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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 "chrome/browser/ui/gtk/browser_toolbar_gtk.h"
      6 
      7 #include <gdk/gdkkeysyms.h>
      8 #include <gtk/gtk.h>
      9 #include <X11/XF86keysym.h>
     10 
     11 #include "base/base_paths.h"
     12 #include "base/command_line.h"
     13 #include "base/debug/trace_event.h"
     14 #include "base/i18n/rtl.h"
     15 #include "base/logging.h"
     16 #include "base/memory/singleton.h"
     17 #include "base/path_service.h"
     18 #include "base/prefs/pref_service.h"
     19 #include "chrome/app/chrome_command_ids.h"
     20 #include "chrome/browser/chrome_notification_types.h"
     21 #include "chrome/browser/profiles/profile.h"
     22 #include "chrome/browser/themes/theme_properties.h"
     23 #include "chrome/browser/themes/theme_service.h"
     24 #include "chrome/browser/ui/browser.h"
     25 #include "chrome/browser/ui/browser_commands.h"
     26 #include "chrome/browser/ui/global_error/global_error.h"
     27 #include "chrome/browser/ui/global_error/global_error_service.h"
     28 #include "chrome/browser/ui/global_error/global_error_service_factory.h"
     29 #include "chrome/browser/ui/gtk/accelerators_gtk.h"
     30 #include "chrome/browser/ui/gtk/back_forward_button_gtk.h"
     31 #include "chrome/browser/ui/gtk/bookmarks/bookmark_sub_menu_model_gtk.h"
     32 #include "chrome/browser/ui/gtk/browser_actions_toolbar_gtk.h"
     33 #include "chrome/browser/ui/gtk/browser_window_gtk.h"
     34 #include "chrome/browser/ui/gtk/custom_button.h"
     35 #include "chrome/browser/ui/gtk/event_utils.h"
     36 #include "chrome/browser/ui/gtk/gtk_chrome_button.h"
     37 #include "chrome/browser/ui/gtk/gtk_theme_service.h"
     38 #include "chrome/browser/ui/gtk/gtk_util.h"
     39 #include "chrome/browser/ui/gtk/location_bar_view_gtk.h"
     40 #include "chrome/browser/ui/gtk/reload_button_gtk.h"
     41 #include "chrome/browser/ui/gtk/rounded_window.h"
     42 #include "chrome/browser/ui/gtk/tabs/tab_strip_gtk.h"
     43 #include "chrome/browser/ui/gtk/view_id_util.h"
     44 #include "chrome/browser/ui/toolbar/encoding_menu_controller.h"
     45 #include "chrome/browser/upgrade_detector.h"
     46 #include "chrome/common/net/url_fixer_upper.h"
     47 #include "chrome/common/pref_names.h"
     48 #include "chrome/common/url_constants.h"
     49 #include "content/public/browser/host_zoom_map.h"
     50 #include "content/public/browser/notification_details.h"
     51 #include "content/public/browser/notification_service.h"
     52 #include "content/public/browser/user_metrics.h"
     53 #include "content/public/browser/web_contents.h"
     54 #include "grit/chromium_strings.h"
     55 #include "grit/generated_resources.h"
     56 #include "grit/theme_resources.h"
     57 #include "ui/base/dragdrop/gtk_dnd_util.h"
     58 #include "ui/base/l10n/l10n_util.h"
     59 #include "ui/base/resource/resource_bundle.h"
     60 #include "ui/gfx/canvas_skia_paint.h"
     61 #include "ui/gfx/gtk_util.h"
     62 #include "ui/gfx/image/cairo_cached_surface.h"
     63 #include "ui/gfx/skbitmap_operations.h"
     64 
     65 using content::HostZoomMap;
     66 using content::UserMetricsAction;
     67 using content::WebContents;
     68 
     69 namespace {
     70 
     71 // Padding on left and right of the left toolbar buttons (back, forward, reload,
     72 // etc.).
     73 const int kToolbarLeftAreaPadding = 4;
     74 
     75 // Height of the toolbar in pixels (not counting padding).
     76 const int kToolbarHeight = 29;
     77 
     78 // Padding within the toolbar above the buttons and location bar.
     79 const int kTopBottomPadding = 3;
     80 
     81 // Height of the toolbar in pixels when we only show the location bar.
     82 const int kToolbarHeightLocationBarOnly = kToolbarHeight - 2;
     83 
     84 // Interior spacing between toolbar widgets.
     85 const int kToolbarWidgetSpacing = 1;
     86 
     87 // Amount of rounding on top corners of toolbar. Only used in Gtk theme mode.
     88 const int kToolbarCornerSize = 3;
     89 
     90 void SetWidgetHeightRequest(GtkWidget* widget, gpointer user_data) {
     91   gtk_widget_set_size_request(widget, -1, GPOINTER_TO_INT(user_data));
     92 }
     93 
     94 }  // namespace
     95 
     96 // BrowserToolbarGtk, public ---------------------------------------------------
     97 
     98 BrowserToolbarGtk::BrowserToolbarGtk(Browser* browser, BrowserWindowGtk* window)
     99     : toolbar_(NULL),
    100       location_bar_(new LocationBarViewGtk(browser)),
    101       is_wrench_menu_model_valid_(true),
    102       browser_(browser),
    103       window_(window) {
    104   wrench_menu_model_.reset(new WrenchMenuModel(this, browser_, false));
    105 
    106   chrome::AddCommandObserver(browser_, IDC_BACK, this);
    107   chrome::AddCommandObserver(browser_, IDC_FORWARD, this);
    108   chrome::AddCommandObserver(browser_, IDC_HOME, this);
    109   chrome::AddCommandObserver(browser_, IDC_BOOKMARK_PAGE, this);
    110 
    111   registrar_.Add(this,
    112                  chrome::NOTIFICATION_UPGRADE_RECOMMENDED,
    113                  content::NotificationService::AllSources());
    114   registrar_.Add(this,
    115                  chrome::NOTIFICATION_GLOBAL_ERRORS_CHANGED,
    116                  content::Source<Profile>(browser_->profile()));
    117 }
    118 
    119 BrowserToolbarGtk::~BrowserToolbarGtk() {
    120   chrome::RemoveCommandObserver(browser_, IDC_BACK, this);
    121   chrome::RemoveCommandObserver(browser_, IDC_FORWARD, this);
    122   chrome::RemoveCommandObserver(browser_, IDC_HOME, this);
    123   chrome::RemoveCommandObserver(browser_, IDC_BOOKMARK_PAGE, this);
    124 
    125   offscreen_entry_.Destroy();
    126 
    127   wrench_menu_.reset();
    128 }
    129 
    130 void BrowserToolbarGtk::Init(GtkWindow* top_level_window) {
    131   Profile* profile = browser_->profile();
    132   theme_service_ = GtkThemeService::GetFrom(profile);
    133   registrar_.Add(this,
    134                  chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
    135                  content::Source<ThemeService>(theme_service_));
    136 
    137   offscreen_entry_.Own(gtk_entry_new());
    138 
    139   base::Closure callback =
    140       base::Bind(&BrowserToolbarGtk::SetUpDragForHomeButton,
    141                  base::Unretained(this));
    142 
    143   show_home_button_.Init(prefs::kShowHomeButton, profile->GetPrefs(),
    144                          base::Bind(&BrowserToolbarGtk::UpdateShowHomeButton,
    145                                     base::Unretained(this)));
    146   home_page_.Init(prefs::kHomePage, profile->GetPrefs(), callback);
    147   home_page_is_new_tab_page_.Init(prefs::kHomePageIsNewTabPage,
    148                                   profile->GetPrefs(),
    149                                   callback);
    150 
    151   event_box_ = gtk_event_box_new();
    152   // Make the event box transparent so themes can use transparent toolbar
    153   // backgrounds.
    154   if (!theme_service_->UsingNativeTheme())
    155     gtk_event_box_set_visible_window(GTK_EVENT_BOX(event_box_), FALSE);
    156 
    157   toolbar_ = gtk_hbox_new(FALSE, 0);
    158   alignment_ = gtk_alignment_new(0.0, 0.0, 1.0, 1.0);
    159   UpdateForBookmarkBarVisibility(false);
    160   g_signal_connect(alignment_, "expose-event",
    161                    G_CALLBACK(&OnAlignmentExposeThunk), this);
    162   gtk_container_add(GTK_CONTAINER(event_box_), alignment_);
    163   gtk_container_add(GTK_CONTAINER(alignment_), toolbar_);
    164 
    165   toolbar_left_ = gtk_hbox_new(FALSE, kToolbarWidgetSpacing);
    166 
    167   GtkSizeGroup* size_group = gtk_size_group_new(GTK_SIZE_GROUP_HORIZONTAL);
    168   back_.reset(new BackForwardButtonGtk(browser_, false));
    169   g_signal_connect(back_->widget(), "clicked",
    170                    G_CALLBACK(OnButtonClickThunk), this);
    171   gtk_size_group_add_widget(size_group, back_->widget());
    172   gtk_box_pack_start(GTK_BOX(toolbar_left_), back_->widget(), FALSE,
    173                      FALSE, 0);
    174 
    175   forward_.reset(new BackForwardButtonGtk(browser_, true));
    176   g_signal_connect(forward_->widget(), "clicked",
    177                    G_CALLBACK(OnButtonClickThunk), this);
    178   gtk_size_group_add_widget(size_group, forward_->widget());
    179   gtk_box_pack_start(GTK_BOX(toolbar_left_), forward_->widget(), FALSE,
    180                      FALSE, 0);
    181 
    182   reload_.reset(new ReloadButtonGtk(location_bar_.get(), browser_));
    183   gtk_size_group_add_widget(size_group, reload_->widget());
    184   gtk_box_pack_start(GTK_BOX(toolbar_left_), reload_->widget(), FALSE, FALSE,
    185                      0);
    186 
    187   home_.reset(new CustomDrawButton(theme_service_, IDR_HOME, IDR_HOME_P,
    188       IDR_HOME_H, 0, GTK_STOCK_HOME, GTK_ICON_SIZE_SMALL_TOOLBAR));
    189   gtk_widget_set_tooltip_text(home_->widget(),
    190       l10n_util::GetStringUTF8(IDS_TOOLTIP_HOME).c_str());
    191   g_signal_connect(home_->widget(), "clicked",
    192                    G_CALLBACK(OnButtonClickThunk), this);
    193   gtk_size_group_add_widget(size_group, home_->widget());
    194   gtk_box_pack_start(GTK_BOX(toolbar_left_), home_->widget(), FALSE, FALSE,
    195                      kToolbarWidgetSpacing);
    196   gtk_util::SetButtonTriggersNavigation(home_->widget());
    197 
    198   gtk_box_pack_start(GTK_BOX(toolbar_), toolbar_left_, FALSE, FALSE,
    199                      kToolbarLeftAreaPadding);
    200 
    201   g_object_unref(size_group);
    202 
    203   location_hbox_ = gtk_hbox_new(FALSE, 0);
    204   location_bar_->Init(ShouldOnlyShowLocation());
    205   gtk_box_pack_start(GTK_BOX(location_hbox_), location_bar_->widget(), TRUE,
    206                      TRUE, 0);
    207 
    208   g_signal_connect(location_hbox_, "expose-event",
    209                    G_CALLBACK(OnLocationHboxExposeThunk), this);
    210   gtk_box_pack_start(GTK_BOX(toolbar_), location_hbox_, TRUE, TRUE,
    211       ShouldOnlyShowLocation() ? 1 : 0);
    212 
    213   if (!ShouldOnlyShowLocation()) {
    214     actions_toolbar_.reset(new BrowserActionsToolbarGtk(browser_));
    215     gtk_box_pack_start(GTK_BOX(toolbar_), actions_toolbar_->widget(),
    216                        FALSE, FALSE, 0);
    217   }
    218 
    219   wrench_menu_image_ = gtk_image_new_from_pixbuf(
    220       theme_service_->GetRTLEnabledPixbufNamed(IDR_TOOLS));
    221   wrench_menu_button_.reset(new CustomDrawButton(theme_service_, IDR_TOOLS,
    222       IDR_TOOLS_P, IDR_TOOLS_H, 0, wrench_menu_image_));
    223   GtkWidget* wrench_button = wrench_menu_button_->widget();
    224 
    225   gtk_widget_set_tooltip_text(
    226       wrench_button,
    227       l10n_util::GetStringUTF8(IDS_APPMENU_TOOLTIP).c_str());
    228   g_signal_connect(wrench_button, "button-press-event",
    229                    G_CALLBACK(OnMenuButtonPressEventThunk), this);
    230   gtk_widget_set_can_focus(wrench_button, FALSE);
    231 
    232   // Put the wrench button in a box so that we can paint the update notification
    233   // over it.
    234   GtkWidget* wrench_box = gtk_alignment_new(0, 0, 1, 1);
    235   g_signal_connect_after(wrench_box, "expose-event",
    236                          G_CALLBACK(OnWrenchMenuButtonExposeThunk), this);
    237   gtk_container_add(GTK_CONTAINER(wrench_box), wrench_button);
    238   gtk_box_pack_start(GTK_BOX(toolbar_), wrench_box, FALSE, FALSE, 4);
    239 
    240   wrench_menu_.reset(new MenuGtk(this, wrench_menu_model_.get()));
    241   // The bookmark menu model needs to be able to force the wrench menu to close.
    242   wrench_menu_model_->bookmark_sub_menu_model()->SetMenuGtk(wrench_menu_.get());
    243 
    244   zoom_subscription_ = HostZoomMap::GetForBrowserContext(
    245       browser()->profile())->AddZoomLevelChangedCallback(
    246           base::Bind(&BrowserToolbarGtk::OnZoomLevelChanged,
    247                      base::Unretained(this)));
    248 
    249   if (ShouldOnlyShowLocation()) {
    250     gtk_widget_show(event_box_);
    251     gtk_widget_show(alignment_);
    252     gtk_widget_show(toolbar_);
    253     gtk_widget_show_all(location_hbox_);
    254     gtk_widget_hide(reload_->widget());
    255   } else {
    256     gtk_widget_show_all(event_box_);
    257     if (actions_toolbar_->button_count() == 0)
    258       gtk_widget_hide(actions_toolbar_->widget());
    259   }
    260 
    261   // Initialize pref-dependent UI state.
    262   UpdateShowHomeButton();
    263   SetUpDragForHomeButton();
    264 
    265   // Because the above does a recursive show all on all widgets we need to
    266   // update the icon visibility to hide them.
    267   location_bar_->UpdateContentSettingsIcons();
    268 
    269   SetViewIDs();
    270   theme_service_->InitThemesFor(this);
    271 }
    272 
    273 void BrowserToolbarGtk::SetViewIDs() {
    274   ViewIDUtil::SetID(widget(), VIEW_ID_TOOLBAR);
    275   ViewIDUtil::SetID(back_->widget(), VIEW_ID_BACK_BUTTON);
    276   ViewIDUtil::SetID(forward_->widget(), VIEW_ID_FORWARD_BUTTON);
    277   ViewIDUtil::SetID(reload_->widget(), VIEW_ID_RELOAD_BUTTON);
    278   ViewIDUtil::SetID(home_->widget(), VIEW_ID_HOME_BUTTON);
    279   ViewIDUtil::SetID(location_bar_->widget(), VIEW_ID_OMNIBOX);
    280   ViewIDUtil::SetID(wrench_menu_button_->widget(), VIEW_ID_APP_MENU);
    281 }
    282 
    283 void BrowserToolbarGtk::Show() {
    284   gtk_widget_show(toolbar_);
    285 }
    286 
    287 void BrowserToolbarGtk::Hide() {
    288   gtk_widget_hide(toolbar_);
    289 }
    290 
    291 LocationBar* BrowserToolbarGtk::GetLocationBar() const {
    292   return location_bar_.get();
    293 }
    294 
    295 void BrowserToolbarGtk::UpdateForBookmarkBarVisibility(
    296     bool show_bottom_padding) {
    297   gtk_alignment_set_padding(GTK_ALIGNMENT(alignment_),
    298       ShouldOnlyShowLocation() ? 0 : kTopBottomPadding,
    299       !show_bottom_padding || ShouldOnlyShowLocation() ? 0 : kTopBottomPadding,
    300       0, 0);
    301 }
    302 
    303 void BrowserToolbarGtk::ShowAppMenu() {
    304   wrench_menu_->Cancel();
    305 
    306   if (!is_wrench_menu_model_valid_)
    307     RebuildWrenchMenu();
    308 
    309   wrench_menu_button_->SetPaintOverride(GTK_STATE_ACTIVE);
    310   content::RecordAction(UserMetricsAction("ShowAppMenu"));
    311   wrench_menu_->PopupAsFromKeyEvent(wrench_menu_button_->widget());
    312 }
    313 
    314 // CommandObserver -------------------------------------------------------------
    315 
    316 void BrowserToolbarGtk::EnabledStateChangedForCommand(int id, bool enabled) {
    317   GtkWidget* widget = NULL;
    318   switch (id) {
    319     case IDC_BACK:
    320       widget = back_->widget();
    321       break;
    322     case IDC_FORWARD:
    323       widget = forward_->widget();
    324       break;
    325     case IDC_HOME:
    326       if (home_.get())
    327         widget = home_->widget();
    328       break;
    329   }
    330   if (widget) {
    331     if (!enabled && gtk_widget_get_state(widget) == GTK_STATE_PRELIGHT) {
    332       // If we're disabling a widget, GTK will helpfully restore it to its
    333       // previous state when we re-enable it, even if that previous state
    334       // is the prelight.  This looks bad.  See the bug for a simple repro.
    335       // http://code.google.com/p/chromium/issues/detail?id=13729
    336       gtk_widget_set_state(widget, GTK_STATE_NORMAL);
    337     }
    338     gtk_widget_set_sensitive(widget, enabled);
    339   }
    340 }
    341 
    342 // MenuGtk::Delegate -----------------------------------------------------------
    343 
    344 void BrowserToolbarGtk::StoppedShowing() {
    345   // Without these calls, the hover state can get stuck since the leave-notify
    346   // event is not sent when clicking a button brings up the menu.
    347   gtk_chrome_button_set_hover_state(
    348       GTK_CHROME_BUTTON(wrench_menu_button_->widget()), 0.0);
    349   wrench_menu_button_->UnsetPaintOverride();
    350 }
    351 
    352 GtkIconSet* BrowserToolbarGtk::GetIconSetForId(int idr) {
    353   return theme_service_->GetIconSetForId(idr);
    354 }
    355 
    356 // Always show images because we desire that some icons always show
    357 // regardless of the system setting.
    358 bool BrowserToolbarGtk::AlwaysShowIconForCmd(int command_id) const {
    359   return command_id == IDC_UPGRADE_DIALOG ||
    360       BookmarkSubMenuModel::IsBookmarkItemCommandId(command_id);
    361 }
    362 
    363 // ui::AcceleratorProvider
    364 
    365 bool BrowserToolbarGtk::GetAcceleratorForCommandId(
    366     int id,
    367     ui::Accelerator* out_accelerator) {
    368   const ui::Accelerator* accelerator =
    369       AcceleratorsGtk::GetInstance()->GetPrimaryAcceleratorForCommand(id);
    370   if (!accelerator)
    371     return false;
    372   *out_accelerator = *accelerator;
    373   return true;
    374 }
    375 
    376 // content::NotificationObserver -----------------------------------------------
    377 
    378 void BrowserToolbarGtk::Observe(int type,
    379                                 const content::NotificationSource& source,
    380                                 const content::NotificationDetails& details) {
    381   if (type == chrome::NOTIFICATION_BROWSER_THEME_CHANGED) {
    382     // Update the spacing around the menu buttons
    383     bool use_gtk = theme_service_->UsingNativeTheme();
    384     int border = use_gtk ? 0 : 2;
    385     gtk_container_set_border_width(
    386         GTK_CONTAINER(wrench_menu_button_->widget()), border);
    387 
    388     // Force the height of the toolbar so we get the right amount of padding
    389     // above and below the location bar. We always force the size of the widgets
    390     // to either side of the location box, but we only force the location box
    391     // size in chrome-theme mode because that's the only time we try to control
    392     // the font size.
    393     int toolbar_height = ShouldOnlyShowLocation() ?
    394                          kToolbarHeightLocationBarOnly : kToolbarHeight;
    395     gtk_container_foreach(GTK_CONTAINER(toolbar_), SetWidgetHeightRequest,
    396                           GINT_TO_POINTER(toolbar_height));
    397     gtk_widget_set_size_request(location_hbox_, -1,
    398                                 use_gtk ? -1 : toolbar_height);
    399 
    400     // When using the GTK+ theme, we need to have the event box be visible so
    401     // buttons don't get a halo color from the background.  When using Chromium
    402     // themes, we want to let the background show through the toolbar.
    403     gtk_event_box_set_visible_window(GTK_EVENT_BOX(event_box_), use_gtk);
    404 
    405     if (use_gtk) {
    406       // We need to manually update the icon if we are in GTK mode. (Note that
    407       // we set the initial value in Init()).
    408       gtk_image_set_from_pixbuf(
    409           GTK_IMAGE(wrench_menu_image_),
    410           theme_service_->GetRTLEnabledPixbufNamed(IDR_TOOLS));
    411     }
    412 
    413     UpdateRoundedness();
    414   } else if (type == chrome::NOTIFICATION_UPGRADE_RECOMMENDED) {
    415     // Redraw the wrench menu to update the badge.
    416     gtk_widget_queue_draw(wrench_menu_button_->widget());
    417   } else if (type == chrome::NOTIFICATION_GLOBAL_ERRORS_CHANGED) {
    418     is_wrench_menu_model_valid_ = false;
    419     gtk_widget_queue_draw(wrench_menu_button_->widget());
    420   } else {
    421     NOTREACHED();
    422   }
    423 }
    424 
    425 // BrowserToolbarGtk, public ---------------------------------------------------
    426 
    427 void BrowserToolbarGtk::UpdateWebContents(WebContents* contents) {
    428   location_bar_->Update(contents);
    429 
    430   if (actions_toolbar_.get())
    431     actions_toolbar_->Update();
    432 }
    433 
    434 bool BrowserToolbarGtk::IsWrenchMenuShowing() const {
    435   return wrench_menu_.get() && gtk_widget_get_visible(wrench_menu_->widget());
    436 }
    437 
    438 // BrowserToolbarGtk, private --------------------------------------------------
    439 
    440 void BrowserToolbarGtk::OnZoomLevelChanged(
    441     const HostZoomMap::ZoomLevelChange& change) {
    442   // Since BrowserToolbarGtk create a new |wrench_menu_model_| in
    443   // RebuildWrenchMenu(), the ordering of the observers of HostZoomMap
    444   // can change, and result in subtle bugs like http://crbug.com/118823.
    445   // Rather than depending on the ordering of the observers, always update
    446   // the WrenchMenuModel before updating the WrenchMenu.
    447   wrench_menu_model_->UpdateZoomControls();
    448 
    449   // If our zoom level changed, we need to tell the menu to update its state,
    450   // since the menu could still be open.
    451   wrench_menu_->UpdateMenu();
    452 }
    453 
    454 
    455 void BrowserToolbarGtk::SetUpDragForHomeButton() {
    456   if (!home_page_.IsManaged() && !home_page_is_new_tab_page_.IsManaged()) {
    457     gtk_drag_dest_set(home_->widget(), GTK_DEST_DEFAULT_ALL,
    458                       NULL, 0, GDK_ACTION_COPY);
    459     static const int targets[] = { ui::TEXT_PLAIN, ui::TEXT_URI_LIST, -1 };
    460     ui::SetDestTargetList(home_->widget(), targets);
    461 
    462     drop_handler_.reset(new ui::GtkSignalRegistrar());
    463     drop_handler_->Connect(home_->widget(), "drag-data-received",
    464                            G_CALLBACK(OnDragDataReceivedThunk), this);
    465   } else {
    466     gtk_drag_dest_unset(home_->widget());
    467     drop_handler_.reset(NULL);
    468   }
    469 }
    470 
    471 bool BrowserToolbarGtk::UpdateRoundedness() {
    472   // We still round the corners if we are in chrome theme mode, but we do it by
    473   // drawing theme resources rather than changing the physical shape of the
    474   // widget.
    475   bool should_be_rounded = theme_service_->UsingNativeTheme() &&
    476       window_->ShouldDrawContentDropShadow();
    477 
    478   if (should_be_rounded == gtk_util::IsActingAsRoundedWindow(alignment_))
    479     return false;
    480 
    481   if (should_be_rounded) {
    482     gtk_util::ActAsRoundedWindow(alignment_, GdkColor(), kToolbarCornerSize,
    483                                  gtk_util::ROUNDED_TOP,
    484                                  gtk_util::BORDER_NONE);
    485   } else {
    486     gtk_util::StopActingAsRoundedWindow(alignment_);
    487   }
    488 
    489   return true;
    490 }
    491 
    492 gboolean BrowserToolbarGtk::OnAlignmentExpose(GtkWidget* widget,
    493                                               GdkEventExpose* e) {
    494   TRACE_EVENT0("ui::gtk", "BrowserToolbarGtk::OnAlignmentExpose");
    495 
    496   // We may need to update the roundedness of the toolbar's top corners. In
    497   // this case, don't draw; we'll be called again soon enough.
    498   if (UpdateRoundedness())
    499     return TRUE;
    500 
    501   // We don't need to render the toolbar image in GTK mode.
    502   if (theme_service_->UsingNativeTheme())
    503     return FALSE;
    504 
    505   cairo_t* cr = gdk_cairo_create(gtk_widget_get_window(widget));
    506   gdk_cairo_rectangle(cr, &e->area);
    507   cairo_clip(cr);
    508 
    509   gfx::Point tabstrip_origin =
    510       window_->tabstrip()->GetTabStripOriginForWidget(widget);
    511   // Fill the entire region with the toolbar color.
    512   GdkColor color = theme_service_->GetGdkColor(
    513       ThemeProperties::COLOR_TOOLBAR);
    514   gdk_cairo_set_source_color(cr, &color);
    515   cairo_fill(cr);
    516 
    517   // The horizontal size of the top left and right corner images.
    518   const int kCornerWidth = 4;
    519   // The thickness of the shadow outside the toolbar's bounds; the offset
    520   // between the edge of the toolbar and where we anchor the corner images.
    521   const int kShadowThickness = 2;
    522 
    523   GtkAllocation allocation;
    524   gtk_widget_get_allocation(widget, &allocation);
    525   gfx::Rect area(e->area);
    526   gfx::Rect right(allocation.x + allocation.width - kCornerWidth,
    527                   allocation.y - kShadowThickness,
    528                   kCornerWidth,
    529                   allocation.height + kShadowThickness);
    530   gfx::Rect left(allocation.x - kShadowThickness,
    531                  allocation.y - kShadowThickness,
    532                  kCornerWidth,
    533                  allocation.height + kShadowThickness);
    534 
    535   if (window_->ShouldDrawContentDropShadow()) {
    536     // Leave room to draw rounded corners.
    537     area.Subtract(right);
    538     area.Subtract(left);
    539   }
    540 
    541   gfx::Image background = theme_service_->GetImageNamed(IDR_THEME_TOOLBAR);
    542   background.ToCairo()->SetSource(
    543       cr, widget, tabstrip_origin.x(), tabstrip_origin.y());
    544   cairo_pattern_set_extend(cairo_get_source(cr), CAIRO_EXTEND_REPEAT);
    545   cairo_rectangle(cr, area.x(), area.y(), area.width(), area.height());
    546   cairo_fill(cr);
    547 
    548   if (!window_->ShouldDrawContentDropShadow()) {
    549     // The rest of this function is for rounded corners. Our work is done here.
    550     cairo_destroy(cr);
    551     return FALSE;
    552   }
    553 
    554   bool draw_left_corner = left.Intersects(gfx::Rect(e->area));
    555   bool draw_right_corner = right.Intersects(gfx::Rect(e->area));
    556 
    557   if (draw_left_corner || draw_right_corner) {
    558     // Create a mask which is composed of the left and/or right corners.
    559     cairo_surface_t* target = cairo_surface_create_similar(
    560         cairo_get_target(cr),
    561         CAIRO_CONTENT_COLOR_ALPHA,
    562         allocation.x + allocation.width,
    563         allocation.y + allocation.height);
    564     cairo_t* copy_cr = cairo_create(target);
    565 
    566     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
    567 
    568     cairo_set_operator(copy_cr, CAIRO_OPERATOR_SOURCE);
    569     if (draw_left_corner) {
    570       rb.GetNativeImageNamed(IDR_CONTENT_TOP_LEFT_CORNER_MASK).ToCairo()->
    571           SetSource(copy_cr, widget, left.x(), left.y());
    572       cairo_paint(copy_cr);
    573     }
    574     if (draw_right_corner) {
    575       rb.GetNativeImageNamed(IDR_CONTENT_TOP_RIGHT_CORNER_MASK).ToCairo()->
    576           SetSource(copy_cr, widget, right.x(), right.y());
    577       // We fill a path rather than just painting because we don't want to
    578       // overwrite the left corner.
    579       cairo_rectangle(copy_cr, right.x(), right.y(),
    580                       right.width(), right.height());
    581       cairo_fill(copy_cr);
    582     }
    583 
    584     // Draw the background. CAIRO_OPERATOR_IN uses the existing pixel data as
    585     // an alpha mask.
    586     background.ToCairo()->SetSource(copy_cr, widget,
    587                                      tabstrip_origin.x(), tabstrip_origin.y());
    588     cairo_set_operator(copy_cr, CAIRO_OPERATOR_IN);
    589     cairo_pattern_set_extend(cairo_get_source(copy_cr), CAIRO_EXTEND_REPEAT);
    590     cairo_paint(copy_cr);
    591     cairo_destroy(copy_cr);
    592 
    593     // Copy the temporary surface to the screen.
    594     cairo_set_source_surface(cr, target, 0, 0);
    595     cairo_paint(cr);
    596     cairo_surface_destroy(target);
    597   }
    598 
    599   cairo_destroy(cr);
    600 
    601   return FALSE;  // Allow subwidgets to paint.
    602 }
    603 
    604 gboolean BrowserToolbarGtk::OnLocationHboxExpose(GtkWidget* location_hbox,
    605                                                  GdkEventExpose* e) {
    606   TRACE_EVENT0("ui::gtk", "BrowserToolbarGtk::OnLocationHboxExpose");
    607   if (theme_service_->UsingNativeTheme()) {
    608     GtkAllocation allocation;
    609     gtk_widget_get_allocation(location_hbox, &allocation);
    610     gtk_util::DrawTextEntryBackground(offscreen_entry_.get(),
    611                                       location_hbox, &e->area,
    612                                       &allocation);
    613   }
    614 
    615   return FALSE;
    616 }
    617 
    618 void BrowserToolbarGtk::OnButtonClick(GtkWidget* button) {
    619   if ((button == back_->widget()) || (button == forward_->widget())) {
    620     if (event_utils::DispositionForCurrentButtonPressEvent() == CURRENT_TAB)
    621       location_bar_->Revert();
    622     return;
    623   }
    624 
    625   DCHECK(home_.get() && button == home_->widget()) <<
    626       "Unexpected button click callback";
    627   chrome::Home(browser_, event_utils::DispositionForCurrentButtonPressEvent());
    628 }
    629 
    630 gboolean BrowserToolbarGtk::OnMenuButtonPressEvent(GtkWidget* button,
    631                                                    GdkEventButton* event) {
    632   if (event->button != 1)
    633     return FALSE;
    634 
    635   if (!is_wrench_menu_model_valid_)
    636     RebuildWrenchMenu();
    637 
    638   wrench_menu_button_->SetPaintOverride(GTK_STATE_ACTIVE);
    639   wrench_menu_->PopupForWidget(button, event->button, event->time);
    640 
    641   return TRUE;
    642 }
    643 
    644 void BrowserToolbarGtk::OnDragDataReceived(GtkWidget* widget,
    645     GdkDragContext* drag_context, gint x, gint y,
    646     GtkSelectionData* data, guint info, guint time) {
    647   if (info != ui::TEXT_PLAIN) {
    648     NOTIMPLEMENTED() << "Only support plain text drops for now, sorry!";
    649     return;
    650   }
    651 
    652   GURL url(reinterpret_cast<const char*>(gtk_selection_data_get_data(data)));
    653   if (!url.is_valid())
    654     return;
    655 
    656   bool url_is_newtab = url.SchemeIs(chrome::kChromeUIScheme) &&
    657                        url.host() == chrome::kChromeUINewTabHost;
    658   home_page_is_new_tab_page_.SetValue(url_is_newtab);
    659   if (!url_is_newtab)
    660     home_page_.SetValue(url.spec());
    661 }
    662 
    663 bool BrowserToolbarGtk::ShouldOnlyShowLocation() const {
    664   // If we're a popup window, only show the location bar (omnibox).
    665   return !browser_->is_type_tabbed();
    666 }
    667 
    668 void BrowserToolbarGtk::RebuildWrenchMenu() {
    669   wrench_menu_model_.reset(new WrenchMenuModel(this, browser_, false));
    670   wrench_menu_.reset(new MenuGtk(this, wrench_menu_model_.get()));
    671   // The bookmark menu model needs to be able to force the wrench menu to close.
    672   wrench_menu_model_->bookmark_sub_menu_model()->SetMenuGtk(wrench_menu_.get());
    673   is_wrench_menu_model_valid_ = true;
    674 }
    675 
    676 gboolean BrowserToolbarGtk::OnWrenchMenuButtonExpose(GtkWidget* sender,
    677                                                      GdkEventExpose* expose) {
    678   TRACE_EVENT0("ui::gtk", "BrowserToolbarGtk::OnWrenchMenuButtonExpose");
    679   int resource_id = 0;
    680   if (UpgradeDetector::GetInstance()->notify_upgrade()) {
    681     resource_id = UpgradeDetector::GetInstance()->GetIconResourceID(
    682             UpgradeDetector::UPGRADE_ICON_TYPE_BADGE);
    683   } else {
    684     GlobalError* error = GlobalErrorServiceFactory::GetForProfile(
    685         browser_->profile())->GetHighestSeverityGlobalErrorWithWrenchMenuItem();
    686     if (error) {
    687       switch (error->GetSeverity()) {
    688         case GlobalError::SEVERITY_LOW:
    689           resource_id = IDR_UPDATE_BADGE;
    690           break;
    691         case GlobalError::SEVERITY_MEDIUM:
    692           resource_id = IDR_UPDATE_BADGE4;
    693           break;
    694         case GlobalError::SEVERITY_HIGH:
    695           resource_id = IDR_UPDATE_BADGE3;
    696           break;
    697       }
    698     }
    699   }
    700 
    701   if (!resource_id)
    702     return FALSE;
    703 
    704   GtkAllocation allocation;
    705   gtk_widget_get_allocation(sender, &allocation);
    706 
    707   // Draw the chrome app menu icon onto the canvas.
    708   const gfx::ImageSkia* badge = theme_service_->GetImageSkiaNamed(resource_id);
    709   gfx::CanvasSkiaPaint canvas(expose, false);
    710   int x_offset = base::i18n::IsRTL() ? 0 : allocation.width - badge->width();
    711   int y_offset = 0;
    712   canvas.DrawImageInt(*badge,
    713                       allocation.x + x_offset,
    714                       allocation.y + y_offset);
    715 
    716   return FALSE;
    717 }
    718 
    719 void BrowserToolbarGtk::UpdateShowHomeButton() {
    720   bool visible = show_home_button_.GetValue() && !ShouldOnlyShowLocation();
    721   gtk_widget_set_visible(home_->widget(), visible);
    722 }
    723