chrome/browser/ui/find_bar/find_bar_controller.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/find_bar/find_bar_controller.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/i18n/rtl.h"
  10 #include "base/logging.h"
  11 #include "build/build_config.h"
  12 #include "chrome/browser/chrome_notification_types.h"
  13 #include "chrome/browser/profiles/profile.h"
  14 #include "chrome/browser/ui/find_bar/find_bar.h"
  15 #include "chrome/browser/ui/find_bar/find_bar_state.h"
  16 #include "chrome/browser/ui/find_bar/find_bar_state_factory.h"
  17 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
  18 #include "content/public/browser/navigation_details.h"
  19 #include "content/public/browser/navigation_entry.h"
  20 #include "content/public/browser/notification_details.h"
  21 #include "content/public/browser/notification_source.h"
  22 #include "content/public/browser/web_contents.h"
  23 #include "ui/gfx/geometry/rect.h"
  24
  25 using content::NavigationController;
  26 using content::WebContents;
  27
  28 // The minimum space between the FindInPage window and the search result.
  29 static const int kMinFindWndDistanceFromSelection = 5;
  30
  31 FindBarController::FindBarController(FindBar* find_bar)
  32     : find_bar_(find_bar),
  33       web_contents_(NULL),
  34       last_reported_matchcount_(0) {
  35 }
  36
  37 FindBarController::~FindBarController() {
  38   DCHECK(!web_contents_);
  39 }
  40
  41 void FindBarController::Show() {
  42   FindTabHelper* find_tab_helper =
  43       FindTabHelper::FromWebContents(web_contents_);
  44
  45   // Only show the animation if we're not already showing a find bar for the
  46   // selected WebContents.
  47   if (!find_tab_helper->find_ui_active()) {
  48     MaybeSetPrepopulateText();
  49
  50     find_tab_helper->set_find_ui_active(true);
  51     find_bar_->Show(true);
  52   }
  53   find_bar_->SetFocusAndSelection();
  54 }
  55
  56 void FindBarController::EndFindSession(SelectionAction selection_action,
  57                                        ResultAction result_action) {
  58   find_bar_->Hide(true);
  59
  60   // |web_contents_| can be NULL for a number of reasons, for example when the
  61   // tab is closing. We must guard against that case. See issue 8030.
  62   if (web_contents_) {
  63     FindTabHelper* find_tab_helper =
  64         FindTabHelper::FromWebContents(web_contents_);
  65
  66     // When we hide the window, we need to notify the renderer that we are done
  67     // for now, so that we can abort the scoping effort and clear all the
  68     // tickmarks and highlighting.
  69     find_tab_helper->StopFinding(selection_action);
  70
  71     if (result_action == kClearResultsInFindBox)
  72       find_bar_->ClearResults(find_tab_helper->find_result());
  73
  74     // When we get dismissed we restore the focus to where it belongs.
  75     find_bar_->RestoreSavedFocus();
  76   }
  77 }
  78
  79 void FindBarController::ChangeWebContents(WebContents* contents) {
  80   if (web_contents_) {
  81     registrar_.RemoveAll();
  82     find_bar_->StopAnimation();
  83
  84     FindTabHelper* find_tab_helper =
  85         FindTabHelper::FromWebContents(web_contents_);
  86     if (find_tab_helper)
  87       find_tab_helper->set_selected_range(find_bar_->GetSelectedRange());
  88   }
  89
  90   web_contents_ = contents;
  91   FindTabHelper* find_tab_helper =
  92       web_contents_ ? FindTabHelper::FromWebContents(web_contents_)
  93                     : NULL;
  94
  95   // Hide any visible find window from the previous tab if a NULL tab contents
  96   // is passed in or if the find UI is not active in the new tab.
  97   if (find_bar_->IsFindBarVisible() &&
  98       (!find_tab_helper || !find_tab_helper->find_ui_active())) {
  99     find_bar_->Hide(false);
 100   }
 101
 102   if (!web_contents_)
 103     return;
 104
 105   registrar_.Add(this,
 106                  chrome::NOTIFICATION_FIND_RESULT_AVAILABLE,
 107                  content::Source<WebContents>(web_contents_));
 108   registrar_.Add(
 109       this,
 110       content::NOTIFICATION_NAV_ENTRY_COMMITTED,
 111       content::Source<NavigationController>(&web_contents_->GetController()));
 112
 113   MaybeSetPrepopulateText();
 114
 115   if (find_tab_helper && find_tab_helper->find_ui_active()) {
 116     // A tab with a visible find bar just got selected and we need to show the
 117     // find bar but without animation since it was already animated into its
 118     // visible state. We also want to reset the window location so that
 119     // we don't surprise the user by popping up to the left for no apparent
 120     // reason.
 121     find_bar_->Show(false);
 122   }
 123
 124   UpdateFindBarForCurrentResult();
 125   find_bar_->UpdateFindBarForChangedWebContents();
 126 }
 127
 128 ////////////////////////////////////////////////////////////////////////////////
 129 // FindBarHost, content::NotificationObserver implementation:
 130
 131 void FindBarController::Observe(int type,
 132                                 const content::NotificationSource& source,
 133                                 const content::NotificationDetails& details) {
 134   FindTabHelper* find_tab_helper =
 135       FindTabHelper::FromWebContents(web_contents_);
 136   if (type == chrome::NOTIFICATION_FIND_RESULT_AVAILABLE) {
 137     // Don't update for notifications from WebContentses other than the one we
 138     // are actively tracking.
 139     if (content::Source<WebContents>(source).ptr() == web_contents_) {
 140       UpdateFindBarForCurrentResult();
 141       if (find_tab_helper->find_result().final_update() &&
 142           find_tab_helper->find_result().number_of_matches() == 0) {
 143         const base::string16& last_search =
 144             find_tab_helper->previous_find_text();
 145         const base::string16& current_search = find_tab_helper->find_text();
 146         if (last_search.find(current_search) != 0)
 147           find_bar_->AudibleAlert();
 148       }
 149     }
 150   } else if (type == content::NOTIFICATION_NAV_ENTRY_COMMITTED) {
 151     NavigationController* source_controller =
 152         content::Source<NavigationController>(source).ptr();
 153     if (source_controller == &web_contents_->GetController()) {
 154       content::LoadCommittedDetails* commit_details =
 155           content::Details<content::LoadCommittedDetails>(details).ptr();
 156       ui::PageTransition transition_type =
 157           commit_details->entry->GetTransitionType();
 158       // Hide the find bar on reload or navigation.
 159       if (find_bar_->IsFindBarVisible() &&
 160           (ui::PageTransitionStripQualifier(transition_type) ==
 161                ui::PAGE_TRANSITION_RELOAD ||
 162            commit_details->is_navigation_to_different_page()))
 163         EndFindSession(kKeepSelectionOnPage, kClearResultsInFindBox);
 164     }
 165   }
 166 }
 167
 168 // static
 169 gfx::Rect FindBarController::GetLocationForFindbarView(
 170     gfx::Rect view_location,
 171     const gfx::Rect& dialog_bounds,
 172     const gfx::Rect& avoid_overlapping_rect) {
 173   if (base::i18n::IsRTL()) {
 174     int boundary = dialog_bounds.width() - view_location.width();
 175     view_location.set_x(std::min(view_location.x(), boundary));
 176   } else {
 177     view_location.set_x(std::max(view_location.x(), dialog_bounds.x()));
 178   }
 179
 180   gfx::Rect new_pos = view_location;
 181
 182   // If the selection rectangle intersects the current position on screen then
 183   // we try to move our dialog to the left (right for RTL) of the selection
 184   // rectangle.
 185   if (!avoid_overlapping_rect.IsEmpty() &&
 186       avoid_overlapping_rect.Intersects(new_pos)) {
 187     if (base::i18n::IsRTL()) {
 188       new_pos.set_x(avoid_overlapping_rect.x() +
 189                     avoid_overlapping_rect.width() +
 190                     (2 * kMinFindWndDistanceFromSelection));
 191
 192       // If we moved it off-screen to the right, we won't move it at all.
 193       if (new_pos.x() + new_pos.width() > dialog_bounds.width())
 194         new_pos = view_location;  // Reset.
 195     } else {
 196       new_pos.set_x(avoid_overlapping_rect.x() - new_pos.width() -
 197         kMinFindWndDistanceFromSelection);
 198
 199       // If we moved it off-screen to the left, we won't move it at all.
 200       if (new_pos.x() < 0)
 201         new_pos = view_location;  // Reset.
 202     }
 203   }
 204
 205   return new_pos;
 206 }
 207
 208 void FindBarController::UpdateFindBarForCurrentResult() {
 209   FindTabHelper* find_tab_helper =
 210       FindTabHelper::FromWebContents(web_contents_);
 211   const FindNotificationDetails& find_result = find_tab_helper->find_result();
 212
 213   // Avoid bug 894389: When a new search starts (and finds something) it reports
 214   // an interim match count result of 1 before the scoping effort starts. This
 215   // is to provide feedback as early as possible that we will find something.
 216   // As you add letters to the search term, this creates a flashing effect when
 217   // we briefly show "1 of 1" matches because there is a slight delay until
 218   // the scoping effort starts updating the match count. We avoid this flash by
 219   // ignoring interim results of 1 if we already have a positive number.
 220   if (find_result.number_of_matches() > -1) {
 221     if (last_reported_matchcount_ > 0 &&
 222         find_result.number_of_matches() == 1 &&
 223         !find_result.final_update())
 224       return;  // Don't let interim result override match count.
 225     last_reported_matchcount_ = find_result.number_of_matches();
 226   }
 227
 228   find_bar_->UpdateUIForFindResult(find_result, find_tab_helper->find_text());
 229 }
 230
 231 void FindBarController::MaybeSetPrepopulateText() {
 232   // Having a per-tab find_string is not compatible with a global find
 233   // pasteboard, so we always have the same find text in all find bars. This is
 234   // done through the find pasteboard mechanism, so don't set the text here.
 235   if (find_bar_->HasGlobalFindPasteboard())
 236     return;
 237
 238   // Find out what we should show in the find text box. Usually, this will be
 239   // the last search in this tab, but if no search has been issued in this tab
 240   // we use the last search string (from any tab).
 241   FindTabHelper* find_tab_helper =
 242       FindTabHelper::FromWebContents(web_contents_);
 243   base::string16 find_string = find_tab_helper->find_text();
 244   if (find_string.empty())
 245     find_string = find_tab_helper->previous_find_text();
 246   if (find_string.empty()) {
 247     Profile* profile =
 248         Profile::FromBrowserContext(web_contents_->GetBrowserContext());
 249     find_string = FindBarStateFactory::GetLastPrepopulateText(profile);
 250   }
 251
 252   // Update the find bar with existing results and search text, regardless of
 253   // whether or not the find bar is visible, so that if it's subsequently
 254   // shown it is showing the right state for this tab. We update the find text
 255   // _first_ since the FindBarView checks its emptiness to see if it should
 256   // clear the result count display when there's nothing in the box.
 257   find_bar_->SetFindTextAndSelectedRange(find_string,
 258                                          find_tab_helper->selected_range());
 259 }