/* * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifndef nsFrameSelection_h___ #define nsFrameSelection_h___ #include "nsIFrame.h" #include "nsIContent.h" #include "nsISelectionController.h" #include "nsITableLayout.h" #include "nsITableCellLayout.h" #include "nsIDOMElement.h" #include "nsGUIEvent.h" // IID for the nsFrameSelection interface // cdfa6280-eba6-4938-9406-427818da8ce3 #define NS_FRAME_SELECTION_IID \ { 0xcdfa6280, 0xeba6, 0x4938, \ { 0x94, 0x06, 0x42, 0x78, 0x18, 0xda, 0x8c, 0xe3 } } //---------------------------------------------------------------------- // Selection interface struct SelectionDetails { PRInt32 mStart; PRInt32 mEnd; SelectionType mType; SelectionDetails *mNext; }; class nsIPresShell; enum EWordMovementType { eStartWord, eEndWord, eDefaultBehavior }; /** PeekOffsetStruct is used to group various arguments (both input and output) * that are passed to nsFrame::PeekOffset(). See below for the description of * individual arguments. */ struct nsPeekOffsetStruct { void SetData(nsSelectionAmount aAmount, nsDirection aDirection, PRInt32 aStartOffset, nscoord aDesiredX, PRBool aJumpLines, PRBool aScrollViewStop, PRBool aIsKeyboardSelect, PRBool aVisual, EWordMovementType aWordMovementType = eDefaultBehavior) { mAmount = aAmount; mDirection = aDirection; mStartOffset = aStartOffset; mDesiredX = aDesiredX; mJumpLines = aJumpLines; mScrollViewStop = aScrollViewStop; mIsKeyboardSelect = aIsKeyboardSelect; mVisual = aVisual; mWordMovementType = aWordMovementType; mEatingWS = PR_FALSE; } // 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. // mAmount: The type of movement requested (by character, word, line, etc.) nsSelectionAmount mAmount; // mDirection: eDirPrevious or eDirNext. // Used with: eSelectCharacter, eSelectWord, eSelectLine, eSelectParagraph. nsDirection mDirection; // mStartOffset: Offset into the content of the current frame where the peek starts. // Used with: eSelectCharacter, eSelectWord PRInt32 mStartOffset; // mDesiredX: The desired x coordinate for the caret. // Used with: eSelectLine. nscoord mDesiredX; // mJumpLines: Whether to allow jumping across line boundaries. // Used with: eSelectCharacter, eSelectWord. PRBool mJumpLines; // mScrollViewStop: Whether to stop when reaching a scroll view boundary. // Used with: eSelectCharacter, eSelectWord, eSelectLine. PRBool mScrollViewStop; // mIsKeyboardSelect: Whether the peeking is done in response to a keyboard action. // Used with: eSelectWord. PRBool mIsKeyboardSelect; // mVisual: Whether bidi caret behavior is visual (PR_TRUE) or logical (PR_FALSE). // Used with: eSelectCharacter, eSelectWord. PRBool mVisual; // mWordMovementType: 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" EWordMovementType mWordMovementType; /*** Output arguments ***/ // mResultContent: Content reached as a result of the peek. nsCOMPtr mResultContent; // mContentOffset: Offset into content reached as a result of the peek. PRInt32 mContentOffset; // mResultFrame: Frame reached as a result of the peek. // Used with: eSelectCharacter, eSelectWord. nsIFrame *mResultFrame; // mAttachForward: When the result position is between two frames, // indicates which of the two frames the caret should be painted in. // PR_FALSE means "the end of the frame logically before the caret", // PR_TRUE means "the beginning of the frame logically after the caret". // Used with: eSelectLine, eSelectBeginLine, eSelectEndLine. PRBool mAttachForward; /*** Arguments only used internally ***/ // mEatingWS: Used only internally, for recursive calls into PeekOffset. // Shold be PR_FALSE upon initial call to PeekOffset. // Used with: eSelectWord. PRBool mEatingWS; }; struct nsPrevNextBidiLevels { void SetData(nsIFrame* aFrameBefore, nsIFrame* aFrameAfter, PRUint8 aLevelBefore, PRUint8 aLevelAfter) { mFrameBefore = aFrameBefore; mFrameAfter = aFrameAfter; mLevelBefore = aLevelBefore; mLevelAfter = aLevelAfter; } nsIFrame* mFrameBefore; nsIFrame* mFrameAfter; PRUint8 mLevelBefore; PRUint8 mLevelAfter; }; class nsTypedSelection; class nsIScrollableView; class nsFrameSelection : public nsISupports { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_FRAME_SELECTION_IID) enum HINT { HINTLEFT = 0, HINTRIGHT = 1}; //end of this line or beginning of next /*interfaces for addref and release and queryinterface*/ NS_DECL_ISUPPORTS /** Init will initialize the frame selector with the necessary pres shell to * be used by most of the methods * @param aShell 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 */ void Init(nsIPresShell *aShell, nsIContent *aLimiter); /* SetScrollableView sets the scroll view * @param aScrollView is the scroll view for this selection. */ void SetScrollableView(nsIScrollableView *aScrollView) { mScrollView = aScrollView; } /* GetScrollableView gets the current scroll view */ nsIScrollableView* GetScrollableView() { return mScrollView; } /** 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 aContinueSelection is the flag that tells the selection to keep the old anchor point or not. * @param aMultipleSelection will tell the frame selector to replace /or not the old selection. * cannot coexist with aContinueSelection * @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 */ nsresult HandleClick(nsIContent *aNewFocus, PRUint32 aContentOffset, PRUint32 aContentEndOffset, PRBool aContinueSelection, PRBool aMultipleSelection, PRBool aHint); /** 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 */ void HandleDrag(nsIFrame *aFrame, 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 (defined in nsISelectionPrivate.idl/nsISelectionPrivate.h): * TABLESELECTION_CELL We should select a cell (content points to the cell) * TABLESELECTION_ROW We should select a row (content points to any cell in row) * TABLESELECTION_COLUMN We should select a row (content points to any cell in column) * TABLESELECTION_TABLE We should select a table (content points to the table) * TABLESELECTION_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 */ nsresult HandleTableSelection(nsIContent *aParentContent, PRInt32 aContentOffset, PRInt32 aTarget, nsMouseEvent *aMouseEvent); /** StartAutoScrollTimer is responsible for scrolling views 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 aView is view to use when searching for the closest frame to the point, * which is the view that is capturing the mouse * @param aPoint is relative to the view. * @param aDelay is the timer's interval. */ nsresult StartAutoScrollTimer(nsIView *aView, nsPoint aPoint, PRUint32 aDelay); /** StopAutoScrollTimer stops any active auto scroll timer. */ void StopAutoScrollTimer(); /** Lookup Selection * 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 aReturnDetails linkedlist of return values for the selection. * @param aSlowCheck will check using slow method with no shortcuts */ SelectionDetails* LookUpSelection(nsIContent *aContent, PRInt32 aContentOffset, PRInt32 aContentLength, PRBool aSlowCheck); /** SetMouseDownState(PRBool); * sets the mouse state to aState for resons of drag state. * @param aState is the new state of mousedown */ void SetMouseDownState(PRBool aState); /** GetMouseDownState(PRBool *); * gets the mouse state to aState for resons of drag state. * @param aState will hold the state of mousedown */ PRBool GetMouseDownState() { return mMouseDownState; } /** if we are in table cell selection mode. aka ctrl click in table cell */ PRBool GetTableCellSelection() { return mSelectingTableCellMode != 0; } void ClearTableCellSelection(){ mSelectingTableCellMode = 0; } /** GetSelection * no query interface for selection. must use this method now. * @param aSelectionType enum value defined in nsISelection for the seleciton you want. */ nsISelection* GetSelection(SelectionType aType); /** * ScrollSelectionIntoView scrolls a region of the selection, * so that it is visible in the scrolled view. * * @param aType the selection to scroll into view. * @param aRegion the region inside the selection to scroll into view. * @param aIsSynchronous when PR_TRUE, scrolls the selection into view * at some point after the method returns.request which is processed */ nsresult ScrollSelectionIntoView(SelectionType aType, SelectionRegion aRegion, PRBool aIsSynchronous); /** RepaintSelection repaints the selected frames that are inside the selection * specified by aSelectionType. * @param aSelectionType enum value defined in nsISelection for the seleciton you want. */ nsresult RepaintSelection(SelectionType aType); /** GetFrameForNodeOffset 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 * @param aOffset offset into above node. * @param aReturnOffset will contain offset into frame. */ nsIFrame* GetFrameForNodeOffset(nsIContent *aNode, PRInt32 aOffset, HINT aHint, PRInt32 *aReturnOffset); /** * Scrolling then moving caret placement code in common to text areas and * content areas should be located in the implementer * This method will accept the following parameters and perform the scroll * and caret movement. It remains for the caller to call the final * ScrollCaretIntoView if that called wants to be sure the caret is always * visible. * * @param aForward if PR_TRUE, scroll forward if not scroll backward * @param aExtend if PR_TRUE, extend selection to the new point * @param aScrollableView the view that needs the scrolling */ void CommonPageMove(PRBool aForward, PRBool aExtend, nsIScrollableView *aScrollableView); void SetHint(HINT aHintRight) { mHint = aHintRight; } HINT GetHint() { return mHint; } /** 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 */ nsresult CharacterMove(PRBool aForward, PRBool 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 */ nsresult WordMove(PRBool aForward, PRBool 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 */ nsresult LineMove(PRBool aForward, PRBool 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 */ nsresult IntraLineMove(PRBool aForward, PRBool aExtend); /** Select All will generally be called from the nsiselectioncontroller implementations. * it will select the whole doc */ nsresult SelectAll(); /** Sets/Gets The display selection enum. */ void SetDisplaySelection(PRInt16 aState) { mDisplaySelection = aState; } PRInt16 GetDisplaySelection() { return mDisplaySelection; } /** Allow applications to specify how we should place the caret * when the user clicks over an existing selection. A aDelay * value of PR_TRUE means delay clearing the selection and * placing the caret until MouseUp, when the user clicks over * an existing selection. This is especially useful when applications * want to support Drag & Drop of the current selection. A value * of PR_FALSE means place the caret immediately. If the application * never calls this method, the nsIFrameSelection implementation * assumes the default value is PR_TRUE. * @param aDelay PR_TRUE if we should delay caret placement. */ void SetDelayCaretOverExistingSelection(PRBool aDelay); /** Get the current delay caret setting. */ PRBool GetDelayCaretOverExistingSelection() { return mDelayCaretOverExistingSelection; } /** If we are delaying caret placement til MouseUp (see * Set/GetDelayCaretOverExistingSelection()), this method * can be used to store the data received during the MouseDown * so that we can place the caret during the MouseUp event. * @aMouseEvent the event received by the selection MouseDown * handling method. A NULL value can be use to tell this method * that any data is storing is no longer valid. */ void SetDelayedCaretData(nsMouseEvent *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 NULL * if the data is no longer valid. */ nsMouseEvent* GetDelayedCaretData(); /** 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() { return mLimiter; } /** This will tell the frame selection that a double click has been pressed * so it can track abort future drags if inside the same selection * @aDoubleDown has the double click down happened */ void SetMouseDoubleDown(PRBool aDoubleDown) { mMouseDoubleDownState = aDoubleDown; } /** This will return whether the double down flag was set. * @return whether the double down flag was set */ PRBool GetMouseDoubleDown() { return mMouseDoubleDownState; } /** 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 PR_TRUE, look across line boundaries. * If PR_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 * nsnull. * * This method is virtual since it gets called from outside of layout. */ virtual nsPrevNextBidiLevels GetPrevNextBidiLevels(nsIContent *aNode, PRUint32 aContentOffset, PRBool aJumpLines); /** 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, PRUint8 aBidiLevel, nsIFrame **aFrameOut); /** * MaintainSelection will track the current 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); nsFrameSelection(); virtual ~nsFrameSelection(); void StartBatchChanges(); void EndBatchChanges(); nsresult DeleteFromDocument(); nsIPresShell *GetShell() {return mShell;} private: nsresult TakeFocus(nsIContent *aNewFocus, PRUint32 aContentOffset, PRUint32 aContentEndOffset, PRBool aContinueSelection, PRBool aMultipleSelection); void BidiLevelFromMove(nsIPresShell* aPresShell, nsIContent *aNode, PRUint32 aContentOffset, PRUint32 aKeycode, HINT aHint); void BidiLevelFromClick(nsIContent *aNewFocus, PRUint32 aContentOffset); nsPrevNextBidiLevels GetPrevNextBidiLevels(nsIContent *aNode, PRUint32 aContentOffset, HINT aHint, PRBool aJumpLines); #ifdef VISUALSELECTION NS_IMETHOD VisualSelectFrames(nsIFrame* aCurrentFrame, nsPeekOffsetStruct aPos); NS_IMETHOD VisualSequence(nsIFrame* aSelectFrame, nsIFrame* aCurrentFrame, nsPeekOffsetStruct* aPos, PRBool* aNeedVisualSelection); NS_IMETHOD SelectToEdge(nsIFrame *aFrame, nsIContent *aContent, PRInt32 aOffset, PRInt32 aEdge, PRBool aMultipleSelection); NS_IMETHOD SelectLines(nsDirection aSelectionDirection, nsIDOMNode *aAnchorNode, nsIFrame* aAnchorFrame, PRInt32 aAnchorOffset, nsIDOMNode *aCurrentNode, nsIFrame* aCurrentFrame, PRInt32 aCurrentOffset, nsPeekOffsetStruct aPos); #endif // VISUALSELECTION PRBool AdjustForMaintainedSelection(nsIContent *aContent, PRInt32 aOffset); // post and pop reasons for notifications. we may stack these later void PostReason(PRInt16 aReason) { mSelectionChangeReason = aReason; } PRInt16 PopReason() { PRInt16 retval = mSelectionChangeReason; mSelectionChangeReason = 0; return retval; } friend class nsTypedSelection; #ifdef DEBUG void printSelection(); // for debugging #endif /* DEBUG */ void ResizeBuffer(PRUint32 aNewBufSize); /*HELPER METHODS*/ nsresult MoveCaret(PRUint32 aKeycode, PRBool aContinueSelection, nsSelectionAmount aAmount); nsresult FetchDesiredX(nscoord &aDesiredX); //the x position requested by the Key Handling for up down void InvalidateDesiredX(); //do not listen to mDesiredX you must get another. void SetDesiredX(nscoord aX); //set the mDesiredX nsresult GetRootForContentSubtree(nsIContent *aContent, nsIContent **aParent); nsresult ConstrainFrameAndPointToAnchorSubtree(nsIFrame *aFrame, nsPoint& aPoint, nsIFrame **aRetFrame, nsPoint& aRetPoint); PRUint32 GetBatching(){return mBatching;} PRBool GetNotifyFrames(){return mNotifyFrames;} void SetDirty(PRBool aDirty=PR_TRUE){if (mBatching) mChangesDuringBatching = aDirty;} nsresult NotifySelectionListeners(SelectionType aType); // add parameters to say collapsed etc? nsTypedSelection *mDomSelections[nsISelectionController::NUM_SELECTIONTYPES]; // Table selection support. // Interfaces that let us get info based on cellmap locations nsITableLayout* GetTableLayout(nsIContent *aTableContent); nsITableCellLayout* GetCellLayout(nsIContent *aCellContent); nsresult SelectBlockOfCells(nsIContent *aStartNode, nsIContent *aEndNode); nsresult SelectRowOrColumn(nsIContent *aCellContent, PRUint32 aTarget); nsresult GetCellIndexes(nsIContent *aCell, PRInt32 &aRowIndex, PRInt32 &aColIndex); nsresult GetFirstSelectedCellAndRange(nsIDOMNode **aCell, nsIDOMRange **aRange); nsresult GetNextSelectedCellAndRange(nsIDOMNode **aCell, nsIDOMRange **aRange); nsresult GetFirstCellNodeInRange(nsIDOMRange *aRange, nsIDOMNode **aCellNode); // aTableNode may be null if table isn't needed to be returned PRBool IsInSameTable(nsIContent *aContent1, nsIContent *aContent2, nsIContent **aTableNode); nsresult GetParentTable(nsIContent *aCellNode, nsIContent **aTableNode); nsresult SelectCellElement(nsIDOMElement* aCellElement); nsresult CreateAndAddRange(nsIDOMNode *aParentNode, PRInt32 aOffset); nsresult ClearNormalSelection(); nsCOMPtr mCellParent; //used to snap to table selection nsCOMPtr mStartSelectedCell; nsCOMPtr mEndSelectedCell; nsCOMPtr mAppendStartSelectedCell; nsCOMPtr mUnselectCellOnMouseUp; PRInt32 mSelectingTableCellMode; PRInt32 mSelectedCellIndex; // maintain selection nsCOMPtr mMaintainRange; nsSelectionAmount mMaintainedAmount; //batching PRInt32 mBatching; nsIContent *mLimiter; //limit selection navigation to a child of this node. nsIPresShell *mShell; PRInt16 mSelectionChangeReason; // reason for notifications of selection changing PRInt16 mDisplaySelection; //for visual display purposes. HINT mHint; //hint to tell if the selection is at the end of this line or beginning of next PRInt32 mDesiredX; nsIScrollableView *mScrollView; nsMouseEvent mDelayedMouseEvent; PRPackedBool mDelayCaretOverExistingSelection; PRPackedBool mDelayedMouseEventValid; PRPackedBool mChangesDuringBatching; PRPackedBool mNotifyFrames; PRPackedBool mIsEditor; PRPackedBool mDragSelectingCells; PRPackedBool mMouseDownState; //for drag purposes PRPackedBool mMouseDoubleDownState; //has the doubleclick down happened PRPackedBool mDesiredXSet; PRInt8 mCaretMovementStyle; }; NS_DEFINE_STATIC_IID_ACCESSOR(nsFrameSelection, NS_FRAME_SELECTION_IID) #endif /* nsFrameSelection_h___ */