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      1 /*
      2  * Copyright (C) 2011 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  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef AXScrollView_h
     27 #define AXScrollView_h
     28 
     29 #include "core/accessibility/AXObject.h"
     30 
     31 namespace blink {
     32 
     33 class AXScrollbar;
     34 class Scrollbar;
     35 class ScrollView;
     36 
     37 class AXScrollView FINAL : public AXObject {
     38 public:
     39     static PassRefPtr<AXScrollView> create(ScrollView*);
     40     virtual AccessibilityRole roleValue() const OVERRIDE { return ScrollAreaRole; }
     41     ScrollView* scrollView() const { return m_scrollView; }
     42 
     43     virtual ~AXScrollView();
     44     virtual void detach() OVERRIDE;
     45 
     46 protected:
     47     virtual ScrollableArea* getScrollableAreaIfScrollable() const OVERRIDE;
     48     virtual void scrollTo(const IntPoint&) const OVERRIDE;
     49 
     50 private:
     51     explicit AXScrollView(ScrollView*);
     52 
     53     virtual bool computeAccessibilityIsIgnored() const OVERRIDE;
     54     virtual bool isAXScrollView() const OVERRIDE { return true; }
     55     virtual bool isEnabled() const OVERRIDE { return true; }
     56 
     57     virtual bool isAttachment() const OVERRIDE;
     58     virtual Widget* widgetForAttachmentView() const OVERRIDE;
     59 
     60     virtual AXObject* scrollBar(AccessibilityOrientation) OVERRIDE;
     61     virtual void addChildren() OVERRIDE;
     62     virtual void clearChildren() OVERRIDE;
     63     virtual AXObject* accessibilityHitTest(const IntPoint&) const OVERRIDE;
     64     virtual void updateChildrenIfNecessary() OVERRIDE;
     65     virtual void setNeedsToUpdateChildren() OVERRIDE { m_childrenDirty = true; }
     66     void updateScrollbars();
     67 
     68     virtual FrameView* documentFrameView() const OVERRIDE;
     69     virtual LayoutRect elementRect() const OVERRIDE;
     70     virtual AXObject* parentObject() const OVERRIDE;
     71     virtual AXObject* parentObjectIfExists() const OVERRIDE;
     72 
     73     AXObject* webAreaObject() const;
     74     virtual AXObject* firstChild() const OVERRIDE { return webAreaObject(); }
     75     AXScrollbar* addChildScrollbar(Scrollbar*);
     76     void removeChildScrollbar(AXObject*);
     77 
     78     ScrollView* m_scrollView;
     79     RefPtr<AXObject> m_horizontalScrollbar;
     80     RefPtr<AXObject> m_verticalScrollbar;
     81     bool m_childrenDirty;
     82 };
     83 
     84 DEFINE_AX_OBJECT_TYPE_CASTS(AXScrollView, isAXScrollView());
     85 
     86 } // namespace blink
     87 
     88 #endif // AXScrollView_h
     89