1 /*

     2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 #ifndef ScrollbarClient_h

    27 #define ScrollbarClient_h

    28 

    29 #include "IntRect.h"

    30 #include "Scrollbar.h"

    31 #include <wtf/Vector.h>

    32 

    33 namespace WebCore {

    34 

    35 class ScrollbarClient {

    36 public:

    37     virtual ~ScrollbarClient() {}

    38     virtual void valueChanged(Scrollbar*) = 0;

    39 

    40     virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&) = 0;

    41 

    42     virtual bool isActive() const = 0;

    43     

    44     virtual bool scrollbarCornerPresent() const = 0;

    45 

    46     virtual void getTickmarks(Vector<IntRect>&) const { }

    47 

    48     // Convert points and rects between the scrollbar and its containing view.

    49     // The client needs to implement these in order to be aware of layout effects

    50     // like CSS transforms.

    51     virtual IntRect convertFromScrollbarToContainingView(const Scrollbar* scrollbar, const IntRect& scrollbarRect) const

    52     {

    53         return scrollbar->Widget::convertToContainingView(scrollbarRect);

    54     }

    55     

    56     virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntRect& parentRect) const

    57     {

    58         return scrollbar->Widget::convertFromContainingView(parentRect);

    59     }

    60     

    61     virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar* scrollbar, const IntPoint& scrollbarPoint) const

    62     {

    63         return scrollbar->Widget::convertToContainingView(scrollbarPoint);

    64     }

    65     

    66     virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntPoint& parentPoint) const

    67     {

    68         return scrollbar->Widget::convertFromContainingView(parentPoint);

    69     }

    70 };

    71 

    72 }

    73 #endif