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Diffstat (limited to 'dom/base/Selection.h')
| -rw-r--r-- | dom/base/Selection.h | 1134 |
1 files changed, 1134 insertions, 0 deletions
diff --git a/dom/base/Selection.h b/dom/base/Selection.h new file mode 100644 index 0000000000..9f031ab3cf --- /dev/null +++ b/dom/base/Selection.h @@ -0,0 +1,1134 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_Selection_h__ +#define mozilla_Selection_h__ + +#include "mozilla/AutoRestore.h" +#include "mozilla/EventForwards.h" +#include "mozilla/PresShellForwards.h" +#include "mozilla/RangeBoundary.h" +#include "mozilla/SelectionChangeEventDispatcher.h" +#include "mozilla/UniquePtr.h" +#include "mozilla/WeakPtr.h" +#include "mozilla/dom/Highlight.h" +#include "mozilla/dom/StyledRange.h" +#include "nsDirection.h" +#include "nsISelectionController.h" +#include "nsISelectionListener.h" +#include "nsRange.h" +#include "nsTArrayForwardDeclare.h" +#include "nsThreadUtils.h" +#include "nsWeakReference.h" +#include "nsWrapperCache.h" + +struct CachedOffsetForFrame; +class AutoScroller; +class nsIFrame; +class nsFrameSelection; +class nsPIDOMWindowOuter; +struct SelectionDetails; +struct SelectionCustomColors; +class nsCopySupport; +class nsHTMLCopyEncoder; +class nsPresContext; +struct nsPoint; +struct nsRect; + +namespace mozilla { +class AccessibleCaretEventHub; +class ErrorResult; +class HTMLEditor; +class PostContentIterator; +enum class CaretAssociationHint; +enum class TableSelectionMode : uint32_t; +struct AutoPrepareFocusRange; +struct PrimaryFrameData; +namespace dom { +class DocGroup; +} // namespace dom +} // namespace mozilla + +namespace mozilla { + +namespace dom { + +// Note, the ownership of mozilla::dom::Selection depends on which way the +// object is created. When nsFrameSelection has created Selection, +// addreffing/releasing the Selection object is aggregated to nsFrameSelection. +// Otherwise normal addref/release is used. This ensures that nsFrameSelection +// is never deleted before its Selections. +class Selection final : public nsSupportsWeakReference, + public nsWrapperCache, + public SupportsWeakPtr { + protected: + virtual ~Selection(); + + public: + /** + * @param aFrameSelection can be nullptr. + */ + explicit Selection(SelectionType aSelectionType, + nsFrameSelection* aFrameSelection); + + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(Selection) + + /** + * Match this up with EndbatchChanges. will stop ui updates while multiple + * selection methods are called + * + * @param aDetails string to explian why this is called. This won't be + * stored nor exposed to selection listeners etc. Just for logging. + */ + void StartBatchChanges(const char* aDetails); + + /** + * Match this up with StartBatchChanges + * + * @param aDetails string to explian why this is called. This won't be + * stored nor exposed to selection listeners etc. Just for logging. + * @param aReasons potentially multiple of the reasons defined in + * nsISelectionListener.idl + */ + void EndBatchChanges(const char* aDetails, + int16_t aReason = nsISelectionListener::NO_REASON); + + /** + * NotifyAutoCopy() starts to notify AutoCopyListener of selection changes. + */ + void NotifyAutoCopy() { + MOZ_ASSERT(mSelectionType == SelectionType::eNormal); + + mNotifyAutoCopy = true; + } + + /** + * MaybeNotifyAccessibleCaretEventHub() starts to notify + * AccessibleCaretEventHub of selection change if aPresShell has it. + */ + void MaybeNotifyAccessibleCaretEventHub(PresShell* aPresShell); + + /** + * StopNotifyingAccessibleCaretEventHub() stops notifying + * AccessibleCaretEventHub of selection change. + */ + void StopNotifyingAccessibleCaretEventHub(); + + /** + * EnableSelectionChangeEvent() starts to notify + * SelectionChangeEventDispatcher of selection change to dispatch a + * selectionchange event at every selection change. + */ + void EnableSelectionChangeEvent() { + if (!mSelectionChangeEventDispatcher) { + mSelectionChangeEventDispatcher = new SelectionChangeEventDispatcher(); + } + } + + // Required for WebIDL bindings, see + // https://developer.mozilla.org/en-US/docs/Mozilla/WebIDL_bindings#Adding_WebIDL_bindings_to_a_class. + Document* GetParentObject() const; + + DocGroup* GetDocGroup() const; + + // utility methods for scrolling the selection into view + nsPresContext* GetPresContext() const; + PresShell* GetPresShell() const; + nsFrameSelection* GetFrameSelection() const { return mFrameSelection; } + // Returns a rect containing the selection region, and frame that that + // position is relative to. For SELECTION_ANCHOR_REGION or + // SELECTION_FOCUS_REGION the rect is a zero-width rectangle. For + // SELECTION_WHOLE_SELECTION the rect contains both the anchor and focus + // region rects. + nsIFrame* GetSelectionAnchorGeometry(SelectionRegion aRegion, nsRect* aRect); + // Returns the position of the region (SELECTION_ANCHOR_REGION or + // SELECTION_FOCUS_REGION only), and frame that that position is relative to. + // The 'position' is a zero-width rectangle. + nsIFrame* GetSelectionEndPointGeometry(SelectionRegion aRegion, + nsRect* aRect); + + nsresult PostScrollSelectionIntoViewEvent(SelectionRegion aRegion, + int32_t aFlags, + ScrollAxis aVertical, + ScrollAxis aHorizontal); + enum { + SCROLL_SYNCHRONOUS = 1 << 1, + SCROLL_FIRST_ANCESTOR_ONLY = 1 << 2, + SCROLL_DO_FLUSH = + 1 << 3, // only matters if SCROLL_SYNCHRONOUS is passed too + SCROLL_OVERFLOW_HIDDEN = 1 << 5, + SCROLL_FOR_CARET_MOVE = 1 << 6 + }; + // If aFlags doesn't contain SCROLL_SYNCHRONOUS, then we'll flush when + // the scroll event fires so we make sure to scroll to the right place. + // Otherwise, if SCROLL_DO_FLUSH is also in aFlags, then this method will + // flush layout and you MUST hold a strong ref on 'this' for the duration + // of this call. This might destroy arbitrary layout objects. + MOZ_CAN_RUN_SCRIPT nsresult + ScrollIntoView(SelectionRegion aRegion, ScrollAxis aVertical = ScrollAxis(), + ScrollAxis aHorizontal = ScrollAxis(), int32_t aFlags = 0); + + private: + static bool IsUserSelectionCollapsed( + const nsRange& aRange, nsTArray<RefPtr<nsRange>>& aTempRangesToAdd); + /** + * https://w3c.github.io/selection-api/#selectstart-event. + */ + enum class DispatchSelectstartEvent { + No, + Maybe, + }; + + /** + * See `AddRangesForSelectableNodes`. + */ + [[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult AddRangesForUserSelectableNodes( + nsRange* aRange, Maybe<size_t>* aOutIndex, + const DispatchSelectstartEvent aDispatchSelectstartEvent); + + /** + * Adds aRange to this Selection. If mUserInitiated is true, + * then aRange is first scanned for -moz-user-select:none nodes and split up + * into multiple ranges to exclude those before adding the resulting ranges + * to this Selection. + * + * @param aOutIndex points to the range last added, if at least one was added. + * If aRange is already contained, it points to the range + * containing it. Nothing() if mStyledRanges.mRanges was + * empty and no range was added. + */ + [[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult AddRangesForSelectableNodes( + nsRange* aRange, Maybe<size_t>* aOutIndex, + DispatchSelectstartEvent aDispatchSelectstartEvent); + + public: + nsresult RemoveCollapsedRanges(); + void Clear(nsPresContext* aPresContext); + MOZ_CAN_RUN_SCRIPT nsresult CollapseInLimiter(nsINode* aContainer, + uint32_t aOffset) { + if (!aContainer) { + return NS_ERROR_INVALID_ARG; + } + return CollapseInLimiter(RawRangeBoundary(aContainer, aOffset)); + } + MOZ_CAN_RUN_SCRIPT nsresult + CollapseInLimiter(const RawRangeBoundary& aPoint) { + ErrorResult result; + CollapseInLimiter(aPoint, result); + return result.StealNSResult(); + } + MOZ_CAN_RUN_SCRIPT void CollapseInLimiter(const RawRangeBoundary& aPoint, + ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT nsresult Extend(nsINode* aContainer, uint32_t aOffset); + + /** + * See mStyledRanges.mRanges. + */ + nsRange* GetRangeAt(uint32_t aIndex) const; + + /** + * @brief Get the |AbstractRange| at |aIndex|. + * + * This method is safe to be called for every selection type. + * However, |StaticRange|s only occur for |SelectionType::eHighlight|. + * If the SelectionType may be eHighlight, this method must be called instead + * of |GetRangeAt()|. + * + * Returns null if |aIndex| is out of bounds. + */ + AbstractRange* GetAbstractRangeAt(uint32_t aIndex) const; + // Get the anchor-to-focus range if we don't care which end is + // anchor and which end is focus. + const nsRange* GetAnchorFocusRange() const { return mAnchorFocusRange; } + + nsDirection GetDirection() const { return mDirection; } + + void SetDirection(nsDirection aDir) { mDirection = aDir; } + MOZ_CAN_RUN_SCRIPT nsresult SetAnchorFocusToRange(nsRange* aRange); + + MOZ_CAN_RUN_SCRIPT void ReplaceAnchorFocusRange(nsRange* aRange); + + void AdjustAnchorFocusForMultiRange(nsDirection aDirection); + + nsIFrame* GetPrimaryFrameForAnchorNode() const; + + /** + * Get primary frame and some other data for putting caret or extending + * selection at the focus point. + */ + PrimaryFrameData GetPrimaryFrameForCaretAtFocusNode(bool aVisual) const; + + UniquePtr<SelectionDetails> LookUpSelection( + nsIContent* aContent, uint32_t aContentOffset, uint32_t aContentLength, + UniquePtr<SelectionDetails> aDetailsHead, SelectionType aSelectionType, + bool aSlowCheck); + + NS_IMETHOD Repaint(nsPresContext* aPresContext); + + MOZ_CAN_RUN_SCRIPT + nsresult StartAutoScrollTimer(nsIFrame* aFrame, const nsPoint& aPoint, + uint32_t aDelayInMs); + + nsresult StopAutoScrollTimer(); + + JSObject* WrapObject(JSContext* aCx, + JS::Handle<JSObject*> aGivenProto) override; + + // WebIDL methods + nsINode* GetAnchorNode(CallerType aCallerType = CallerType::System) const { + const RangeBoundary& anchor = AnchorRef(); + nsINode* anchorNode = anchor.IsSet() ? anchor.Container() : nullptr; + if (!anchorNode || aCallerType == CallerType::System || + !anchorNode->ChromeOnlyAccess()) { + return anchorNode; + } + // anchor is nsIContent as ChromeOnlyAccess is nsIContent-only + return anchorNode->AsContent()->FindFirstNonChromeOnlyAccessContent(); + } + uint32_t AnchorOffset(CallerType aCallerType = CallerType::System) const { + const RangeBoundary& anchor = AnchorRef(); + if (aCallerType != CallerType::System && anchor.IsSet() && + anchor.Container()->ChromeOnlyAccess()) { + return 0; + } + const Maybe<uint32_t> offset = + anchor.Offset(RangeBoundary::OffsetFilter::kValidOffsets); + return offset ? *offset : 0; + } + nsINode* GetFocusNode(CallerType aCallerType = CallerType::System) const { + const RangeBoundary& focus = FocusRef(); + nsINode* focusNode = focus.IsSet() ? focus.Container() : nullptr; + if (!focusNode || aCallerType == CallerType::System || + !focusNode->ChromeOnlyAccess()) { + return focusNode; + } + // focus is nsIContent as ChromeOnlyAccess is nsIContent-only + return focusNode->AsContent()->FindFirstNonChromeOnlyAccessContent(); + } + uint32_t FocusOffset(CallerType aCallerType = CallerType::System) const { + const RangeBoundary& focus = FocusRef(); + if (aCallerType != CallerType::System && focus.IsSet() && + focus.Container()->ChromeOnlyAccess()) { + return 0; + } + const Maybe<uint32_t> offset = + focus.Offset(RangeBoundary::OffsetFilter::kValidOffsets); + return offset ? *offset : 0; + } + + nsIContent* GetChildAtAnchorOffset() { + const RangeBoundary& anchor = AnchorRef(); + return anchor.IsSet() ? anchor.GetChildAtOffset() : nullptr; + } + nsIContent* GetChildAtFocusOffset() { + const RangeBoundary& focus = FocusRef(); + return focus.IsSet() ? focus.GetChildAtOffset() : nullptr; + } + + const RangeBoundary& AnchorRef() const; + const RangeBoundary& FocusRef() const; + + /* + * IsCollapsed -- is the whole selection just one point, or unset? + */ + bool IsCollapsed() const { + size_t cnt = mStyledRanges.Length(); + if (cnt == 0) { + return true; + } + + if (cnt != 1) { + return false; + } + + return mStyledRanges.mRanges[0].mRange->Collapsed(); + } + + // *JS() methods are mapped to Selection.*(). + // They may move focus only when the range represents normal selection. + // These methods shouldn't be used by non-JS callers. + MOZ_CAN_RUN_SCRIPT void CollapseJS(nsINode* aContainer, uint32_t aOffset, + mozilla::ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT void CollapseToStartJS(mozilla::ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT void CollapseToEndJS(mozilla::ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT void ExtendJS(nsINode& aContainer, uint32_t aOffset, + mozilla::ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT void SelectAllChildrenJS(nsINode& aNode, + mozilla::ErrorResult& aRv); + + /** + * Deletes this selection from document the nodes belong to. + * Only if this has `SelectionType::eNormal`. + */ + MOZ_CAN_RUN_SCRIPT void DeleteFromDocument(mozilla::ErrorResult& aRv); + + uint32_t RangeCount() const { return mStyledRanges.Length(); } + + void GetType(nsAString& aOutType) const; + + nsRange* GetRangeAt(uint32_t aIndex, mozilla::ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT void AddRangeJS(nsRange& aRange, + mozilla::ErrorResult& aRv); + + /** + * Callers need to keep `aRange` alive. + */ + MOZ_CAN_RUN_SCRIPT void RemoveRangeAndUnselectFramesAndNotifyListeners( + AbstractRange& aRange, mozilla::ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT void RemoveAllRanges(mozilla::ErrorResult& aRv); + + /** + * Whether Stringify should flush layout or not. + */ + enum class FlushFrames { No, Yes }; + MOZ_CAN_RUN_SCRIPT + void Stringify(nsAString& aResult, FlushFrames = FlushFrames::Yes); + + /** + * Indicates whether the node is part of the selection. If partlyContained + * is true, the function returns true when some part of the node + * is part of the selection. If partlyContained is false, the + * function only returns true when the entire node is part of the selection. + */ + bool ContainsNode(nsINode& aNode, bool aPartlyContained, + mozilla::ErrorResult& aRv); + + /** + * Check to see if the given point is contained within the selection area. In + * particular, this iterates through all the rects that make up the selection, + * not just the bounding box, and checks to see if the given point is + * contained in any one of them. + * @param aPoint The point to check, relative to the root frame. + */ + bool ContainsPoint(const nsPoint& aPoint); + + /** + * Modifies the selection. Note that the parameters are case-insensitive. + * + * @param alter can be one of { "move", "extend" } + * - "move" collapses the selection to the end of the selection and + * applies the movement direction/granularity to the collapsed + * selection. + * - "extend" leaves the start of the selection unchanged, and applies + * movement direction/granularity to the end of the selection. + * @param direction can be one of { "forward", "backward", "left", "right" } + * @param granularity can be one of { "character", "word", + * "line", "lineboundary" } + * + * @throws NS_ERROR_NOT_IMPLEMENTED if the granularity is "sentence", + * "sentenceboundary", "paragraph", "paragraphboundary", or + * "documentboundary". Throws NS_ERROR_INVALID_ARG if alter, direction, + * or granularity has an unrecognized value. + */ + MOZ_CAN_RUN_SCRIPT void Modify(const nsAString& aAlter, + const nsAString& aDirection, + const nsAString& aGranularity, + mozilla::ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT + void SetBaseAndExtentJS(nsINode& aAnchorNode, uint32_t aAnchorOffset, + nsINode& aFocusNode, uint32_t aFocusOffset, + mozilla::ErrorResult& aRv); + + bool GetInterlinePositionJS(mozilla::ErrorResult& aRv) const; + void SetInterlinePositionJS(bool aHintRight, mozilla::ErrorResult& aRv); + + enum class InterlinePosition : uint8_t { + // Caret should be put at end of line (i.e., before the line break) + EndOfLine, + // Caret should be put at start of next line (i.e., after the line break) + StartOfNextLine, + // Undefined means only what is not EndOfLine nor StartOfNextLine. + // `SetInterlinePosition` should never be called with this value, and + // if `GetInterlinePosition` returns this, it means that the instance has + // not been initialized or cleared by the cycle collector or something. + // If a method needs to consider whether to call `SetInterlinePosition` or + // not call, this value can be used for the latter. + Undefined, + }; + InterlinePosition GetInterlinePosition() const; + nsresult SetInterlinePosition(InterlinePosition aInterlinePosition); + + Nullable<int16_t> GetCaretBidiLevel(mozilla::ErrorResult& aRv) const; + void SetCaretBidiLevel(const Nullable<int16_t>& aCaretBidiLevel, + mozilla::ErrorResult& aRv); + + void ToStringWithFormat(const nsAString& aFormatType, uint32_t aFlags, + int32_t aWrapColumn, nsAString& aReturn, + mozilla::ErrorResult& aRv); + void AddSelectionListener(nsISelectionListener* aListener); + void RemoveSelectionListener(nsISelectionListener* aListener); + + RawSelectionType RawType() const { + return ToRawSelectionType(mSelectionType); + } + SelectionType Type() const { return mSelectionType; } + + /** + * @brief Sets highlight selection properties. + * + * This includes the highlight name as well as its priority and type. + */ + void SetHighlightSelectionData( + HighlightSelectionData aHighlightSelectionData); + + /** + * See documentation of `GetRangesForInterval` in Selection.webidl. + * + * @param aReturn references, not copies, of the internal ranges. + */ + void GetRangesForInterval(nsINode& aBeginNode, uint32_t aBeginOffset, + nsINode& aEndNode, uint32_t aEndOffset, + bool aAllowAdjacent, + nsTArray<RefPtr<nsRange>>& aReturn, + ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT void ScrollIntoView(int16_t aRegion, bool aIsSynchronous, + int16_t aVPercent, int16_t aHPercent, + ErrorResult& aRv); + + void SetColors(const nsAString& aForeColor, const nsAString& aBackColor, + const nsAString& aAltForeColor, const nsAString& aAltBackColor, + ErrorResult& aRv); + + void ResetColors(); + + /** + * Non-JS callers should use the following + * collapse/collapseToStart/extend/etc methods, instead of the *JS + * versions that bindings call. + */ + + /** + * Collapses the selection to a single point, at the specified offset + * in the given node. When the selection is collapsed, and the content + * is focused and editable, the caret will blink there. + * @param aContainer The given node where the selection will be set + * @param aOffset Where in given dom node to place the selection (the + * offset into the given node) + */ + MOZ_CAN_RUN_SCRIPT void CollapseInLimiter(nsINode& aContainer, + uint32_t aOffset, + ErrorResult& aRv) { + CollapseInLimiter(RawRangeBoundary(&aContainer, aOffset), aRv); + } + + private: + enum class InLimiter { + // If eYes, the method may reset selection limiter and move focus if the + // given range is out of the limiter. + eYes, + // If eNo, the method won't reset selection limiter. So, if given range + // is out of bounds, the method may return error. + eNo, + }; + MOZ_CAN_RUN_SCRIPT + void CollapseInternal(InLimiter aInLimiter, const RawRangeBoundary& aPoint, + ErrorResult& aRv); + + public: + /** + * Collapses the whole selection to a single point at the start + * of the current selection (irrespective of direction). If content + * is focused and editable, the caret will blink there. + */ + MOZ_CAN_RUN_SCRIPT void CollapseToStart(mozilla::ErrorResult& aRv); + + /** + * Collapses the whole selection to a single point at the end + * of the current selection (irrespective of direction). If content + * is focused and editable, the caret will blink there. + */ + MOZ_CAN_RUN_SCRIPT void CollapseToEnd(mozilla::ErrorResult& aRv); + + /** + * Extends the selection by moving the selection end to the specified node and + * offset, preserving the selection begin position. The new selection end + * result will always be from the anchorNode to the new focusNode, regardless + * of direction. + * + * @param aContainer The node where the selection will be extended to + * @param aOffset Where in aContainer to place the offset of the new + * selection end. + */ + MOZ_CAN_RUN_SCRIPT void Extend(nsINode& aContainer, uint32_t aOffset, + ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT void AddRangeAndSelectFramesAndNotifyListeners( + nsRange& aRange, mozilla::ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT void AddHighlightRangeAndSelectFramesAndNotifyListeners( + AbstractRange& aRange); + + /** + * Adds all children of the specified node to the selection. + * @param aNode the parent of the children to be added to the selection. + */ + MOZ_CAN_RUN_SCRIPT void SelectAllChildren(nsINode& aNode, + mozilla::ErrorResult& aRv); + + /** + * SetStartAndEnd() removes all ranges and sets new range as given range. + * Different from SetBaseAndExtent(), this won't compare the DOM points of + * aStartRef and aEndRef for performance nor set direction to eDirPrevious. + * Note that this may reset the limiter and move focus. If you don't want + * that, use SetStartAndEndInLimiter() instead. + */ + MOZ_CAN_RUN_SCRIPT + void SetStartAndEnd(const RawRangeBoundary& aStartRef, + const RawRangeBoundary& aEndRef, ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT + void SetStartAndEnd(nsINode& aStartContainer, uint32_t aStartOffset, + nsINode& aEndContainer, uint32_t aEndOffset, + ErrorResult& aRv) { + SetStartAndEnd(RawRangeBoundary(&aStartContainer, aStartOffset), + RawRangeBoundary(&aEndContainer, aEndOffset), aRv); + } + + /** + * SetStartAndEndInLimiter() is similar to SetStartAndEnd(), but this respects + * the selection limiter. If all or part of given range is not in the + * limiter, this returns error. + */ + MOZ_CAN_RUN_SCRIPT + void SetStartAndEndInLimiter(const RawRangeBoundary& aStartRef, + const RawRangeBoundary& aEndRef, + ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT + void SetStartAndEndInLimiter(nsINode& aStartContainer, uint32_t aStartOffset, + nsINode& aEndContainer, uint32_t aEndOffset, + ErrorResult& aRv) { + SetStartAndEndInLimiter(RawRangeBoundary(&aStartContainer, aStartOffset), + RawRangeBoundary(&aEndContainer, aEndOffset), aRv); + } + MOZ_CAN_RUN_SCRIPT + Result<Ok, nsresult> SetStartAndEndInLimiter( + nsINode& aStartContainer, uint32_t aStartOffset, nsINode& aEndContainer, + uint32_t aEndOffset, nsDirection aDirection, int16_t aReason); + + /** + * SetBaseAndExtent() is alternative of the JS API for internal use. + * Different from SetStartAndEnd(), this sets anchor and focus points as + * specified, then if anchor point is after focus node, this sets the + * direction to eDirPrevious. + * Note that this may reset the limiter and move focus. If you don't want + * that, use SetBaseAndExtentInLimier() instead. + */ + MOZ_CAN_RUN_SCRIPT + void SetBaseAndExtent(nsINode& aAnchorNode, uint32_t aAnchorOffset, + nsINode& aFocusNode, uint32_t aFocusOffset, + ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT + void SetBaseAndExtent(const RawRangeBoundary& aAnchorRef, + const RawRangeBoundary& aFocusRef, ErrorResult& aRv); + + /** + * SetBaseAndExtentInLimiter() is similar to SetBaseAndExtent(), but this + * respects the selection limiter. If all or part of given range is not in + * the limiter, this returns error. + */ + MOZ_CAN_RUN_SCRIPT + void SetBaseAndExtentInLimiter(nsINode& aAnchorNode, uint32_t aAnchorOffset, + nsINode& aFocusNode, uint32_t aFocusOffset, + ErrorResult& aRv) { + SetBaseAndExtentInLimiter(RawRangeBoundary(&aAnchorNode, aAnchorOffset), + RawRangeBoundary(&aFocusNode, aFocusOffset), aRv); + } + MOZ_CAN_RUN_SCRIPT + void SetBaseAndExtentInLimiter(const RawRangeBoundary& aAnchorRef, + const RawRangeBoundary& aFocusRef, + ErrorResult& aRv); + + void AddSelectionChangeBlocker(); + void RemoveSelectionChangeBlocker(); + bool IsBlockingSelectionChangeEvents() const; + + // Whether this selection is focused in an editable element. + bool IsEditorSelection() const; + + /** + * Set the painting style for the range. The range must be a range in + * the selection. The textRangeStyle will be used by text frame + * when it is painting the selection. + */ + nsresult SetTextRangeStyle(nsRange* aRange, + const TextRangeStyle& aTextRangeStyle); + + // Methods to manipulate our mFrameSelection's ancestor limiter. + nsIContent* GetAncestorLimiter() const; + void SetAncestorLimiter(nsIContent* aLimiter); + + /* + * Frame Offset cache can be used just during calling + * nsEditor::EndPlaceHolderTransaction. EndPlaceHolderTransaction will give + * rise to reflow/refreshing view/scroll, and call times of + * nsTextFrame::GetPointFromOffset whose return value is to be cached. see + * bugs 35296 and 199412 + */ + void SetCanCacheFrameOffset(bool aCanCacheFrameOffset); + + // Selection::GetAbstractRangesForIntervalArray + // + // Fills a nsTArray with the ranges overlapping the range specified by + // the given endpoints. Ranges in the selection exactly adjacent to the + // input range are not returned unless aAllowAdjacent is set. + // + // For example, if the following ranges were in the selection + // (assume everything is within the same node) + // + // Start Offset: 0 2 7 9 + // End Offset: 2 5 9 10 + // + // and passed aBeginOffset of 2 and aEndOffset of 9, then with + // aAllowAdjacent set, all the ranges should be returned. If + // aAllowAdjacent was false, the ranges [2, 5] and [7, 9] only + // should be returned + // + // Now that overlapping ranges are disallowed, there can be a maximum of + // 2 adjacent ranges + nsresult GetAbstractRangesForIntervalArray(nsINode* aBeginNode, + uint32_t aBeginOffset, + nsINode* aEndNode, + uint32_t aEndOffset, + bool aAllowAdjacent, + nsTArray<AbstractRange*>* aRanges); + + /** + * Converts the results of |GetAbstractRangesForIntervalArray()| to |nsRange|. + * + * |StaticRange|s can only occur in Selections of type |eHighlight|. + * Therefore, this method must not be called for this selection type + * as not every |AbstractRange| can be cast to |nsRange|. + */ + nsresult GetDynamicRangesForIntervalArray( + nsINode* aBeginNode, uint32_t aBeginOffset, nsINode* aEndNode, + uint32_t aEndOffset, bool aAllowAdjacent, nsTArray<nsRange*>* aRanges); + + /** + * Modifies the cursor Bidi level after a change in keyboard direction + * @param langRTL is true if the new language is right-to-left or + * false if the new language is left-to-right. + */ + nsresult SelectionLanguageChange(bool aLangRTL); + + private: + bool HasSameRootOrSameComposedDoc(const nsINode& aNode); + + // XXX Please don't add additional uses of this method, it's only for + // XXX supporting broken code (bug 1245883) in the following classes: + friend class ::nsCopySupport; + friend class ::nsHTMLCopyEncoder; + MOZ_CAN_RUN_SCRIPT + void AddRangeAndSelectFramesAndNotifyListenersInternal(nsRange& aRange, + Document* aDocument, + ErrorResult&); + + // Get the cached value for nsTextFrame::GetPointFromOffset. + nsresult GetCachedFrameOffset(nsIFrame* aFrame, int32_t inOffset, + nsPoint& aPoint); + + MOZ_CAN_RUN_SCRIPT + void SetStartAndEndInternal(InLimiter aInLimiter, + const RawRangeBoundary& aStartRef, + const RawRangeBoundary& aEndRef, + nsDirection aDirection, ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT + void SetBaseAndExtentInternal(InLimiter aInLimiter, + const RawRangeBoundary& aAnchorRef, + const RawRangeBoundary& aFocusRef, + ErrorResult& aRv); + + public: + SelectionType GetType() const { return mSelectionType; } + + SelectionCustomColors* GetCustomColors() const { return mCustomColors.get(); } + + MOZ_CAN_RUN_SCRIPT void NotifySelectionListeners(bool aCalledByJS); + MOZ_CAN_RUN_SCRIPT void NotifySelectionListeners(); + + friend struct AutoUserInitiated; + struct MOZ_RAII AutoUserInitiated { + explicit AutoUserInitiated(Selection& aSelectionRef) + : AutoUserInitiated(&aSelectionRef) {} + explicit AutoUserInitiated(Selection* aSelection) + : mSavedValue(aSelection->mUserInitiated) { + aSelection->mUserInitiated = true; + } + AutoRestore<bool> mSavedValue; + }; + + private: + friend struct mozilla::AutoPrepareFocusRange; + class ScrollSelectionIntoViewEvent; + friend class ScrollSelectionIntoViewEvent; + + class ScrollSelectionIntoViewEvent : public Runnable { + public: + MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_DECL_NSIRUNNABLE + + ScrollSelectionIntoViewEvent(Selection* aSelection, SelectionRegion aRegion, + ScrollAxis aVertical, ScrollAxis aHorizontal, + int32_t aFlags) + : Runnable("dom::Selection::ScrollSelectionIntoViewEvent"), + mSelection(aSelection), + mRegion(aRegion), + mVerticalScroll(aVertical), + mHorizontalScroll(aHorizontal), + mFlags(aFlags) { + NS_ASSERTION(aSelection, "null parameter"); + } + void Revoke() { mSelection = nullptr; } + + private: + Selection* mSelection; + SelectionRegion mRegion; + ScrollAxis mVerticalScroll; + ScrollAxis mHorizontalScroll; + int32_t mFlags; + }; + + /** + * Set mAnchorFocusRange to mStyledRanges.mRanges[aIndex] if aIndex is a valid + * index. + */ + void SetAnchorFocusRange(size_t aIndex); + void RemoveAnchorFocusRange() { mAnchorFocusRange = nullptr; } + void SelectFramesOf(nsIContent* aContent, bool aSelected) const; + + /** + * https://dom.spec.whatwg.org/#concept-tree-inclusive-descendant. + */ + nsresult SelectFramesOfInclusiveDescendantsOfContent( + PostContentIterator& aPostOrderIter, nsIContent* aContent, + bool aSelected) const; + + nsresult SelectFrames(nsPresContext* aPresContext, AbstractRange& aRange, + bool aSelect) const; + + /** + * SelectFramesInAllRanges() calls SelectFrames() for all current + * ranges. + */ + void SelectFramesInAllRanges(nsPresContext* aPresContext); + + /** + * @param aOutIndex If some, points to the index of the range in + * mStyledRanges.mRanges so that it's always in [0, mStyledRanges.Length()]. + * Otherwise, if nothing, this didn't add the range to mStyledRanges. + */ + MOZ_CAN_RUN_SCRIPT nsresult MaybeAddTableCellRange(nsRange& aRange, + Maybe<size_t>* aOutIndex); + + Document* GetDocument() const; + + MOZ_CAN_RUN_SCRIPT void RemoveAllRangesInternal(mozilla::ErrorResult& aRv); + + void Disconnect(); + + struct StyledRanges { + explicit StyledRanges(Selection& aSelection) : mSelection(aSelection) {} + void Clear(); + + StyledRange* FindRangeData(AbstractRange* aRange); + + using StyledRangeArray = AutoTArray<StyledRange, 1>; + + StyledRangeArray::size_type Length() const; + + nsresult RemoveCollapsedRanges(); + + nsresult RemoveRangeAndUnregisterSelection(AbstractRange& aRange); + + /** + * Binary searches the given sorted array of ranges for the insertion point + * for the given node/offset. The given comparator is used, and the index + * where the point should appear in the array is returned. + + * If there is an item in the array equal to the input point (aPointNode, + * aPointOffset), we will return the index of this item. + * + * @return the index where the point should appear in the array. In + * [0, `aElementArray->Length()`]. + */ + static size_t FindInsertionPoint( + const nsTArray<StyledRange>* aElementArray, const nsINode& aPointNode, + uint32_t aPointOffset, + int32_t (*aComparator)(const nsINode&, uint32_t, const AbstractRange&)); + + /** + * Works on the same principle as GetRangesForIntervalArray, however + * instead this returns the indices into mRanges between which + * the overlapping ranges lie. + * + * @param aStartIndex If some, aEndIndex will also be some and the value of + * aStartIndex will be less or equal than aEndIndex. If + * nothing, aEndIndex will also be nothing and it means + * that there is no range which in the range. + * @param aEndIndex If some, the value is less than mRanges.Length(). + */ + nsresult GetIndicesForInterval(const nsINode* aBeginNode, + uint32_t aBeginOffset, + const nsINode* aEndNode, uint32_t aEndOffset, + bool aAllowAdjacent, + Maybe<size_t>& aStartIndex, + Maybe<size_t>& aEndIndex); + + bool HasEqualRangeBoundariesAt(const AbstractRange& aRange, + size_t aRangeIndex) const; + + /** + * Preserves the sorting and disjunctiveness of mRanges. + * + * @param aOutIndex If some, will point to the index of the added range, or + * if aRange is already contained, to the one containing + * it. Hence it'll always be in [0, mRanges.Length()). + * This is nothing only when the method returns an error. + */ + MOZ_CAN_RUN_SCRIPT nsresult + MaybeAddRangeAndTruncateOverlaps(nsRange* aRange, Maybe<size_t>* aOutIndex); + + /** + * Adds the range even if there are overlaps. + */ + MOZ_CAN_RUN_SCRIPT nsresult + AddRangeAndIgnoreOverlaps(AbstractRange* aRange); + + /** + * GetCommonEditingHost() returns common editing host of all + * ranges if there is. If at least one of the ranges is in non-editable + * element, returns nullptr. See following examples for the detail: + * + * <div id="a" contenteditable> + * an[cestor + * <div id="b" contenteditable="false"> + * non-editable + * <div id="c" contenteditable> + * desc]endant + * in this case, this returns div#a because div#c is also in div#a. + * + * <div id="a" contenteditable> + * an[ce]stor + * <div id="b" contenteditable="false"> + * non-editable + * <div id="c" contenteditable> + * de[sc]endant + * in this case, this returns div#a because second range is also in div#a + * and common ancestor of the range (i.e., div#c) is editable. + * + * <div id="a" contenteditable> + * an[ce]stor + * <div id="b" contenteditable="false"> + * [non]-editable + * <div id="c" contenteditable> + * de[sc]endant + * in this case, this returns nullptr because the second range is in + * non-editable area. + */ + Element* GetCommonEditingHost() const; + + MOZ_CAN_RUN_SCRIPT void MaybeFocusCommonEditingHost( + PresShell* aPresShell) const; + + static nsresult SubtractRange(StyledRange& aRange, nsRange& aSubtract, + nsTArray<StyledRange>* aOutput); + + void UnregisterSelection(); + + // `mRanges` always needs to be sorted by the Range's start point. + // Especially when dealing with `StaticRange`s this is not guaranteed + // automatically. Therefore this method should be called before paint to + // ensure that any potential DOM mutations are incorporated in `mRanges` + // order. This method will also move invalid `StaticRange`s into + // `mInvalidStaticRanges` (and previously-invalid-now-valid-again + // `StaticRange`s back into `mRanges`). + void ReorderRangesIfNecessary(); + + // These are the ranges inside this selection. They are kept sorted in order + // of DOM start position. + // + // This data structure is sorted by the range beginnings. As the ranges are + // disjoint, it is also implicitly sorted by the range endings. This allows + // us to perform binary searches when searching for existence of a range, + // giving us O(log n) search time. + // + // Inserting a new range requires finding the overlapping interval, + // requiring two binary searches plus up to an additional 6 DOM comparisons. + // If this proves to be a performance concern, then an interval tree may be + // a possible solution, allowing the calculation of the overlap interval in + // O(log n) time, though this would require rebalancing and other overhead. + StyledRangeArray mRanges; + + // With introduction of the custom highlight API, Selection must be able to + // hold `StaticRange`s as well. If they become invalid (eg. end is before + // start), they must be excluded from painting, but still kept. + // mRanges needs to contain valid ranges sorted correctly only. Therefore, + // invalid static ranges are being stored in this array, which is being kept + // up to date in `ReorderRangesIfNecessary()`. + StyledRangeArray mInvalidStaticRanges; + + Selection& mSelection; + + // The Document's generation for which `mRanges` have been ordered. + int32_t mDocumentGeneration{0}; + // This flag indicates that ranges may have changed. It is set to true in + // `Selection::NotifySelectionListeners().` + bool mRangesMightHaveChanged{false}; + }; + + StyledRanges mStyledRanges{*this}; + + RefPtr<nsRange> mAnchorFocusRange; + RefPtr<nsFrameSelection> mFrameSelection; + RefPtr<AccessibleCaretEventHub> mAccessibleCaretEventHub; + RefPtr<SelectionChangeEventDispatcher> mSelectionChangeEventDispatcher; + RefPtr<AutoScroller> mAutoScroller; + nsTArray<nsCOMPtr<nsISelectionListener>> mSelectionListeners; + nsRevocableEventPtr<ScrollSelectionIntoViewEvent> mScrollEvent; + CachedOffsetForFrame* mCachedOffsetForFrame; + nsDirection mDirection; + const SelectionType mSelectionType; + HighlightSelectionData mHighlightData; + UniquePtr<SelectionCustomColors> mCustomColors; + + // Non-zero if we don't want any changes we make to the selection to be + // visible to content. If non-zero, content won't be notified about changes. + uint32_t mSelectionChangeBlockerCount; + + /** + * True if the current selection operation was initiated by user action. + * It determines whether we exclude -moz-user-select:none nodes or not, + * as well as whether selectstart events will be fired. + */ + bool mUserInitiated; + + /** + * When the selection change is caused by a call of Selection API, + * mCalledByJS is true. Otherwise, false. + */ + bool mCalledByJS; + + /** + * true if AutoCopyListner::OnSelectionChange() should be called. + */ + bool mNotifyAutoCopy; +}; + +// Stack-class to turn on/off selection batching. +class MOZ_STACK_CLASS SelectionBatcher final { + private: + const RefPtr<Selection> mSelection; + const int16_t mReasons; + const char* const mRequesterFuncName; + + public: + /** + * @param aRequesterFuncName function name which wants the selection batch. + * This won't be stored nor exposed to selection listeners etc, used only for + * logging. This MUST be living when the destructor runs. + */ + // TODO: Mark these constructors `MOZ_CAN_RUN_SCRIPT` because the destructor + // may run script via nsISelectionListener. + explicit SelectionBatcher(Selection& aSelectionRef, + const char* aRequesterFuncName, + int16_t aReasons = nsISelectionListener::NO_REASON) + : SelectionBatcher(&aSelectionRef, aRequesterFuncName, aReasons) {} + explicit SelectionBatcher(Selection* aSelection, + const char* aRequesterFuncName, + int16_t aReasons = nsISelectionListener::NO_REASON) + : mSelection(aSelection), + mReasons(aReasons), + mRequesterFuncName(aRequesterFuncName) { + if (mSelection) { + mSelection->StartBatchChanges(mRequesterFuncName); + } + } + + ~SelectionBatcher() { + if (mSelection) { + mSelection->EndBatchChanges(mRequesterFuncName, mReasons); + } + } +}; + +class MOZ_RAII AutoHideSelectionChanges final { + public: + explicit AutoHideSelectionChanges(const nsFrameSelection* aFrame); + + explicit AutoHideSelectionChanges(Selection& aSelectionRef) + : AutoHideSelectionChanges(&aSelectionRef) {} + + ~AutoHideSelectionChanges() { + if (mSelection) { + mSelection->RemoveSelectionChangeBlocker(); + } + } + + private: + explicit AutoHideSelectionChanges(Selection* aSelection) + : mSelection(aSelection) { + if (mSelection) { + mSelection->AddSelectionChangeBlocker(); + } + } + + RefPtr<Selection> mSelection; +}; + +} // namespace dom + +inline bool IsValidRawSelectionType(RawSelectionType aRawSelectionType) { + return aRawSelectionType >= nsISelectionController::SELECTION_NONE && + aRawSelectionType <= nsISelectionController::SELECTION_URLSTRIKEOUT; +} + +inline SelectionType ToSelectionType(RawSelectionType aRawSelectionType) { + if (!IsValidRawSelectionType(aRawSelectionType)) { + return SelectionType::eInvalid; + } + return static_cast<SelectionType>(aRawSelectionType); +} + +inline RawSelectionType ToRawSelectionType(SelectionType aSelectionType) { + MOZ_ASSERT(aSelectionType != SelectionType::eInvalid); + return static_cast<RawSelectionType>(aSelectionType); +} + +inline RawSelectionType ToRawSelectionType(TextRangeType aTextRangeType) { + return ToRawSelectionType(ToSelectionType(aTextRangeType)); +} + +inline SelectionTypeMask ToSelectionTypeMask(SelectionType aSelectionType) { + MOZ_ASSERT(aSelectionType != SelectionType::eInvalid); + return aSelectionType == SelectionType::eNone + ? 0 + : static_cast<SelectionTypeMask>( + 1 << (static_cast<uint8_t>(aSelectionType) - 1)); +} + +inline std::ostream& operator<<( + std::ostream& aStream, const dom::Selection::InterlinePosition& aPosition) { + using InterlinePosition = dom::Selection::InterlinePosition; + switch (aPosition) { + case InterlinePosition::EndOfLine: + return aStream << "InterlinePosition::EndOfLine"; + case InterlinePosition::StartOfNextLine: + return aStream << "InterlinePosition::StartOfNextLine"; + case InterlinePosition::Undefined: + return aStream << "InterlinePosition::Undefined"; + default: + MOZ_ASSERT_UNREACHABLE("Illegal value"); + return aStream << "<Illegal value>"; + } +} + +} // namespace mozilla + +#endif // mozilla_Selection_h__ |