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gecko-dev/layout/generic/nsFrameSelection.h

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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 "mozilla/intl/BidiEmbeddingLevel.h"
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.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 "CaretAssociationHint.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::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;
} // namespace mozilla
/** 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.
*/
struct MOZ_STACK_CLASS nsPeekOffsetStruct {
enum class ForceEditableRegion {
No,
Yes,
};
nsPeekOffsetStruct(
nsSelectionAmount aAmount, nsDirection aDirection, int32_t aStartOffset,
nsPoint aDesiredCaretPos, bool aJumpLines, bool aScrollViewStop,
bool aIsKeyboardSelect, bool aVisual, bool aExtend,
ForceEditableRegion = ForceEditableRegion::No,
mozilla::EWordMovementType aWordMovementType = mozilla::eDefaultBehavior,
bool aTrimSpaces = true);
// 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 beahvior, which is a combination of direction and the
// platform-based pref "layout.word_select.eat_space_to_next_word"
mozilla::EWordMovementType mWordMovementType;
// Whether to allow jumping across line boundaries.
//
// Used with: eSelectCharacter, eSelectWord.
const bool mJumpLines;
// mTrimSpaces: Whether we should trim spaces at begin/end of content
const bool mTrimSpaces;
// Whether to stop when reaching a scroll view boundary.
//
// Used with: eSelectCharacter, eSelectWord, eSelectLine.
const bool mScrollViewStop;
// Whether the peeking is done in response to a keyboard action.
//
// Used with: eSelectWord.
const bool mIsKeyboardSelect;
// Whether bidi caret behavior is visual (true) or logical (false).
//
// Used with: eSelectCharacter, eSelectWord, eSelectBeginLine, eSelectEndLine.
const bool mVisual;
// Whether the selection is being extended or moved.
const bool mExtend;
// If true, the offset has to end up in an editable node, otherwise we'll keep
// searching.
const bool mForceEditableRegion;
/*** 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.
mozilla::CaretAssociationHint mAttach;
};
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 Selection;
} // 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 nsIScrollableFrame;
class nsFrameSelection final {
public:
typedef mozilla::CaretAssociationHint CaretAssociateHint;
/*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,
CaretAssociateHint aHint);
public:
/**
* Sets flag to true if a selection is created by doubleclick or
* long tapping a word.
*
* @param aIsDoubleClickSelection True if the selection is created by
* doubleclick or long tap over a word.
*/
void SetIsDoubleClickSelection(bool aIsDoubleClickSelection) {
mIsDoubleClickSelection = aIsDoubleClickSelection;
}
/**
* Returns true if the selection was created by doubleclick or
* long tap over a word.
*/
[[nodiscard]] bool IsDoubleClickSelection() const {
return mIsDoubleClickSelection;
}
/**
* 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;
/**
* 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;
static bool AdjustFrameForLineStart(nsIFrame*& aFrame, int32_t& aFrameOffset);
/**
* Given a node and its child offset, return the nsIFrame and the offset into
* that frame.
*
* @param aNode input parameter for the node to look at
* TODO: Make this `const nsIContent*` for `ContentEventHandler`.
* @param aOffset offset into above node.
* @param aReturnOffset will contain offset into frame.
*/
static nsIFrame* GetFrameForNodeOffset(nsIContent* aNode, int32_t aOffset,
CaretAssociateHint aHint,
int32_t* aReturnOffset);
/**
* 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(CaretAssociateHint aHintRight) { mCaret.mHint = aHintRight; }
CaretAssociateHint 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;
/**
* GetFrameFromLevel will scan in a given direction
* until it finds a frame with a Bidi level less than or equal to a given
* level. It will return the last frame before this.
*
* @param aPresContext is the context to use
* @param aFrameIn is the frame to start from
* @param aDirection is the direction to scan
* @param aBidiLevel is the level to search for
* @param aFrameOut will hold the frame returned
*/
nsresult GetFrameFromLevel(nsIFrame* aFrameIn, nsDirection aDirection,
mozilla::intl::BidiEmbeddingLevel aBidiLevel,
nsIFrame** aFrameOut) 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, CaretAssociateHint 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,
CaretAssociateHint 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);
static nsPrevNextBidiLevels GetPrevNextBidiLevels(nsIContent* aNode,
uint32_t aContentOffset,
CaretAssociateHint aHint,
bool aJumpLines);
/**
* @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. I.e., won't
* change selection ranges nor bidi information.
*/
mozilla::Result<nsPeekOffsetStruct, 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);
/**
* IsIntraLineCaretMove() is a helper method for PeekOffsetForCaretMove()
* and CreateRangeExtendedToSomwhereFromNormalSelection(). This returns
* whether aAmount is intra line move or is crossing hard line break.
* This returns error if aMount is not supported by the methods.
*/
static mozilla::Result<bool, nsresult> IsIntraLineCaretMove(
nsSelectionAmount aAmount) {
switch (aAmount) {
case eSelectCharacter:
case eSelectCluster:
case eSelectWord:
case eSelectWordNoSpace:
case eSelectBeginLine:
case eSelectEndLine:
return true;
case eSelectLine:
return false;
default:
return mozilla::Err(NS_ERROR_FAILURE);
}
}
void InvalidateDesiredCaretPos(); // do not listen to mDesiredCaretPos.mValue
// you must get another.
bool IsBatching() const { return mBatching.mCounter > 0; }
void SetChangesDuringBatchingFlag() {
MOZ_ASSERT(mBatching.mCounter > 0);
mBatching.mChangesDuringBatching = true;
}
// nsFrameSelection may get deleted when calling this,
// so remember to use nsCOMPtr when needed.
MOZ_CAN_RUN_SCRIPT
nsresult NotifySelectionListeners(mozilla::SelectionType aSelectionType);
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)];
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 aScrollViewStop see `nsPeekOffsetStruct::mScrollViewStop`.
*/
void AdjustContentOffsets(nsIFrame::ContentOffsets& aOffsets,
bool aScrollViewStop) const;
void MaintainAnchorFocusRange(
const mozilla::dom::Selection& aNormalSelection,
nsSelectionAmount aAmount);
RefPtr<nsRange> mRange;
nsSelectionAmount mAmount = eSelectNoAmount;
};
MaintainedRange mMaintainedRange;
struct Batching {
uint32_t mCounter = 0;
bool mChangesDuringBatching = false;
};
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.
CaretAssociateHint mHint = mozilla::CARET_ASSOCIATE_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 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.
bool mIsDoubleClickSelection{false};
};
#endif /* nsFrameSelection_h___ */
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