chrome/browser/ui/views/ash/tab_scrubber.cc

   1 // Copyright (c) 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/ui/views/ash/tab_scrubber.h"
   6
   7 #include "ash/shell.h"
   8 #include "ash/wm/window_util.h"
   9 #include "base/metrics/histogram.h"
  10 #include "chrome/browser/chrome_notification_types.h"
  11 #include "chrome/browser/ui/browser.h"
  12 #include "chrome/browser/ui/browser_finder.h"
  13 #include "chrome/browser/ui/tabs/tab_strip_model.h"
  14 #include "chrome/browser/ui/views/frame/browser_view.h"
  15 #include "chrome/browser/ui/views/tabs/tab.h"
  16 #include "chrome/browser/ui/views/tabs/tab_strip.h"
  17 #include "chrome/common/pref_names.h"
  18 #include "content/public/browser/notification_service.h"
  19 #include "content/public/browser/notification_source.h"
  20 #include "ui/aura/window.h"
  21 #include "ui/events/event.h"
  22 #include "ui/events/event_utils.h"
  23 #include "ui/events/gestures/gesture_configuration.h"
  24 #include "ui/views/controls/glow_hover_controller.h"
  25
  26 namespace {
  27 const int64 kActivationDelayMS = 200;
  28 }
  29
  30 // static
  31 TabScrubber* TabScrubber::GetInstance() {
  32   static TabScrubber* instance = NULL;
  33   if (!instance)
  34     instance = new TabScrubber();
  35   return instance;
  36 }
  37
  38 // static
  39 gfx::Point TabScrubber::GetStartPoint(
  40     TabStrip* tab_strip,
  41     int index,
  42     TabScrubber::Direction direction) {
  43   int initial_tab_offset = Tab::GetMiniWidth() / 2;
  44   gfx::Rect tab_bounds = tab_strip->tab_at(index)->bounds();
  45   float x = direction == LEFT ?
  46       tab_bounds.x() + initial_tab_offset :
  47           tab_bounds.right() - initial_tab_offset;
  48   return gfx::Point(x, tab_bounds.CenterPoint().y());
  49 }
  50
  51 bool TabScrubber::IsActivationPending() {
  52   return activate_timer_.IsRunning();
  53 }
  54
  55 TabScrubber::TabScrubber()
  56     : scrubbing_(false),
  57       browser_(NULL),
  58       swipe_x_(-1),
  59       swipe_y_(-1),
  60       swipe_direction_(LEFT),
  61       highlighted_tab_(-1),
  62       activate_timer_(true, false),
  63       activation_delay_(kActivationDelayMS),
  64       use_default_activation_delay_(true),
  65       weak_ptr_factory_(this) {
  66   ash::Shell::GetInstance()->AddPreTargetHandler(this);
  67   registrar_.Add(
  68       this,
  69       chrome::NOTIFICATION_BROWSER_CLOSED,
  70       content::NotificationService::AllSources());
  71 }
  72
  73 TabScrubber::~TabScrubber() {
  74   // Note: The weak_ptr_factory_ should invalidate  its weak pointers before
  75   // any other members are destroyed.
  76   weak_ptr_factory_.InvalidateWeakPtrs();
  77 }
  78
  79 void TabScrubber::OnScrollEvent(ui::ScrollEvent* event) {
  80   if (event->type() == ui::ET_SCROLL_FLING_CANCEL ||
  81       event->type() == ui::ET_SCROLL_FLING_START) {
  82     FinishScrub(true);
  83     immersive_reveal_lock_.reset();
  84     return;
  85   }
  86
  87   if (event->finger_count() != 3)
  88     return;
  89
  90   Browser* browser = GetActiveBrowser();
  91   if (!browser || (scrubbing_ && browser_ && browser != browser_) ||
  92       (highlighted_tab_ != -1 &&
  93           highlighted_tab_ >= browser->tab_strip_model()->count())) {
  94     FinishScrub(false);
  95     return;
  96   }
  97
  98   BrowserView* browser_view =
  99       BrowserView::GetBrowserViewForNativeWindow(
 100           browser->window()->GetNativeWindow());
 101   TabStrip* tab_strip = browser_view->tabstrip();
 102
 103   if (tab_strip->IsAnimating()) {
 104     FinishScrub(false);
 105     return;
 106   }
 107
 108   // We are handling the event.
 109   event->StopPropagation();
 110
 111   float x_offset = event->x_offset();
 112   int last_tab_index = highlighted_tab_ == -1 ?
 113       browser->tab_strip_model()->active_index() : highlighted_tab_;
 114   if (!scrubbing_) {
 115     swipe_direction_ = (x_offset < 0) ? LEFT : RIGHT;
 116     const gfx::Point start_point =
 117         GetStartPoint(tab_strip,
 118                       browser->tab_strip_model()->active_index(),
 119                       swipe_direction_);
 120     browser_ = browser;
 121     scrubbing_ = true;
 122
 123     swipe_x_ = start_point.x();
 124     swipe_y_ = start_point.y();
 125     ImmersiveModeController* immersive_controller =
 126         browser_view->immersive_mode_controller();
 127     if (immersive_controller->IsEnabled()) {
 128       immersive_reveal_lock_.reset(immersive_controller->GetRevealedLock(
 129           ImmersiveModeController::ANIMATE_REVEAL_YES));
 130     }
 131     tab_strip->AddObserver(this);
 132   } else if (highlighted_tab_ == -1) {
 133     Direction direction = (x_offset < 0) ? LEFT : RIGHT;
 134     if (direction != swipe_direction_) {
 135       const gfx::Point start_point =
 136           GetStartPoint(tab_strip,
 137                         browser->tab_strip_model()->active_index(),
 138                         direction);
 139       swipe_x_ = start_point.x();
 140       swipe_y_ = start_point.y();
 141       swipe_direction_ = direction;
 142     }
 143   }
 144
 145   swipe_x_ += x_offset;
 146   Tab* first_tab = tab_strip->tab_at(0);
 147   int first_tab_center = first_tab->bounds().CenterPoint().x();
 148   Tab* last_tab = tab_strip->tab_at(tab_strip->tab_count() - 1);
 149   int last_tab_tab_center = last_tab->bounds().CenterPoint().x();
 150   if (swipe_x_ < first_tab_center)
 151     swipe_x_ = first_tab_center;
 152   if (swipe_x_ > last_tab_tab_center)
 153     swipe_x_ = last_tab_tab_center;
 154
 155   Tab* initial_tab = tab_strip->tab_at(last_tab_index);
 156   gfx::Point tab_point(swipe_x_, swipe_y_);
 157   views::View::ConvertPointToTarget(tab_strip, initial_tab, &tab_point);
 158   Tab* new_tab = tab_strip->GetTabAt(initial_tab, tab_point);
 159   if (!new_tab)
 160     return;
 161
 162   int new_index = tab_strip->GetModelIndexOfTab(new_tab);
 163   if (highlighted_tab_ == -1 &&
 164       new_index == browser->tab_strip_model()->active_index())
 165     return;
 166
 167   if (new_index != highlighted_tab_) {
 168     if (activate_timer_.IsRunning()) {
 169       activate_timer_.Reset();
 170     } else {
 171       int delay = use_default_activation_delay_ ?
 172           ui::GestureConfiguration::tab_scrub_activation_delay_in_ms() :
 173           activation_delay_;
 174       if (delay >= 0) {
 175         activate_timer_.Start(FROM_HERE,
 176                               base::TimeDelta::FromMilliseconds(delay),
 177                               base::Bind(&TabScrubber::FinishScrub,
 178                                          weak_ptr_factory_.GetWeakPtr(),
 179                                          true));
 180       }
 181     }
 182     if (highlighted_tab_ != -1) {
 183       Tab* tab = tab_strip->tab_at(highlighted_tab_);
 184       tab->hover_controller()->HideImmediately();
 185     }
 186     if (new_index == browser->tab_strip_model()->active_index()) {
 187       highlighted_tab_ = -1;
 188     } else {
 189       highlighted_tab_ = new_index;
 190       new_tab->hover_controller()->Show(views::GlowHoverController::PRONOUNCED);
 191     }
 192   }
 193   if (highlighted_tab_ != -1) {
 194     gfx::Point hover_point(swipe_x_, swipe_y_);
 195     views::View::ConvertPointToTarget(tab_strip, new_tab, &hover_point);
 196     new_tab->hover_controller()->SetLocation(hover_point);
 197   }
 198 }
 199
 200 void TabScrubber::Observe(int type,
 201                           const content::NotificationSource& source,
 202                           const content::NotificationDetails& details) {
 203   if (content::Source<Browser>(source).ptr() == browser_) {
 204     activate_timer_.Stop();
 205     swipe_x_ = -1;
 206     swipe_y_ = -1;
 207     scrubbing_ = false;
 208     highlighted_tab_ = -1;
 209     browser_ = NULL;
 210   }
 211 }
 212
 213 void TabScrubber::TabStripAddedTabAt(TabStrip* tab_strip, int index) {
 214   if (highlighted_tab_ == -1)
 215     return;
 216
 217   if (index < highlighted_tab_)
 218     ++highlighted_tab_;
 219 }
 220
 221 void TabScrubber::TabStripMovedTab(TabStrip* tab_strip,
 222                                    int from_index,
 223                                    int to_index) {
 224   if (highlighted_tab_ == -1)
 225     return;
 226
 227   if (from_index == highlighted_tab_)
 228     highlighted_tab_ = to_index;
 229   else if (from_index < highlighted_tab_&& highlighted_tab_<= to_index)
 230     --highlighted_tab_;
 231   else if (from_index > highlighted_tab_ && highlighted_tab_ >= to_index)
 232     ++highlighted_tab_;
 233 }
 234
 235 void TabScrubber::TabStripRemovedTabAt(TabStrip* tab_strip, int index) {
 236   if (highlighted_tab_ == -1)
 237     return;
 238   if (index == highlighted_tab_) {
 239     FinishScrub(false);
 240     return;
 241   }
 242   if (index < highlighted_tab_)
 243     --highlighted_tab_;
 244 }
 245
 246 void TabScrubber::TabStripDeleted(TabStrip* tab_strip) {
 247   if (highlighted_tab_ == -1)
 248     return;
 249 }
 250
 251 Browser* TabScrubber::GetActiveBrowser() {
 252   aura::Window* active_window = ash::wm::GetActiveWindow();
 253   if (!active_window)
 254     return NULL;
 255
 256   Browser* browser = chrome::FindBrowserWithWindow(active_window);
 257   if (!browser || browser->type() != Browser::TYPE_TABBED)
 258     return NULL;
 259
 260   return browser;
 261 }
 262
 263 void TabScrubber::FinishScrub(bool activate) {
 264   activate_timer_.Stop();
 265
 266   if (browser_ && browser_->window()) {
 267     BrowserView* browser_view =
 268         BrowserView::GetBrowserViewForNativeWindow(
 269             browser_->window()->GetNativeWindow());
 270     TabStrip* tab_strip = browser_view->tabstrip();
 271     if (activate && highlighted_tab_ != -1) {
 272       Tab* tab = tab_strip->tab_at(highlighted_tab_);
 273       tab->hover_controller()->HideImmediately();
 274       int distance =
 275           std::abs(
 276               highlighted_tab_ - browser_->tab_strip_model()->active_index());
 277       UMA_HISTOGRAM_CUSTOM_COUNTS("Tabs.ScrubDistance", distance, 0, 20, 20);
 278       browser_->tab_strip_model()->ActivateTabAt(highlighted_tab_, true);
 279     }
 280     tab_strip->RemoveObserver(this);
 281   }
 282   swipe_x_ = -1;
 283   swipe_y_ = -1;
 284   scrubbing_ = false;
 285   highlighted_tab_ = -1;
 286 }