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      1 /*
      2  * Copyright (C) 2007 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 COMPUTER, 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 COMPUTER, 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 WebScrollBar_h
     27 #define WebScrollBar_h
     28 
     29 #include "WebKit.h"
     30 
     31 #include <wtf/RefPtr.h>
     32 #include <wtf/OwnPtr.h>
     33 
     34 #include <WebCore/COMPtr.h>
     35 #include <WebCore/Scrollbar.h>
     36 #include <WebCore/ScrollableArea.h>
     37 
     38 namespace WebCore {
     39 class Scrollbar;
     40 }
     41 
     42 class WebScrollBar : public IWebScrollBarPrivate, WebCore::ScrollableArea {
     43 public:
     44     static WebScrollBar* createInstance();
     45 protected:
     46     WebScrollBar();
     47     ~WebScrollBar();
     48 
     49 public:
     50     // IUnknown
     51     virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void** ppvObject);
     52     virtual ULONG STDMETHODCALLTYPE AddRef(void);
     53     virtual ULONG STDMETHODCALLTYPE Release(void);
     54 
     55     // IWebScrollBarPrivate
     56     virtual HRESULT STDMETHODCALLTYPE init(
     57         /* [in] */ IWebScrollBarDelegatePrivate* delegate,
     58         /* [in] */ OLE_HANDLE containingWindow,
     59         /* [in] */ WebScrollBarOrientation orientation,
     60         /* [in] */ WebScrollBarControlSize controlSize);
     61 
     62     virtual HRESULT STDMETHODCALLTYPE setEnabled(
     63         /* [in] */ BOOL enabled);
     64 
     65     virtual HRESULT STDMETHODCALLTYPE setSteps(
     66         /* [in] */ int lineStep,
     67         /* [in] */ int pageStep);
     68 
     69     virtual HRESULT STDMETHODCALLTYPE setProportion(
     70         /* [in] */ int visibleSize,
     71         /* [in] */ int totalSize);
     72 
     73     virtual HRESULT STDMETHODCALLTYPE setRect(
     74         /* [in] */ RECT bounds);
     75 
     76     virtual HRESULT STDMETHODCALLTYPE setValue(
     77         /* [in] */ int value);
     78 
     79     virtual HRESULT STDMETHODCALLTYPE value(
     80         /* [retval][out] */ int* value);
     81 
     82     virtual HRESULT STDMETHODCALLTYPE paint(
     83         /* [in] */ HDC dc,
     84         /* [in] */ RECT damageRect);
     85 
     86     virtual HRESULT STDMETHODCALLTYPE frameRect(
     87         /* [retval][out] */ RECT* bounds);
     88 
     89     virtual HRESULT STDMETHODCALLTYPE width(
     90         /* [retval][out] */ int* w);
     91 
     92     virtual HRESULT STDMETHODCALLTYPE height(
     93         /* [retval][out] */ int* h);
     94 
     95     virtual HRESULT STDMETHODCALLTYPE requestedWidth(
     96         /* [retval][out] */ int* w);
     97 
     98     virtual HRESULT STDMETHODCALLTYPE requestedHeight(
     99         /* [retval][out] */ int* h);
    100 
    101     virtual HRESULT STDMETHODCALLTYPE handleMouseEvent(
    102         /* [in] */ OLE_HANDLE window,
    103         /* [in] */ UINT msg,
    104         /* [in] */ WPARAM wParam,
    105         /* [in] */ LPARAM lParam);
    106 
    107     virtual HRESULT STDMETHODCALLTYPE scroll(
    108         /* [in] */ WebScrollDirection direction,
    109         /* [in] */ WebScrollGranularity granularity,
    110         /* [in] */ float multiplier);
    111 
    112 protected:
    113     // ScrollableArea
    114     virtual int scrollSize(WebCore::ScrollbarOrientation) const;
    115     virtual int scrollPosition(WebCore::Scrollbar*) const;
    116     virtual void setScrollOffset(const WebCore::IntPoint&);
    117     virtual void invalidateScrollbarRect(WebCore::Scrollbar*, const WebCore::IntRect&);
    118     virtual void invalidateScrollCornerRect(const WebCore::IntRect&) { }
    119 
    120     // FIXME: We should provide a way to set this value.
    121     virtual bool isActive() const { return true; }
    122 
    123     virtual bool isScrollCornerVisible() const { return false; }
    124     virtual WebCore::IntRect scrollCornerRect() const { return WebCore::IntRect(); }
    125 
    126     virtual WebCore::Scrollbar* horizontalScrollbar() const;
    127     virtual WebCore::Scrollbar* verticalScrollbar() const;
    128 
    129     ULONG m_refCount;
    130     HWND m_containingWindow;
    131     int m_currentPosition;
    132     RefPtr<WebCore::Scrollbar> m_scrollBar;
    133     COMPtr<IWebScrollBarDelegatePrivate> m_delegate;
    134 };
    135 
    136 #endif
    137