| // 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/stacked_panel_drag_handler.h" |
| |
| #include "base/logging.h" |
| #include "chrome/browser/ui/panels/panel.h" |
| #include "chrome/browser/ui/panels/panel_collection.h" |
| #include "chrome/browser/ui/panels/stacked_panel_collection.h" |
| #include "ui/gfx/point.h" |
| #include "ui/gfx/rect.h" |
| |
| // static |
| void StackedPanelDragHandler::HandleDrag(Panel* panel, |
| const gfx::Point& target_position, |
| bool in_orginal_collection) { |
| DCHECK_EQ(PanelCollection::STACKED, panel->collection()->type()); |
| |
| StackedPanelCollection* stack = panel->stack(); |
| DCHECK(stack); |
| |
| // If the panel is in its original stack, only top panel is allowed to drag. |
| if (in_orginal_collection && panel != stack->top_panel()) |
| return; |
| |
| // Find out if all panels in the stack are being dragged. |
| bool all_panels_under_drag = true; |
| for (StackedPanelCollection::Panels::const_iterator iter = |
| stack->panels().begin(); |
| iter != stack->panels().end(); ++iter) { |
| if (!(*iter)->in_preview_mode()) { |
| all_panels_under_drag = false; |
| break; |
| } |
| } |
| |
| gfx::Vector2d delta_origin = target_position - panel->GetBounds().origin(); |
| |
| // If not all panels in the stack are being dragged, it means that these |
| // panels being dragged have just been added to this stack. Dragging these |
| // panels should only cause the horizontal movement due to that y position |
| // of these panels have already aligned. |
| if (!all_panels_under_drag) |
| delta_origin.set_y(0); |
| |
| stack->MoveAllDraggingPanelsInstantly(delta_origin); |
| } |
| |
| // static |
| void StackedPanelDragHandler::FinalizeDrag(Panel* panel) { |
| DCHECK_EQ(PanelCollection::STACKED, panel->collection()->type()); |
| |
| StackedPanelCollection* stack = panel->stack(); |
| DCHECK(stack); |
| |
| // It is only needed when dragging a panel/stack to stack to the top of |
| // another panel/stack. |
| if (stack->top_panel() != panel) |
| return; |
| |
| // Find the first non-dragging panel that is used to align all dragging panels |
| // above it to have the same x position. This is because all dragging panels |
| // are only aligned vertically when the stacking occurs. |
| Panel* first_non_dragging_panel = NULL; |
| for (StackedPanelCollection::Panels::const_iterator iter = |
| stack->panels().begin(); |
| iter != stack->panels().end(); ++iter) { |
| Panel* panel = *iter; |
| if (!panel->in_preview_mode()) { |
| first_non_dragging_panel = panel; |
| break; |
| } |
| } |
| if (!first_non_dragging_panel) |
| return; |
| |
| gfx::Vector2d delta_origin( |
| first_non_dragging_panel->GetBounds().x() - panel->GetBounds().x(), |
| 0); |
| stack->MoveAllDraggingPanelsInstantly(delta_origin); |
| } |