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// 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/geometry/point.h"
#include "ui/gfx/geometry/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);
}
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