accessible/xpcom/xpcAccessibleTextRange.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_a11y_xpcAccessibleTextRange_h_
   8 #define mozilla_a11y_xpcAccessibleTextRange_h_
   9
  10 #include <utility>
  11
  12 #include "TextRange.h"
  13 #include "nsIAccessibleTextRange.h"
  14 #include "xpcAccessibleHyperText.h"
  15
  16 namespace mozilla {
  17 namespace a11y {
  18
  19 class TextRange;
  20
  21 #define NS_ACCESSIBLETEXTRANGE_IMPL_IID              \
  22   { /* 133c8bf4-4913-4355-bd50-426bd1d6e1ad */       \
  23     0xb17652d9, 0x4f54, 0x4c56, {                    \
  24       0xbb, 0x62, 0x6d, 0x5b, 0xf1, 0xef, 0x91, 0x0c \
  25     }                                                \
  26   }
  27
  28 class xpcAccessibleTextRange final : public nsIAccessibleTextRange {
  29  public:
  30   explicit xpcAccessibleTextRange(TextRange& aRange) { SetRange(aRange); }
  31
  32   NS_DECL_ISUPPORTS
  33
  34   NS_IMETHOD GetStartContainer(nsIAccessibleText** aAnchor) final;
  35   NS_IMETHOD GetStartOffset(int32_t* aOffset) final;
  36   NS_IMETHOD GetEndContainer(nsIAccessibleText** aAnchor) final;
  37   NS_IMETHOD GetEndOffset(int32_t* aOffset) final;
  38   NS_IMETHOD GetContainer(nsIAccessible** aContainer) final;
  39   NS_IMETHOD Compare(nsIAccessibleTextRange* aOtherRange, bool* aResult) final;
  40   NS_IMETHOD CompareEndPoints(uint32_t aEndPoint,
  41                               nsIAccessibleTextRange* aOtherRange,
  42                               uint32_t aOtherRangeEndPoint,
  43                               int32_t* aResult) final;
  44   NS_IMETHOD Crop(nsIAccessible* aContainer, bool* aSuccess) final;
  45
  46   NS_DECLARE_STATIC_IID_ACCESSOR(NS_ACCESSIBLETEXTRANGE_IMPL_IID)
  47
  48  private:
  49   xpcAccessibleTextRange() {}
  50
  51   ~xpcAccessibleTextRange() {}
  52
  53   friend class xpcAccessibleHyperText;
  54
  55   xpcAccessibleTextRange& operator=(const xpcAccessibleTextRange&) = delete;
  56
  57   void SetRange(TextRange& aRange);
  58
  59   TextRange Range();
  60
  61   // We can't hold a strong reference to an Accessible, but XPCOM needs strong
  62   // references. Thus, instead of holding a TextRange here, we hold
  63   // xpcAccessibleHyperText references and create the TextRange for each call
  64   // using Range().
  65   RefPtr<xpcAccessibleHyperText> mRoot;
  66   RefPtr<xpcAccessibleHyperText> mStartContainer;
  67   int32_t mStartOffset;
  68   RefPtr<xpcAccessibleHyperText> mEndContainer;
  69   int32_t mEndOffset;
  70 };
  71
  72 NS_DEFINE_STATIC_IID_ACCESSOR(xpcAccessibleTextRange,
  73                               NS_ACCESSIBLETEXTRANGE_IMPL_IID)
  74
  75 }  // namespace a11y
  76 }  // namespace mozilla
  77
  78 #endif