| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "chrome/browser/ui/panels/panel_drag_controller.h" |
| |
| #include "base/logging.h" |
| #include "chrome/browser/ui/panels/detached_panel_collection.h" |
| #include "chrome/browser/ui/panels/detached_panel_drag_handler.h" |
| #include "chrome/browser/ui/panels/docked_panel_collection.h" |
| #include "chrome/browser/ui/panels/docked_panel_drag_handler.h" |
| #include "chrome/browser/ui/panels/panel.h" |
| #include "chrome/browser/ui/panels/panel_manager.h" |
| #include "chrome/browser/ui/panels/stacked_panel_collection.h" |
| #include "chrome/browser/ui/panels/stacked_panel_drag_handler.h" |
| |
| namespace { |
| |
| // The minimum distance that the docked panel gets dragged up in order to |
| // make it free-floating. |
| const int kDetachDockedPanelThreshold = 100; |
| |
| // Indicates how close the bottom of the detached panel is to the bottom of |
| // the docked area such that the detached panel becomes docked. |
| const int kDockDetachedPanelThreshold = 30; |
| |
| // The minimum distance and overlap (in pixels) between two panels such that |
| // they can be stacked/snapped together. |
| const int kGluePanelsDistanceThreshold = 15; |
| const int kGluePanelsOverlapThreshold = 10; |
| |
| // The minimum distance between the panel edge and the screen (or work area) |
| // edge such that the panel can snap to the screen (or work area) edge. |
| const int kSnapPanelToScreenEdgeThreshold = 25; |
| |
| int GetHorizontalOverlap(const gfx::Rect& bounds1, const gfx::Rect& bounds2) { |
| // Check for no overlap. |
| if (bounds1.right() <= bounds2.x() || bounds1.x() >= bounds2.right()) |
| return 0; |
| |
| // Check for complete overlap. |
| if (bounds2.x() <= bounds1.x() && bounds1.right() <= bounds2.right()) |
| return bounds1.width(); |
| |
| if (bounds1.x() <= bounds2.x() && bounds2.right() <= bounds1.right()) |
| return bounds2.width(); |
| |
| // Compute the overlap part. |
| return (bounds1.x() < bounds2.x()) ? (bounds1.right() - bounds2.x()) |
| : (bounds2.right() - bounds1.x()); |
| } |
| |
| int GetVerticalOverlap(const gfx::Rect& bounds1, const gfx::Rect& bounds2) { |
| // Check for no overlap. |
| if (bounds1.bottom() <= bounds2.y() || bounds1.y() >= bounds2.bottom()) |
| return 0; |
| |
| // Check for complete overlap. |
| if (bounds2.y() <= bounds1.y() && bounds1.bottom() <= bounds2.bottom()) |
| return bounds1.height(); |
| |
| if (bounds1.y() <= bounds2.y() && bounds2.bottom() <= bounds1.bottom()) |
| return bounds2.height(); |
| |
| // Compute the overlap part. |
| return (bounds1.y() < bounds2.y()) ? (bounds1.bottom() - bounds2.y()) |
| : (bounds2.bottom() - bounds1.y()); |
| } |
| |
| // Return the vertical distance between the bottom edge of |top_bounds| and |
| // the top edge of |bottom_bounds|. |
| int GetVerticalDistance(const gfx::Rect& top_bounds, |
| const gfx::Rect& bottom_bounds) { |
| return abs(bottom_bounds.y() - top_bounds.bottom()); |
| } |
| |
| // Return the vertical distance between the right edge of |left_bounds| and |
| // the left edge of |right_bounds|. |
| int GetHorizontalDistance(const gfx::Rect& left_bounds, |
| const gfx::Rect& right_bounds) { |
| return abs(right_bounds.x() - left_bounds.right()); |
| } |
| |
| void SetPreviewModeForPanelAndBelow(Panel* panel, bool in_preview) { |
| StackedPanelCollection* stack = panel->stack(); |
| if (stack) { |
| bool panel_found = false; |
| for (StackedPanelCollection::Panels::const_iterator iter = |
| stack->panels().begin(); |
| iter != stack->panels().end(); ++iter) { |
| Panel* current_panel = *iter; |
| if (!panel_found && current_panel != panel) |
| continue; |
| panel_found = true; |
| if (in_preview != current_panel->in_preview_mode()) |
| current_panel->SetPreviewMode(in_preview); |
| } |
| } else { |
| panel->SetPreviewMode(in_preview); |
| } |
| } |
| |
| } // namespace |
| |
| // static |
| int PanelDragController::GetDetachDockedPanelThresholdForTesting() { |
| return kDetachDockedPanelThreshold; |
| } |
| |
| // static |
| int PanelDragController::GetDockDetachedPanelThresholdForTesting() { |
| return kDockDetachedPanelThreshold; |
| } |
| |
| // static |
| int PanelDragController::GetGluePanelDistanceThresholdForTesting() { |
| return kGluePanelsDistanceThreshold; |
| } |
| |
| // static |
| int PanelDragController::GetGluePanelOverlapThresholdForTesting() { |
| return kGluePanelsOverlapThreshold; |
| } |
| |
| // static |
| int PanelDragController::GetSnapPanelToScreenEdgeThresholdForTesting() { |
| return kSnapPanelToScreenEdgeThreshold; |
| } |
| |
| PanelDragController::PanelDragController(PanelManager* panel_manager) |
| : panel_manager_(panel_manager), |
| panel_stacking_enabled_(PanelManager::IsPanelStackingEnabled()), |
| dragging_panel_(NULL), |
| dragging_panel_original_collection_(NULL) { |
| } |
| |
| PanelDragController::~PanelDragController() { |
| } |
| |
| void PanelDragController::StartDragging(Panel* panel, |
| const gfx::Point& mouse_location) { |
| DCHECK(!dragging_panel_); |
| |
| offset_from_mouse_location_on_drag_start_ = |
| mouse_location - panel->GetBounds().origin(); |
| |
| dragging_panel_ = panel; |
| SetPreviewModeForPanelAndBelow(dragging_panel_, true); |
| |
| // Keep track of original collection and placement for the case that the drag |
| // is cancelled. |
| dragging_panel_original_collection_ = dragging_panel_->collection(); |
| dragging_panel_original_collection_->SavePanelPlacement(dragging_panel_); |
| } |
| |
| void PanelDragController::Drag(const gfx::Point& mouse_location) { |
| if (!dragging_panel_) |
| return; |
| |
| gfx::Point target_position = GetPanelPositionForMouseLocation(mouse_location); |
| |
| if (panel_stacking_enabled_) { |
| // Check if the dragging panel can be moved out the stack. Note that this |
| // has to be done first and we should continue processing it for the case |
| // that the drag also triggers stacking and docking. |
| // Note that the panel can only be unstacked from top or bottom. So if |
| // unstacking from top succeeds, there is no need to check for unstacking |
| // from bottom. |
| if (!TryUnstackFromTop(target_position)) |
| TryUnstackFromBottom(target_position); |
| |
| // Check if the dragging panel can stack with other panel or stack. |
| TryStack(target_position); |
| } |
| |
| // Check if the dragging panel can be docked. |
| TryDock(target_position); |
| |
| // Check if the dragging panel can be detached. |
| TryDetach(target_position); |
| |
| // Check if the dragging panel can snap to other panel or edge of the working |
| // area. |
| if (panel_stacking_enabled_) |
| TrySnap(&target_position); |
| |
| // At last, handle the drag via its collection's specific handler. |
| switch (dragging_panel_->collection()->type()) { |
| case PanelCollection::DOCKED: |
| DockedPanelDragHandler::HandleDrag(dragging_panel_, target_position); |
| break; |
| case PanelCollection::DETACHED: |
| DetachedPanelDragHandler::HandleDrag(dragging_panel_, target_position); |
| break; |
| case PanelCollection::STACKED: |
| StackedPanelDragHandler::HandleDrag( |
| dragging_panel_, |
| target_position, |
| dragging_panel_->collection() == dragging_panel_original_collection_); |
| break; |
| default: |
| NOTREACHED(); |
| break; |
| } |
| } |
| |
| void PanelDragController::EndDragging(bool cancelled) { |
| if (!dragging_panel_) |
| return; |
| |
| PanelCollection* current_collection = dragging_panel_->collection(); |
| if (cancelled) { |
| // Restore the dragging panel to its original collection if needed. |
| // Note that the bounds of dragging panel is updated later by calling |
| // RestorePanelToSavedPlacement. |
| if (current_collection != dragging_panel_original_collection_) { |
| PanelCollection::PositioningMask positioning_mask = |
| static_cast<PanelCollection::PositioningMask>( |
| PanelCollection::DEFAULT_POSITION | |
| PanelCollection::DO_NOT_UPDATE_BOUNDS); |
| MovePanelAndBelowToCollection(dragging_panel_, |
| dragging_panel_original_collection_, |
| positioning_mask); |
| } |
| |
| // End the preview mode. |
| SetPreviewModeForPanelAndBelow(dragging_panel_, false); |
| |
| // Restore the dragging panel to its original placement. |
| dragging_panel_original_collection_->RestorePanelToSavedPlacement(); |
| } else { |
| // The saved placement is no longer needed. |
| dragging_panel_original_collection_->DiscardSavedPanelPlacement(); |
| |
| // Finalizing the drag. |
| if (current_collection->type() == PanelCollection::STACKED) |
| StackedPanelDragHandler::FinalizeDrag(dragging_panel_); |
| |
| // End the preview mode. |
| SetPreviewModeForPanelAndBelow(dragging_panel_, false); |
| |
| // This could cause the panel to be moved to its finalized position. |
| current_collection->RefreshLayout(); |
| |
| // This could cause the detached panel, that still keeps its minimized state |
| // when it gets detached due to unstacking, to expand. This could occur |
| // when the stack has more than 2 panels and the 2nd top panel is unstacked |
| // from the top panel: the top panel is detached while all other panels |
| // remain in the stack. |
| if (current_collection != panel_manager_->detached_collection()) |
| panel_manager_->detached_collection()->RefreshLayout(); |
| } |
| |
| // If the origianl collection is a stack and it becomes empty, remove it. |
| if (dragging_panel_original_collection_->type() == PanelCollection::STACKED) { |
| StackedPanelCollection* original_stack = |
| static_cast<StackedPanelCollection*>( |
| dragging_panel_original_collection_); |
| if (original_stack->num_panels() == 0) |
| panel_manager_->RemoveStack(original_stack); |
| } |
| |
| dragging_panel_ = NULL; |
| } |
| |
| void PanelDragController::OnPanelClosed(Panel* panel) { |
| // Abort the drag only if the panel being closed is currently being dragged. |
| if (dragging_panel_ != panel) |
| return; |
| |
| dragging_panel_original_collection_->DiscardSavedPanelPlacement(); |
| dragging_panel_original_collection_ = NULL; |
| dragging_panel_ = NULL; |
| } |
| |
| gfx::Point PanelDragController::GetPanelPositionForMouseLocation( |
| const gfx::Point& mouse_location) const { |
| // The target panel position is computed based on the fact that the panel |
| // should follow the mouse movement. |
| gfx::Point target_position = |
| mouse_location - offset_from_mouse_location_on_drag_start_; |
| gfx::Rect target_bounds(target_position, dragging_panel_->GetBounds().size()); |
| |
| // Make sure that the panel's titlebar cannot be moved under the taskbar or |
| // OSX menu bar that is aligned to top screen edge. |
| gfx::Rect display_area = panel_manager_->display_settings_provider()-> |
| GetDisplayAreaMatching(target_bounds); |
| gfx::Rect work_area = panel_manager_->display_settings_provider()-> |
| GetWorkAreaMatching(target_bounds); |
| if (display_area.Contains(mouse_location) && |
| target_position.y() < work_area.y()) { |
| target_position.set_y(work_area.y()); |
| } |
| |
| return target_position; |
| } |
| |
| void PanelDragController::TryDetach(const gfx::Point& target_position) { |
| // It has to come from the docked collection. |
| if (dragging_panel_->collection()->type() != PanelCollection::DOCKED) |
| return; |
| |
| // The minimized docked panel is not allowed to detach. |
| if (dragging_panel_->IsMinimized()) |
| return; |
| |
| // Panels in the detached collection are always at their full size. |
| gfx::Rect target_bounds(target_position, dragging_panel_->full_size()); |
| |
| // To become detached, the panel should be dragged either out of the main |
| // work area or up high enough to pass certain threshold. |
| gfx::Rect target_work_area = panel_manager_->display_settings_provider()-> |
| GetWorkAreaMatching(target_bounds); |
| gfx::Rect dock_work_area = panel_manager_->docked_collection()->work_area(); |
| if (target_work_area.Contains(dock_work_area) && |
| dock_work_area.bottom() - target_bounds.bottom() < |
| kDetachDockedPanelThreshold) { |
| return; |
| } |
| |
| // Apply new panel bounds. |
| dragging_panel_->SetPanelBoundsInstantly(target_bounds); |
| |
| // Move the panel to new collection. |
| panel_manager_->MovePanelToCollection(dragging_panel_, |
| panel_manager_->detached_collection(), |
| PanelCollection::KNOWN_POSITION); |
| } |
| |
| void PanelDragController::TryDock(const gfx::Point& target_position) { |
| // It has to come from the detached collection. |
| if (dragging_panel_->collection()->type() != PanelCollection::DETACHED) |
| return; |
| |
| gfx::Rect target_bounds(target_position, dragging_panel_->GetBounds().size()); |
| |
| // To become docked, the panel should fall within the main work area and |
| // its bottom should come very close to or fall below the bottom of the main |
| // work area. |
| gfx::Rect target_work_area = panel_manager_->display_settings_provider()-> |
| GetWorkAreaMatching(target_bounds); |
| gfx::Rect dock_work_area = panel_manager_->docked_collection()->work_area(); |
| if (!target_work_area.Contains(dock_work_area) || |
| dock_work_area.bottom() - target_bounds.bottom() > |
| kDockDetachedPanelThreshold) { |
| return; |
| } |
| |
| // Apply new panel bounds. |
| dragging_panel_->SetPanelBoundsInstantly(target_bounds); |
| |
| // Move the panel to new collection. |
| panel_manager_->MovePanelToCollection(dragging_panel_, |
| panel_manager_->docked_collection(), |
| PanelCollection::KNOWN_POSITION); |
| } |
| |
| void PanelDragController::TryStack(const gfx::Point& target_position) { |
| gfx::Rect target_bounds; |
| GlueEdge target_edge; |
| Panel* target_panel = FindPanelToGlue(target_position, |
| STACK, |
| &target_bounds, |
| &target_edge); |
| if (!target_panel) |
| return; |
| |
| StackedPanelCollection* dragging_stack = dragging_panel_->stack(); |
| |
| // Move the panel (and all the panels below if in a stack) to the new |
| // position. |
| gfx::Vector2d delta = |
| target_bounds.origin() - dragging_panel_->GetBounds().origin(); |
| if (dragging_stack) |
| dragging_stack->MoveAllDraggingPanelsInstantly(delta); |
| else |
| dragging_panel_->MoveByInstantly(delta); |
| |
| // If the panel to stack with is not in a stack, create it now. |
| StackedPanelCollection* target_stack = target_panel->stack(); |
| if (!target_stack) { |
| target_stack = panel_manager_->CreateStack(); |
| panel_manager_->MovePanelToCollection(target_panel, |
| target_stack, |
| PanelCollection::DEFAULT_POSITION); |
| } |
| |
| // Move the panel to new collection. |
| // Note that we don't want to refresh the layout now because when we add |
| // a panel to top of other panel, we don't want the bottom panel to change |
| // its width to be same as top panel now. |
| PanelCollection::PositioningMask positioning_mask = |
| static_cast<PanelCollection::PositioningMask>( |
| PanelCollection::NO_LAYOUT_REFRESH | |
| (target_edge == TOP_EDGE ? PanelCollection::TOP_POSITION |
| : PanelCollection::DEFAULT_POSITION)); |
| MovePanelAndBelowToCollection(dragging_panel_, |
| target_stack, |
| positioning_mask); |
| } |
| |
| // Check if a panel or a set of stacked panels (being dragged together from a |
| // stack) can be dragged away from the panel below such that the former panel(s) |
| // are not in the same stack as the latter panel. |
| bool PanelDragController::TryUnstackFromTop(const gfx::Point& target_position) { |
| // It has to be stacked. |
| StackedPanelCollection* dragging_stack = dragging_panel_->stack(); |
| if (!dragging_stack) |
| return false; |
| |
| // Unstacking from top only happens when a panel/stack stacks to the top of |
| // another panel and then moves away while the drag is still in progress. |
| if (dragging_panel_ != dragging_stack->top_panel() || |
| dragging_stack == dragging_panel_original_collection_) |
| return false; |
| |
| // Count the number of panels that might need to unstack. |
| Panel* last_panel_to_unstack = NULL; |
| Panel* panel_below_last_panel_to_unstack = NULL; |
| int num_panels_to_unstack = 0; |
| for (StackedPanelCollection::Panels::const_iterator iter = |
| dragging_stack->panels().begin(); |
| iter != dragging_stack->panels().end(); ++iter) { |
| if (!(*iter)->in_preview_mode()) { |
| panel_below_last_panel_to_unstack = *iter; |
| break; |
| } |
| num_panels_to_unstack++; |
| last_panel_to_unstack = *iter; |
| } |
| DCHECK_GE(num_panels_to_unstack, 1); |
| if (num_panels_to_unstack == dragging_stack->num_panels()) |
| return false; |
| |
| gfx::Vector2d delta = target_position - dragging_panel_->GetBounds().origin(); |
| |
| // The last panel to unstack should be dragged far enough from its below |
| // panel. |
| gfx::Rect target_bounds = last_panel_to_unstack->GetBounds(); |
| target_bounds.Offset(delta); |
| gfx::Rect below_panel_bounds = panel_below_last_panel_to_unstack->GetBounds(); |
| if (GetVerticalDistance(target_bounds, below_panel_bounds) < |
| kGluePanelsDistanceThreshold && |
| GetHorizontalOverlap(target_bounds, below_panel_bounds) > |
| kGluePanelsOverlapThreshold) { |
| return false; |
| } |
| |
| int num_panels_in_stack = dragging_stack->num_panels(); |
| DCHECK_GE(num_panels_in_stack, 2); |
| |
| // When a panel is removed from its stack, we always make it detached. If it |
| // indeed should go to the docked collection, the subsequent TryDock will then |
| // move it from the detached collection to the docked collection. |
| DetachedPanelCollection* detached_collection = |
| panel_manager_->detached_collection(); |
| |
| // If there're only 2 panels in the stack, both panels should move out of the |
| // stack and the stack should be removed. |
| if (num_panels_in_stack == 2) { |
| DCHECK_EQ(1, num_panels_to_unstack); |
| MovePanelAndBelowToCollection(dragging_panel_, |
| detached_collection, |
| PanelCollection::KNOWN_POSITION); |
| dragging_panel_->MoveByInstantly(delta); |
| return true; |
| } |
| |
| DCHECK_GE(num_panels_in_stack, 3); |
| |
| // If only one panel (top panel) needs to unstack, move it out of the stack. |
| if (num_panels_to_unstack == 1) { |
| panel_manager_->MovePanelToCollection(dragging_panel_, |
| detached_collection, |
| PanelCollection::KNOWN_POSITION); |
| dragging_panel_->MoveByInstantly(delta); |
| return true; |
| } |
| |
| // If all the panels except the bottom panel need to unstack, simply move |
| // bottom panel out of the stack. |
| if (num_panels_in_stack - num_panels_to_unstack == 1) { |
| panel_manager_->MovePanelToCollection(dragging_stack->bottom_panel(), |
| detached_collection, |
| PanelCollection::KNOWN_POSITION); |
| dragging_panel_->stack()->MoveAllDraggingPanelsInstantly(delta); |
| return true; |
| } |
| |
| // Otherwise, move all unstacked panels to a new stack. |
| // Note that all the panels to move should be copied to a local list first |
| // because the stack collection will be modified during the move. |
| std::list<Panel*> panels_to_move; |
| for (StackedPanelCollection::Panels::const_iterator iter = |
| dragging_stack->panels().begin(); |
| iter != dragging_stack->panels().end(); ++iter) { |
| Panel* panel = *iter; |
| if (!panel->in_preview_mode()) |
| break; |
| panels_to_move.push_back(panel); |
| } |
| StackedPanelCollection* new_stack = panel_manager_->CreateStack(); |
| for (std::list<Panel*>::const_iterator iter = panels_to_move.begin(); |
| iter != panels_to_move.end(); ++iter) { |
| panel_manager_->MovePanelToCollection(*iter, |
| new_stack, |
| PanelCollection::KNOWN_POSITION); |
| } |
| dragging_panel_->stack()->MoveAllDraggingPanelsInstantly(delta); |
| |
| return true; |
| } |
| |
| // Check if a panel or a set of stacked panels (being dragged together from a |
| // stack) can be dragged away from the panel above such that the former panel(s) |
| // are not in the same stack as the latter panel. |
| bool PanelDragController::TryUnstackFromBottom( |
| const gfx::Point& target_position) { |
| // It has to be stacked. |
| StackedPanelCollection* dragging_stack = dragging_panel_->stack(); |
| if (!dragging_stack) |
| return false; |
| |
| // It cannot be the top panel. |
| if (dragging_panel_ == dragging_stack->top_panel()) |
| return false; |
| |
| DCHECK_GT(dragging_stack->num_panels(), 1); |
| |
| gfx::Rect target_bounds(target_position, dragging_panel_->GetBounds().size()); |
| |
| // The panel should be dragged far enough from its above panel. |
| Panel* above_panel = dragging_stack->GetPanelAbove(dragging_panel_); |
| DCHECK(above_panel); |
| gfx::Rect above_panel_bounds = above_panel->GetBounds(); |
| if (GetVerticalDistance(above_panel_bounds, target_bounds) < |
| kGluePanelsDistanceThreshold && |
| GetHorizontalOverlap(above_panel_bounds, target_bounds) > |
| kGluePanelsOverlapThreshold) { |
| return false; |
| } |
| |
| gfx::Vector2d delta = target_position - dragging_panel_->GetBounds().origin(); |
| |
| // If there're only 2 panels in the stack, both panels should move out the |
| // stack and the stack should be removed. |
| DetachedPanelCollection* detached_collection = |
| panel_manager_->detached_collection(); |
| if (dragging_stack->num_panels() == 2) { |
| MovePanelAndBelowToCollection(dragging_stack->top_panel(), |
| detached_collection, |
| PanelCollection::KNOWN_POSITION); |
| dragging_panel_->MoveByInstantly(delta); |
| return true; |
| } |
| |
| // There're at least 3 panels. |
| DCHECK_GE(dragging_stack->num_panels(), 3); |
| |
| // If the dragging panel is bottom panel, move it out of the stack. |
| if (dragging_panel_ == dragging_stack->bottom_panel()) { |
| panel_manager_->MovePanelToCollection(dragging_panel_, |
| detached_collection, |
| PanelCollection::KNOWN_POSITION); |
| dragging_panel_->MoveByInstantly(delta); |
| return true; |
| } |
| |
| // If the dragging panel is the one below the top panel, move top panel |
| // out of the stack. |
| if (dragging_stack->GetPanelAbove(dragging_panel_) == |
| dragging_stack->top_panel()) { |
| panel_manager_->MovePanelToCollection(dragging_stack->top_panel(), |
| detached_collection, |
| PanelCollection::KNOWN_POSITION); |
| dragging_panel_->stack()->MoveAllDraggingPanelsInstantly(delta); |
| return true; |
| } |
| |
| // There're at least 4 panels. |
| DCHECK_GE(dragging_stack->num_panels(), 4); |
| |
| // We can split them into 2 stacks by moving the dragging panel and all panels |
| // below to a new stack while keeping all panels above in the same stack. |
| StackedPanelCollection* new_stack = panel_manager_->CreateStack(); |
| MovePanelAndBelowToCollection(dragging_panel_, |
| new_stack, |
| PanelCollection::KNOWN_POSITION); |
| dragging_panel_->stack()->MoveAllDraggingPanelsInstantly(delta); |
| |
| return true; |
| } |
| |
| void PanelDragController::TrySnap(gfx::Point* target_position) { |
| // Snapping does not apply to docked panels. |
| if (dragging_panel_->collection()->type() == PanelCollection::DOCKED) |
| return; |
| |
| // Check if the panel can snap to other panel. |
| gfx::Rect target_bounds; |
| GlueEdge target_edge; |
| Panel* target_panel = FindPanelToGlue(*target_position, |
| SNAP, |
| &target_bounds, |
| &target_edge); |
| if (target_panel) { |
| *target_position = target_bounds.origin(); |
| return; |
| } |
| |
| // Check if the panel can snap to the left/right edge of the work area. |
| target_bounds.set_origin(*target_position); |
| target_bounds.set_size(dragging_panel_->GetBounds().size()); |
| gfx::Rect work_area = panel_manager_->display_settings_provider()-> |
| GetWorkAreaMatching(target_bounds); |
| if (abs(target_position->x() - work_area.x()) < |
| kSnapPanelToScreenEdgeThreshold) { |
| target_position->set_x(work_area.x()); |
| } else { |
| int width = dragging_panel_->GetBounds().width(); |
| if (abs(work_area.right() - target_position->x() - width) < |
| kSnapPanelToScreenEdgeThreshold) |
| target_position->set_x(work_area.right() - width); |
| } |
| |
| // Check if the panel can snap to the top/bottom edge of the work area. |
| if (abs(target_position->y() - work_area.y()) < |
| kSnapPanelToScreenEdgeThreshold) { |
| target_position->set_y(work_area.y()); |
| } else { |
| // If the panel is in a stack, the height is from the top edge of this panel |
| // to the bottom edge of the last panel in the stack. |
| int height; |
| StackedPanelCollection* stack = dragging_panel_->stack(); |
| if (stack) { |
| height = stack->bottom_panel()->GetBounds().bottom() - |
| dragging_panel_->GetBounds().y(); |
| } else { |
| height = dragging_panel_->GetBounds().height(); |
| } |
| if (abs(work_area.bottom() - target_position->y() - height) < |
| kSnapPanelToScreenEdgeThreshold) |
| target_position->set_y(work_area.bottom() - height); |
| } |
| } |
| |
| Panel* PanelDragController::FindPanelToGlue( |
| const gfx::Point& potential_position, |
| GlueAction action, |
| gfx::Rect* target_bounds, |
| GlueEdge* target_edge) const { |
| int best_distance = kint32max; |
| Panel* best_matching_panel = NULL; |
| |
| // Compute the potential bounds for the dragging panel. |
| gfx::Rect current_dragging_bounds = dragging_panel_->GetBounds(); |
| gfx::Rect potential_dragging_bounds(potential_position, |
| current_dragging_bounds.size()); |
| |
| // Compute the potential bounds for the bottom panel if the dragging panel is |
| // in a stack. If not, it is same as |potential_dragging_bounds|. |
| // This is used to determine if the dragging panel or the bottom panel can |
| // stack to the top of other panel. |
| gfx::Rect current_bottom_bounds; |
| gfx::Rect potential_bottom_bounds; |
| StackedPanelCollection* dragging_stack = dragging_panel_->stack(); |
| if (dragging_stack && dragging_panel_ != dragging_stack->bottom_panel()) { |
| gfx::Vector2d delta = potential_position - current_dragging_bounds.origin(); |
| current_bottom_bounds = dragging_stack->bottom_panel()->GetBounds(); |
| potential_bottom_bounds = current_bottom_bounds; |
| potential_bottom_bounds.Offset(delta); |
| } else { |
| current_bottom_bounds = current_dragging_bounds; |
| potential_bottom_bounds = potential_dragging_bounds; |
| } |
| |
| // Go through all non-docked panels. |
| std::vector<Panel*> panels = panel_manager_->GetDetachedAndStackedPanels(); |
| for (std::vector<Panel*>::const_iterator iter = panels.begin(); |
| iter != panels.end(); ++iter) { |
| Panel* panel = *iter; |
| if (dragging_panel_ == panel) |
| continue; |
| if (dragging_panel_->collection()->type() == PanelCollection::STACKED && |
| dragging_panel_->collection() == panel->collection()) |
| continue; |
| gfx::Rect panel_bounds = panel->GetBounds(); |
| int distance; |
| int overlap; |
| |
| if (action == SNAP) { |
| overlap = GetVerticalOverlap(potential_dragging_bounds, panel_bounds); |
| if (overlap > kGluePanelsOverlapThreshold) { |
| // Can |dragging_panel_| snap to left edge of |panel|? |
| distance = GetHorizontalDistance(potential_dragging_bounds, |
| panel_bounds); |
| if (distance < kGluePanelsDistanceThreshold && |
| distance < best_distance) { |
| best_distance = distance; |
| best_matching_panel = panel; |
| *target_edge = LEFT_EDGE; |
| *target_bounds = potential_dragging_bounds; |
| target_bounds->set_x(panel_bounds.x() - target_bounds->width()); |
| } |
| |
| // Can |dragging_panel_| snap to right edge of |panel|? |
| distance = GetHorizontalDistance(panel_bounds, |
| potential_dragging_bounds); |
| if (distance < kGluePanelsDistanceThreshold && |
| distance < best_distance) { |
| best_distance = distance; |
| best_matching_panel = panel; |
| *target_edge = RIGHT_EDGE; |
| *target_bounds = potential_dragging_bounds; |
| target_bounds->set_x(panel_bounds.right()); |
| } |
| } |
| } else { |
| DCHECK_EQ(STACK, action); |
| StackedPanelCollection* stack = panel->stack(); |
| |
| // Can |dragging_panel_| or the bottom panel in |dragging_panel_|'s stack |
| // stack to top edge of |panel|? If |panel| is in a stack and not top |
| // panel, its top edge is interior edge and thus cannot be aligned with. |
| distance = GetVerticalDistance(potential_bottom_bounds, panel_bounds); |
| overlap = GetHorizontalOverlap(panel_bounds, potential_bottom_bounds); |
| if ((!stack || panel == stack->top_panel()) && |
| distance < kGluePanelsDistanceThreshold && |
| overlap > kGluePanelsOverlapThreshold && |
| distance < best_distance) { |
| best_distance = distance; |
| best_matching_panel = panel; |
| *target_edge = TOP_EDGE; |
| target_bounds->SetRect( |
| potential_dragging_bounds.x(), |
| current_dragging_bounds.y() + panel_bounds.y() - |
| current_bottom_bounds.height() - current_bottom_bounds.y(), |
| potential_dragging_bounds.width(), |
| potential_dragging_bounds.height()); |
| } |
| |
| // Can |dragging_panel_| stack to bottom edge of |panel|? If |panel| is |
| // in a stack and not bottom panel, its bottom edge is interior edge and |
| // thus cannot be aligned with. |
| distance = GetVerticalDistance(panel_bounds, potential_dragging_bounds); |
| overlap = GetHorizontalOverlap(panel_bounds, potential_dragging_bounds); |
| if ((!stack || panel == stack->bottom_panel()) && |
| distance < kGluePanelsDistanceThreshold && |
| overlap > kGluePanelsOverlapThreshold && |
| distance < best_distance) { |
| best_distance = distance; |
| best_matching_panel = panel; |
| *target_edge = BOTTOM_EDGE; |
| target_bounds->SetRect(potential_dragging_bounds.x(), |
| panel_bounds.bottom(), |
| potential_dragging_bounds.width(), |
| potential_dragging_bounds.height()); |
| } |
| } |
| } |
| |
| return best_matching_panel; |
| } |
| |
| void PanelDragController::MovePanelAndBelowToCollection( |
| Panel* panel, |
| PanelCollection* target_collection, |
| PanelCollection::PositioningMask positioning_mask) const { |
| StackedPanelCollection* stack = panel->stack(); |
| if (!stack) { |
| panel_manager_->MovePanelToCollection(panel, |
| target_collection, |
| positioning_mask); |
| return; |
| } |
| |
| // Note that all the panels to move should be copied to a local list first |
| // because the stack collection will be modified during the move. |
| std::list<Panel*> panels_to_move; |
| StackedPanelCollection::Panels::const_iterator iter = stack->panels().begin(); |
| for (; iter != stack->panels().end(); ++iter) |
| if ((*iter) == panel) |
| break; |
| for (; iter != stack->panels().end(); ++iter) { |
| // Note that if the panels are going to be inserted from the top, we need |
| // to reverse the order when copying to the local list. |
| if (positioning_mask & PanelCollection::TOP_POSITION) |
| panels_to_move.push_front(*iter); |
| else |
| panels_to_move.push_back(*iter); |
| } |
| for (std::list<Panel*>::const_iterator panel_iter = panels_to_move.begin(); |
| panel_iter != panels_to_move.end(); ++panel_iter) { |
| panel_manager_->MovePanelToCollection(*panel_iter, |
| target_collection, |
| positioning_mask); |
| } |
| |
| // If the stack becomes empty or has only one panel left, no need to keep |
| // the stack. |
| if (stack && stack->num_panels() <= 1) { |
| if (stack->num_panels() == 1) { |
| panel_manager_->MovePanelToCollection( |
| stack->top_panel(), |
| panel_manager_->detached_collection(), |
| PanelCollection::KNOWN_POSITION); |
| } |
| // Note that if the stack is the original collection, do not remove it now. |
| // This is because the original collection contains the information to |
| // restore the dragging panel to the right place when the drag is cancelled. |
| if (stack != dragging_panel_original_collection_) |
| panel_manager_->RemoveStack(stack); |
| } |
| } |
