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gecko-dev/layout/generic/nsIFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsIFrame_h___
#define nsIFrame_h___
#include <stdio.h>
#include "nslayout.h"
#include "nsISupports.h"
#include "nsSize.h"
#include "nsGUIEvent.h"
#include "nsStyleConsts.h"
#include "nsStyleStruct.h"
#include "nsStyleCoord.h"
#include "nsHTMLReflowState.h"
class nsIAtom;
class nsIContent;
class nsIPresContext;
class nsIPresShell;
class nsIRenderingContext;
class nsISizeOfHandler;
class nsIStyleContext;
class nsIView;
class nsIWidget;
class nsAutoString;
class nsString;
class nsIFocusTracker;
class nsStyleChangeList;
class nsBlockFrame;
class nsLineLayout;
struct nsPeekOffsetStruct;
struct nsPoint;
struct nsRect;
struct nsStyleStruct;
class nsIDOMRange;
class nsICaret;
struct PRLogModuleInfo;
// IID for the nsIFrame interface
// a6cf9050-15b3-11d2-932e-00805f8add32
#define NS_IFRAME_IID \
{ 0xa6cf9050, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}
/**
* Indication of how the frame can be split. This is used when doing runaround
* of floaters, and when pulling up child frames from a next-in-flow.
*
* The choices are splittable, not splittable at all, and splittable in
* a non-rectangular fashion. This last type only applies to block-level
* elements, and indicates whether splitting can be used when doing runaround.
* If you can split across page boundaries, but you expect each continuing
* frame to be the same width then return frSplittable and not
* frSplittableNonRectangular.
*
* @see #IsSplittable()
*/
typedef PRUint32 nsSplittableType;
#define NS_FRAME_NOT_SPLITTABLE 0 // Note: not a bit!
#define NS_FRAME_SPLITTABLE 0x1
#define NS_FRAME_SPLITTABLE_NON_RECTANGULAR 0x3
#define NS_FRAME_IS_SPLITTABLE(type)\
(0 != ((type) & NS_FRAME_SPLITTABLE))
#define NS_FRAME_IS_NOT_SPLITTABLE(type)\
(0 == ((type) & NS_FRAME_SPLITTABLE))
//----------------------------------------------------------------------
/**
* Frame state bits. Any bits not listed here are reserved for future
* extensions, but must be stored by the frames.
*/
typedef PRUint32 nsFrameState;
#define NS_FRAME_IN_REFLOW 0x00000001
// This bit is set when a frame is created. After it has been reflowed
// once (during the DidReflow with a finished state) the bit is
// cleared.
#define NS_FRAME_FIRST_REFLOW 0x00000002
// If this bit is is set, then the view position and size should be
// kept in sync with the frame position and size. If the bit is not
// set then it's the responsibility of the frame itself (or whoever
// created the view) to position and size its associated view
#define NS_FRAME_SYNC_FRAME_AND_VIEW 0x00000004
// If this bit is set, then there is a child frame in the frame that
// extends outside this frame's bounding box. The implication is that
// the frames rect does not completely cover its children and
// therefore operations like rendering and hit testing (for example)
// must operate differently.
#define NS_FRAME_OUTSIDE_CHILDREN 0x00000008
// If this bit is set, then a reference to the frame is being held
// elsewhere. The frame may want to send a notification when it is
// destroyed to allow these references to be cleared.
#define NS_FRAME_EXTERNAL_REFERENCE 0x00000010
// If this bit is set, then the frame is a replaced element. For example,
// a frame displaying an image
#define NS_FRAME_REPLACED_ELEMENT 0x00000020
// If this bit is set, then the frame corresponds to generated content
#define NS_FRAME_GENERATED_CONTENT 0x00000040
// If this bit is set, then the frame has requested one or more image
// loads via the nsIPresContext.StartLoadImage API at some time during
// its lifetime.
#define NS_FRAME_HAS_LOADED_IMAGES 0x00000080
// If this bit is set, then the frame is has been moved out of the flow,
// e.g., it is absolutely positioned or floated
#define NS_FRAME_OUT_OF_FLOW 0x00000100
// If this bit is set, then the frame reflects content that may be selected
#define NS_FRAME_SELECTED_CONTENT 0x00000200
// If this bit is set, then the frame is dirty and needs to be reflowed.
// This bit is set when the frame is first created
#define NS_FRAME_IS_DIRTY 0x00000400
// If this bit is set then the frame is unflowable.
#define NS_FRAME_IS_UNFLOWABLE 0x00000800
// The low 16 bits of the frame state word are reserved by this API.
#define NS_FRAME_RESERVED 0x0000FFFF
// The upper 16 bits of the frame state word are reserved for frame
// implementations.
#define NS_FRAME_IMPL_RESERVED 0xFFFF0000
//----------------------------------------------------------------------
enum nsFramePaintLayer {
eFramePaintLayer_Underlay = 0,
eFramePaintLayer_Content = 1,
eFramePaintLayer_Overlay = 2
};
enum nsSelectionAmount {
eSelectCharacter = 0,
eSelectWord = 1,
eSelectLine = 2, //previous drawn line in flow.
eSelectBeginLine = 3,
eSelectEndLine = 4,
eSelectNoAmount = 5, //just bounce back current offset.
eSelectDir = 6 //select next/previous frame based on direction
};
enum nsDirection {
eDirNext = 0,
eDirPrevious= 1
};
enum nsSpread {
eSpreadNone = 0,
eSpreadAcross = 1,
eSpreadDown = 2
};
//----------------------------------------------------------------------
/**
* Reflow metrics used to return the frame's desired size and alignment
* information.
*
* @see #Reflow()
*/
struct nsHTMLReflowMetrics {
nscoord width, height; // [OUT] desired width and height
nscoord ascent, descent; // [OUT] ascent and descent information
// Set this to null if you don't need to compute the max element size
nsSize* maxElementSize; // [IN OUT]
// Carried out bottom margin values. This is the collapsed
// (generational) bottom margin value.
nscoord mCarriedOutBottomMargin;
// For frames that have children that stick outside their rect
// (NS_FRAME_OUTSIDE_CHILDREN) this rectangle will contain the
// absolute bounds of the frame. Since the frame doesn't know where
// it is going to be positioned in its parent, the assumption is
// that it is placed at 0,0 when computing this area.
nsRect mCombinedArea;
nsHTMLReflowMetrics(nsSize* aMaxElementSize) {
maxElementSize = aMaxElementSize;
mCarriedOutBottomMargin = 0;
mCombinedArea.x = 0;
mCombinedArea.y = 0;
mCombinedArea.width = 0;
mCombinedArea.height = 0;
// XXX These are OUT parameters and so they shouldn't have to be
// initialized, but there are some bad frame classes that aren't
// properly setting them when returning from Reflow()...
width = height = 0;
ascent = descent = 0;
}
void AddBorderPaddingToMaxElementSize(const nsMargin& aBorderPadding) {
maxElementSize->width += aBorderPadding.left + aBorderPadding.right;
maxElementSize->height += aBorderPadding.top + aBorderPadding.bottom;
}
};
// Carried out margin flags
#define NS_CARRIED_TOP_MARGIN_IS_AUTO 0x1
#define NS_CARRIED_BOTTOM_MARGIN_IS_AUTO 0x2
//----------------------------------------------------------------------
// For HTML reflow we rename with the different paint layers are
// actually used for.
#define NS_FRAME_PAINT_LAYER_BACKGROUND eFramePaintLayer_Underlay
#define NS_FRAME_PAINT_LAYER_FLOATERS eFramePaintLayer_Content
#define NS_FRAME_PAINT_LAYER_FOREGROUND eFramePaintLayer_Overlay
#define NS_FRAME_PAINT_LAYER_DEBUG eFramePaintLayer_Overlay
/**
* Reflow status returned by the reflow methods.
*
* NS_FRAME_NOT_COMPLETE bit flag means the frame does not map all its
* content, and that the parent frame should create a continuing frame.
* If this bit isn't set it means the frame does map all its content.
*
* NS_FRAME_REFLOW_NEXTINFLOW bit flag means that the next-in-flow is
* dirty, and also needs to be reflowed. This status only makes sense
* for a frame that is not complete, i.e. you wouldn't set both
* NS_FRAME_COMPLETE and NS_FRAME_REFLOW_NEXTINFLOW
*
* The low 8 bits of the nsReflowStatus are reserved for future extensions;
* the remaining 24 bits are zero (and available for extensions; however
* API's that accept/return nsReflowStatus must not receive/return any
* extension bits).
*
* @see #Reflow()
*/
typedef PRUint32 nsReflowStatus;
#define NS_FRAME_COMPLETE 0 // Note: not a bit!
#define NS_FRAME_NOT_COMPLETE 0x1
#define NS_FRAME_REFLOW_NEXTINFLOW 0x2
#define NS_FRAME_IS_COMPLETE(status) \
(0 == ((status) & NS_FRAME_NOT_COMPLETE))
#define NS_FRAME_IS_NOT_COMPLETE(status) \
(0 != ((status) & NS_FRAME_NOT_COMPLETE))
// This macro tests to see if an nsReflowStatus is an error value
// or just a regular return value
#define NS_IS_REFLOW_ERROR(_status) (PRInt32(_status) < 0)
/**
* Extensions to the reflow status bits defined by nsIFrameReflow
*/
// This bit is set, when a break is requested. This bit is orthogonal
// to the nsIFrame::nsReflowStatus completion bits.
#define NS_INLINE_BREAK 0x0100
// When a break is requested, this bit when set indicates that the
// break should occur after the frame just reflowed; when the bit is
// clear the break should occur before the frame just reflowed.
#define NS_INLINE_BREAK_BEFORE 0x0000
#define NS_INLINE_BREAK_AFTER 0x0200
// The type of break requested can be found in these bits.
#define NS_INLINE_BREAK_TYPE_MASK 0xF000
//----------------------------------------
// Macros that use those bits
#define NS_INLINE_IS_BREAK(_status) \
(0 != ((_status) & NS_INLINE_BREAK))
#define NS_INLINE_IS_BREAK_AFTER(_status) \
(0 != ((_status) & NS_INLINE_BREAK_AFTER))
#define NS_INLINE_IS_BREAK_BEFORE(_status) \
(NS_INLINE_BREAK == ((_status) & (NS_INLINE_BREAK|NS_INLINE_BREAK_AFTER)))
#define NS_INLINE_GET_BREAK_TYPE(_status) (((_status) >> 12) & 0xF)
#define NS_INLINE_MAKE_BREAK_TYPE(_type) ((_type) << 12)
// Construct a line-break-before status. Note that there is no
// completion status for a line-break before because we *know* that
// the frame will be reflowed later and hence it's current completion
// status doesn't matter.
#define NS_INLINE_LINE_BREAK_BEFORE() \
(NS_INLINE_BREAK | NS_INLINE_BREAK_BEFORE | \
NS_INLINE_MAKE_BREAK_TYPE(NS_STYLE_CLEAR_LINE))
// Take a completion status and add to it the desire to have a
// line-break after. For this macro we do need the completion status
// because the user of the status will need to know whether to
// continue the frame or not.
#define NS_INLINE_LINE_BREAK_AFTER(_completionStatus) \
((_completionStatus) | NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER | \
NS_INLINE_MAKE_BREAK_TYPE(NS_STYLE_CLEAR_LINE))
//----------------------------------------------------------------------
/**
* DidReflow status values.
*/
typedef PRBool nsDidReflowStatus;
#define NS_FRAME_REFLOW_NOT_FINISHED PR_FALSE
#define NS_FRAME_REFLOW_FINISHED PR_TRUE
//----------------------------------------------------------------------
/**
* A frame in the layout model. This interface is supported by all frame
* objects.
*
* Frames can have multiple child lists: the default unnamed child list
* (referred to as the <i>principal</i> child list, and additional named
* child lists. There is an ordering of frames within a child list, but
* there is no order defined between frames in different child lists of
* the same parent frame.
*
* Frames are NOT reference counted. Use the Destroy() member function
* to destroy a frame. The lifetime of the frame hierarchy is bounded by the
* lifetime of the presentation shell which owns the frames.
*/
class nsIFrame : public nsISupports
{
public:
/**
* Called to initialize the frame. This is called immediately after creating
* the frame.
*
* If the frame is a continuing frame, then aPrevInFlow indicates the previous
* frame (the frame that was split). You should connect the continuing frame to
* its prev-in-flow, e.g. by using the AppendToFlow() function
*
* If you want a view associated with your frame, you should create the view
* now.
*
* @param aContent the content object associated with the frame
* @param aGeometricParent the geometric parent frame
* @param aContentParent the content parent frame
* @param aContext the style context associated with the frame
* @param aPrevInFlow the prev-in-flow frame
* @see #AppendToFlow()
*/
NS_IMETHOD Init(nsIPresContext& aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow) = 0;
/**
* Destroys this frame and each of its child frames (recursively calls
* Destroy() for each child)
*/
NS_IMETHOD Destroy(nsIPresContext& aPresContext) = 0;
/**
* Called to set the initial list of frames. This happens after the frame
* has been initialized.
*
* This is only called once for a given child list, and won't be called
* at all for child lists with no initial list of frames.
*
* @param aListName the name of the child list. A NULL pointer for the atom
* name means the unnamed principal child list
* @param aChildList list of child frames. Each of the frames has its
* NS_FRAME_IS_DIRTY bit set
* @return NS_ERROR_INVALID_ARG if there is no child list with the specified
* name,
* NS_ERROR_UNEXPECTED if the frame is an atomic frame or if the
* initial list of frames has already been set for that child list,
* NS_OK otherwise
* @see #Init()
*/
NS_IMETHOD SetInitialChildList(nsIPresContext& aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList) = 0;
/**
* This method is responsible for appending frames to the frame
* list. The implementation should append the frames to the specified
* child list and then generate a reflow command.
*
* @param aListName the name of the child list. A NULL pointer for the atom
* name means the unnamed principal child list
* @param aFrameList list of child frames to append. Each of the frames has
* its NS_FRAME_IS_DIRTY bit set
* @return NS_ERROR_INVALID_ARG if there is no child list with the specified
* name,
* NS_ERROR_UNEXPECTED if the frame is an atomic frame,
* NS_OK otherwise
*/
NS_IMETHOD AppendFrames(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList) = 0;
/**
* This method is responsible for inserting frames into the frame
* list. The implementation should insert the new frames into the specified
* child list and then generate a reflow command.
*
* @param aListName the name of the child list. A NULL pointer for the atom
* name means the unnamed principal child list
* @param aPrevFrame the frame to insert frames <b>after</b>
* @param aFrameList list of child frames to insert <b>after</b> aPrevFrame.
* Each of the frames has its NS_FRAME_IS_DIRTY bit set
* @return NS_ERROR_INVALID_ARG if there is no child list with the specified
* name,
* NS_ERROR_UNEXPECTED if the frame is an atomic frame,
* NS_OK otherwise
*/
NS_IMETHOD InsertFrames(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList) = 0;
/**
* This method is responsible for removing a frame in the frame
* list. The implementation should do something with the removed frame
* and then generate a reflow command. The implementation is responsible
* for destroying aOldFrame (the caller mustn't destroy aOldFrame).
*
* @param aListName the name of the child list. A NULL pointer for the atom
* name means the unnamed principal child list
* @param aOldFrame the frame to remove
* @return NS_ERROR_INVALID_ARG if there is no child list with the specified
* name,
* NS_ERROR_FAILURE if the child frame is not in the specified
* child list,
* NS_ERROR_UNEXPECTED if the frame is an atomic frame,
* NS_OK otherwise
*/
NS_IMETHOD RemoveFrame(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame) = 0;
/**
* This method is responsible for replacing the old frame with the
* new frame. The old frame should be destroyed and the new frame inserted
* in its place in the specified child list.
*
* @param aListName the name of the child list. A NULL pointer for the atom
* name means the unnamed principal child list
* @param aOldFrame the frame to remove
* @param aNewFrame the frame to replace it with. The new frame has its
* NS_FRAME_IS_DIRTY bit set
* @return NS_ERROR_INVALID_ARG if there is no child list with the specified
* name,
* NS_ERROR_FAILURE if the old child frame is not in the specified
* child list,
* NS_ERROR_UNEXPECTED if the frame is an atomic frame,
* NS_OK otherwise
*/
NS_IMETHOD ReplaceFrame(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame) = 0;
/**
* Get the content object associated with this frame. Adds a reference to
* the content object so the caller must do a release.
*
* @see nsISupports#Release()
*/
NS_IMETHOD GetContent(nsIContent** aContent) const = 0;
/**
* Get the offsets of the frame. most will be 0,0
*
*/
NS_IMETHOD GetOffsets(PRInt32 &start, PRInt32 &end) const = 0;
/**
* Get the style context associated with this frame. Note that GetStyleContext()
* adds a reference to the style context so the caller must do a release.
*
* @see nsISupports#Release()
*/
NS_IMETHOD GetStyleContext(nsIStyleContext** aStyleContext) const = 0;
NS_IMETHOD SetStyleContext(nsIPresContext* aPresContext,
nsIStyleContext* aContext) = 0;
/**
* Get the style data associated with this frame.
*/
NS_IMETHOD GetStyleData(nsStyleStructID aSID,
const nsStyleStruct*& aStyleStruct) const = 0;
/**
* These methods are to access any additional style contexts that
* the frame may be holding. These are contexts that are children
* of the frame's primary context and are NOT used as style contexts
* for any child frames. These contexts also MUST NOT have any child
* contexts whatsoever. If you need to insert style contexts into the
* style tree, then you should create pseudo element frames to own them
* The indicies must be consecutive and implementations MUST return an
* NS_ERROR_INVALID_ARG if asked for an index that is out of range.
*/
NS_IMETHOD GetAdditionalStyleContext(PRInt32 aIndex,
nsIStyleContext** aStyleContext) const = 0;
NS_IMETHOD SetAdditionalStyleContext(PRInt32 aIndex,
nsIStyleContext* aStyleContext) = 0;
/**
* Accessor functions for geometric parent
*/
NS_IMETHOD GetParent(nsIFrame** aParent) const = 0;
NS_IMETHOD SetParent(const nsIFrame* aParent) = 0;
/**
* Bounding rect of the frame. The values are in twips, and the origin is
* relative to the upper-left of the geometric parent. The size includes the
* content area, borders, and padding.
*/
NS_IMETHOD GetRect(nsRect& aRect) const = 0;
NS_IMETHOD GetOrigin(nsPoint& aPoint) const = 0;
NS_IMETHOD GetSize(nsSize& aSize) const = 0;
NS_IMETHOD SetRect(nsIPresContext* aPresContext,
const nsRect& aRect) = 0;
NS_IMETHOD MoveTo(nsIPresContext* aPresContext,
nscoord aX,
nscoord aY) = 0;
NS_IMETHOD SizeTo(nsIPresContext* aPresContext,
nscoord aWidth,
nscoord aHeight) = 0;
/**
* Used to iterate the list of additional child list names. Returns the atom
* name for the additional child list at the specified 0-based index, or a
* NULL pointer if there are no more named child lists.
*
* Note that the list is only the additional named child lists and does not
* include the unnamed principal child list.
*
* @return NS_ERROR_INVALID_ARG if the index is < 0 and NS_OK otherwise
*/
NS_IMETHOD GetAdditionalChildListName(PRInt32 aIndex,
nsIAtom** aListName) const = 0;
/**
* Get the first child frame from the specified child list.
*
* @param aListName the name of the child list. A NULL pointer for the atom
* name means the unnamed principal child list
* @return NS_ERROR_INVALID_ARG if there is no child list with the specified name
* @see #GetAdditionalListName()
*/
NS_IMETHOD FirstChild(nsIAtom* aListName, nsIFrame** aFirstChild) const = 0;
/**
* Child frames are linked together in a singly-linked
*/
NS_IMETHOD GetNextSibling(nsIFrame** aNextSibling) const = 0;
NS_IMETHOD SetNextSibling(nsIFrame* aNextSibling) = 0;
/**
* Paint is responsible for painting the a frame. The aWhichLayer
* argument indicates which layer of painting should be done during
* the call.
*/
NS_IMETHOD Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer) = 0;
/**
* Event handling of GUI events.
*
* @param aEvent event structure describing the type of event and rge widget
* where the event originated
* @param aEventStatus a return value indicating whether the event was handled
* and whether default processing should be done
*
* XXX From a frame's perspective it's unclear what the effect of the event status
* is. Does it cause the event to continue propagating through the frame hierarchy
* or is it just returned to the widgets?
*
* @see nsGUIEvent
* @see nsEventStatus
*/
NS_IMETHOD HandleEvent(nsIPresContext& aPresContext,
nsGUIEvent* aEvent,
nsEventStatus& aEventStatus) = 0;
NS_IMETHOD GetContentAndOffsetsFromPoint(nsIPresContext& aCX,
const nsPoint& aPoint,
nsIContent ** aNewContent,
PRInt32& aContentOffset,
PRInt32& aContentOffsetEnd,
PRBool& aBeginFrameContent) = 0;
/**
* Get the cursor for a given frame.
*/
NS_IMETHOD GetCursor(nsIPresContext& aPresContext,
nsPoint& aPoint,
PRInt32& aCursor) = 0;
NS_IMETHOD GetFrameForPoint(nsIPresContext* aPresContext,
const nsPoint& aPoint,
nsIFrame** aFrame) = 0;
/**
* Get a point (in the frame's coordinate space) given an offset into
* the content. This point should be on the baseline of text with
* the correct horizontal offset
*/
NS_IMETHOD GetPointFromOffset(nsIPresContext* inPresContext,
nsIRenderingContext* inRendContext,
PRInt32 inOffset,
nsPoint* outPoint) = 0;
/**
* Get the child frame of this frame which contains the given
* content offset. outChildFrame may be this frame, or nsnull on return.
* outContentOffset returns the content offset relative to the start
* of the returned node. You can also pass a hint which tells the method
* to stick to the end of the first found frame or the beginning of the
* next in case the offset falls on a boundary.
*/
NS_IMETHOD GetChildFrameContainingOffset(PRInt32 inContentOffset,
PRBool inHint,//false stick left
PRInt32* outFrameContentOffset,
nsIFrame* *outChildFrame) = 0;
/**
* Get the current frame-state value for this frame. aResult is
* filled in with the state bits. The return value has no
* meaning.
*/
NS_IMETHOD GetFrameState(nsFrameState* aResult) = 0;
/**
* Set the current frame-state value for this frame. The return
* value has no meaning.
*/
NS_IMETHOD SetFrameState(nsFrameState aNewState) = 0;
/**
* This call is invoked when content is changed in the content tree.
* The first frame that maps that content is asked to deal with the
* change by generating an incremental reflow command.
*
* @param aIndexInParent the index in the content container where
* the new content was deleted.
*/
NS_IMETHOD ContentChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsISupports* aSubContent) = 0;
/**
* This call is invoked when the value of a content objects's attribute
* is changed.
* The first frame that maps that content is asked to deal
* with the change by doing whatever is appropriate.
*
* @param aChild the content object
* @param aAttribute the attribute whose value changed
* @param aHint the level of change that has already been dealt with
*/
NS_IMETHOD AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aHint) = 0;
/**
* This call is invoked when the value of a content object's state
* is changed.
* The first frame that maps that content is asked to deal
* with the change by doing whatever is appropriate.
*
* @param aChild the content object
* @param aHint the level of change that has already been dealt with
*/
NS_IMETHOD ContentStateChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aHint) = 0;
/**
* Return how your frame can be split.
*/
NS_IMETHOD IsSplittable(nsSplittableType& aIsSplittable) const = 0;
/**
* Flow member functions
*/
NS_IMETHOD GetPrevInFlow(nsIFrame** aPrevInFlow) const = 0;
NS_IMETHOD SetPrevInFlow(nsIFrame*) = 0;
NS_IMETHOD GetNextInFlow(nsIFrame** aNextInFlow) const = 0;
NS_IMETHOD SetNextInFlow(nsIFrame*) = 0;
/**
* Pre-reflow hook. Before a frame is reflowed this method will be called.
* This call will always be invoked at least once before a subsequent Reflow
* and DidReflow call. It may be called more than once, In general you will
* receive on WillReflow notification before each Reflow request.
*
* XXX Is this really the semantics we want? Because we have the NS_FRAME_IN_REFLOW
* bit we can ensure we don't call it more than once...
*/
NS_IMETHOD WillReflow(nsIPresContext& aPresContext) = 0;
/**
* The frame is given a maximum size and asked for its desired size.
* This is the frame's opportunity to reflow its children.
*
* @param aDesiredSize <i>out</i> parameter where you should return the
* desired size and ascent/descent info. You should include any
* space you want for border/padding in the desired size you return.
*
* It's okay to return a desired size that exceeds the max
* size if that's the smallest you can be, i.e. it's your
* minimum size.
*
* maxElementSize is an optional parameter for returning your
* maximum element size. If may be null in which case you
* don't have to compute a maximum element size. The
* maximum element size must be less than or equal to your
* desired size.
*
* For an incremental reflow you are responsible for invalidating
* any area within your frame that needs repainting (including
* borders). If your new desired size is different than your current
* size, then your parent frame is responsible for making sure that
* the difference between the two rects is repainted
*
* @param aReflowState information about your reflow including the reason
* for the reflow and the available space in which to lay out. Each
* dimension of the available space can either be constrained or
* unconstrained (a value of NS_UNCONSTRAINEDSIZE). If constrained
* you should choose a value that's less than or equal to the
* constrained size. If unconstrained you can choose as
* large a value as you like.
*
* Note that the available space can be negative. In this case you
* still must return an accurate desired size. If you're a container
* you must <b>always</b> reflow at least one frame regardless of the
* available space
*
* @param aStatus a return value indicating whether the frame is complete
* and whether the next-in-flow is dirty and needs to be reflowed
*/
NS_IMETHOD Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aReflowMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus) = 0;
/**
* Post-reflow hook. After a frame is reflowed this method will be called
* informing the frame that this reflow process is complete, and telling the
* frame the status returned by the Reflow member function.
*
* This call may be invoked many times, while NS_FRAME_IN_REFLOW is set, before
* it is finally called once with a NS_FRAME_REFLOW_COMPLETE value. When called
* with a NS_FRAME_REFLOW_COMPLETE value the NS_FRAME_IN_REFLOW bit in the
* frame state will be cleared.
*
* XXX This doesn't make sense. If the frame is reflowed but not complete, then
* the status should be NS_FRAME_NOT_COMPLETE and not NS_FRAME_COMPLETE
* XXX Don't we want the semantics to dictate that we only call this once for
* a given reflow?
*/
NS_IMETHOD DidReflow(nsIPresContext& aPresContext,
nsDidReflowStatus aStatus) = 0;
// XXX Maybe these three should be a separate interface?
// Helper method used by block reflow to identify runs of text so that
// proper word-breaking can be done.
NS_IMETHOD FindTextRuns(nsLineLayout& aLineLayout) = 0;
// Justification helper method used to distribute extra space in a
// line to leaf frames. aUsedSpace is filled in with the amount of
// space actually used.
NS_IMETHOD AdjustFrameSize(nscoord aExtraSpace, nscoord& aUsedSpace) = 0;
// Justification helper method that is used to remove trailing
// whitespace before justification.
NS_IMETHOD TrimTrailingWhiteSpace(nsIPresContext* aPresContext,
nsIRenderingContext& aRC,
nscoord& aDeltaWidth) = 0;
/**
* Accessor functions to get/set the associated view object
*/
NS_IMETHOD GetView(nsIPresContext* aPresContext,
nsIView** aView) const = 0; // may be null
NS_IMETHOD SetView(nsIPresContext* aPresContext,
nsIView* aView) = 0;
/**
* Find the first geometric parent that has a view
*/
NS_IMETHOD GetParentWithView(nsIPresContext* aPresContext,
nsIFrame** aParent) const = 0;
/**
* Returns the offset from this frame to the closest geometric parent that
* has a view. Also returns the containing view or null in case of error
*/
NS_IMETHOD GetOffsetFromView(nsIPresContext* aPresContext,
nsPoint& aOffset,
nsIView** aView) const = 0;
/**
* Returns the window that contains this frame. If this frame has a
* view and the view has a window, then this frames window is
* returned, otherwise this frame's geometric parent is checked
* recursively upwards.
*/
NS_IMETHOD GetWindow(nsIPresContext* aPresContext,
nsIWidget** aWidget) const = 0;
/**
* Get the "type" of the frame. May return a NULL atom pointer
*
* @see nsLayoutAtoms
*/
NS_IMETHOD GetFrameType(nsIAtom** aType) const = 0;
/**
* Is this frame a "containing block"?
*/
NS_IMETHOD IsPercentageBase(PRBool& aBase) const = 0;
/**
* called when the frame has been scrolled to a new
* position. only called for frames with views.
*/
NS_IMETHOD Scrolled(nsIView *aView) = 0;
/** Selection related calls
*/
/**
* Called to set the selection of the frame based on frame offsets. you can FORCE the frame
* to redraw event if aSelected == the frame selection with the last parameter.
* data in struct may be changed when passed in.
* @param aRange is the range that will dictate if the frames need to be redrawn null means the whole content needs to be redrawn
* @param aSelected is it selected
* @param aSpread should is spread selection to flow elements around it? or go down to its children?
*/
NS_IMETHOD SetSelected(nsIPresContext* aPresContext,
nsIDOMRange* aRange,
PRBool aSelected,
nsSpread aSpread) = 0;
NS_IMETHOD GetSelected(PRBool *aSelected) const = 0;
/** EndSelection related calls
*/
/**
* called to find the previous/next character, word, or line returns the actual
* nsIFrame and the frame offset. THIS DOES NOT CHANGE SELECTION STATE
* uses frame's begin selection state to start. if no selection on this frame will
* return NS_ERROR_FAILURE
* @param aPOS is defined in nsIFrameSelection
*/
NS_IMETHOD PeekOffset(nsIPresContext* aPresContext, nsPeekOffsetStruct *aPos) = 0;
private:
NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
NS_IMETHOD_(nsrefcnt) Release(void) = 0;
};
#endif /* nsIFrame_h___ */
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