_margin_(0),
    577       requested_menu_position_(POSITION_BEST_FIT),
    578       actual_menu_position_(requested_menu_position_),
    579       use_right_margin_(true) {
    580   Init(parent, command, type, NULL);
    581 }
    582 
    583 MenuItemView::~MenuItemView() {
    584   delete submenu_;
    585   STLDeleteElements(&removed_items_);
    586 }
    587 
    588 const char* MenuItemView::GetClassName() const {
    589   return kViewClassName;
    590 }
    591 
    592 // Calculates all sizes that we can from the OS.
    593 //
    594 // This is invoked prior to Running a menu.
    595 void MenuItemView::UpdateMenuPartSizes() {
    596   const MenuConfig& config = GetMenuConfig();
    597 
    598   item_right_margin_ = config.label_to_arrow_padding + config.arrow_width +
    599                        config.arrow_to_edge_padding;
    600   icon_area_width_ = config.check_width;
    601   if (has_icons_)
    602     icon_area_width_ = std::max(icon_area_width_, GetMaxIconViewWidth());
    603 
    604   label_start_ = config.item_left_margin + icon_area_width_;
    605   int padding = 0;
    606   if (config.always_use_icon_to_label_padding) {
    607     padding = config.icon_to_label_padding;
    608   } else if (config.render_gutter) {
    609     padding = config.item_left_margin;
    610   } else {
    611     padding = (has_icons_ || HasChecksOrRadioButtons()) ?
    612         config.icon_to_label_padding : 0;
    613   }
    614   label_start_ += padding;
    615 
    616   if (config.render_gutter)
    617     label_start_ += config.gutter_width + config.gutter_to_label;
    618 
    619   EmptyMenuMenuItem menu_item(this);
    620   menu_item.set_controller(GetMenuController());
    621   pref_menu_height_ = menu_item.GetPreferredSize().height();
    622 }
    623 
    624 void MenuItemView::Init(MenuItemView* parent,
    625                         int command,
    626                         MenuItemView::Type type,
    627                         MenuDelegate* delegate) {
    628   delegate_ = delegate;
    629   controller_ = NULL;
    630   canceled_ = false;
    631   parent_menu_item_ = parent;
    632   type_ = type;
    633   selected_ = false;
    634   command_ = command;
    635   submenu_ = NULL;
    636   show_mnemonics_ = false;
    637   // Assign our ID, this allows SubmenuItemView to find MenuItemViews.
    638   set_id(kMenuItemViewID);
    639   has_icons_ = false;
    640 
    641   // Don't request enabled status from the root menu item as it is just
    642   // a container for real items.  EMPTY items will be disabled.
    643   MenuDelegate* root_delegate = GetDelegate();
    644   if (parent && type != EMPTY && root_delegate)
    645     SetEnabled(root_delegate->IsCommandEnabled(command));
    646 }
    647 
    648 void MenuItemView::PrepareForRun(bool is_first_menu,
    649                                  bool has_mnemonics,
    650                                  bool show_mnemonics) {
    651   // Currently we only support showing the root.
    652   DCHECK(!parent_menu_item_);
    653 
    654   // Force us to have a submenu.
    655   CreateSubmenu();
    656   actual_menu_position_ = requested_menu_position_;
    657   canceled_ = false;
    658 
    659   has_mnemonics_ = has_mnemonics;
    660   show_mnemonics_ = has_mnemonics && show_mnemonics;
    661 
    662   AddEmptyMenus();
    663 
    664   if (is_first_menu) {
    665     // Only update the menu size if there are no menus showing, otherwise
    666     // things may shift around.
    667     UpdateMenuPartSizes();
    668   }
    669 }
    670 
    671 int MenuItemView::GetDrawStringFlags() {
    672   int flags = 0;
    673   if (base::i18n::IsRTL())
    674     flags |= gfx::Canvas::TEXT_ALIGN_RIGHT;
    675   else
    676     flags |= gfx::Canvas::TEXT_ALIGN_LEFT;
    677 
    678   if (GetRootMenuItem()->has_mnemonics_) {
    679     if (GetMenuConfig().show_mnemonics || GetRootMenuItem()->show_mnemonics_) {
    680       flags |= gfx::Canvas::SHOW_PREFIX;
    681     } else {
    682       flags |= gfx::Canvas::HIDE_PREFIX;
    683     }
    684   }
    685   return flags;
    686 }
    687 
    688 const gfx::Font& MenuItemView::GetFont() {
    689   const MenuDelegate* delegate = GetDelegate();
    690   if (delegate) {
    691     const gfx::Font* font = delegate->GetLabelFont(GetCommand());
    692     if (font)
    693       return *font;
    694   }
    695   return GetMenuConfig().font;
    696 }
    697 
    698 void MenuItemView::AddEmptyMenus() {
    699   DCHECK(HasSubmenu());
    700   if (!submenu_->has_children()) {
    701     submenu_->AddChildViewAt(new EmptyMenuMenuItem(this), 0);
    702   } else {
    703     for (int i = 0, item_count = submenu_->GetMenuItemCount(); i < item_count;
    704          ++i) {
    705       MenuItemView* child = submenu_->GetMenuItemAt(i);
    706       if (child->HasSubmenu())
    707         child->AddEmptyMenus();
    708     }
    709   }
    710 }
    711 
    712 void MenuItemView::RemoveEmptyMenus() {
    713   DCHECK(HasSubmenu());
    714   // Iterate backwards as we may end up removing views, which alters the child
    715   // view count.
    716   for (int i = submenu_->child_count() - 1; i >= 0; --i) {
    717     View* child = submenu_->child_at(i);
    718     if (child->id() == MenuItemView::kMenuItemViewID) {
    719       MenuItemView* menu_item = static_cast<MenuItemView*>(child);
    720       if (menu_item->HasSubmenu())
    721         menu_item->RemoveEmptyMenus();
    722     } else if (child->id() == EmptyMenuMenuItem::kEmptyMenuItemViewID) {
    723       submenu_->RemoveChildView(child);
    724       delete child;
    725       child = NULL;
    726     }
    727   }
    728 }
    729 
    730 void MenuItemView::AdjustBoundsForRTLUI(gfx::Rect* rect) const {
    731   rect->set_x(GetMirroredXForRect(*rect));
    732 }
    733 
    734 void MenuItemView::PaintButton(gfx::Canvas* canvas, PaintButtonMode mode) {
    735   const MenuConfig& config = GetMenuConfig();
    736   bool render_selection =
    737       (mode == PB_NORMAL && IsSelected() &&
    738        parent_menu_item_->GetSubmenu()->GetShowSelection(this) &&
    739        (NonIconChildViewsCount() == 0));
    740 
    741   int icon_x = config.item_left_margin + left_icon_margin_;
    742   int top_margin = GetTopMargin();
    743   int bottom_margin = GetBottomMargin();
    744   int icon_y = top_margin + (height() - config.item_top_margin -
    745                              bottom_margin - config.check_height) / 2;
    746   int icon_height = config.check_height;
    747   int available_height = height() - top_margin - bottom_margin;
    748   MenuDelegate *delegate = GetDelegate();
    749   // Render the background. As MenuScrollViewContainer draws the background, we
    750   // only need the background when we want it to look different, as when we're
    751   // selected.
    752   ui::NativeTheme* native_theme = GetNativeTheme();
    753   SkColor override_color;
    754   if (delegate && delegate->GetBackgroundColor(GetCommand(),
    755                                                render_selection,
    756                                                &override_color)) {
    757     canvas->DrawColor(override_color);
    758   } else if (render_selection) {
    759     gfx::Rect item_bounds(0, 0, width(), height());
    760     AdjustBoundsForRTLUI(&item_bounds);
    761 
    762     native_theme->Paint(canvas->sk_canvas(),
    763                         ui::NativeTheme::kMenuItemBackground,
    764                         ui::NativeTheme::kHovered,
    765                         item_bounds,
    766                         ui::NativeTheme::ExtraParams());
    767   }
    768 
    769   // Render the check.
    770   if (type_ == CHECKBOX && delegate->IsItemChecked(GetCommand())) {
    771     gfx::ImageSkia check = GetMenuCheckImage(IsSelected());
    772     // Don't use config.check_width here as it's padded
    773     // to force more padding (AURA).
    774     gfx::Rect check_bounds(icon_x, icon_y, check.width(), icon_height);
    775     AdjustBoundsForRTLUI(&check_bounds);
    776     canvas->DrawImageInt(check, check_bounds.x(), check_bounds.y());
    777   } else if (type_ == RADIO) {
    778     gfx::ImageSkia image =
    779         GetRadioButtonImage(delegate->IsItemChecked(GetCommand()));
    780     gfx::Rect radio_bounds(icon_x,
    781                            top_margin +
    782                            (height() - top_margin - bottom_margin -
    783                                image.height()) / 2,
    784                            image.width(),
    785                            image.height());
    786     AdjustBoundsForRTLUI(&radio_bounds);
    787     canvas->DrawImageInt(image, radio_bounds.x(), radio_bounds.y());
    788   }
    789 
    790   // Render the foreground.
    791   ui::NativeTheme::ColorId color_id =
    792       ui::NativeTheme::kColorId_DisabledMenuItemForegroundColor;
    793   if (enabled()) {
    794     color_id = render_selection ?
    795         ui::NativeTheme::kColorId_SelectedMenuItemForegroundColor:
    796         ui::NativeTheme::kColorId_EnabledMenuItemForegroundColor;
    797   }
    798   SkColor fg_color = native_theme->GetSystemColor(color_id);
    799   SkColor override_foreground_color;
    800   if (delegate && delegate->GetForegroundColor(GetCommand(),
    801                                                render_selection,
    802                                                &override_foreground_color))
    803     fg_color = override_foreground_color;
    804 
    805   const gfx::Font& font = GetFont();
    806   int accel_width = parent_menu_item_->GetSubmenu()->max_minor_text_width();
    807   int label_start = GetLabelStartForThisItem();
    808 
    809   int width = this->width() - label_start - accel_width -
    810       (!delegate ||
    811        delegate->ShouldReserveSpaceForSubmenuIndicator() ?
    812            item_right_margin_ : config.arrow_to_edge_padding);
    813   gfx::Rect text_bounds(label_start, top_margin, width,
    814                         subtitle_.empty() ? available_height
    815                                           : available_height / 2);
    816   text_bounds.set_x(GetMirroredXForRect(text_bounds));
    817   int flags = GetDrawStringFlags();
    818   if (mode == PB_FOR_DRAG)
    819     flags |= gfx::Canvas::NO_SUBPIXEL_RENDERING;
    820   canvas->DrawStringInt(title(), font, fg_color,
    821                         text_bounds.x(), text_bounds.y(), text_bounds.width(),
    822                         text_bounds.height(), flags);
    823   if (!subtitle_.empty()) {
    824     canvas->DrawStringInt(
    825         subtitle_,
    826         font,
    827         GetNativeTheme()->GetSystemColor(
    828             ui::NativeTheme::kColorId_ButtonDisabledColor),
    829         text_bounds.x(),
    830         text_bounds.y() + GetFont().GetHeight(),
    831         text_bounds.width(),
    832         text_bounds.height(),
    833         flags);
    834   }
    835 
    836   PaintMinorText(canvas, render_selection);
    837 
    838   // Render the submenu indicator (arrow).
    839   if (HasSubmenu()) {
    840     gfx::Rect arrow_bounds(this->width() - config.arrow_width -
    841                                config.arrow_to_edge_padding,
    842                            top_margin + (available_height -
    843                                          config.arrow_width) / 2,
    844                            config.arrow_width, height());
    845     AdjustBoundsForRTLUI(&arrow_bounds);
    846     canvas->DrawImageInt(GetSubmenuArrowImage(IsSelected()),
    847                          arrow_bounds.x(), arrow_bounds.y());
    848   }
    849 }
    850 
    851 void MenuItemView::PaintMinorText(gfx::Canvas* canvas,
    852                                   bool render_selection) {
    853   string16 minor_text = GetMinorText();
    854   if (minor_text.empty())
    855     return;
    856 
    857   const gfx::Font& font = GetFont();
    858   int available_height = height() - GetTopMargin() - GetBottomMargin();
    859   int max_accel_width =
    860       parent_menu_item_->GetSubmenu()->max_minor_text_width();
    861   const MenuConfig& config = GetMenuConfig();
    862   int accel_right_margin = config.align_arrow_and_shortcut ?
    863                            config.arrow_to_edge_padding :  item_right_margin_;
    864   gfx::Rect accel_bounds(width() - accel_right_margin - max_accel_width,
    865                          GetTopMargin(), max_accel_width, available_height);
    866   accel_bounds.set_x(GetMirroredXForRect(accel_bounds));
    867   int flags = GetDrawStringFlags();
    868   flags &= ~(gfx::Canvas::TEXT_ALIGN_RIGHT | gfx::Canvas::TEXT_ALIGN_LEFT);
    869   if (base::i18n::IsRTL())
    870     flags |= gfx::Canvas::TEXT_ALIGN_LEFT;
    871   else
    872     flags |= gfx::Canvas::TEXT_ALIGN_RIGHT;
    873   canvas->DrawStringInt(
    874       minor_text,
    875       font,
    876       GetNativeTheme()->GetSystemColor(render_selection ?
    877           ui::NativeTheme::kColorId_SelectedMenuItemForegroundColor :
    878           ui::NativeTheme::kColorId_ButtonDisabledColor),
    879       accel_bounds.x(),
    880       accel_bounds.y(),
    881       accel_bounds.width(),
    882       accel_bounds.height(),
    883       flags);
    884 }
    885 
    886 void MenuItemView::DestroyAllMenuHosts() {
    887   if (!HasSubmenu())
    888     return;
    889 
    890   submenu_->Close();
    891   for (int i = 0, item_count = submenu_->GetMenuItemCount(); i < item_count;
    892        ++i) {
    893     submenu_->GetMenuItemAt(i)->DestroyAllMenuHosts();
    894   }
    895 }
    896 
    897 int MenuItemView::GetTopMargin() {
    898   if (top_margin_ >= 0)
    899     return top_margin_;
    900 
    901   MenuItemView* root = GetRootMenuItem();
    902   return root && root->has_icons_
    903       ? GetMenuConfig().item_top_margin :
    904         GetMenuConfig().item_no_icon_top_margin;
    905 }
    906 
    907 int MenuItemView::GetBottomMargin() {
    908   if (bottom_margin_ >= 0)
    909     return bottom_margin_;
    910 
    911   MenuItemView* root = GetRootMenuItem();
    912   return root && root->has_icons_
    913       ? GetMenuConfig().item_bottom_margin :
    914         GetMenuConfig().item_no_icon_bottom_margin;
    915 }
    916 
    917 gfx::Size MenuItemView::GetChildPreferredSize() {
    918   if (!has_children())
    919     return gfx::Size();
    920 
    921   if (IsContainer()) {
    922     View* child = child_at(0);
    923     return child->GetPreferredSize();
    924   }
    925 
    926   int width = 0;
    927   for (int i = 0; i < child_count(); ++i) {
    928     View* child = child_at(i);
    929     if (icon_view_ && (icon_view_ == child))
    930       continue;
    931     if (i)
    932       width += kChildXPadding;
    933     width += child->GetPreferredSize().width();
    934   }
    935   int height = 0;
    936   if (icon_view_)
    937     height = icon_view_->GetPreferredSize().height();
    938 
    939   // If there is no icon view it returns a height of 0 to indicate that
    940   // we should use the title height instead.
    941   return gfx::Size(width, height);
    942 }
    943 
    944 MenuItemView::MenuItemDimensions MenuItemView::CalculateDimensions() {
    945   gfx::Size child_size = GetChildPreferredSize();
    946 
    947   MenuItemDimensions dimensions;
    948   // Get the container height.
    949   dimensions.children_width = child_size.width();
    950   dimensions.height = child_size.height();
    951   // Adjust item content height if menu has both items with and without icons.
    952   // This way all menu items will have the same height.
    953   if (!icon_view_ && GetRootMenuItem()->has_icons()) {
    954     dimensions.height = std::max(dimensions.height,
    955                                  GetMenuConfig().check_height);
    956   }
    957   dimensions.height += GetBottomMargin() + GetTopMargin();
    958 
    959   // In case of a container, only the container size needs to be filled.
    960   if (IsContainer())
    961     return dimensions;
    962 
    963   // Determine the length of the label text.
    964   const gfx::Font& font = GetFont();
    965 
    966   // Get Icon margin overrides for this particular item.
    967   const MenuDelegate* delegate = GetDelegate();
    968   if (delegate) {
    969     delegate->GetHorizontalIconMargins(command_,
    970                                        icon_area_width_,
    971                                        &left_icon_margin_,
    972                                        &right_icon_margin_);
    973   } else {
    974     left_icon_margin_ = 0;
    975     right_icon_margin_ = 0;
    976   }
    977   int label_start = GetLabelStartForThisItem();
    978 
    979   int string_width = font.GetStringWidth(title_);
    980   if (!subtitle_.empty())
    981     string_width = std::max(string_width, font.GetStringWidth(subtitle_));
    982 
    983   dimensions.standard_width = string_width + label_start +
    984       item_right_margin_;
    985   // Determine the length of the right-side text.
    986   string16 minor_text = GetMinorText();
    987   dimensions.minor_text_width =
    988       minor_text.empty() ? 0 : GetFont().GetStringWidth(minor_text);
    989 
    990   // Determine the height to use.
    991   dimensions.height = std::max(dimensions.height,
    992       (subtitle_.empty() ? 0 : font.GetHeight()) +
    993       font.GetHeight() + GetBottomMargin() + GetTopMargin());
    994   dimensions.height = std::max(dimensions.height,
    995       GetMenuConfig().item_min_height);
    996   return dimensions;
    997 }
    998 
    999 int MenuItemView::GetLabelStartForThisItem() {
   1000   int label_start = label_start_ + left_icon_margin_ + right_icon_margin_;
   1001   if ((type_ == CHECKBOX || type_ == RADIO) && icon_view_) {
   1002     label_start += icon_view_->size().width() +
   1003         GetMenuConfig().icon_to_label_padding;
   1004   }
   1005   return label_start;
   1006 }
   1007 
   1008 string16 MenuItemView::GetMinorText() {
   1009   if (id() == kEmptyMenuItemViewID) {
   1010     // Don't query the delegate for menus that represent no children.
   1011     return string16();
   1012   }
   1013 
   1014   ui::Accelerator accelerator;
   1015   if (GetMenuConfig().show_accelerators && GetDelegate() && GetCommand() &&
   1016           GetDelegate()->GetAccelerator(GetCommand(), &accelerator)) {
   1017     return accelerator.GetShortcutText();
   1018   }
   1019 
   1020   return minor_text_;
   1021 }
   1022 
   1023 bool MenuItemView::IsContainer() const {
   1024   // Let the first child take over |this| when we only have one child and no
   1025   // title.
   1026   return (NonIconChildViewsCount() == 1) && title_.empty();
   1027 }
   1028 
   1029 int MenuItemView::NonIconChildViewsCount() const {
   1030   // Note that what child_count() returns is the number of children,
   1031   // not the number of menu items.
   1032   return child_count() - (icon_view_ ? 1 : 0);
   1033 }
   1034 
   1035 int MenuItemView::GetMaxIconViewWidth() const {
   1036   int width = 0;
   1037   for (int i = 0; i < submenu_->GetMenuItemCount(); ++i) {
   1038     MenuItemView* menu_item = submenu_->GetMenuItemAt(i);
   1039     int temp_width = 0;
   1040     if (menu_item->GetType() == CHECKBOX ||
   1041         menu_item->GetType() == RADIO) {
   1042       // If this item has a radio or checkbox, the icon will not affect
   1043       // alignment of other items.
   1044       continue;
   1045     } else if (menu_item->HasSubmenu()) {
   1046       temp_width = menu_item->GetMaxIconViewWidth();
   1047     } else if (menu_item->icon_view()) {
   1048       temp_width = menu_item->icon_view()->GetPreferredSize().width();
   1049     }
   1050     width = std::max(width, temp_width);
   1051   }
   1052   return width;
   1053 }
   1054 
   1055 bool MenuItemView::HasChecksOrRadioButtons() const {
   1056   for (int i = 0; i < submenu_->GetMenuItemCount(); ++i) {
   1057     MenuItemView* menu_item = submenu_->GetMenuItemAt(i);
   1058     if (menu_item->HasSubmenu()) {
   1059       if (menu_item->HasChecksOrRadioButtons())
   1060         return true;
   1061     } else {
   1062       const Type& type = menu_item->GetType();
   1063       if (type == CHECKBOX || type == RADIO)
   1064         return true;
   1065     }
   1066   }
   1067   return false;
   1068 }
   1069 
   1070 }  // namespace views
   1071