/*
 * Copyright 2006, Haiku.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Ingo Weinhold <bonefish@cs.tu-berlin.de>
 */

#include "ScrollableView.h"

#include <View.h>

// constructor
ScrollableView::ScrollableView()
        : Scrollable()
{
}

// destructor
ScrollableView::~ScrollableView()
{
}

// ScrollOffsetChanged
void
ScrollableView::ScrollOffsetChanged(BPoint oldOffset, BPoint newOffset)
{
        if (BView* view = dynamic_cast<BView*>(this)) {
                // We keep it simple: The part of the data rect we shall show now
                // has existed before as well (even if partially or completely
                // obscured), so we let CopyBits() do the messy details.
                BRect bounds(view->Bounds());
                view->CopyBits(bounds.OffsetByCopy(newOffset - oldOffset), bounds);
                // move our children
                for (int32 i = 0; BView* child = view->ChildAt(i); i++)
                        child->MoveTo(child->Frame().LeftTop() + oldOffset - newOffset);
        }
}