| // 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/docked_panel_drag_handler.h" |
| |
| #include "chrome/browser/ui/panels/docked_panel_collection.h" |
| #include "chrome/browser/ui/panels/panel.h" |
| #include "chrome/browser/ui/panels/panel_manager.h" |
| #include "ui/gfx/point.h" |
| #include "ui/gfx/rect.h" |
| |
| // static |
| void DockedPanelDragHandler::HandleDrag(Panel* panel, |
| const gfx::Point& target_position) { |
| DCHECK_EQ(PanelCollection::DOCKED, panel->collection()->type()); |
| |
| DockedPanelCollection* collection = |
| static_cast<DockedPanelCollection*>(panel->collection()); |
| |
| // Moves this panel to the dragging position. |
| // Note that we still allow the panel to be moved vertically until it gets |
| // aligned to the bottom area. |
| gfx::Rect new_bounds(panel->GetBounds()); |
| new_bounds.set_x(target_position.x()); |
| int delta_x = new_bounds.x() - panel->GetBounds().x(); |
| int bottom = collection->GetBottomPositionForExpansionState( |
| panel->expansion_state()); |
| if (new_bounds.bottom() != bottom) { |
| new_bounds.set_y(target_position.y()); |
| if (new_bounds.bottom() > bottom) |
| new_bounds.set_y(bottom - new_bounds.height()); |
| } |
| panel->SetPanelBoundsInstantly(new_bounds); |
| |
| if (delta_x) { |
| // Checks and processes other affected panels. |
| if (delta_x > 0) |
| DragRight(panel); |
| else |
| DragLeft(panel); |
| |
| // Layout refresh will automatically recompute the bounds of all affected |
| // panels due to their position changes. |
| collection->RefreshLayout(); |
| } |
| } |
| |
| // static |
| void DockedPanelDragHandler::DragLeft(Panel* panel) { |
| DockedPanelCollection* collection = |
| static_cast<DockedPanelCollection*>(panel->collection()); |
| |
| // This is the left corner of the dragging panel. We use it to check against |
| // all the panels on its left. |
| int dragging_panel_left_boundary = panel->GetBounds().x(); |
| |
| // Checks the panels to the left of the dragging panel. |
| DockedPanelCollection::Panels::iterator dragging_panel_iterator = |
| find(collection->panels_.begin(), collection->panels_.end(), panel); |
| DockedPanelCollection::Panels::iterator current_panel_iterator = |
| dragging_panel_iterator; |
| ++current_panel_iterator; |
| for (; current_panel_iterator != collection->panels_.end(); |
| ++current_panel_iterator) { |
| Panel* current_panel = *current_panel_iterator; |
| |
| // Can we swap dragging panel with its left panel? The criterion is that |
| // the left corner of dragging panel should pass the middle position of |
| // its left panel. |
| if (dragging_panel_left_boundary > current_panel->GetBounds().x() + |
| current_panel->GetBounds().width() / 2) |
| break; |
| |
| // Swaps the contents and makes |dragging_panel_iterator| refers to the new |
| // position. |
| *dragging_panel_iterator = current_panel; |
| *current_panel_iterator = panel; |
| dragging_panel_iterator = current_panel_iterator; |
| } |
| } |
| |
| // static |
| void DockedPanelDragHandler::DragRight(Panel* panel) { |
| DockedPanelCollection* collection = |
| static_cast<DockedPanelCollection*>(panel->collection()); |
| |
| // This is the right corner of the dragging panel. We use it to check against |
| // all the panels on its right. |
| int dragging_panel_right_boundary = panel->GetBounds().x() + |
| panel->GetBounds().width() - 1; |
| |
| // Checks the panels to the right of the dragging panel. |
| DockedPanelCollection::Panels::iterator dragging_panel_iterator = |
| find(collection->panels_.begin(), collection->panels_.end(), panel); |
| DockedPanelCollection::Panels::iterator current_panel_iterator = |
| dragging_panel_iterator; |
| while (current_panel_iterator != collection->panels_.begin()) { |
| current_panel_iterator--; |
| Panel* current_panel = *current_panel_iterator; |
| |
| // Can we swap dragging panel with its right panel? The criterion is that |
| // the left corner of dragging panel should pass the middle position of |
| // its right panel. |
| if (dragging_panel_right_boundary < current_panel->GetBounds().x() + |
| current_panel->GetBounds().width() / 2) |
| break; |
| |
| // Swaps the contents and makes |dragging_panel_iterator| refers to the new |
| // position. |
| *dragging_panel_iterator = current_panel; |
| *current_panel_iterator = panel; |
| dragging_panel_iterator = current_panel_iterator; |
| } |
| } |