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| 1 // Copyright (c) 2011 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 "views/focus/focus_manager.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "base/auto_reset.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "build/build_config.h" | |
| 12 #include "ui/base/accelerator_manager.h" | |
| 13 #include "ui/base/keycodes/keyboard_codes.h" | |
| 14 #include "ui/base/models/accelerator.h" | |
| 15 #include "views/focus/focus_search.h" | |
| 16 #include "views/focus/view_storage.h" | |
| 17 #include "views/focus/widget_focus_manager.h" | |
| 18 #include "views/view.h" | |
| 19 #include "views/widget/root_view.h" | |
| 20 #include "views/widget/widget.h" | |
| 21 | |
| 22 namespace views { | |
| 23 | |
| 24 FocusManager::FocusManager(Widget* widget) | |
| 25 : widget_(widget), | |
| 26 focused_view_(NULL), | |
| 27 accelerator_manager_(new ui::AcceleratorManager), | |
| 28 focus_change_reason_(kReasonDirectFocusChange), | |
| 29 is_changing_focus_(false) { | |
| 30 DCHECK(widget_); | |
| 31 stored_focused_view_storage_id_ = | |
| 32 ViewStorage::GetInstance()->CreateStorageID(); | |
| 33 } | |
| 34 | |
| 35 FocusManager::~FocusManager() { | |
| 36 } | |
| 37 | |
| 38 bool FocusManager::OnKeyEvent(const KeyEvent& event) { | |
| 39 #if defined(OS_WIN) | |
| 40 // If the focused view wants to process the key event as is, let it be. | |
| 41 // On Linux we always dispatch key events to the focused view first, so | |
| 42 // we should not do this check here. See also NativeWidgetGtk::OnKeyEvent(). | |
| 43 if (focused_view_ && focused_view_->SkipDefaultKeyEventProcessing(event)) | |
| 44 return true; | |
| 45 #endif | |
| 46 | |
| 47 // Intercept Tab related messages for focus traversal. | |
| 48 // Note that we don't do focus traversal if the root window is not part of the | |
| 49 // active window hierarchy as this would mean we have no focused view and | |
| 50 // would focus the first focusable view. | |
| 51 #if defined(OS_WIN) && !defined(USE_AURA) | |
| 52 HWND top_window = widget_->GetNativeView(); | |
| 53 HWND active_window = ::GetActiveWindow(); | |
| 54 if ((active_window == top_window || ::IsChild(active_window, top_window)) && | |
| 55 IsTabTraversalKeyEvent(event)) { | |
| 56 AdvanceFocus(event.IsShiftDown()); | |
| 57 return false; | |
| 58 } | |
| 59 #else | |
| 60 if (IsTabTraversalKeyEvent(event)) { | |
| 61 AdvanceFocus(event.IsShiftDown()); | |
| 62 return false; | |
| 63 } | |
| 64 #endif | |
| 65 | |
| 66 // Intercept arrow key messages to switch between grouped views. | |
| 67 ui::KeyboardCode key_code = event.key_code(); | |
| 68 if (focused_view_ && focused_view_->GetGroup() != -1 && | |
| 69 (key_code == ui::VKEY_UP || key_code == ui::VKEY_DOWN || | |
| 70 key_code == ui::VKEY_LEFT || key_code == ui::VKEY_RIGHT)) { | |
| 71 bool next = (key_code == ui::VKEY_RIGHT || key_code == ui::VKEY_DOWN); | |
| 72 View::Views views; | |
| 73 focused_view_->parent()->GetViewsInGroup(focused_view_->GetGroup(), &views); | |
| 74 View::Views::const_iterator i( | |
| 75 std::find(views.begin(), views.end(), focused_view_)); | |
| 76 DCHECK(i != views.end()); | |
| 77 int index = static_cast<int>(i - views.begin()); | |
| 78 index += next ? 1 : -1; | |
| 79 if (index < 0) { | |
| 80 index = static_cast<int>(views.size()) - 1; | |
| 81 } else if (index >= static_cast<int>(views.size())) { | |
| 82 index = 0; | |
| 83 } | |
| 84 SetFocusedViewWithReason(views[index], kReasonFocusTraversal); | |
| 85 return false; | |
| 86 } | |
| 87 | |
| 88 // Process keyboard accelerators. | |
| 89 // If the key combination matches an accelerator, the accelerator is | |
| 90 // triggered, otherwise the key event is processed as usual. | |
| 91 ui::Accelerator accelerator(event.key_code(), | |
| 92 event.IsShiftDown(), | |
| 93 event.IsControlDown(), | |
| 94 event.IsAltDown()); | |
| 95 if (ProcessAccelerator(accelerator)) { | |
| 96 // If a shortcut was activated for this keydown message, do not propagate | |
| 97 // the event further. | |
| 98 return false; | |
| 99 } | |
| 100 return true; | |
| 101 } | |
| 102 | |
| 103 void FocusManager::ValidateFocusedView() { | |
| 104 if (focused_view_) { | |
| 105 if (!ContainsView(focused_view_)) | |
| 106 ClearFocus(); | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 // Tests whether a view is valid, whether it still belongs to the window | |
| 111 // hierarchy of the FocusManager. | |
| 112 bool FocusManager::ContainsView(View* view) { | |
| 113 Widget* widget = view->GetWidget(); | |
| 114 return widget ? widget->GetFocusManager() == this : false; | |
| 115 } | |
| 116 | |
| 117 void FocusManager::AdvanceFocus(bool reverse) { | |
| 118 View* v = GetNextFocusableView(focused_view_, reverse, false); | |
| 119 // Note: Do not skip this next block when v == focused_view_. If the user | |
| 120 // tabs past the last focusable element in a webpage, we'll get here, and if | |
| 121 // the TabContentsContainerView is the only focusable view (possible in | |
| 122 // fullscreen mode), we need to run this block in order to cycle around to the | |
| 123 // first element on the page. | |
| 124 if (v) { | |
| 125 v->AboutToRequestFocusFromTabTraversal(reverse); | |
| 126 SetFocusedViewWithReason(v, kReasonFocusTraversal); | |
| 127 } | |
| 128 } | |
| 129 | |
| 130 void FocusManager::ClearNativeFocus() { | |
| 131 // Keep the top root window focused so we get keyboard events. | |
| 132 widget_->ClearNativeFocus(); | |
| 133 } | |
| 134 | |
| 135 View* FocusManager::GetNextFocusableView(View* original_starting_view, | |
| 136 bool reverse, | |
| 137 bool dont_loop) { | |
| 138 FocusTraversable* focus_traversable = NULL; | |
| 139 | |
| 140 // Let's revalidate the focused view. | |
| 141 ValidateFocusedView(); | |
| 142 | |
| 143 View* starting_view = NULL; | |
| 144 if (original_starting_view) { | |
| 145 // Search up the containment hierarchy to see if a view is acting as | |
| 146 // a pane, and wants to implement its own focus traversable to keep | |
| 147 // the focus trapped within that pane. | |
| 148 View* pane_search = original_starting_view; | |
| 149 while (pane_search) { | |
| 150 focus_traversable = pane_search->GetPaneFocusTraversable(); | |
| 151 if (focus_traversable) { | |
| 152 starting_view = original_starting_view; | |
| 153 break; | |
| 154 } | |
| 155 pane_search = pane_search->parent(); | |
| 156 } | |
| 157 | |
| 158 if (!focus_traversable) { | |
| 159 if (!reverse) { | |
| 160 // If the starting view has a focus traversable, use it. | |
| 161 // This is the case with NativeWidgetWins for example. | |
| 162 focus_traversable = original_starting_view->GetFocusTraversable(); | |
| 163 | |
| 164 // Otherwise default to the root view. | |
| 165 if (!focus_traversable) { | |
| 166 focus_traversable = | |
| 167 original_starting_view->GetWidget()->GetFocusTraversable(); | |
| 168 starting_view = original_starting_view; | |
| 169 } | |
| 170 } else { | |
| 171 // When you are going back, starting view's FocusTraversable | |
| 172 // should not be used. | |
| 173 focus_traversable = | |
| 174 original_starting_view->GetWidget()->GetFocusTraversable(); | |
| 175 starting_view = original_starting_view; | |
| 176 } | |
| 177 } | |
| 178 } else { | |
| 179 focus_traversable = widget_->GetFocusTraversable(); | |
| 180 } | |
| 181 | |
| 182 // Traverse the FocusTraversable tree down to find the focusable view. | |
| 183 View* v = FindFocusableView(focus_traversable, starting_view, reverse); | |
| 184 if (v) { | |
| 185 return v; | |
| 186 } else { | |
| 187 // Let's go up in the FocusTraversable tree. | |
| 188 FocusTraversable* parent_focus_traversable = | |
| 189 focus_traversable->GetFocusTraversableParent(); | |
| 190 starting_view = focus_traversable->GetFocusTraversableParentView(); | |
| 191 while (parent_focus_traversable) { | |
| 192 FocusTraversable* new_focus_traversable = NULL; | |
| 193 View* new_starting_view = NULL; | |
| 194 // When we are going backward, the parent view might gain the next focus. | |
| 195 bool check_starting_view = reverse; | |
| 196 v = parent_focus_traversable->GetFocusSearch()->FindNextFocusableView( | |
| 197 starting_view, reverse, FocusSearch::UP, | |
| 198 check_starting_view, &new_focus_traversable, &new_starting_view); | |
| 199 | |
| 200 if (new_focus_traversable) { | |
| 201 DCHECK(!v); | |
| 202 | |
| 203 // There is a FocusTraversable, traverse it down. | |
| 204 v = FindFocusableView(new_focus_traversable, NULL, reverse); | |
| 205 } | |
| 206 | |
| 207 if (v) | |
| 208 return v; | |
| 209 | |
| 210 starting_view = focus_traversable->GetFocusTraversableParentView(); | |
| 211 parent_focus_traversable = | |
| 212 parent_focus_traversable->GetFocusTraversableParent(); | |
| 213 } | |
| 214 | |
| 215 // If we get here, we have reached the end of the focus hierarchy, let's | |
| 216 // loop. Make sure there was at least a view to start with, to prevent | |
| 217 // infinitely looping in empty windows. | |
| 218 if (!dont_loop && original_starting_view) { | |
| 219 // Easy, just clear the selection and press tab again. | |
| 220 // By calling with NULL as the starting view, we'll start from the | |
| 221 // top_root_view. | |
| 222 return GetNextFocusableView(NULL, reverse, true); | |
| 223 } | |
| 224 } | |
| 225 return NULL; | |
| 226 } | |
| 227 | |
| 228 void FocusManager::SetFocusedViewWithReason( | |
| 229 View* view, FocusChangeReason reason) { | |
| 230 if (focused_view_ == view) | |
| 231 return; | |
| 232 | |
| 233 AutoReset<bool> auto_changing_focus(&is_changing_focus_, true); | |
| 234 // Update the reason for the focus change (since this is checked by | |
| 235 // some listeners), then notify all listeners. | |
| 236 focus_change_reason_ = reason; | |
| 237 FOR_EACH_OBSERVER(FocusChangeListener, focus_change_listeners_, | |
| 238 OnWillChangeFocus(focused_view_, view)); | |
| 239 | |
| 240 View* old_focused_view = focused_view_; | |
| 241 focused_view_ = view; | |
| 242 if (old_focused_view) | |
| 243 old_focused_view->Blur(); | |
| 244 if (focused_view_) | |
| 245 focused_view_->Focus(); | |
| 246 | |
| 247 FOR_EACH_OBSERVER(FocusChangeListener, focus_change_listeners_, | |
| 248 OnDidChangeFocus(old_focused_view, focused_view_)); | |
| 249 } | |
| 250 | |
| 251 void FocusManager::ClearFocus() { | |
| 252 SetFocusedView(NULL); | |
| 253 ClearNativeFocus(); | |
| 254 } | |
| 255 | |
| 256 void FocusManager::StoreFocusedView() { | |
| 257 ViewStorage* view_storage = ViewStorage::GetInstance(); | |
| 258 if (!view_storage) { | |
| 259 // This should never happen but bug 981648 seems to indicate it could. | |
| 260 NOTREACHED(); | |
| 261 return; | |
| 262 } | |
| 263 | |
| 264 // TODO (jcampan): when a TabContents containing a popup is closed, the focus | |
| 265 // is stored twice causing an assert. We should find a better alternative than | |
| 266 // removing the view from the storage explicitly. | |
| 267 view_storage->RemoveView(stored_focused_view_storage_id_); | |
| 268 | |
| 269 if (!focused_view_) | |
| 270 return; | |
| 271 | |
| 272 view_storage->StoreView(stored_focused_view_storage_id_, focused_view_); | |
| 273 | |
| 274 View* v = focused_view_; | |
| 275 | |
| 276 { | |
| 277 // Temporarily disable notification. ClearFocus() will set the focus to the | |
| 278 // main browser window. This extra focus bounce which happens during | |
| 279 // deactivation can confuse registered WidgetFocusListeners, as the focus | |
| 280 // is not changing due to a user-initiated event. | |
| 281 AutoNativeNotificationDisabler local_notification_disabler; | |
| 282 ClearFocus(); | |
| 283 } | |
| 284 | |
| 285 if (v) | |
| 286 v->SchedulePaint(); // Remove focus border. | |
| 287 } | |
| 288 | |
| 289 void FocusManager::RestoreFocusedView() { | |
| 290 ViewStorage* view_storage = ViewStorage::GetInstance(); | |
| 291 if (!view_storage) { | |
| 292 // This should never happen but bug 981648 seems to indicate it could. | |
| 293 NOTREACHED(); | |
| 294 return; | |
| 295 } | |
| 296 | |
| 297 View* view = view_storage->RetrieveView(stored_focused_view_storage_id_); | |
| 298 if (view) { | |
| 299 if (ContainsView(view)) { | |
| 300 if (!view->IsFocusableInRootView() && | |
| 301 view->IsAccessibilityFocusableInRootView()) { | |
| 302 // RequestFocus would fail, but we want to restore focus to controls | |
| 303 // that had focus in accessibility mode. | |
| 304 SetFocusedViewWithReason(view, kReasonFocusRestore); | |
| 305 } else { | |
| 306 // This usually just sets the focus if this view is focusable, but | |
| 307 // let the view override RequestFocus if necessary. | |
| 308 view->RequestFocus(); | |
| 309 | |
| 310 // If it succeeded, the reason would be incorrect; set it to | |
| 311 // focus restore. | |
| 312 if (focused_view_ == view) | |
| 313 focus_change_reason_ = kReasonFocusRestore; | |
| 314 } | |
| 315 } | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 void FocusManager::ClearStoredFocusedView() { | |
| 320 ViewStorage* view_storage = ViewStorage::GetInstance(); | |
| 321 if (!view_storage) { | |
| 322 // This should never happen but bug 981648 seems to indicate it could. | |
| 323 NOTREACHED(); | |
| 324 return; | |
| 325 } | |
| 326 view_storage->RemoveView(stored_focused_view_storage_id_); | |
| 327 } | |
| 328 | |
| 329 // Find the next (previous if reverse is true) focusable view for the specified | |
| 330 // FocusTraversable, starting at the specified view, traversing down the | |
| 331 // FocusTraversable hierarchy. | |
| 332 View* FocusManager::FindFocusableView(FocusTraversable* focus_traversable, | |
| 333 View* starting_view, | |
| 334 bool reverse) { | |
| 335 FocusTraversable* new_focus_traversable = NULL; | |
| 336 View* new_starting_view = NULL; | |
| 337 View* v = focus_traversable->GetFocusSearch()->FindNextFocusableView( | |
| 338 starting_view, | |
| 339 reverse, | |
| 340 FocusSearch::DOWN, | |
| 341 false, | |
| 342 &new_focus_traversable, | |
| 343 &new_starting_view); | |
| 344 | |
| 345 // Let's go down the FocusTraversable tree as much as we can. | |
| 346 while (new_focus_traversable) { | |
| 347 DCHECK(!v); | |
| 348 focus_traversable = new_focus_traversable; | |
| 349 starting_view = new_starting_view; | |
| 350 new_focus_traversable = NULL; | |
| 351 starting_view = NULL; | |
| 352 v = focus_traversable->GetFocusSearch()->FindNextFocusableView( | |
| 353 starting_view, | |
| 354 reverse, | |
| 355 FocusSearch::DOWN, | |
| 356 false, | |
| 357 &new_focus_traversable, | |
| 358 &new_starting_view); | |
| 359 } | |
| 360 return v; | |
| 361 } | |
| 362 | |
| 363 void FocusManager::RegisterAccelerator( | |
| 364 const ui::Accelerator& accelerator, | |
| 365 ui::AcceleratorTarget* target) { | |
| 366 accelerator_manager_->Register(accelerator, target); | |
| 367 } | |
| 368 | |
| 369 void FocusManager::UnregisterAccelerator(const ui::Accelerator& accelerator, | |
| 370 ui::AcceleratorTarget* target) { | |
| 371 accelerator_manager_->Unregister(accelerator, target); | |
| 372 } | |
| 373 | |
| 374 void FocusManager::UnregisterAccelerators(ui::AcceleratorTarget* target) { | |
| 375 accelerator_manager_->UnregisterAll(target); | |
| 376 } | |
| 377 | |
| 378 bool FocusManager::ProcessAccelerator(const ui::Accelerator& accelerator) { | |
| 379 return accelerator_manager_->Process(accelerator); | |
| 380 } | |
| 381 | |
| 382 ui::AcceleratorTarget* FocusManager::GetCurrentTargetForAccelerator( | |
| 383 const ui::Accelerator& accelerator) const { | |
| 384 return accelerator_manager_->GetCurrentTarget(accelerator); | |
| 385 } | |
| 386 | |
| 387 void FocusManager::FocusNativeView(gfx::NativeView native_view) { | |
| 388 widget_->FocusNativeView(native_view); | |
| 389 } | |
| 390 | |
| 391 // static | |
| 392 bool FocusManager::IsTabTraversalKeyEvent(const KeyEvent& key_event) { | |
| 393 return key_event.key_code() == ui::VKEY_TAB && !key_event.IsControlDown(); | |
| 394 } | |
| 395 | |
| 396 void FocusManager::ViewRemoved(View* removed) { | |
| 397 // If the view being removed contains (or is) the focused view, | |
| 398 // clear the focus. However, it's not safe to call ClearFocus() | |
| 399 // (and in turn ClearNativeFocus()) here because ViewRemoved() can | |
| 400 // be called while the top level widget is being destroyed. | |
| 401 if (focused_view_ && removed && removed->Contains(focused_view_)) | |
| 402 SetFocusedView(NULL); | |
| 403 } | |
| 404 | |
| 405 void FocusManager::AddFocusChangeListener(FocusChangeListener* listener) { | |
| 406 focus_change_listeners_.AddObserver(listener); | |
| 407 } | |
| 408 | |
| 409 void FocusManager::RemoveFocusChangeListener(FocusChangeListener* listener) { | |
| 410 focus_change_listeners_.RemoveObserver(listener); | |
| 411 } | |
| 412 | |
| 413 } // namespace views | |
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Chromium Code Reviews
Issue 8588064:
views: Move bubble, events, focus and layout to ui/views/. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src