* Copyright (c) 1999-2000, Eric Moon.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions, and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __EMOON_ScrollHelpers_H__
#define __EMOON_ScrollHelpers_H__
#include <View.h>
#include "debug_tools.h"
class IScrollTarget {
public:
virtual void handleScrollBy(float xDelta, float yDelta)=0;
};
class ScrollProxyView : public BView {
typedef BView _inherited;
public:
ScrollProxyView(IScrollTarget* pTarget, BRect frame) :
m_pTarget(pTarget),
BView(frame, "scrollProxy", B_FOLLOW_LEFT|B_FOLLOW_TOP, 0) {}
virtual ~ScrollProxyView() {}
virtual void ScrollTo(BPoint where) {
float xDelta = where.x - Bounds().left;
float yDelta = where.y - Bounds().top;
_inherited::ScrollTo(where);
ASSERT(m_pTarget);
m_pTarget->handleScrollBy(xDelta, yDelta);
}
protected:
IScrollTarget* m_pTarget;
};
#endif
