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gecko-dev/layout/base/public/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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsIFrame_h___
#define nsIFrame_h___
#include <stdio.h>
#include "nslayout.h"
#include "nsISupports.h"
#include "nsSize.h"
#include "nsGUIEvent.h"
#include "nsStyleStruct.h"
class nsIAtom;
class nsIContent;
class nsIFrame;
class nsIPresContext;
class nsIPresShell;
class nsIRenderingContext;
class nsISpaceManager;
class nsIStyleContext;
class nsIView;
class nsIWidget;
class nsIReflowCommand;
class nsAutoString;
class nsString;
class nsIFocusTracker;
class nsStyleChangeList;
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
// 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.
eSelectNoAmount = 3 //just bounce back current offset.
};
enum nsDirection {
eDirNext = 0,
eDirPrevious= 1
};
enum nsSpread {
eSpreadNone = 0,
eSpreadAcross = 1,
eSpreadDown = 2
};
//----------------------------------------------------------------------
/**
* 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 DeleteFrame() member function
* to delete 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;
/**
* 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
* @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 do something with the new frames
* 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
* @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 do something with the new frames
* 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
* @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_UNEXPECTED if the frame is an atomic frame
* NS_OK otherwise
*/
NS_IMETHOD RemoveFrame(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame) = 0;
/**
* Deletes this frame and each of its child frames (recursively calls
* DeleteFrame() for each child)
*/
NS_IMETHOD DeleteFrame(nsIPresContext& aPresContext) = 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;
/**
* Re-resolve style context and either reset or re-resolve children.
* This is called in response to style changes that require context
* re-resolution.
* This is also used when style context parentage has to change for
* reflow purposes.
* When used for reflow, changelist and return change may be nsnull
* aLocalChange is provided only for subclasses that override this
* method to capture local change information
*
* When local style context changes, call CaptureStyleChageFor
* to capture change data into change list. Pass local change
* to children as parent change
*/
NS_IMETHOD ReResolveStyleContext(nsIPresContext* aPresContext,
nsIStyleContext* aParentContext,
PRInt32 aParentChange,
nsStyleChangeList* aChangeList,
PRInt32* aLocalChange) = 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(const nsRect& aRect) = 0;
NS_IMETHOD MoveTo(nscoord aX, nscoord aY) = 0;
NS_IMETHOD SizeTo(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 GetPosition(nsIPresContext& aCX,
nscoord aXCoord,
nsIContent ** aNewContent,
PRInt32& aContentOffset,
PRInt32& aContentOffsetEnd) = 0;
/**
* Get the cursor for a given frame.
*/
NS_IMETHOD GetCursor(nsIPresContext& aPresContext,
nsPoint& aPoint,
PRInt32& aCursor) = 0;
NS_IMETHOD GetFrameForPoint(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
*/
NS_IMETHOD GetChildFrameContainingOffset(PRInt32 inContentOffset,
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 generating an incremental reflow command.
*
* @param aChild the content object
* @param aAttribute the attribute whose value changed
*/
NS_IMETHOD AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsIAtom* aAttribute,
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;
NS_IMETHOD AppendToFlow(nsIFrame* aAfterFrame) = 0;
NS_IMETHOD PrependToFlow(nsIFrame* aBeforeFrame) = 0;
NS_IMETHOD RemoveFromFlow() = 0;
NS_IMETHOD BreakFromPrevFlow() = 0;
NS_IMETHOD BreakFromNextFlow() = 0;
/**
* Accessor functions to get/set the associated view object
*/
NS_IMETHOD GetView(nsIView** aView) const = 0; // may be null
NS_IMETHOD SetView(nsIView* aView) = 0;
/**
* Find the first geometric parent that has a view
*/
NS_IMETHOD GetParentWithView(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(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(nsIWidget**) 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;
/**
* Does this frame have content that is considered "transparent"?
* This is binary transparency as opposed to translucency. MMP
*/
NS_IMETHOD IsTransparent(PRBool& aTransparent) 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;
// Debugging
NS_IMETHOD List(FILE* out, PRInt32 aIndent) const = 0;
/**
* Get a printable from of the name of the frame type.
*/
NS_IMETHOD GetFrameName(nsString& aResult) const = 0;
/**
* Called to dump out regression data that describes the layout
* of the frame and it's children, and so on. The format of the
* data is dictated to be XML (using a specific DTD); the
* specific kind of data dumped is up to the frame itself, with
* the caveat that some base types are defined.
* For more information, see XXX.
*/
NS_IMETHOD DumpRegressionData(FILE* out, PRInt32 aIndent) = 0;
NS_IMETHOD VerifyTree() const = 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(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 aTracker is used to get the PresContext usefull for measuring text ect.
* @param aDesiredX is the "desired" location of the new caret
* @param aAmount eWord, eCharacter, eLine
* @param aDirection enum defined in this file to be eForward or eBackward
* @param aStartOffset start offset to start the peek. 0 == beginning -1 = end
* @param aResultContent content that actually is the next/previous
* @param aResultOffset offset for result content
* @param aEatingWS boolean to tell us the state of our search for Next/Prev
*/
NS_IMETHOD PeekOffset(nsIFocusTracker *aTracker, PRInt32 aDesiredX, nsSelectionAmount aAmount, nsDirection aDirection, PRInt32 aStartOffset,
nsIContent **aResultContent, PRInt32 *aResultOffset, PRBool aEatingWS) = 0;
/**
* See if tree verification is enabled. To enable tree verification add
* "frameverifytree:1" to your NSPR_LOG_MODULES environment variable
* (any non-zero debug level will work). Or, call SetVerifyTreeEnable
* with PR_TRUE.
*/
static NS_LAYOUT PRBool GetVerifyTreeEnable();
/**
* Set the verify-tree enable flag.
*/
static NS_LAYOUT void SetVerifyTreeEnable(PRBool aEnabled);
/**
* The frame class and related classes share an nspr log module
* for logging frame activity.
*
* Note: the log module is created during library initialization which
* means that you cannot perform logging before then.
*/
static NS_LAYOUT PRLogModuleInfo* GetLogModuleInfo();
// Show frame borders when rendering
static NS_LAYOUT void ShowFrameBorders(PRBool aEnable);
static NS_LAYOUT PRBool GetShowFrameBorders();
private:
NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
NS_IMETHOD_(nsrefcnt) Release(void) = 0;
};
#endif /* nsIFrame_h___ */
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