Source/core/accessibility/AXScrollView.h - Issue 713933002: Create Source/modules/accessibility/ and move most of core/accessibility/* into it

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Issue 713933002: Create Source/modules/accessibility/ and move most of core/accessibility/* into it (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master

Patch Set: Created 6 years, 1 month ago

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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 FrameView;

36

37 class AXScrollView final : public AXObject {

38 public:

39 static PassRefPtr<AXScrollView> create(FrameView*);

40 virtual AccessibilityRole roleValue() const override { return ScrollAreaRole ; }

41 FrameView* 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(FrameView*);

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* computeParent() const override;

71 virtual AXObject* computeParentIfExists() 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 // FIXME: Oilpan: Frame/ScrollView is on the heap and its

79 // AXScrollView is detached&removed from the AX cache when the

80 // FrameView is disposed. Which clears m_scrollView, hence this

81 // bare pointer will not be stale, so the bare pointer use is safe

82 // & acceptable.

83 //

84 // However, it would be preferable to have it be normally traced

85 // as part of moving the AX objects to the heap. Temporarily using

86 // a Persistent risks creating a FrameView leak, and brings no

87 // real benefits overall.

88 FrameView* m_scrollView;

89 RefPtr<AXObject> m_horizontalScrollbar;

90 RefPtr<AXObject> m_verticalScrollbar;

91 bool m_childrenDirty;

92 };

93

94 DEFINE_AX_OBJECT_TYPE_CASTS(AXScrollView, isAXScrollView());

95

96 } // namespace blink

97

98 #endif // AXScrollView_h

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