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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/panels/panel_drag_controller.h" | |
| 6 | |
| 7 #include <stdint.h> | |
| 8 | |
| 9 #include <limits> | |
| 10 | |
| 11 #include "base/logging.h" | |
| 12 #include "chrome/browser/ui/panels/detached_panel_collection.h" | |
| 13 #include "chrome/browser/ui/panels/detached_panel_drag_handler.h" | |
| 14 #include "chrome/browser/ui/panels/docked_panel_collection.h" | |
| 15 #include "chrome/browser/ui/panels/docked_panel_drag_handler.h" | |
| 16 #include "chrome/browser/ui/panels/panel.h" | |
| 17 #include "chrome/browser/ui/panels/panel_manager.h" | |
| 18 #include "chrome/browser/ui/panels/stacked_panel_collection.h" | |
| 19 #include "chrome/browser/ui/panels/stacked_panel_drag_handler.h" | |
| 20 | |
| 21 namespace { | |
| 22 | |
| 23 // The minimum distance that the docked panel gets dragged up in order to | |
| 24 // make it free-floating. | |
| 25 const int kDetachDockedPanelThreshold = 100; | |
| 26 | |
| 27 // Indicates how close the bottom of the detached panel is to the bottom of | |
| 28 // the docked area such that the detached panel becomes docked. | |
| 29 const int kDockDetachedPanelThreshold = 30; | |
| 30 | |
| 31 // The minimum distance and overlap (in pixels) between two panels such that | |
| 32 // they can be stacked/snapped together. | |
| 33 const int kGluePanelsDistanceThreshold = 15; | |
| 34 const int kGluePanelsOverlapThreshold = 10; | |
| 35 | |
| 36 // The minimum distance between the panel edge and the screen (or work area) | |
| 37 // edge such that the panel can snap to the screen (or work area) edge. | |
| 38 const int kSnapPanelToScreenEdgeThreshold = 25; | |
| 39 | |
| 40 int GetHorizontalOverlap(const gfx::Rect& bounds1, const gfx::Rect& bounds2) { | |
| 41 // Check for no overlap. | |
| 42 if (bounds1.right() <= bounds2.x() || bounds1.x() >= bounds2.right()) | |
| 43 return 0; | |
| 44 | |
| 45 // Check for complete overlap. | |
| 46 if (bounds2.x() <= bounds1.x() && bounds1.right() <= bounds2.right()) | |
| 47 return bounds1.width(); | |
| 48 | |
| 49 if (bounds1.x() <= bounds2.x() && bounds2.right() <= bounds1.right()) | |
| 50 return bounds2.width(); | |
| 51 | |
| 52 // Compute the overlap part. | |
| 53 return (bounds1.x() < bounds2.x()) ? (bounds1.right() - bounds2.x()) | |
| 54 : (bounds2.right() - bounds1.x()); | |
| 55 } | |
| 56 | |
| 57 int GetVerticalOverlap(const gfx::Rect& bounds1, const gfx::Rect& bounds2) { | |
| 58 // Check for no overlap. | |
| 59 if (bounds1.bottom() <= bounds2.y() || bounds1.y() >= bounds2.bottom()) | |
| 60 return 0; | |
| 61 | |
| 62 // Check for complete overlap. | |
| 63 if (bounds2.y() <= bounds1.y() && bounds1.bottom() <= bounds2.bottom()) | |
| 64 return bounds1.height(); | |
| 65 | |
| 66 if (bounds1.y() <= bounds2.y() && bounds2.bottom() <= bounds1.bottom()) | |
| 67 return bounds2.height(); | |
| 68 | |
| 69 // Compute the overlap part. | |
| 70 return (bounds1.y() < bounds2.y()) ? (bounds1.bottom() - bounds2.y()) | |
| 71 : (bounds2.bottom() - bounds1.y()); | |
| 72 } | |
| 73 | |
| 74 // Return the vertical distance between the bottom edge of |top_bounds| and | |
| 75 // the top edge of |bottom_bounds|. | |
| 76 int GetVerticalDistance(const gfx::Rect& top_bounds, | |
| 77 const gfx::Rect& bottom_bounds) { | |
| 78 return abs(bottom_bounds.y() - top_bounds.bottom()); | |
| 79 } | |
| 80 | |
| 81 // Return the vertical distance between the right edge of |left_bounds| and | |
| 82 // the left edge of |right_bounds|. | |
| 83 int GetHorizontalDistance(const gfx::Rect& left_bounds, | |
| 84 const gfx::Rect& right_bounds) { | |
| 85 return abs(right_bounds.x() - left_bounds.right()); | |
| 86 } | |
| 87 | |
| 88 void SetPreviewModeForPanelAndBelow(Panel* panel, bool in_preview) { | |
| 89 StackedPanelCollection* stack = panel->stack(); | |
| 90 if (stack) { | |
| 91 bool panel_found = false; | |
| 92 for (StackedPanelCollection::Panels::const_iterator iter = | |
| 93 stack->panels().begin(); | |
| 94 iter != stack->panels().end(); ++iter) { | |
| 95 Panel* current_panel = *iter; | |
| 96 if (!panel_found && current_panel != panel) | |
| 97 continue; | |
| 98 panel_found = true; | |
| 99 if (in_preview != current_panel->in_preview_mode()) | |
| 100 current_panel->SetPreviewMode(in_preview); | |
| 101 } | |
| 102 } else { | |
| 103 panel->SetPreviewMode(in_preview); | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 } // namespace | |
| 108 | |
| 109 // static | |
| 110 int PanelDragController::GetDetachDockedPanelThresholdForTesting() { | |
| 111 return kDetachDockedPanelThreshold; | |
| 112 } | |
| 113 | |
| 114 // static | |
| 115 int PanelDragController::GetDockDetachedPanelThresholdForTesting() { | |
| 116 return kDockDetachedPanelThreshold; | |
| 117 } | |
| 118 | |
| 119 // static | |
| 120 int PanelDragController::GetGluePanelDistanceThresholdForTesting() { | |
| 121 return kGluePanelsDistanceThreshold; | |
| 122 } | |
| 123 | |
| 124 // static | |
| 125 int PanelDragController::GetGluePanelOverlapThresholdForTesting() { | |
| 126 return kGluePanelsOverlapThreshold; | |
| 127 } | |
| 128 | |
| 129 // static | |
| 130 int PanelDragController::GetSnapPanelToScreenEdgeThresholdForTesting() { | |
| 131 return kSnapPanelToScreenEdgeThreshold; | |
| 132 } | |
| 133 | |
| 134 PanelDragController::PanelDragController(PanelManager* panel_manager) | |
| 135 : panel_manager_(panel_manager), | |
| 136 panel_stacking_enabled_(PanelManager::IsPanelStackingEnabled()), | |
| 137 dragging_panel_(NULL), | |
| 138 dragging_panel_original_collection_(NULL) { | |
| 139 } | |
| 140 | |
| 141 PanelDragController::~PanelDragController() { | |
| 142 } | |
| 143 | |
| 144 void PanelDragController::StartDragging(Panel* panel, | |
| 145 const gfx::Point& mouse_location) { | |
| 146 DCHECK(!dragging_panel_); | |
| 147 | |
| 148 offset_from_mouse_location_on_drag_start_ = | |
| 149 mouse_location - panel->GetBounds().origin(); | |
| 150 | |
| 151 dragging_panel_ = panel; | |
| 152 SetPreviewModeForPanelAndBelow(dragging_panel_, true); | |
| 153 | |
| 154 // Keep track of original collection and placement for the case that the drag | |
| 155 // is cancelled. | |
| 156 dragging_panel_original_collection_ = dragging_panel_->collection(); | |
| 157 dragging_panel_original_collection_->SavePanelPlacement(dragging_panel_); | |
| 158 } | |
| 159 | |
| 160 void PanelDragController::Drag(const gfx::Point& mouse_location) { | |
| 161 if (!dragging_panel_) | |
| 162 return; | |
| 163 | |
| 164 gfx::Point target_position = GetPanelPositionForMouseLocation(mouse_location); | |
| 165 | |
| 166 if (panel_stacking_enabled_) { | |
| 167 // Check if the dragging panel can be moved out the stack. Note that this | |
| 168 // has to be done first and we should continue processing it for the case | |
| 169 // that the drag also triggers stacking and docking. | |
| 170 // Note that the panel can only be unstacked from top or bottom. So if | |
| 171 // unstacking from top succeeds, there is no need to check for unstacking | |
| 172 // from bottom. | |
| 173 if (!TryUnstackFromTop(target_position)) | |
| 174 TryUnstackFromBottom(target_position); | |
| 175 | |
| 176 // Check if the dragging panel can stack with other panel or stack. | |
| 177 TryStack(target_position); | |
| 178 } | |
| 179 | |
| 180 // Check if the dragging panel can be docked. | |
| 181 TryDock(target_position); | |
| 182 | |
| 183 // Check if the dragging panel can be detached. | |
| 184 TryDetach(target_position); | |
| 185 | |
| 186 // Check if the dragging panel can snap to other panel or edge of the working | |
| 187 // area. | |
| 188 if (panel_stacking_enabled_) | |
| 189 TrySnap(&target_position); | |
| 190 | |
| 191 // At last, handle the drag via its collection's specific handler. | |
| 192 switch (dragging_panel_->collection()->type()) { | |
| 193 case PanelCollection::DOCKED: | |
| 194 DockedPanelDragHandler::HandleDrag(dragging_panel_, target_position); | |
| 195 break; | |
| 196 case PanelCollection::DETACHED: | |
| 197 DetachedPanelDragHandler::HandleDrag(dragging_panel_, target_position); | |
| 198 break; | |
| 199 case PanelCollection::STACKED: | |
| 200 StackedPanelDragHandler::HandleDrag( | |
| 201 dragging_panel_, | |
| 202 target_position, | |
| 203 dragging_panel_->collection() == dragging_panel_original_collection_); | |
| 204 break; | |
| 205 default: | |
| 206 NOTREACHED(); | |
| 207 break; | |
| 208 } | |
| 209 } | |
| 210 | |
| 211 void PanelDragController::EndDragging(bool cancelled) { | |
| 212 if (!dragging_panel_) | |
| 213 return; | |
| 214 | |
| 215 PanelCollection* current_collection = dragging_panel_->collection(); | |
| 216 if (cancelled) { | |
| 217 // Restore the dragging panel to its original collection if needed. | |
| 218 // Note that the bounds of dragging panel is updated later by calling | |
| 219 // RestorePanelToSavedPlacement. | |
| 220 if (current_collection != dragging_panel_original_collection_) { | |
| 221 PanelCollection::PositioningMask positioning_mask = | |
| 222 static_cast<PanelCollection::PositioningMask>( | |
| 223 PanelCollection::DEFAULT_POSITION | | |
| 224 PanelCollection::DO_NOT_UPDATE_BOUNDS); | |
| 225 MovePanelAndBelowToCollection(dragging_panel_, | |
| 226 dragging_panel_original_collection_, | |
| 227 positioning_mask); | |
| 228 } | |
| 229 | |
| 230 // End the preview mode. | |
| 231 SetPreviewModeForPanelAndBelow(dragging_panel_, false); | |
| 232 | |
| 233 // Restore the dragging panel to its original placement. | |
| 234 dragging_panel_original_collection_->RestorePanelToSavedPlacement(); | |
| 235 } else { | |
| 236 // The saved placement is no longer needed. | |
| 237 dragging_panel_original_collection_->DiscardSavedPanelPlacement(); | |
| 238 | |
| 239 // Finalizing the drag. | |
| 240 if (current_collection->type() == PanelCollection::STACKED) | |
| 241 StackedPanelDragHandler::FinalizeDrag(dragging_panel_); | |
| 242 | |
| 243 // End the preview mode. | |
| 244 SetPreviewModeForPanelAndBelow(dragging_panel_, false); | |
| 245 | |
| 246 // This could cause the panel to be moved to its finalized position. | |
| 247 current_collection->RefreshLayout(); | |
| 248 | |
| 249 // This could cause the detached panel, that still keeps its minimized state | |
| 250 // when it gets detached due to unstacking, to expand. This could occur | |
| 251 // when the stack has more than 2 panels and the 2nd top panel is unstacked | |
| 252 // from the top panel: the top panel is detached while all other panels | |
| 253 // remain in the stack. | |
| 254 if (current_collection != panel_manager_->detached_collection()) | |
| 255 panel_manager_->detached_collection()->RefreshLayout(); | |
| 256 } | |
| 257 | |
| 258 // If the origianl collection is a stack and it becomes empty, remove it. | |
| 259 if (dragging_panel_original_collection_->type() == PanelCollection::STACKED) { | |
| 260 StackedPanelCollection* original_stack = | |
| 261 static_cast<StackedPanelCollection*>( | |
| 262 dragging_panel_original_collection_); | |
| 263 if (original_stack->num_panels() == 0) | |
| 264 panel_manager_->RemoveStack(original_stack); | |
| 265 } | |
| 266 | |
| 267 dragging_panel_ = NULL; | |
| 268 } | |
| 269 | |
| 270 void PanelDragController::OnPanelClosed(Panel* panel) { | |
| 271 // Abort the drag only if the panel being closed is currently being dragged. | |
| 272 if (dragging_panel_ != panel) | |
| 273 return; | |
| 274 | |
| 275 dragging_panel_original_collection_->DiscardSavedPanelPlacement(); | |
| 276 dragging_panel_original_collection_ = NULL; | |
| 277 dragging_panel_ = NULL; | |
| 278 } | |
| 279 | |
| 280 gfx::Point PanelDragController::GetPanelPositionForMouseLocation( | |
| 281 const gfx::Point& mouse_location) const { | |
| 282 // The target panel position is computed based on the fact that the panel | |
| 283 // should follow the mouse movement. | |
| 284 gfx::Point target_position = | |
| 285 mouse_location - offset_from_mouse_location_on_drag_start_; | |
| 286 gfx::Rect target_bounds(target_position, dragging_panel_->GetBounds().size()); | |
| 287 | |
| 288 // Make sure that the panel's titlebar cannot be moved under the taskbar or | |
| 289 // OSX menu bar that is aligned to top screen edge. | |
| 290 gfx::Rect display_area = panel_manager_->display_settings_provider()-> | |
| 291 GetDisplayAreaMatching(target_bounds); | |
| 292 gfx::Rect work_area = panel_manager_->display_settings_provider()-> | |
| 293 GetWorkAreaMatching(target_bounds); | |
| 294 if (display_area.Contains(mouse_location) && | |
| 295 target_position.y() < work_area.y()) { | |
| 296 target_position.set_y(work_area.y()); | |
| 297 } | |
| 298 | |
| 299 return target_position; | |
| 300 } | |
| 301 | |
| 302 void PanelDragController::TryDetach(const gfx::Point& target_position) { | |
| 303 // It has to come from the docked collection. | |
| 304 if (dragging_panel_->collection()->type() != PanelCollection::DOCKED) | |
| 305 return; | |
| 306 | |
| 307 // The minimized docked panel is not allowed to detach. | |
| 308 if (dragging_panel_->IsMinimized()) | |
| 309 return; | |
| 310 | |
| 311 // Panels in the detached collection are always at their full size. | |
| 312 gfx::Rect target_bounds(target_position, dragging_panel_->full_size()); | |
| 313 | |
| 314 // To become detached, the panel should be dragged either out of the main | |
| 315 // work area or up high enough to pass certain threshold. | |
| 316 gfx::Rect target_work_area = panel_manager_->display_settings_provider()-> | |
| 317 GetWorkAreaMatching(target_bounds); | |
| 318 gfx::Rect dock_work_area = panel_manager_->docked_collection()->work_area(); | |
| 319 if (target_work_area.Contains(dock_work_area) && | |
| 320 dock_work_area.bottom() - target_bounds.bottom() < | |
| 321 kDetachDockedPanelThreshold) { | |
| 322 return; | |
| 323 } | |
| 324 | |
| 325 // Apply new panel bounds. | |
| 326 dragging_panel_->SetPanelBoundsInstantly(target_bounds); | |
| 327 | |
| 328 // Move the panel to new collection. | |
| 329 panel_manager_->MovePanelToCollection(dragging_panel_, | |
| 330 panel_manager_->detached_collection(), | |
| 331 PanelCollection::KNOWN_POSITION); | |
| 332 } | |
| 333 | |
| 334 void PanelDragController::TryDock(const gfx::Point& target_position) { | |
| 335 // It has to come from the detached collection. | |
| 336 if (dragging_panel_->collection()->type() != PanelCollection::DETACHED) | |
| 337 return; | |
| 338 | |
| 339 gfx::Rect target_bounds(target_position, dragging_panel_->GetBounds().size()); | |
| 340 | |
| 341 // To become docked, the panel should fall within the main work area and | |
| 342 // its bottom should come very close to or fall below the bottom of the main | |
| 343 // work area. | |
| 344 gfx::Rect target_work_area = panel_manager_->display_settings_provider()-> | |
| 345 GetWorkAreaMatching(target_bounds); | |
| 346 gfx::Rect dock_work_area = panel_manager_->docked_collection()->work_area(); | |
| 347 if (!target_work_area.Contains(dock_work_area) || | |
| 348 dock_work_area.bottom() - target_bounds.bottom() > | |
| 349 kDockDetachedPanelThreshold) { | |
| 350 return; | |
| 351 } | |
| 352 | |
| 353 // Apply new panel bounds. | |
| 354 dragging_panel_->SetPanelBoundsInstantly(target_bounds); | |
| 355 | |
| 356 // Move the panel to new collection. | |
| 357 panel_manager_->MovePanelToCollection(dragging_panel_, | |
| 358 panel_manager_->docked_collection(), | |
| 359 PanelCollection::KNOWN_POSITION); | |
| 360 } | |
| 361 | |
| 362 void PanelDragController::TryStack(const gfx::Point& target_position) { | |
| 363 gfx::Rect target_bounds; | |
| 364 GlueEdge target_edge; | |
| 365 Panel* target_panel = FindPanelToGlue(target_position, | |
| 366 STACK, | |
| 367 &target_bounds, | |
| 368 &target_edge); | |
| 369 if (!target_panel) | |
| 370 return; | |
| 371 | |
| 372 StackedPanelCollection* dragging_stack = dragging_panel_->stack(); | |
| 373 | |
| 374 // Move the panel (and all the panels below if in a stack) to the new | |
| 375 // position. | |
| 376 gfx::Vector2d delta = | |
| 377 target_bounds.origin() - dragging_panel_->GetBounds().origin(); | |
| 378 if (dragging_stack) | |
| 379 dragging_stack->MoveAllDraggingPanelsInstantly(delta); | |
| 380 else | |
| 381 dragging_panel_->MoveByInstantly(delta); | |
| 382 | |
| 383 // If the panel to stack with is not in a stack, create it now. | |
| 384 StackedPanelCollection* target_stack = target_panel->stack(); | |
| 385 if (!target_stack) { | |
| 386 target_stack = panel_manager_->CreateStack(); | |
| 387 panel_manager_->MovePanelToCollection(target_panel, | |
| 388 target_stack, | |
| 389 PanelCollection::DEFAULT_POSITION); | |
| 390 } | |
| 391 | |
| 392 // Move the panel to new collection. | |
| 393 // Note that we don't want to refresh the layout now because when we add | |
| 394 // a panel to top of other panel, we don't want the bottom panel to change | |
| 395 // its width to be same as top panel now. | |
| 396 PanelCollection::PositioningMask positioning_mask = | |
| 397 static_cast<PanelCollection::PositioningMask>( | |
| 398 PanelCollection::NO_LAYOUT_REFRESH | | |
| 399 (target_edge == TOP_EDGE ? PanelCollection::TOP_POSITION | |
| 400 : PanelCollection::DEFAULT_POSITION)); | |
| 401 MovePanelAndBelowToCollection(dragging_panel_, | |
| 402 target_stack, | |
| 403 positioning_mask); | |
| 404 } | |
| 405 | |
| 406 // Check if a panel or a set of stacked panels (being dragged together from a | |
| 407 // stack) can be dragged away from the panel below such that the former panel(s) | |
| 408 // are not in the same stack as the latter panel. | |
| 409 bool PanelDragController::TryUnstackFromTop(const gfx::Point& target_position) { | |
| 410 // It has to be stacked. | |
| 411 StackedPanelCollection* dragging_stack = dragging_panel_->stack(); | |
| 412 if (!dragging_stack) | |
| 413 return false; | |
| 414 | |
| 415 // Unstacking from top only happens when a panel/stack stacks to the top of | |
| 416 // another panel and then moves away while the drag is still in progress. | |
| 417 if (dragging_panel_ != dragging_stack->top_panel() || | |
| 418 dragging_stack == dragging_panel_original_collection_) | |
| 419 return false; | |
| 420 | |
| 421 // Count the number of panels that might need to unstack. | |
| 422 Panel* last_panel_to_unstack = NULL; | |
| 423 Panel* panel_below_last_panel_to_unstack = NULL; | |
| 424 int num_panels_to_unstack = 0; | |
| 425 for (StackedPanelCollection::Panels::const_iterator iter = | |
| 426 dragging_stack->panels().begin(); | |
| 427 iter != dragging_stack->panels().end(); ++iter) { | |
| 428 if (!(*iter)->in_preview_mode()) { | |
| 429 panel_below_last_panel_to_unstack = *iter; | |
| 430 break; | |
| 431 } | |
| 432 num_panels_to_unstack++; | |
| 433 last_panel_to_unstack = *iter; | |
| 434 } | |
| 435 DCHECK_GE(num_panels_to_unstack, 1); | |
| 436 if (num_panels_to_unstack == dragging_stack->num_panels()) | |
| 437 return false; | |
| 438 | |
| 439 gfx::Vector2d delta = target_position - dragging_panel_->GetBounds().origin(); | |
| 440 | |
| 441 // The last panel to unstack should be dragged far enough from its below | |
| 442 // panel. | |
| 443 gfx::Rect target_bounds = last_panel_to_unstack->GetBounds(); | |
| 444 target_bounds.Offset(delta); | |
| 445 gfx::Rect below_panel_bounds = panel_below_last_panel_to_unstack->GetBounds(); | |
| 446 if (GetVerticalDistance(target_bounds, below_panel_bounds) < | |
| 447 kGluePanelsDistanceThreshold && | |
| 448 GetHorizontalOverlap(target_bounds, below_panel_bounds) > | |
| 449 kGluePanelsOverlapThreshold) { | |
| 450 return false; | |
| 451 } | |
| 452 | |
| 453 int num_panels_in_stack = dragging_stack->num_panels(); | |
| 454 DCHECK_GE(num_panels_in_stack, 2); | |
| 455 | |
| 456 // When a panel is removed from its stack, we always make it detached. If it | |
| 457 // indeed should go to the docked collection, the subsequent TryDock will then | |
| 458 // move it from the detached collection to the docked collection. | |
| 459 DetachedPanelCollection* detached_collection = | |
| 460 panel_manager_->detached_collection(); | |
| 461 | |
| 462 // If there're only 2 panels in the stack, both panels should move out of the | |
| 463 // stack and the stack should be removed. | |
| 464 if (num_panels_in_stack == 2) { | |
| 465 DCHECK_EQ(1, num_panels_to_unstack); | |
| 466 MovePanelAndBelowToCollection(dragging_panel_, | |
| 467 detached_collection, | |
| 468 PanelCollection::KNOWN_POSITION); | |
| 469 dragging_panel_->MoveByInstantly(delta); | |
| 470 return true; | |
| 471 } | |
| 472 | |
| 473 DCHECK_GE(num_panels_in_stack, 3); | |
| 474 | |
| 475 // If only one panel (top panel) needs to unstack, move it out of the stack. | |
| 476 if (num_panels_to_unstack == 1) { | |
| 477 panel_manager_->MovePanelToCollection(dragging_panel_, | |
| 478 detached_collection, | |
| 479 PanelCollection::KNOWN_POSITION); | |
| 480 dragging_panel_->MoveByInstantly(delta); | |
| 481 return true; | |
| 482 } | |
| 483 | |
| 484 // If all the panels except the bottom panel need to unstack, simply move | |
| 485 // bottom panel out of the stack. | |
| 486 if (num_panels_in_stack - num_panels_to_unstack == 1) { | |
| 487 panel_manager_->MovePanelToCollection(dragging_stack->bottom_panel(), | |
| 488 detached_collection, | |
| 489 PanelCollection::KNOWN_POSITION); | |
| 490 dragging_panel_->stack()->MoveAllDraggingPanelsInstantly(delta); | |
| 491 return true; | |
| 492 } | |
| 493 | |
| 494 // Otherwise, move all unstacked panels to a new stack. | |
| 495 // Note that all the panels to move should be copied to a local list first | |
| 496 // because the stack collection will be modified during the move. | |
| 497 std::list<Panel*> panels_to_move; | |
| 498 for (StackedPanelCollection::Panels::const_iterator iter = | |
| 499 dragging_stack->panels().begin(); | |
| 500 iter != dragging_stack->panels().end(); ++iter) { | |
| 501 Panel* panel = *iter; | |
| 502 if (!panel->in_preview_mode()) | |
| 503 break; | |
| 504 panels_to_move.push_back(panel); | |
| 505 } | |
| 506 StackedPanelCollection* new_stack = panel_manager_->CreateStack(); | |
| 507 for (std::list<Panel*>::const_iterator iter = panels_to_move.begin(); | |
| 508 iter != panels_to_move.end(); ++iter) { | |
| 509 panel_manager_->MovePanelToCollection(*iter, | |
| 510 new_stack, | |
| 511 PanelCollection::KNOWN_POSITION); | |
| 512 } | |
| 513 dragging_panel_->stack()->MoveAllDraggingPanelsInstantly(delta); | |
| 514 | |
| 515 return true; | |
| 516 } | |
| 517 | |
| 518 // Check if a panel or a set of stacked panels (being dragged together from a | |
| 519 // stack) can be dragged away from the panel above such that the former panel(s) | |
| 520 // are not in the same stack as the latter panel. | |
| 521 bool PanelDragController::TryUnstackFromBottom( | |
| 522 const gfx::Point& target_position) { | |
| 523 // It has to be stacked. | |
| 524 StackedPanelCollection* dragging_stack = dragging_panel_->stack(); | |
| 525 if (!dragging_stack) | |
| 526 return false; | |
| 527 | |
| 528 // It cannot be the top panel. | |
| 529 if (dragging_panel_ == dragging_stack->top_panel()) | |
| 530 return false; | |
| 531 | |
| 532 DCHECK_GT(dragging_stack->num_panels(), 1); | |
| 533 | |
| 534 gfx::Rect target_bounds(target_position, dragging_panel_->GetBounds().size()); | |
| 535 | |
| 536 // The panel should be dragged far enough from its above panel. | |
| 537 Panel* above_panel = dragging_stack->GetPanelAbove(dragging_panel_); | |
| 538 DCHECK(above_panel); | |
| 539 gfx::Rect above_panel_bounds = above_panel->GetBounds(); | |
| 540 if (GetVerticalDistance(above_panel_bounds, target_bounds) < | |
| 541 kGluePanelsDistanceThreshold && | |
| 542 GetHorizontalOverlap(above_panel_bounds, target_bounds) > | |
| 543 kGluePanelsOverlapThreshold) { | |
| 544 return false; | |
| 545 } | |
| 546 | |
| 547 gfx::Vector2d delta = target_position - dragging_panel_->GetBounds().origin(); | |
| 548 | |
| 549 // If there're only 2 panels in the stack, both panels should move out the | |
| 550 // stack and the stack should be removed. | |
| 551 DetachedPanelCollection* detached_collection = | |
| 552 panel_manager_->detached_collection(); | |
| 553 if (dragging_stack->num_panels() == 2) { | |
| 554 MovePanelAndBelowToCollection(dragging_stack->top_panel(), | |
| 555 detached_collection, | |
| 556 PanelCollection::KNOWN_POSITION); | |
| 557 dragging_panel_->MoveByInstantly(delta); | |
| 558 return true; | |
| 559 } | |
| 560 | |
| 561 // There're at least 3 panels. | |
| 562 DCHECK_GE(dragging_stack->num_panels(), 3); | |
| 563 | |
| 564 // If the dragging panel is bottom panel, move it out of the stack. | |
| 565 if (dragging_panel_ == dragging_stack->bottom_panel()) { | |
| 566 panel_manager_->MovePanelToCollection(dragging_panel_, | |
| 567 detached_collection, | |
| 568 PanelCollection::KNOWN_POSITION); | |
| 569 dragging_panel_->MoveByInstantly(delta); | |
| 570 return true; | |
| 571 } | |
| 572 | |
| 573 // If the dragging panel is the one below the top panel, move top panel | |
| 574 // out of the stack. | |
| 575 if (dragging_stack->GetPanelAbove(dragging_panel_) == | |
| 576 dragging_stack->top_panel()) { | |
| 577 panel_manager_->MovePanelToCollection(dragging_stack->top_panel(), | |
| 578 detached_collection, | |
| 579 PanelCollection::KNOWN_POSITION); | |
| 580 dragging_panel_->stack()->MoveAllDraggingPanelsInstantly(delta); | |
| 581 return true; | |
| 582 } | |
| 583 | |
| 584 // There're at least 4 panels. | |
| 585 DCHECK_GE(dragging_stack->num_panels(), 4); | |
| 586 | |
| 587 // We can split them into 2 stacks by moving the dragging panel and all panels | |
| 588 // below to a new stack while keeping all panels above in the same stack. | |
| 589 StackedPanelCollection* new_stack = panel_manager_->CreateStack(); | |
| 590 MovePanelAndBelowToCollection(dragging_panel_, | |
| 591 new_stack, | |
| 592 PanelCollection::KNOWN_POSITION); | |
| 593 dragging_panel_->stack()->MoveAllDraggingPanelsInstantly(delta); | |
| 594 | |
| 595 return true; | |
| 596 } | |
| 597 | |
| 598 void PanelDragController::TrySnap(gfx::Point* target_position) { | |
| 599 // Snapping does not apply to docked panels. | |
| 600 if (dragging_panel_->collection()->type() == PanelCollection::DOCKED) | |
| 601 return; | |
| 602 | |
| 603 // Check if the panel can snap to other panel. | |
| 604 gfx::Rect target_bounds; | |
| 605 GlueEdge target_edge; | |
| 606 Panel* target_panel = FindPanelToGlue(*target_position, | |
| 607 SNAP, | |
| 608 &target_bounds, | |
| 609 &target_edge); | |
| 610 if (target_panel) { | |
| 611 *target_position = target_bounds.origin(); | |
| 612 return; | |
| 613 } | |
| 614 | |
| 615 // Check if the panel can snap to the left/right edge of the work area. | |
| 616 target_bounds.set_origin(*target_position); | |
| 617 target_bounds.set_size(dragging_panel_->GetBounds().size()); | |
| 618 gfx::Rect work_area = panel_manager_->display_settings_provider()-> | |
| 619 GetWorkAreaMatching(target_bounds); | |
| 620 if (abs(target_position->x() - work_area.x()) < | |
| 621 kSnapPanelToScreenEdgeThreshold) { | |
| 622 target_position->set_x(work_area.x()); | |
| 623 } else { | |
| 624 int width = dragging_panel_->GetBounds().width(); | |
| 625 if (abs(work_area.right() - target_position->x() - width) < | |
| 626 kSnapPanelToScreenEdgeThreshold) | |
| 627 target_position->set_x(work_area.right() - width); | |
| 628 } | |
| 629 | |
| 630 // Check if the panel can snap to the top/bottom edge of the work area. | |
| 631 if (abs(target_position->y() - work_area.y()) < | |
| 632 kSnapPanelToScreenEdgeThreshold) { | |
| 633 target_position->set_y(work_area.y()); | |
| 634 } else { | |
| 635 // If the panel is in a stack, the height is from the top edge of this panel | |
| 636 // to the bottom edge of the last panel in the stack. | |
| 637 int height; | |
| 638 StackedPanelCollection* stack = dragging_panel_->stack(); | |
| 639 if (stack) { | |
| 640 height = stack->bottom_panel()->GetBounds().bottom() - | |
| 641 dragging_panel_->GetBounds().y(); | |
| 642 } else { | |
| 643 height = dragging_panel_->GetBounds().height(); | |
| 644 } | |
| 645 if (abs(work_area.bottom() - target_position->y() - height) < | |
| 646 kSnapPanelToScreenEdgeThreshold) | |
| 647 target_position->set_y(work_area.bottom() - height); | |
| 648 } | |
| 649 } | |
| 650 | |
| 651 Panel* PanelDragController::FindPanelToGlue( | |
| 652 const gfx::Point& potential_position, | |
| 653 GlueAction action, | |
| 654 gfx::Rect* target_bounds, | |
| 655 GlueEdge* target_edge) const { | |
| 656 int best_distance = std::numeric_limits<int32_t>::max(); | |
| 657 Panel* best_matching_panel = NULL; | |
| 658 | |
| 659 // Compute the potential bounds for the dragging panel. | |
| 660 gfx::Rect current_dragging_bounds = dragging_panel_->GetBounds(); | |
| 661 gfx::Rect potential_dragging_bounds(potential_position, | |
| 662 current_dragging_bounds.size()); | |
| 663 | |
| 664 // Compute the potential bounds for the bottom panel if the dragging panel is | |
| 665 // in a stack. If not, it is same as |potential_dragging_bounds|. | |
| 666 // This is used to determine if the dragging panel or the bottom panel can | |
| 667 // stack to the top of other panel. | |
| 668 gfx::Rect current_bottom_bounds; | |
| 669 gfx::Rect potential_bottom_bounds; | |
| 670 StackedPanelCollection* dragging_stack = dragging_panel_->stack(); | |
| 671 if (dragging_stack && dragging_panel_ != dragging_stack->bottom_panel()) { | |
| 672 gfx::Vector2d delta = potential_position - current_dragging_bounds.origin(); | |
| 673 current_bottom_bounds = dragging_stack->bottom_panel()->GetBounds(); | |
| 674 potential_bottom_bounds = current_bottom_bounds; | |
| 675 potential_bottom_bounds.Offset(delta); | |
| 676 } else { | |
| 677 current_bottom_bounds = current_dragging_bounds; | |
| 678 potential_bottom_bounds = potential_dragging_bounds; | |
| 679 } | |
| 680 | |
| 681 // Go through all non-docked panels. | |
| 682 std::vector<Panel*> panels = panel_manager_->GetDetachedAndStackedPanels(); | |
| 683 for (std::vector<Panel*>::const_iterator iter = panels.begin(); | |
| 684 iter != panels.end(); ++iter) { | |
| 685 Panel* panel = *iter; | |
| 686 if (dragging_panel_ == panel) | |
| 687 continue; | |
| 688 if (dragging_panel_->collection()->type() == PanelCollection::STACKED && | |
| 689 dragging_panel_->collection() == panel->collection()) | |
| 690 continue; | |
| 691 gfx::Rect panel_bounds = panel->GetBounds(); | |
| 692 int distance; | |
| 693 int overlap; | |
| 694 | |
| 695 if (action == SNAP) { | |
| 696 overlap = GetVerticalOverlap(potential_dragging_bounds, panel_bounds); | |
| 697 if (overlap > kGluePanelsOverlapThreshold) { | |
| 698 // Can |dragging_panel_| snap to left edge of |panel|? | |
| 699 distance = GetHorizontalDistance(potential_dragging_bounds, | |
| 700 panel_bounds); | |
| 701 if (distance < kGluePanelsDistanceThreshold && | |
| 702 distance < best_distance) { | |
| 703 best_distance = distance; | |
| 704 best_matching_panel = panel; | |
| 705 *target_edge = LEFT_EDGE; | |
| 706 *target_bounds = potential_dragging_bounds; | |
| 707 target_bounds->set_x(panel_bounds.x() - target_bounds->width()); | |
| 708 } | |
| 709 | |
| 710 // Can |dragging_panel_| snap to right edge of |panel|? | |
| 711 distance = GetHorizontalDistance(panel_bounds, | |
| 712 potential_dragging_bounds); | |
| 713 if (distance < kGluePanelsDistanceThreshold && | |
| 714 distance < best_distance) { | |
| 715 best_distance = distance; | |
| 716 best_matching_panel = panel; | |
| 717 *target_edge = RIGHT_EDGE; | |
| 718 *target_bounds = potential_dragging_bounds; | |
| 719 target_bounds->set_x(panel_bounds.right()); | |
| 720 } | |
| 721 } | |
| 722 } else { | |
| 723 DCHECK_EQ(STACK, action); | |
| 724 StackedPanelCollection* stack = panel->stack(); | |
| 725 | |
| 726 // Can |dragging_panel_| or the bottom panel in |dragging_panel_|'s stack | |
| 727 // stack to top edge of |panel|? If |panel| is in a stack and not top | |
| 728 // panel, its top edge is interior edge and thus cannot be aligned with. | |
| 729 distance = GetVerticalDistance(potential_bottom_bounds, panel_bounds); | |
| 730 overlap = GetHorizontalOverlap(panel_bounds, potential_bottom_bounds); | |
| 731 if ((!stack || panel == stack->top_panel()) && | |
| 732 distance < kGluePanelsDistanceThreshold && | |
| 733 overlap > kGluePanelsOverlapThreshold && | |
| 734 distance < best_distance) { | |
| 735 best_distance = distance; | |
| 736 best_matching_panel = panel; | |
| 737 *target_edge = TOP_EDGE; | |
| 738 target_bounds->SetRect( | |
| 739 potential_dragging_bounds.x(), | |
| 740 current_dragging_bounds.y() + panel_bounds.y() - | |
| 741 current_bottom_bounds.height() - current_bottom_bounds.y(), | |
| 742 potential_dragging_bounds.width(), | |
| 743 potential_dragging_bounds.height()); | |
| 744 } | |
| 745 | |
| 746 // Can |dragging_panel_| stack to bottom edge of |panel|? If |panel| is | |
| 747 // in a stack and not bottom panel, its bottom edge is interior edge and | |
| 748 // thus cannot be aligned with. | |
| 749 distance = GetVerticalDistance(panel_bounds, potential_dragging_bounds); | |
| 750 overlap = GetHorizontalOverlap(panel_bounds, potential_dragging_bounds); | |
| 751 if ((!stack || panel == stack->bottom_panel()) && | |
| 752 distance < kGluePanelsDistanceThreshold && | |
| 753 overlap > kGluePanelsOverlapThreshold && | |
| 754 distance < best_distance) { | |
| 755 best_distance = distance; | |
| 756 best_matching_panel = panel; | |
| 757 *target_edge = BOTTOM_EDGE; | |
| 758 target_bounds->SetRect(potential_dragging_bounds.x(), | |
| 759 panel_bounds.bottom(), | |
| 760 potential_dragging_bounds.width(), | |
| 761 potential_dragging_bounds.height()); | |
| 762 } | |
| 763 } | |
| 764 } | |
| 765 | |
| 766 return best_matching_panel; | |
| 767 } | |
| 768 | |
| 769 void PanelDragController::MovePanelAndBelowToCollection( | |
| 770 Panel* panel, | |
| 771 PanelCollection* target_collection, | |
| 772 PanelCollection::PositioningMask positioning_mask) const { | |
| 773 StackedPanelCollection* stack = panel->stack(); | |
| 774 if (!stack) { | |
| 775 panel_manager_->MovePanelToCollection(panel, | |
| 776 target_collection, | |
| 777 positioning_mask); | |
| 778 return; | |
| 779 } | |
| 780 | |
| 781 // Note that all the panels to move should be copied to a local list first | |
| 782 // because the stack collection will be modified during the move. | |
| 783 std::list<Panel*> panels_to_move; | |
| 784 StackedPanelCollection::Panels::const_iterator iter = stack->panels().begin(); | |
| 785 for (; iter != stack->panels().end(); ++iter) | |
| 786 if ((*iter) == panel) | |
| 787 break; | |
| 788 for (; iter != stack->panels().end(); ++iter) { | |
| 789 // Note that if the panels are going to be inserted from the top, we need | |
| 790 // to reverse the order when copying to the local list. | |
| 791 if (positioning_mask & PanelCollection::TOP_POSITION) | |
| 792 panels_to_move.push_front(*iter); | |
| 793 else | |
| 794 panels_to_move.push_back(*iter); | |
| 795 } | |
| 796 for (std::list<Panel*>::const_iterator panel_iter = panels_to_move.begin(); | |
| 797 panel_iter != panels_to_move.end(); ++panel_iter) { | |
| 798 panel_manager_->MovePanelToCollection(*panel_iter, | |
| 799 target_collection, | |
| 800 positioning_mask); | |
| 801 } | |
| 802 | |
| 803 // If the stack becomes empty or has only one panel left, no need to keep | |
| 804 // the stack. | |
| 805 if (stack && stack->num_panels() <= 1) { | |
| 806 if (stack->num_panels() == 1) { | |
| 807 panel_manager_->MovePanelToCollection( | |
| 808 stack->top_panel(), | |
| 809 panel_manager_->detached_collection(), | |
| 810 PanelCollection::KNOWN_POSITION); | |
| 811 } | |
| 812 // Note that if the stack is the original collection, do not remove it now. | |
| 813 // This is because the original collection contains the information to | |
| 814 // restore the dragging panel to the right place when the drag is cancelled. | |
| 815 if (stack != dragging_panel_original_collection_) | |
| 816 panel_manager_->RemoveStack(stack); | |
| 817 } | |
| 818 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2263863002:
Remove implementation of Panels on OSes other than ChromeOS. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master