зеркало из https://github.com/mozilla/gecko-dev.git
456 строки
15 KiB
C++
456 строки
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_a11y_HyperTextAccessible_h__
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#define mozilla_a11y_HyperTextAccessible_h__
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#include "AccessibleWrap.h"
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#include "mozilla/a11y/HyperTextAccessibleBase.h"
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#include "nsIAccessibleText.h"
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#include "nsIAccessibleTypes.h"
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#include "nsIFrame.h" // only for nsSelectionAmount
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#include "nsISelectionController.h"
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#include "nsDirection.h"
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#include "WordMovementType.h"
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class nsFrameSelection;
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class nsIFrame;
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class nsRange;
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class nsIWidget;
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namespace mozilla {
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class EditorBase;
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namespace dom {
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class Selection;
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}
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namespace a11y {
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class TextLeafPoint;
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class TextRange;
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struct DOMPoint {
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DOMPoint() : node(nullptr), idx(0) {}
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DOMPoint(nsINode* aNode, int32_t aIdx) : node(aNode), idx(aIdx) {}
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nsINode* node;
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int32_t idx;
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};
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/**
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* Special Accessible that knows how contain both text and embedded objects
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*/
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class HyperTextAccessible : public AccessibleWrap,
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public HyperTextAccessibleBase {
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public:
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HyperTextAccessible(nsIContent* aContent, DocAccessible* aDoc);
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NS_INLINE_DECL_REFCOUNTING_INHERITED(HyperTextAccessible, AccessibleWrap)
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// LocalAccessible
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virtual already_AddRefed<AccAttributes> NativeAttributes() override;
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virtual mozilla::a11y::role NativeRole() const override;
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virtual uint64_t NativeState() const override;
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virtual void Shutdown() override;
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virtual bool RemoveChild(LocalAccessible* aAccessible) override;
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virtual bool InsertChildAt(uint32_t aIndex, LocalAccessible* aChild) override;
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virtual Relation RelationByType(RelationType aType) const override;
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// HyperTextAccessible (static helper method)
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// Convert content offset to rendered text offset
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nsresult ContentToRenderedOffset(nsIFrame* aFrame, int32_t aContentOffset,
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uint32_t* aRenderedOffset) const;
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// Convert rendered text offset to content offset
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nsresult RenderedToContentOffset(nsIFrame* aFrame, uint32_t aRenderedOffset,
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int32_t* aContentOffset) const;
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//////////////////////////////////////////////////////////////////////////////
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// HyperLinkAccessible
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/**
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* Return link accessible at the given index.
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*/
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LocalAccessible* LinkAt(uint32_t aIndex) { return EmbeddedChildAt(aIndex); }
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//////////////////////////////////////////////////////////////////////////////
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// HyperTextAccessible: DOM point to text offset conversions.
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/**
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* Turn a DOM point (node and offset) into a character offset of this
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* hypertext. Will look for closest match when the DOM node does not have
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* an accessible object associated with it. Will return an offset for the end
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* of the string if the node is not found.
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*
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* @param aNode [in] the node to look for
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* @param aNodeOffset [in] the offset to look for
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* if -1 just look directly for the node
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* if >=0 and aNode is text, this represents a char
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* offset if >=0 and aNode is not text, this represents a child node offset
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* @param aIsEndOffset [in] if true, then this offset is not inclusive. The
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* character indicated by the offset returned is at [offset - 1]. This means
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* if the passed-in offset is really in a descendant, then the offset
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* returned will come just after the relevant embedded object characer. If
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* false, then the offset is inclusive. The character indicated by the offset
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* returned is at [offset]. If the passed-in offset in inside a descendant,
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* then the returned offset will be on the relevant embedded object char.
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*/
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uint32_t DOMPointToOffset(nsINode* aNode, int32_t aNodeOffset,
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bool aIsEndOffset = false) const;
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/**
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* Transform the given a11y point into the offset relative this hypertext.
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*/
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uint32_t TransformOffset(LocalAccessible* aDescendant, uint32_t aOffset,
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bool aIsEndOffset) const;
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/**
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* Convert the given offset into DOM point.
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*
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* If offset is at text leaf then DOM point is (text node, offsetInTextNode),
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* if before embedded object then (parent node, indexInParent), if after then
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* (parent node, indexInParent + 1).
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*/
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DOMPoint OffsetToDOMPoint(int32_t aOffset) const;
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//////////////////////////////////////////////////////////////////////////////
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// TextAccessible
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using HyperTextAccessibleBase::CharAt;
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char16_t CharAt(int32_t aOffset) {
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nsAutoString charAtOffset;
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CharAt(aOffset, charAtOffset);
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return charAtOffset.CharAt(0);
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}
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/**
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* Return true if char at the given offset equals to given char.
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*/
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bool IsCharAt(int32_t aOffset, char16_t aChar) {
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return CharAt(aOffset) == aChar;
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}
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/**
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* Return true if terminal char is at the given offset.
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*/
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bool IsLineEndCharAt(int32_t aOffset) { return IsCharAt(aOffset, '\n'); }
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virtual void TextBeforeOffset(int32_t aOffset,
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AccessibleTextBoundary aBoundaryType,
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int32_t* aStartOffset, int32_t* aEndOffset,
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nsAString& aText) override;
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virtual void TextAtOffset(int32_t aOffset,
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AccessibleTextBoundary aBoundaryType,
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int32_t* aStartOffset, int32_t* aEndOffset,
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nsAString& aText) override;
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virtual void TextAfterOffset(int32_t aOffset,
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AccessibleTextBoundary aBoundaryType,
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int32_t* aStartOffset, int32_t* aEndOffset,
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nsAString& aText) override;
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virtual already_AddRefed<AccAttributes> TextAttributes(
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bool aIncludeDefAttrs, int32_t aOffset, int32_t* aStartOffset,
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int32_t* aEndOffset) override;
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virtual already_AddRefed<AccAttributes> DefaultTextAttributes() override;
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virtual void InvalidateCachedHyperTextOffsets() override { mOffsets.Clear(); }
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// HyperTextAccessibleBase provides an overload which takes an Accessible.
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using HyperTextAccessibleBase::GetChildOffset;
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virtual LocalAccessible* GetChildAtOffset(uint32_t aOffset) const override {
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return LocalChildAt(GetChildIndexAtOffset(aOffset));
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}
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/**
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* Return an offset at the given point.
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*/
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int32_t OffsetAtPoint(int32_t aX, int32_t aY, uint32_t aCoordType) override;
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LayoutDeviceIntRect TextBounds(
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int32_t aStartOffset, int32_t aEndOffset,
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uint32_t aCoordType =
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nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE) override;
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LayoutDeviceIntRect CharBounds(int32_t aOffset,
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uint32_t aCoordType) override {
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int32_t endOffset = aOffset == static_cast<int32_t>(CharacterCount())
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? aOffset
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: aOffset + 1;
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return TextBounds(aOffset, endOffset, aCoordType);
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}
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/**
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* Get/set caret offset, if no caret then -1.
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*/
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virtual int32_t CaretOffset() const override;
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virtual void SetCaretOffset(int32_t aOffset) override;
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/**
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* Provide the line number for the caret.
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* @return 1-based index for the line number with the caret
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*/
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int32_t CaretLineNumber();
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/**
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* Return the caret rect and the widget containing the caret within this
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* text accessible.
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*
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* @param [out] the widget containing the caret
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* @return the caret rect
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*/
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mozilla::LayoutDeviceIntRect GetCaretRect(nsIWidget** aWidget);
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/**
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* Return true if caret is at end of line.
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*/
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bool IsCaretAtEndOfLine() const;
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virtual int32_t SelectionCount() override;
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virtual bool SelectionBoundsAt(int32_t aSelectionNum, int32_t* aStartOffset,
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int32_t* aEndOffset) override;
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/*
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* Changes the start and end offset of the specified selection.
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* @return true if succeeded
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*/
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// TODO: annotate this with `MOZ_CAN_RUN_SCRIPT` instead.
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MOZ_CAN_RUN_SCRIPT_BOUNDARY bool SetSelectionBoundsAt(int32_t aSelectionNum,
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int32_t aStartOffset,
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int32_t aEndOffset);
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/**
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* Adds a selection bounded by the specified offsets.
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* @return true if succeeded
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*/
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bool AddToSelection(int32_t aStartOffset, int32_t aEndOffset);
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/*
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* Removes the specified selection.
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* @return true if succeeded
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*/
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// TODO: annotate this with `MOZ_CAN_RUN_SCRIPT` instead.
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MOZ_CAN_RUN_SCRIPT_BOUNDARY bool RemoveFromSelection(int32_t aSelectionNum);
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/**
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* Scroll the given text range into view.
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*/
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void ScrollSubstringTo(int32_t aStartOffset, int32_t aEndOffset,
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uint32_t aScrollType);
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/**
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* Scroll the given text range to the given point.
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*/
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void ScrollSubstringToPoint(int32_t aStartOffset, int32_t aEndOffset,
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uint32_t aCoordinateType, int32_t aX, int32_t aY);
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/**
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* Return a range that encloses the text control or the document this
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* accessible belongs to.
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*/
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void EnclosingRange(TextRange& aRange) const;
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virtual void SelectionRanges(nsTArray<TextRange>* aRanges) const override;
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/**
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* Return an array of disjoint ranges of visible text within the text control
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* or the document this accessible belongs to.
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*/
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void VisibleRanges(nsTArray<TextRange>* aRanges) const;
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/**
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* Return a range containing the given accessible.
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*/
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void RangeByChild(LocalAccessible* aChild, TextRange& aRange) const;
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/**
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* Return a range containing an accessible at the given point.
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*/
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void RangeAtPoint(int32_t aX, int32_t aY, TextRange& aRange) const;
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//////////////////////////////////////////////////////////////////////////////
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// EditableTextAccessible
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MOZ_CAN_RUN_SCRIPT_BOUNDARY void ReplaceText(const nsAString& aText);
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MOZ_CAN_RUN_SCRIPT_BOUNDARY void InsertText(const nsAString& aText,
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int32_t aPosition);
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void CopyText(int32_t aStartPos, int32_t aEndPos);
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MOZ_CAN_RUN_SCRIPT_BOUNDARY void CutText(int32_t aStartPos, int32_t aEndPos);
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MOZ_CAN_RUN_SCRIPT_BOUNDARY void DeleteText(int32_t aStartPos,
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int32_t aEndPos);
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MOZ_CAN_RUN_SCRIPT
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void PasteText(int32_t aPosition);
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/**
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* Return the editor associated with the accessible.
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* The result may be either TextEditor or HTMLEditor.
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*/
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virtual already_AddRefed<EditorBase> GetEditor() const;
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/**
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* Return DOM selection object for the accessible.
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*/
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dom::Selection* DOMSelection() const;
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protected:
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virtual ~HyperTextAccessible() {}
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// LocalAccessible
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virtual ENameValueFlag NativeName(nsString& aName) const override;
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// HyperTextAccessible
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/**
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* Adjust an offset the caret stays at to get a text by line boundary.
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*/
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uint32_t AdjustCaretOffset(uint32_t aOffset) const;
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/**
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* Return true if the given offset points to terminal empty line if any.
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*/
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bool IsEmptyLastLineOffset(int32_t aOffset) {
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return aOffset == static_cast<int32_t>(CharacterCount()) &&
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IsLineEndCharAt(aOffset - 1);
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}
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/**
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* Return an offset of the found word boundary.
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*/
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uint32_t FindWordBoundary(uint32_t aOffset, nsDirection aDirection,
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EWordMovementType aWordMovementType);
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/**
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* Used to get begin/end of previous/this/next line. Note: end of line
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* is an offset right before '\n' character if any, the offset is right after
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* '\n' character is begin of line. In case of wrap word breaks these offsets
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* are equal.
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*/
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enum EWhichLineBoundary {
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ePrevLineBegin,
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ePrevLineEnd,
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eThisLineBegin,
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eThisLineEnd,
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eNextLineBegin,
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eNextLineEnd
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};
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/**
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* Return an offset for requested line boundary. See constants above.
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*/
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uint32_t FindLineBoundary(uint32_t aOffset,
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EWhichLineBoundary aWhichLineBoundary);
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/**
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* Find the start offset for a paragraph , taking into account
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* inner block elements and line breaks.
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*/
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int32_t FindParagraphStartOffset(uint32_t aOffset);
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/**
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* Find the end offset for a paragraph , taking into account
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* inner block elements and line breaks.
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*/
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int32_t FindParagraphEndOffset(uint32_t aOffset);
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/**
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* Return an offset corresponding to the given direction and selection amount
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* relative the given offset. A helper used to find word or line boundaries.
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*/
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uint32_t FindOffset(uint32_t aOffset, nsDirection aDirection,
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nsSelectionAmount aAmount,
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EWordMovementType aWordMovementType = eDefaultBehavior);
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/**
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* Return the boundaries (in dev pixels) of the substring in case of textual
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* frame or frame boundaries in case of non textual frame, offsets are
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* ignored.
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*/
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LayoutDeviceIntRect GetBoundsInFrame(nsIFrame* aFrame,
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uint32_t aStartRenderedOffset,
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uint32_t aEndRenderedOffset);
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// Selection helpers
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/**
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* Return frame selection object for the accessible.
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*/
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already_AddRefed<nsFrameSelection> FrameSelection() const;
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/**
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* Return selection ranges within the accessible subtree.
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*/
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void GetSelectionDOMRanges(SelectionType aSelectionType,
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nsTArray<nsRange*>* aRanges);
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// TODO: annotate this with `MOZ_CAN_RUN_SCRIPT` instead.
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MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult SetSelectionRange(int32_t aStartPos,
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int32_t aEndPos);
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// Helpers
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nsresult GetDOMPointByFrameOffset(nsIFrame* aFrame, int32_t aOffset,
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LocalAccessible* aAccessible,
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mozilla::a11y::DOMPoint* aPoint);
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/**
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* Set 'misspelled' text attribute and return range offsets where the
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* attibute is stretched. If the text is not misspelled at the given offset
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* then we expose only range offsets where text is not misspelled. The method
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* is used by TextAttributes() method.
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*
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* @param aIncludeDefAttrs [in] points whether text attributes having default
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* values of attributes should be included
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* @param aSourceNode [in] the node we start to traverse from
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* @param aStartOffset [in, out] the start offset
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* @param aEndOffset [in, out] the end offset
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* @param aAttributes [out, optional] result attributes
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*/
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void GetSpellTextAttr(nsINode* aNode, uint32_t aNodeOffset,
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uint32_t* aStartOffset, uint32_t* aEndOffset,
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AccAttributes* aAttributes);
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/**
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* Set xml-roles attributes for MathML elements.
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* @param aAttributes
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*/
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void SetMathMLXMLRoles(AccAttributes* aAttributes);
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// HyperTextAccessibleBase
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virtual const Accessible* Acc() const override { return this; }
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virtual const nsTArray<int32_t>& GetCachedHyperTextOffsets() const override {
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if (mOffsets.IsEmpty()) {
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BuildCachedHyperTextOffsets(mOffsets);
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}
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return mOffsets;
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}
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private:
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/**
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* End text offsets array.
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*/
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mutable nsTArray<int32_t> mOffsets;
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};
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////////////////////////////////////////////////////////////////////////////////
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// LocalAccessible downcasting method
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inline HyperTextAccessible* LocalAccessible::AsHyperText() {
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return IsHyperText() ? static_cast<HyperTextAccessible*>(this) : nullptr;
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}
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inline HyperTextAccessibleBase* LocalAccessible::AsHyperTextBase() {
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return AsHyperText();
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}
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} // namespace a11y
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} // namespace mozilla
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#endif
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