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gecko-dev/layout/base/nsIFrameSelection.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
* NOTE!! This is not a general class, but specific to layout and frames.
* Consumers looking for the general selection interface should look at
* nsISelection.
*/
#ifndef nsIFrameSelection_h___
#define nsIFrameSelection_h___
#include "nsISupports.h"
#include "nsIFrame.h"
#include "nsIFocusTracker.h"
#include "nsISelection.h"
#include "nsIContent.h"
#include "nsCOMPtr.h"
#include "nsISelectionController.h"
// IID for the nsIFrameSelection interface
#define NS_IFRAMESELECTION_IID \
{ 0xf46e4171, 0xdeaa, 0x11d1, \
{ 0x97, 0xfc, 0x0, 0x60, 0x97, 0x3, 0xc1, 0x4e } }
//----------------------------------------------------------------------
// Selection interface
struct SelectionDetails
{
PRInt32 mStart;
PRInt32 mEnd;
SelectionType mType;
SelectionDetails *mNext;
};
/*PeekOffsetStruct
* @param mTracker is used to get the PresContext usefull for measuring text ect.
* @param mDesiredX is the "desired" location of the new caret
* @param mAmount eWord, eCharacter, eLine
* @param mDirection enum defined in this file to be eForward or eBackward
* @param mStartOffset start offset to start the peek. 0 == beginning -1 = end
* @param mResultContent content that actually is the next/previous
* @param mResultOffset offset for result content
* @param mResultFrame resulting frame for peeking
* @param mEatingWS boolean to tell us the state of our search for Next/Prev
* @param mPreferLeft true = prev line end, false = next line begin
* @param mJumpLines if this is true then its ok to cross lines while peeking
* @param mScrollViewStop if this is true then stop peeking across scroll view boundary
*/
struct nsPeekOffsetStruct
{
void SetData(nsIFocusTracker *aTracker,
nscoord aDesiredX,
nsSelectionAmount aAmount,
nsDirection aDirection,
PRInt32 aStartOffset,
PRBool aEatingWS,
PRBool aPreferLeft,
PRBool aJumpLines,
PRBool aScrollViewStop,
PRBool aIsKeyboardSelect)
{
mTracker=aTracker;
mDesiredX=aDesiredX;
mAmount=aAmount;
mDirection=aDirection;
mStartOffset=aStartOffset;
mEatingWS=aEatingWS;
mPreferLeft=aPreferLeft;
mJumpLines = aJumpLines;
mScrollViewStop = aScrollViewStop;
mIsKeyboardSelect = aIsKeyboardSelect;
}
nsIFocusTracker *mTracker;
nscoord mDesiredX;
nsSelectionAmount mAmount;
nsDirection mDirection;
PRInt32 mStartOffset;
nsCOMPtr<nsIContent> mResultContent;
PRInt32 mContentOffset;
PRInt32 mContentOffsetEnd;
nsIFrame *mResultFrame;
PRBool mEatingWS;
PRBool mPreferLeft;
PRBool mJumpLines;
PRBool mScrollViewStop;
PRBool mIsKeyboardSelect;
};
class nsIScrollableView;
class nsIFrameSelection : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IFRAMESELECTION_IID)
enum HINT { HINTLEFT = 0, HINTRIGHT = 1}; //end of this line or beginning of next
/** Init will initialize the frame selector with the necessary focus tracker to
* be used by most of the methods
* @param aTracker is the parameter to be used for most of the other calls for callbacks ect
* @param aLimiter limits the selection to nodes with aLimiter parents
*/
NS_IMETHOD Init(nsIFocusTracker *aTracker, nsIContent *aLimiter) = 0; //default since this isnt used for embedding
/* SetScrollableView sets the scroll view
* @param aScrollView is the scroll view for this selection.
*/
NS_IMETHOD SetScrollableView(nsIScrollableView *aScrollView) =0;
/* GetScrollableView gets the current scroll view
* @param aScrollView is the scroll view for this selection.
*/
NS_IMETHOD GetScrollableView(nsIScrollableView **aScrollView) =0;
/** ShutDown will be called when the owner of the frame selection is shutting down
* this should be the time to release all member variable interfaces. all methods
* called after ShutDown should return NS_ERROR_FAILURE
*/
NS_IMETHOD ShutDown() = 0;
/** HandleKeyEvent will accept an event.
* <P>DOES NOT ADDREF<P>
* @param aGuiEvent is the event that should be dealt with by aFocusFrame
* @param aFrame is the frame that MAY handle the event
*/
NS_IMETHOD HandleTextEvent(nsGUIEvent *aGuiEvent) = 0;
/** HandleKeyEvent will accept an event and a PresContext.
* <P>DOES NOT ADDREF<P>
* @param aGuiEvent is the event that should be dealt with by aFocusFrame
* @param aFrame is the frame that MAY handle the event
*/
NS_IMETHOD HandleKeyEvent(nsIPresContext* aPresContext, nsGUIEvent *aGuiEvent) = 0;
/** 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 = beggining of this line
*/
NS_IMETHOD HandleClick(nsIContent *aNewFocus, PRUint32 aContentOffset, PRUint32 aContentEndOffset ,
PRBool aContinueSelection, PRBool aMultipleSelection, PRBool aHint) = 0;
/** 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's parent view.
*/
NS_IMETHOD HandleDrag(nsIPresContext *aPresContext, nsIFrame *aFrame, nsPoint& aPoint) = 0;
/** 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 we can get where event occured and what keys are pressed
*/
NS_IMETHOD HandleTableSelection(nsIContent *aParentContent, PRInt32 aContentOffset, PRInt32 aTarget, nsMouseEvent *aMouseEvent) = 0;
/** StartAutoScrollTimer is responsible for scrolling the view so that aPoint is always
* visible, and for selecting any frame that contains aPoint. The timer will also reset
* itself to fire again if the view has not scrolled to the end of the document.
* @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's parent view.
* @param aDelay is the timer's interval.
*/
NS_IMETHOD StartAutoScrollTimer(nsIPresContext *aPresContext, nsIFrame *aFrame, nsPoint& aPoint, PRUint32 aDelay) = 0;
/** StopAutoScrollTimer stops any active auto scroll timer.
*/
NS_IMETHOD StopAutoScrollTimer() = 0;
/** EnableFrameNotification
* mutch like start batching, except all dirty calls are ignored. no notifications will go
* out until enableNotifications with a PR_TRUE is called
*/
NS_IMETHOD EnableFrameNotification(PRBool aEnable) = 0;
/** 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
*/
NS_IMETHOD LookUpSelection(nsIContent *aContent, PRInt32 aContentOffset, PRInt32 aContentLength,
SelectionDetails **aReturnDetails, PRBool aSlowCheck) = 0;
/** SetMouseDownState(PRBool);
* sets the mouse state to aState for resons of drag state.
* @param aState is the new state of mousedown
*/
NS_IMETHOD SetMouseDownState(PRBool aState)=0;
/** GetMouseDownState(PRBool *);
* gets the mouse state to aState for resons of drag state.
* @param aState will hold the state of mousedown
*/
NS_IMETHOD GetMouseDownState(PRBool *aState)=0;
/**
if we are in table cell selection mode. aka ctrl click in table cell
*/
NS_IMETHOD GetTableCellSelection(PRBool *aState)=0;
/** GetSelection
* no query interface for selection. must use this method now.
* @param aSelectionType enum value defined in nsISelection for the seleciton you want.
*/
NS_IMETHOD GetSelection(SelectionType aSelectionType, nsISelection **aSelection)=0;
/**
* 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
*/
NS_IMETHOD ScrollSelectionIntoView(SelectionType aSelectionType, SelectionRegion aRegion, PRBool aIsSynchronous)=0;
/** 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.
*/
NS_IMETHOD RepaintSelection(nsIPresContext* aPresContext, SelectionType aSelectionType)=0;
/** 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 aReturnFrame will contain the return frame. MUST NOT BE NULL or will return error
* @param aReturnOffset will contain offset into frame.
*/
NS_IMETHOD GetFrameForNodeOffset(nsIContent *aNode, PRInt32 aOffset, HINT aHint, nsIFrame **aReturnFrame, PRInt32 *aReturnOffset)=0;
/** AdjustOffsetsFromStyle. Called after detecting that a click or drag will
* select the frame, this function looks for user-select style on that frame or a parent
* frame, and adjust the content and offsets accordingly.
* @param aFrame the frame that was clicked
* @param outContent content node to be selected
* @param outStartOffset selection start offset
* @param outEndOffset selection end offset
*/
NS_IMETHOD AdjustOffsetsFromStyle(nsIFrame *aFrame, PRBool *changeSelection,
nsIContent** outContent, PRInt32* outStartOffset, PRInt32* outEndOffset)=0;
NS_IMETHOD GetHint(HINT *aHint)=0;
NS_IMETHOD SetHint(HINT aHint)=0;
/** 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
*/
NS_IMETHOD CharacterMove(PRBool aForward, PRBool aExtend)=0;
/** 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
*/
NS_IMETHOD WordMove(PRBool aForward, PRBool aExtend)=0;
/** 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
*/
NS_IMETHOD LineMove(PRBool aForward, PRBool aExtend)=0;
/** 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
*/
NS_IMETHOD IntraLineMove(PRBool aForward, PRBool aExtend)=0;
/**
* 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
*
* @param aFrameSel the nsIFrameSelection of the caller.
*
* @return always NS_OK
*/
NS_IMETHOD CommonPageMove(PRBool aForward,
PRBool aExtend,
nsIScrollableView *aScrollableView,
nsIFrameSelection *aFrameSel)=0;
/** Select All will generally be called from the nsiselectioncontroller implementations.
* it will select the whole doc
*/
NS_IMETHOD SelectAll()=0;
/** Sets/Gets The display selection enum.
*/
NS_IMETHOD SetDisplaySelection(PRInt16 aState)=0;
NS_IMETHOD GetDisplaySelection(PRInt16 *aState)=0;
/** 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 usefull 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.
*/
NS_IMETHOD SetDelayCaretOverExistingSelection(PRBool aDelay)=0;
/** Get the current delay caret setting. If aDelay contains
* a return value of PR_TRUE, the caret is placed on MouseUp
* when clicking over an existing selection. If PR_FALSE,
* the selection is cleared and caret is placed immediately
* in all cases.
* @param aDelay will contain the return value.
*/
NS_IMETHOD GetDelayCaretOverExistingSelection(PRBool *aDelay)=0;
/** 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.
*/
NS_IMETHOD SetDelayedCaretData(nsMouseEvent *aMouseEvent)=0;
/** Get the delayed MouseDown event data neccessary to place the
* caret during MouseUp processing.
* @aMouseEvent will contain a pointer to the event received
* by the selection during MouseDown processing. It can be NULL
* if the data is no longer valid.
*/
NS_IMETHOD GetDelayedCaretData(nsMouseEvent **aMouseEvent)=0;
/** 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!
*/
NS_IMETHOD GetLimiter(nsIContent **aLimiterContent)=0;
/** 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
*/
NS_IMETHOD SetMouseDoubleDown(PRBool aDoubleDown)=0;
/** This will return whether the double down flag was set.
* @aDoubleDown is the return boolean value
*/
NS_IMETHOD GetMouseDoubleDown(PRBool *aDoubleDown)=0;
/**
* 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
*/
NS_IMETHOD MaintainSelection()=0;
#ifdef IBMBIDI
/** GetPrevNextBidiLevels will return the frames and associated Bidi levels of the characters
* logically before and after a (collapsed) selection.
* @param aPresContext is the context to use
* @param aNode is the node containing the selection
* @param aContentOffset is the offset of the selection in the node
* @param aPrevFrame will hold the frame of the character before the selection
* @param aNextFrame will hold the frame of the character after the selection
* @param aPrevLevel will hold the Bidi level of the character before the selection
* @param aNextLevel will hold the Bidi level of the character after the selection
*
* 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 aPrevFrame and aNextFrame respectively will return nsnull.
*/
NS_IMETHOD GetPrevNextBidiLevels(nsIPresContext *aPresContext, nsIContent *aNode, PRUint32 aContentOffset,
nsIFrame **aPrevFrame, nsIFrame **aNextFrame, PRUint8 *aPrevLevel, PRUint8 *aNextLevel)=0;
/** 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
*/
NS_IMETHOD GetFrameFromLevel(nsIPresContext *aPresContext, nsIFrame *aFrameIn, nsDirection aDirection, PRUint8 aBidiLevel,
nsIFrame **aFrameOut)=0;
#endif // IBMBIDI
};
#endif /* nsIFrameSelection_h___ */
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