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fune/layout/generic/nsFrameSelection.h
Masayuki Nakano 022eb9e926 Bug 1897255 - Make nsIFrame::PeekOffsetForLine won't cross editing host boundary unless the callers allows that r=emilio, a=dmeehan 
The problems in the testcase are, `nsIFrame::PeekOffsetForLine` returns a frame
for any content node outside the editing host and `nsIFrame::GetLastLeaf`
returns a native anonymous subtree node if the frame is for the native
anonymous subtree root like `<input>` or `<textarea>`.

For fixing the former, the methods need to check whether found frame's editable
state **and** whether the editable node is an inclusive descendant of the
editing host.  However, there are complicated cases with inline editing hosts
and elements whose `contenteditable` is set to `false` and this is a new
regression for ESR 128.  Therefore, we need to fix this without any behavior
changes as far as possible.  Therefore, this patch basically checks only whether
the editing state of found one is editable and/or whether the one is an
inclusive descendant of the editing host to avoid `Selection` moves outside the
editing host.  The reaming complicated cases should be handled in new bugs which
blocks bug 1873155.

For fixing the latter, `nsIFrame::GetLastLeaf` needs to check the given frame's
content is a native anonymous subtree root or not.

Differential Revision: https://phabricator.services.mozilla.com/D216371
2024-07-19 08:13:10 +00:00

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/* -*- 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 nsFrameSelection_h___
#define nsFrameSelection_h___
#include <stdint.h>
#include "mozilla/intl/BidiEmbeddingLevel.h"
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/CaretAssociationHint.h"
#include "mozilla/CompactPair.h"
#include "mozilla/EnumSet.h"
#include "mozilla/EventForwards.h"
#include "mozilla/dom/Highlight.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/Result.h"
#include "mozilla/TextRange.h"
#include "mozilla/UniquePtr.h"
#include "nsIFrame.h"
#include "nsIContent.h"
#include "nsISelectionController.h"
#include "nsISelectionListener.h"
#include "nsITableCellLayout.h"
#include "WordMovementType.h"
#include "nsBidiPresUtils.h"
class nsRange;
#define BIDI_LEVEL_UNDEFINED mozilla::intl::BidiEmbeddingLevel(0x80)
//----------------------------------------------------------------------
// Selection interface
struct SelectionDetails {
SelectionDetails()
: mStart(), mEnd(), mSelectionType(mozilla::SelectionType::eInvalid) {
MOZ_COUNT_CTOR(SelectionDetails);
}
MOZ_COUNTED_DTOR(SelectionDetails)
int32_t mStart;
int32_t mEnd;
mozilla::SelectionType mSelectionType;
mozilla::dom::HighlightSelectionData mHighlightData;
mozilla::TextRangeStyle mTextRangeStyle;
mozilla::UniquePtr<SelectionDetails> mNext;
};
struct SelectionCustomColors {
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNTED_DEFAULT_CTOR(SelectionCustomColors)
MOZ_COUNTED_DTOR(SelectionCustomColors)
#endif
mozilla::Maybe<nscolor> mForegroundColor;
mozilla::Maybe<nscolor> mBackgroundColor;
mozilla::Maybe<nscolor> mAltForegroundColor;
mozilla::Maybe<nscolor> mAltBackgroundColor;
};
namespace mozilla {
class PresShell;
/** PeekOffsetStruct is used to group various arguments (both input and output)
* that are passed to nsIFrame::PeekOffset(). See below for the description of
* individual arguments.
*/
enum class PeekOffsetOption : uint16_t {
// Whether to allow jumping across line boundaries.
//
// Used with: eSelectCharacter, eSelectWord.
JumpLines,
// Whether we should preserve or trim spaces at begin/end of content
PreserveSpaces,
// Whether to stop when reaching a scroll view boundary.
//
// Used with: eSelectCharacter, eSelectWord, eSelectLine.
StopAtScroller,
// Whether to stop when reaching a placeholder frame.
StopAtPlaceholder,
// Whether the peeking is done in response to a keyboard action.
//
// Used with: eSelectWord.
IsKeyboardSelect,
// Whether bidi caret behavior is visual (set) or logical (unset).
//
// Used with: eSelectCharacter, eSelectWord, eSelectBeginLine, eSelectEndLine.
Visual,
// Whether the selection is being extended or moved.
Extend,
// If true, the offset has to end up in an editable node, otherwise we'll keep
// searching.
ForceEditableRegion,
};
using PeekOffsetOptions = EnumSet<PeekOffsetOption>;
struct MOZ_STACK_CLASS PeekOffsetStruct {
PeekOffsetStruct(nsSelectionAmount aAmount, nsDirection aDirection,
int32_t aStartOffset, nsPoint aDesiredCaretPos,
// Passing by value here is intentional because EnumSet
// is optimized as uint*_t in opt builds.
const PeekOffsetOptions aOptions,
EWordMovementType aWordMovementType = eDefaultBehavior,
const dom::Element* aAncestorLimiter = nullptr);
/**
* Return true if the ancestor limiter is not specified or if the content for
* aFrame is an inclusive descendant of mAncestorLimiter.
*/
[[nodiscard]] bool FrameContentIsInAncestorLimiter(
const nsIFrame* aFrame) const {
return !mAncestorLimiter ||
(aFrame->GetContent() &&
aFrame->GetContent()->IsInclusiveDescendantOf(mAncestorLimiter));
}
// Note: Most arguments (input and output) are only used with certain values
// of mAmount. These values are indicated for each argument below.
// Arguments with no such indication are used with all values of mAmount.
/*** Input arguments ***/
// Note: The value of some of the input arguments may be changed upon exit.
// The type of movement requested (by character, word, line, etc.)
nsSelectionAmount mAmount;
// eDirPrevious or eDirNext.
//
// Note for visual bidi movement:
// * eDirPrevious means 'left-then-up' if the containing block is LTR,
// 'right-then-up' if it is RTL.
// * eDirNext means 'right-then-down' if the containing block is LTR,
// 'left-then-down' if it is RTL.
// * Between paragraphs, eDirPrevious means "go to the visual end of
// the previous paragraph", and eDirNext means "go to the visual
// beginning of the next paragraph".
//
// Used with: eSelectCharacter, eSelectWord, eSelectLine, eSelectParagraph.
const nsDirection mDirection;
// Offset into the content of the current frame where the peek starts.
//
// Used with: eSelectCharacter, eSelectWord
int32_t mStartOffset;
// The desired inline coordinate for the caret (one of .x or .y will be used,
// depending on line's writing mode)
//
// Used with: eSelectLine.
const nsPoint mDesiredCaretPos;
// An enum that determines whether to prefer the start or end of a word or to
// use the default behavior, which is a combination of direction and the
// platform-based pref "layout.word_select.eat_space_to_next_word"
EWordMovementType mWordMovementType;
PeekOffsetOptions mOptions;
// The ancestor limiter element to peek offset.
const dom::Element* const mAncestorLimiter;
/*** Output arguments ***/
// Content reached as a result of the peek.
nsCOMPtr<nsIContent> mResultContent;
// Frame reached as a result of the peek.
//
// Used with: eSelectCharacter, eSelectWord.
nsIFrame* mResultFrame;
// Offset into content reached as a result of the peek.
int32_t mContentOffset;
// When the result position is between two frames, indicates which of the two
// frames the caret should be painted in. false means "the end of the frame
// logically before the caret", true means "the beginning of the frame
// logically after the caret".
//
// Used with: eSelectLine, eSelectBeginLine, eSelectEndLine.
CaretAssociationHint mAttach;
};
} // namespace mozilla
struct nsPrevNextBidiLevels {
void SetData(nsIFrame* aFrameBefore, nsIFrame* aFrameAfter,
mozilla::intl::BidiEmbeddingLevel aLevelBefore,
mozilla::intl::BidiEmbeddingLevel aLevelAfter) {
mFrameBefore = aFrameBefore;
mFrameAfter = aFrameAfter;
mLevelBefore = aLevelBefore;
mLevelAfter = aLevelAfter;
}
nsIFrame* mFrameBefore;
nsIFrame* mFrameAfter;
mozilla::intl::BidiEmbeddingLevel mLevelBefore;
mozilla::intl::BidiEmbeddingLevel mLevelAfter;
};
namespace mozilla {
class SelectionChangeEventDispatcher;
namespace dom {
class Highlight;
class Selection;
enum class ClickSelectionType { NotApplicable, Double, Triple };
} // namespace dom
/**
* Constants for places that want to handle table selections. These
* indicate what part of a table is being selected.
*/
enum class TableSelectionMode : uint32_t {
None, /* Nothing being selected; not valid in all cases. */
Cell, /* A cell is being selected. */
Row, /* A row is being selected. */
Column, /* A column is being selected. */
Table, /* A table (including cells and captions) is being selected. */
AllCells, /* All the cells in a table are being selected. */
};
} // namespace mozilla
class nsFrameSelection final {
public:
using CaretAssociationHint = mozilla::CaretAssociationHint;
/*interfaces for addref and release and queryinterface*/
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(nsFrameSelection)
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(nsFrameSelection)
enum class FocusMode {
kExtendSelection, /** Keep old anchor point. */
kCollapseToNewPoint, /** Collapses the Selection to the new point. */
kMultiRangeSelection, /** Keeps existing non-collapsed ranges and marks them
as generated. */
};
/**
* HandleClick will take the focus to the new frame at the new offset and
* will either extend the selection from the old anchor, or replace the old
* anchor. the old anchor and focus position may also be used to deselect
* things
*
* @param aNewfocus is the content that wants the focus
*
* @param aContentOffset is the content offset of the parent aNewFocus
*
* @param aContentOffsetEnd is the content offset of the parent aNewFocus and
* is specified different when you need to select to and include both start
* and end points
*
* @param aHint will tell the selection which direction geometrically to
* actually show the caret on. 1 = end of this line 0 = beginning of this line
*/
MOZ_CAN_RUN_SCRIPT nsresult HandleClick(nsIContent* aNewFocus,
uint32_t aContentOffset,
uint32_t aContentEndOffset,
FocusMode aFocusMode,
CaretAssociationHint aHint);
public:
/**
* Sets the type of the selection based on whether a selection is created
* by doubleclick, long tapping a word or tripleclick.
*
* @param aClickSelectionType ClickSelectionType::Double if the selection
* is created by doubleclick,
* ClickSelectionType::Triple if the selection
* is created by tripleclick.
*/
void SetClickSelectionType(
mozilla::dom::ClickSelectionType aClickSelectionType) {
mClickSelectionType = aClickSelectionType;
}
/**
* Returns true if the selection was created by doubleclick or
* long tap over a word.
*/
[[nodiscard]] bool IsDoubleClickSelection() const {
return mClickSelectionType == mozilla::dom::ClickSelectionType::Double;
}
/**
* Returns true if the selection was created by triple click
*/
[[nodiscard]] bool IsTripleClickSelection() const {
return mClickSelectionType == mozilla::dom::ClickSelectionType::Triple;
}
/**
* HandleDrag extends the selection to contain the frame closest to aPoint.
*
* @param aPresContext is the context to use when figuring out what frame
* contains the point.
*
* @param aFrame is the parent of all frames to use when searching for the
* closest frame to the point.
*
* @param aPoint is relative to aFrame
*/
MOZ_CAN_RUN_SCRIPT void HandleDrag(nsIFrame* aFrame, const nsPoint& aPoint);
/**
* HandleTableSelection will set selection to a table, cell, etc
* depending on information contained in aFlags
*
* @param aParentContent is the paretent of either a table or cell that user
* clicked or dragged the mouse in
*
* @param aContentOffset is the offset of the table or cell
*
* @param aTarget indicates what to select
* * TableSelectionMode::Cell
* We should select a cell (content points to the cell)
* * TableSelectionMode::Row
* We should select a row (content points to any cell in row)
* * TableSelectionMode::Column
* We should select a row (content points to any cell in column)
* * TableSelectionMode::Table
* We should select a table (content points to the table)
* * TableSelectionMode::AllCells
* We should select all cells (content points to any cell in table)
*
* @param aMouseEvent passed in so we can get where event occurred
* and what keys are pressed
*/
// TODO: replace with `MOZ_CAN_RUN_SCRIPT`.
[[nodiscard]] MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult
HandleTableSelection(nsINode* aParentContent, int32_t aContentOffset,
mozilla::TableSelectionMode aTarget,
mozilla::WidgetMouseEvent* aMouseEvent);
/**
* Add cell to the selection with `SelectionType::eNormal`.
*
* @param aCell [in] HTML td element.
*/
nsresult SelectCellElement(nsIContent* aCell);
public:
/**
* Remove cells from selection inside of the given cell range.
*
* @param aTable [in] HTML table element
* @param aStartRowIndex [in] row index where the cells range starts
* @param aStartColumnIndex [in] column index where the cells range starts
* @param aEndRowIndex [in] row index where the cells range ends
* @param aEndColumnIndex [in] column index where the cells range ends
*/
// TODO: annotate this with `MOZ_CAN_RUN_SCRIPT` instead.
MOZ_CAN_RUN_SCRIPT_BOUNDARY
nsresult RemoveCellsFromSelection(nsIContent* aTable, int32_t aStartRowIndex,
int32_t aStartColumnIndex,
int32_t aEndRowIndex,
int32_t aEndColumnIndex);
/**
* Remove cells from selection outside of the given cell range.
*
* @param aTable [in] HTML table element
* @param aStartRowIndex [in] row index where the cells range starts
* @param aStartColumnIndex [in] column index where the cells range starts
* @param aEndRowIndex [in] row index where the cells range ends
* @param aEndColumnIndex [in] column index where the cells range ends
*/
// TODO: annotate this with `MOZ_CAN_RUN_SCRIPT` instead.
MOZ_CAN_RUN_SCRIPT_BOUNDARY
nsresult RestrictCellsToSelection(nsIContent* aTable, int32_t aStartRowIndex,
int32_t aStartColumnIndex,
int32_t aEndRowIndex,
int32_t aEndColumnIndex);
/**
* StartAutoScrollTimer is responsible for scrolling frames so that
* aPoint is always visible, and for selecting any frame that contains
* aPoint. The timer will also reset itself to fire again if we have
* not scrolled to the end of the document.
*
* @param aFrame is the outermost frame to use when searching for
* the closest frame for the point, i.e. the frame that is capturing
* the mouse
*
* @param aPoint is relative to aFrame.
*
* @param aDelay is the timer's interval.
*/
MOZ_CAN_RUN_SCRIPT
nsresult StartAutoScrollTimer(nsIFrame* aFrame, const nsPoint& aPoint,
uint32_t aDelay);
/**
* Stops any active auto scroll timer.
*/
void StopAutoScrollTimer();
/**
* Returns in frame coordinates the selection beginning and ending with the
* type of selection given
*
* @param aContent is the content asking
* @param aContentOffset is the starting content boundary
* @param aContentLength is the length of the content piece asking
* @param aSlowCheck will check using slow method with no shortcuts
*/
mozilla::UniquePtr<SelectionDetails> LookUpSelection(nsIContent* aContent,
int32_t aContentOffset,
int32_t aContentLength,
bool aSlowCheck) const;
/**
* Sets the drag state to aState for resons of drag state.
*
* @param aState is the new state of drag
*/
MOZ_CAN_RUN_SCRIPT
void SetDragState(bool aState);
/**
* Gets the drag state to aState for resons of drag state.
*
* @param aState will hold the state of drag
*/
bool GetDragState() const { return mDragState; }
/**
* If we are in table cell selection mode. aka ctrl click in table cell
*/
bool IsInTableSelectionMode() const {
return mTableSelection.mMode != mozilla::TableSelectionMode::None;
}
void ClearTableCellSelection() {
mTableSelection.mMode = mozilla::TableSelectionMode::None;
}
/**
* No query interface for selection. must use this method now.
*
* @param aSelectionType The selection type what you want.
*/
mozilla::dom::Selection* GetSelection(
mozilla::SelectionType aSelectionType) const;
/**
* @brief Adds a highlight selection for `aHighlight`.
*/
MOZ_CAN_RUN_SCRIPT void AddHighlightSelection(
nsAtom* aHighlightName, mozilla::dom::Highlight& aHighlight);
/**
* @brief Removes the Highlight selection identified by `aHighlightName`.
*/
MOZ_CAN_RUN_SCRIPT void RemoveHighlightSelection(nsAtom* aHighlightName);
/**
* @brief Adds a new range to the highlight selection.
*
* If there is no highlight selection for the given highlight yet, it is
* created using |AddHighlightSelection|.
*/
MOZ_CAN_RUN_SCRIPT void AddHighlightSelectionRange(
nsAtom* aHighlightName, mozilla::dom::Highlight& aHighlight,
mozilla::dom::AbstractRange& aRange);
/**
* @brief Removes a range from a highlight selection.
*/
MOZ_CAN_RUN_SCRIPT void RemoveHighlightSelectionRange(
nsAtom* aHighlightName, mozilla::dom::AbstractRange& aRange);
/**
* ScrollSelectionIntoView scrolls a region of the selection,
* so that it is visible in the scrolled view.
*
* @param aSelectionType the selection to scroll into view.
*
* @param aRegion the region inside the selection to scroll into view.
*
* @param aFlags the scroll flags. Valid bits include:
* * SCROLL_SYNCHRONOUS: when set, scrolls the selection into view
* before returning. If not set, posts a request which is processed
* at some point after the method returns.
* * SCROLL_FIRST_ANCESTOR_ONLY: if set, only the first ancestor will be
* scrolled into view.
*/
// TODO: replace with `MOZ_CAN_RUN_SCRIPT`.
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult
ScrollSelectionIntoView(mozilla::SelectionType aSelectionType,
SelectionRegion aRegion, int16_t aFlags) const;
/**
* RepaintSelection repaints the selected frames that are inside the
* selection specified by aSelectionType.
*
* @param aSelectionType The selection type what you want to repaint.
*/
nsresult RepaintSelection(mozilla::SelectionType aSelectionType);
bool IsValidSelectionPoint(nsINode* aNode) const;
/**
* GetFrameToPageSelect() returns a frame which is ancestor limit of
* per-page selection. The frame may not be scrollable. E.g.,
* when selection ancestor limit is set to a frame of an editing host of
* contenteditable element and it's not scrollable.
*/
nsIFrame* GetFrameToPageSelect() const;
/**
* This method moves caret (if aExtend is false) or expands selection (if
* aExtend is true). Then, scrolls aFrame one page. Finally, this may
* call ScrollSelectionIntoView() for making focus of selection visible
* but depending on aSelectionIntoView value.
*
* @param aForward if true, scroll forward if not scroll backward
* @param aExtend if true, extend selection to the new point
* @param aFrame the frame to scroll or container of per-page selection.
* if aExtend is true and selection may have ancestor limit,
* should set result of GetFrameToPageSelect().
* @param aSelectionIntoView
* If IfChanged, this makes selection into view only when
* selection is modified by the call.
* If Yes, this makes selection into view always.
*/
enum class SelectionIntoView { IfChanged, Yes };
MOZ_CAN_RUN_SCRIPT nsresult PageMove(bool aForward, bool aExtend,
nsIFrame* aFrame,
SelectionIntoView aSelectionIntoView);
void SetHint(CaretAssociationHint aHintRight) { mCaret.mHint = aHintRight; }
CaretAssociationHint GetHint() const { return mCaret.mHint; }
void SetCaretBidiLevelAndMaybeSchedulePaint(
mozilla::intl::BidiEmbeddingLevel aLevel);
/**
* GetCaretBidiLevel gets the caret bidi level.
*/
mozilla::intl::BidiEmbeddingLevel GetCaretBidiLevel() const;
/**
* UndefineCaretBidiLevel sets the caret bidi level to "undefined".
*/
void UndefineCaretBidiLevel();
/**
* PhysicalMove will generally be called from the nsiselectioncontroller
* implementations. the effect being the selection will move one unit
* 'aAmount' in the given aDirection.
* @param aDirection the direction to move the selection
* @param aAmount amount of movement (char/line; word/page; eol/doc)
* @param aExtend continue selection
*/
// TODO: replace with `MOZ_CAN_RUN_SCRIPT`.
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult PhysicalMove(int16_t aDirection,
int16_t aAmount,
bool aExtend);
/**
* CharacterMove will generally be called from the nsiselectioncontroller
* implementations. the effect being the selection will move one character
* left or right.
* @param aForward move forward in document.
* @param aExtend continue selection
*/
// TODO: replace with `MOZ_CAN_RUN_SCRIPT`.
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult CharacterMove(bool aForward,
bool aExtend);
/**
* WordMove will generally be called from the nsiselectioncontroller
* implementations. the effect being the selection will move one word left or
* right.
* @param aForward move forward in document.
* @param aExtend continue selection
*/
// TODO: replace with `MOZ_CAN_RUN_SCRIPT`.
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult WordMove(bool aForward, bool aExtend);
/**
* LineMove will generally be called from the nsiselectioncontroller
* implementations. the effect being the selection will move one line up or
* down.
* @param aForward move forward in document.
* @param aExtend continue selection
*/
// TODO: replace with `MOZ_CAN_RUN_SCRIPT`.
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult LineMove(bool aForward, bool aExtend);
/**
* IntraLineMove will generally be called from the nsiselectioncontroller
* implementations. the effect being the selection will move to beginning or
* end of line
* @param aForward move forward in document.
* @param aExtend continue selection
*/
// TODO: replace with `MOZ_CAN_RUN_SCRIPT`.
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult IntraLineMove(bool aForward,
bool aExtend);
/**
* CreateRangeExtendedToNextGraphemeClusterBoundary() returns range which is
* extended from normal selection range to start of next grapheme cluster
* boundary.
*/
template <typename RangeType>
MOZ_CAN_RUN_SCRIPT mozilla::Result<RefPtr<RangeType>, nsresult>
CreateRangeExtendedToNextGraphemeClusterBoundary() {
return CreateRangeExtendedToSomewhere<RangeType>(eDirNext, eSelectCluster,
eLogical);
}
/**
* CreateRangeExtendedToPreviousCharacterBoundary() returns range which is
* extended from normal selection range to start of previous character
* boundary.
*/
template <typename RangeType>
MOZ_CAN_RUN_SCRIPT mozilla::Result<RefPtr<RangeType>, nsresult>
CreateRangeExtendedToPreviousCharacterBoundary() {
return CreateRangeExtendedToSomewhere<RangeType>(
eDirPrevious, eSelectCharacter, eLogical);
}
/**
* CreateRangeExtendedToNextWordBoundary() returns range which is
* extended from normal selection range to start of next word boundary.
*/
template <typename RangeType>
MOZ_CAN_RUN_SCRIPT mozilla::Result<RefPtr<RangeType>, nsresult>
CreateRangeExtendedToNextWordBoundary() {
return CreateRangeExtendedToSomewhere<RangeType>(eDirNext, eSelectWord,
eLogical);
}
/**
* CreateRangeExtendedToPreviousWordBoundary() returns range which is
* extended from normal selection range to start of previous word boundary.
*/
template <typename RangeType>
MOZ_CAN_RUN_SCRIPT mozilla::Result<RefPtr<RangeType>, nsresult>
CreateRangeExtendedToPreviousWordBoundary() {
return CreateRangeExtendedToSomewhere<RangeType>(eDirPrevious, eSelectWord,
eLogical);
}
/**
* CreateRangeExtendedToPreviousHardLineBreak() returns range which is
* extended from normal selection range to previous hard line break.
*/
template <typename RangeType>
MOZ_CAN_RUN_SCRIPT mozilla::Result<RefPtr<RangeType>, nsresult>
CreateRangeExtendedToPreviousHardLineBreak() {
return CreateRangeExtendedToSomewhere<RangeType>(
eDirPrevious, eSelectBeginLine, eLogical);
}
/**
* CreateRangeExtendedToNextHardLineBreak() returns range which is extended
* from normal selection range to next hard line break.
*/
template <typename RangeType>
MOZ_CAN_RUN_SCRIPT mozilla::Result<RefPtr<RangeType>, nsresult>
CreateRangeExtendedToNextHardLineBreak() {
return CreateRangeExtendedToSomewhere<RangeType>(eDirNext, eSelectEndLine,
eLogical);
}
/** Sets/Gets The display selection enum.
*/
void SetDisplaySelection(int16_t aState) { mDisplaySelection = aState; }
int16_t GetDisplaySelection() const { return mDisplaySelection; }
/**
* This method can be used to store the data received during a MouseDown
* event so that we can place the caret during the MouseUp event.
*
* @param aMouseEvent the event received by the selection MouseDown
* handling method. A nullptr value can be use to tell this method
* that any data is storing is no longer valid.
*/
void SetDelayedCaretData(mozilla::WidgetMouseEvent* aMouseEvent);
/**
* Get the delayed MouseDown event data necessary to place the
* caret during MouseUp processing.
*
* @return a pointer to the event received
* by the selection during MouseDown processing. It can be nullptr
* if the data is no longer valid.
*/
bool HasDelayedCaretData() const { return mDelayedMouseEvent.mIsValid; }
bool IsShiftDownInDelayedCaretData() const {
NS_ASSERTION(mDelayedMouseEvent.mIsValid, "No valid delayed caret data");
return mDelayedMouseEvent.mIsShift;
}
uint32_t GetClickCountInDelayedCaretData() const {
NS_ASSERTION(mDelayedMouseEvent.mIsValid, "No valid delayed caret data");
return mDelayedMouseEvent.mClickCount;
}
bool MouseDownRecorded() const {
return !GetDragState() && HasDelayedCaretData() &&
GetClickCountInDelayedCaretData() < 2;
}
/**
* Get the content node that limits the selection
*
* When searching up a nodes for parents, as in a text edit field
* in an browser page, we must stop at this node else we reach into the
* parent page, which is very bad!
*/
nsIContent* GetLimiter() const { return mLimiters.mLimiter; }
nsIContent* GetAncestorLimiter() const { return mLimiters.mAncestorLimiter; }
MOZ_CAN_RUN_SCRIPT_BOUNDARY void SetAncestorLimiter(nsIContent* aLimiter);
/**
* GetPrevNextBidiLevels will return the frames and associated Bidi levels of
* the characters logically before and after a (collapsed) selection.
*
* @param aNode is the node containing the selection
* @param aContentOffset is the offset of the selection in the node
* @param aJumpLines
* If true, look across line boundaries.
* If false, behave as if there were base-level frames at line edges.
*
* @return A struct holding the before/after frame and the before/after
* level.
*
* At the beginning and end of each line there is assumed to be a frame with
* Bidi level equal to the paragraph embedding level.
*
* In these cases the before frame and after frame respectively will be
* nullptr.
*/
nsPrevNextBidiLevels GetPrevNextBidiLevels(nsIContent* aNode,
uint32_t aContentOffset,
bool aJumpLines) const;
/**
* MaintainSelection will track the normal selection as being "sticky".
* Dragging or extending selection will never allow for a subset
* (or the whole) of the maintained selection to become unselected.
* Primary use: double click selecting then dragging on second click
*
* @param aAmount the initial amount of text selected (word, line or
* paragraph). For "line", use eSelectBeginLine.
*/
nsresult MaintainSelection(nsSelectionAmount aAmount = eSelectNoAmount);
MOZ_CAN_RUN_SCRIPT nsresult ConstrainFrameAndPointToAnchorSubtree(
nsIFrame* aFrame, const nsPoint& aPoint, nsIFrame** aRetFrame,
nsPoint& aRetPoint) const;
/**
* @param aPresShell is the parameter to be used for most of the other calls
* for callbacks etc
*
* @param aLimiter limits the selection to nodes with aLimiter parents
*
* @param aAccessibleCaretEnabled true if we should enable the accessible
* caret.
*/
nsFrameSelection(mozilla::PresShell* aPresShell, nsIContent* aLimiter,
bool aAccessibleCaretEnabled);
/**
* @param aRequesterFuncName function name which wants to start the batch.
* This won't be stored nor exposed to selection listeners etc, used only for
* logging.
*/
void StartBatchChanges(const char* aRequesterFuncName);
/**
* @param aRequesterFuncName function name which wants to end the batch.
* This won't be stored nor exposed to selection listeners etc, used only for
* logging.
* @param aReasons potentially multiple of the reasons defined in
* nsISelectionListener.idl
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY void EndBatchChanges(
const char* aRequesterFuncName,
int16_t aReasons = nsISelectionListener::NO_REASON);
mozilla::PresShell* GetPresShell() const { return mPresShell; }
void DisconnectFromPresShell();
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult ClearNormalSelection();
// Table selection support.
static nsITableCellLayout* GetCellLayout(const nsIContent* aCellContent);
private:
~nsFrameSelection();
// TODO: in case an error is returned, it sometimes refers to a programming
// error, in other cases to runtime errors. This deserves to be cleaned up.
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult
TakeFocus(nsIContent& aNewFocus, uint32_t aContentOffset,
uint32_t aContentEndOffset, CaretAssociationHint aHint,
FocusMode aFocusMode);
/**
* After moving the caret, its Bidi level is set according to the following
* rules:
*
* After moving over a character with left/right arrow, set to the Bidi level
* of the last moved over character. After Home and End, set to the paragraph
* embedding level. After up/down arrow, PageUp/Down, set to the lower level
* of the 2 surrounding characters. After mouse click, set to the level of the
* current frame.
*
* The following two methods use GetPrevNextBidiLevels to determine the new
* Bidi level. BidiLevelFromMove is called when the caret is moved in response
* to a keyboard event
*
* @param aPresShell is the presentation shell
* @param aNode is the content node
* @param aContentOffset is the new caret position, as an offset into aNode
* @param aAmount is the amount of the move that gave the caret its new
* position
* @param aHint is the hint indicating in what logical direction the caret
* moved
*/
void BidiLevelFromMove(mozilla::PresShell* aPresShell, nsIContent* aNode,
uint32_t aContentOffset, nsSelectionAmount aAmount,
CaretAssociationHint aHint);
/**
* BidiLevelFromClick is called when the caret is repositioned by clicking the
* mouse
*
* @param aNode is the content node
* @param aContentOffset is the new caret position, as an offset into aNode
*/
void BidiLevelFromClick(nsIContent* aNewFocus, uint32_t aContentOffset);
/**
* @param aReasons potentially multiple of the reasons defined in
* nsISelectionListener.idl.
*/
void SetChangeReasons(int16_t aReasons) {
mSelectionChangeReasons = aReasons;
}
/**
* @param aReasons potentially multiple of the reasons defined in
* nsISelectionListener.idl.
*/
void AddChangeReasons(int16_t aReasons) {
mSelectionChangeReasons |= aReasons;
}
/**
* @return potentially multiple of the reasons defined in
* nsISelectionListener.idl.
*/
int16_t PopChangeReasons() {
int16_t retval = mSelectionChangeReasons;
mSelectionChangeReasons = nsISelectionListener::NO_REASON;
return retval;
}
nsSelectionAmount GetCaretMoveAmount() { return mCaretMoveAmount; }
bool IsUserSelectionReason() const {
return (mSelectionChangeReasons &
(nsISelectionListener::DRAG_REASON |
nsISelectionListener::MOUSEDOWN_REASON |
nsISelectionListener::MOUSEUP_REASON |
nsISelectionListener::KEYPRESS_REASON)) !=
nsISelectionListener::NO_REASON;
}
friend class mozilla::dom::Selection;
friend class mozilla::SelectionChangeEventDispatcher;
friend struct mozilla::AutoPrepareFocusRange;
/*HELPER METHODS*/
// Whether MoveCaret should use logical or visual movement,
// or follow the bidi.edit.caret_movement_style preference.
enum CaretMovementStyle { eLogical, eVisual, eUsePrefStyle };
MOZ_CAN_RUN_SCRIPT nsresult MoveCaret(nsDirection aDirection,
bool aContinueSelection,
nsSelectionAmount aAmount,
CaretMovementStyle aMovementStyle);
/**
* PeekOffsetForCaretMove() only peek offset for caret move from the focus
* point of the normal selection. I.e., won't change selection ranges nor
* bidi information.
*/
mozilla::Result<mozilla::PeekOffsetStruct, nsresult> PeekOffsetForCaretMove(
nsDirection aDirection, bool aContinueSelection,
const nsSelectionAmount aAmount, CaretMovementStyle aMovementStyle,
const nsPoint& aDesiredCaretPos) const;
/**
* CreateRangeExtendedToSomewhere() is common method to implement
* CreateRangeExtendedTo*(). This method creates a range extended from
* normal selection range.
*/
template <typename RangeType>
MOZ_CAN_RUN_SCRIPT mozilla::Result<RefPtr<RangeType>, nsresult>
CreateRangeExtendedToSomewhere(nsDirection aDirection,
const nsSelectionAmount aAmount,
CaretMovementStyle aMovementStyle);
void InvalidateDesiredCaretPos(); // do not listen to mDesiredCaretPos.mValue
// you must get another.
bool IsBatching() const { return mBatching.mCounter > 0; }
enum class IsBatchingEnd : bool { No, Yes };
// nsFrameSelection may get deleted when calling this,
// so remember to use nsCOMPtr when needed.
MOZ_CAN_RUN_SCRIPT
nsresult NotifySelectionListeners(
mozilla::SelectionType aSelectionType,
IsBatchingEnd aEndBatching = IsBatchingEnd::No);
static nsresult GetCellIndexes(const nsIContent* aCell, int32_t& aRowIndex,
int32_t& aColIndex);
static nsIContent* GetFirstCellNodeInRange(const nsRange* aRange);
// Returns non-null table if in same table, null otherwise
static nsIContent* IsInSameTable(const nsIContent* aContent1,
const nsIContent* aContent2);
// Might return null
static nsIContent* GetParentTable(const nsIContent* aCellNode);
////////////BEGIN nsFrameSelection members
RefPtr<mozilla::dom::Selection>
mDomSelections[sizeof(mozilla::kPresentSelectionTypes) /
sizeof(mozilla::SelectionType)];
nsTArray<
mozilla::CompactPair<RefPtr<nsAtom>, RefPtr<mozilla::dom::Selection>>>
mHighlightSelections;
struct TableSelection {
// Get our first range, if its first selected node is a cell. If this does
// not return null, then the first node in the returned range is a cell
// (according to GetFirstCellNodeInRange).
nsRange* GetFirstCellRange(const mozilla::dom::Selection& aNormalSelection);
// Get our next range, if its first selected node is a cell. If this does
// not return null, then the first node in the returned range is a cell
// (according to GetFirstCellNodeInRange).
nsRange* GetNextCellRange(const mozilla::dom::Selection& aNormalSelection);
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult
HandleSelection(nsINode* aParentContent, int32_t aContentOffset,
mozilla::TableSelectionMode aTarget,
mozilla::WidgetMouseEvent* aMouseEvent, bool aDragState,
mozilla::dom::Selection& aNormalSelection);
/**
* @return the closest inclusive table cell ancestor
* (https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor) of
* aContent, if it is actively editable.
*/
static nsINode* IsContentInActivelyEditableTableCell(
nsPresContext* aContext, nsIContent* aContent);
// TODO: annotate this with `MOZ_CAN_RUN_SCRIPT` instead.
MOZ_CAN_RUN_SCRIPT_BOUNDARY
nsresult SelectBlockOfCells(nsIContent* aStartCell, nsIContent* aEndCell,
mozilla::dom::Selection& aNormalSelection);
nsresult SelectRowOrColumn(nsIContent* aCellContent,
mozilla::dom::Selection& aNormalSelection);
MOZ_CAN_RUN_SCRIPT nsresult
UnselectCells(const nsIContent* aTable, int32_t aStartRowIndex,
int32_t aStartColumnIndex, int32_t aEndRowIndex,
int32_t aEndColumnIndex, bool aRemoveOutsideOfCellRange,
mozilla::dom::Selection& aNormalSelection);
nsCOMPtr<nsINode>
mClosestInclusiveTableCellAncestor; // used to snap to table selection
nsCOMPtr<nsIContent> mStartSelectedCell;
nsCOMPtr<nsIContent> mEndSelectedCell;
nsCOMPtr<nsIContent> mAppendStartSelectedCell;
nsCOMPtr<nsIContent> mUnselectCellOnMouseUp;
mozilla::TableSelectionMode mMode = mozilla::TableSelectionMode::None;
int32_t mSelectedCellIndex = 0;
bool mDragSelectingCells = false;
private:
struct MOZ_STACK_CLASS FirstAndLastCell {
nsCOMPtr<nsIContent> mFirst;
nsCOMPtr<nsIContent> mLast;
};
mozilla::Result<FirstAndLastCell, nsresult>
FindFirstAndLastCellOfRowOrColumn(const nsIContent& aCellContent) const;
[[nodiscard]] MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult HandleDragSelecting(
mozilla::TableSelectionMode aTarget, nsIContent* aChildContent,
const mozilla::WidgetMouseEvent* aMouseEvent,
mozilla::dom::Selection& aNormalSelection);
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult HandleMouseUpOrDown(
mozilla::TableSelectionMode aTarget, bool aDragState,
nsIContent* aChildContent, nsINode* aParentContent,
int32_t aContentOffset, const mozilla::WidgetMouseEvent* aMouseEvent,
mozilla::dom::Selection& aNormalSelection);
class MOZ_STACK_CLASS RowAndColumnRelation;
};
TableSelection mTableSelection;
struct MaintainedRange {
/**
* Ensure anchor and focus of aNormalSelection are ordered appropriately
* relative to the maintained range.
*/
MOZ_CAN_RUN_SCRIPT void AdjustNormalSelection(
const nsIContent* aContent, int32_t aOffset,
mozilla::dom::Selection& aNormalSelection) const;
/**
* @param aStopAtScroller If yes, this will
* set `PeekOffsetOption::StopAtScroller`.
*/
enum class StopAtScroller : bool { No, Yes };
void AdjustContentOffsets(nsIFrame::ContentOffsets& aOffsets,
StopAtScroller aStopAtScroller) const;
void MaintainAnchorFocusRange(
const mozilla::dom::Selection& aNormalSelection,
nsSelectionAmount aAmount);
RefPtr<nsRange> mRange;
nsSelectionAmount mAmount = eSelectNoAmount;
};
MaintainedRange mMaintainedRange;
struct Batching {
uint32_t mCounter = 0;
};
Batching mBatching;
struct Limiters {
// Limit selection navigation to a child of this node.
nsCOMPtr<nsIContent> mLimiter;
// Limit selection navigation to a descendant of this node.
nsCOMPtr<nsIContent> mAncestorLimiter;
};
Limiters mLimiters;
mozilla::PresShell* mPresShell = nullptr;
// Reasons for notifications of selection changing.
// Can be multiple of the reasons defined in nsISelectionListener.idl.
int16_t mSelectionChangeReasons = nsISelectionListener::NO_REASON;
// For visual display purposes.
int16_t mDisplaySelection = nsISelectionController::SELECTION_OFF;
nsSelectionAmount mCaretMoveAmount = eSelectNoAmount;
struct Caret {
// Hint to tell if the selection is at the end of this line or beginning of
// next.
CaretAssociationHint mHint = CaretAssociationHint::Before;
mozilla::intl::BidiEmbeddingLevel mBidiLevel = BIDI_LEVEL_UNDEFINED;
bool IsVisualMovement(bool aContinueSelection,
CaretMovementStyle aMovementStyle) const;
};
Caret mCaret;
mozilla::intl::BidiEmbeddingLevel mKbdBidiLevel =
mozilla::intl::BidiEmbeddingLevel::LTR();
class DesiredCaretPos {
public:
// the position requested by the Key Handling for up down
nsresult FetchPos(nsPoint& aDesiredCaretPos,
const mozilla::PresShell& aPresShell,
mozilla::dom::Selection& aNormalSelection) const;
void Set(const nsPoint& aPos);
void Invalidate();
bool mIsSet = false;
private:
nsPoint mValue;
};
DesiredCaretPos mDesiredCaretPos;
struct DelayedMouseEvent {
bool mIsValid = false;
// These values are not used since they are only valid when mIsValid is
// true, and setting mIsValid always overrides these values.
bool mIsShift = false;
uint32_t mClickCount = 0;
};
DelayedMouseEvent mDelayedMouseEvent;
bool mDragState = false; // for drag purposes
bool mAccessibleCaretEnabled = false;
// Records if a selection was created by doubleclicking or tripleclicking
// a word. This information is needed later on to determine if a leading
// or trailing whitespace needs to be removed as well to achieve
// native behaviour on macOS.
mozilla::dom::ClickSelectionType mClickSelectionType =
mozilla::dom::ClickSelectionType::NotApplicable;
};
/**
* Selection Batcher class that supports multiple FrameSelections.
*/
class MOZ_STACK_CLASS AutoFrameSelectionBatcher {
public:
explicit AutoFrameSelectionBatcher(const char* aFunctionName,
size_t aEstimatedSize = 1)
: mFunctionName(aFunctionName) {
mFrameSelections.SetCapacity(aEstimatedSize);
}
~AutoFrameSelectionBatcher() {
for (const auto& frameSelection : mFrameSelections) {
frameSelection->EndBatchChanges(mFunctionName);
}
}
void AddFrameSelection(nsFrameSelection* aFrameSelection) {
if (!aFrameSelection) {
return;
}
aFrameSelection->StartBatchChanges(mFunctionName);
mFrameSelections.AppendElement(aFrameSelection);
}
private:
const char* mFunctionName;
AutoTArray<RefPtr<nsFrameSelection>, 1> mFrameSelections;
};
#endif /* nsFrameSelection_h___ */
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