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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 1.0 (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 nsISizeOfHandler;
class nsISpaceManager;
class nsIStyleContext;
class nsIView;
class nsIWidget;
class nsIReflowCommand;
class nsIListFilter;
class nsAutoString;
class nsString;
struct nsPoint;
struct nsRect;
struct nsStyleStruct;
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
//----------------------------------------------------------------------
/**
* 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 set the initial list of frames. This happens after the frame
* has been initialized and had its style context set.
*
* 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
*/
NS_IMETHOD SetInitialChildList(nsIPresContext& aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList) = 0;
/**
* Add this object's size information to the sizeof handler. Note that
* this does <b>not</b> add in the size of content, style, or view's
* (those are sized seperately).
*/
NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler) const = 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 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.
*/
NS_IMETHOD ReResolveStyleContext(nsIPresContext* aPresContext,
nsIStyleContext* aParentContext) = 0;
/**
* Accessor functions for geometric and content parent.
*/
NS_IMETHOD GetContentParent(nsIFrame*& aParent) const = 0;
NS_IMETHOD SetContentParent(const nsIFrame* aParent) = 0;
NS_IMETHOD GetGeometricParent(nsIFrame*& aParent) const = 0;
NS_IMETHOD SetGeometricParent(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;
/**
* Painting
*/
NS_IMETHOD Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect) = 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& aPresContext,
nsIRenderingContext * aRendContext,
nsGUIEvent* aEvent,
nsIFrame * aNewFrame,
PRUint32& aAcutalContentOffset,
PRInt32& aOffset) = 0;
/**
* Get the cursor for a given point in the frame tree. The
* call returns the desired cursor (or NS_STYLE_CURSOR_INHERIT if
* no cursor is wanted). In addition, if a cursor is desired
* then *aFrame is set to the frame that wants the cursor.
*/
NS_IMETHOD GetCursorAndContentAt(nsIPresContext& aPresContext,
const nsPoint& aPoint,
nsIFrame** aFrame,
nsIContent** aContent,
PRInt32& aCursor) = 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. CreateContinuingFrame() is responsible for
* appending the continuing frame to the flow.
*/
NS_IMETHOD CreateContinuingFrame(nsIPresContext& aPresContext,
nsIFrame* aParent,
nsIStyleContext* aStyleContext,
nsIFrame*& aContinuingFrame) = 0;
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;
/**
* Is this frame a "containing block"?
*/
NS_IMETHOD IsPercentageBase(PRBool& aBase) const = 0;
/**
* Gets the size of an "auto" margin.
*/
NS_IMETHOD GetAutoMarginSize(PRUint8 aSide, nscoord& aSize) 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 = stdout, PRInt32 aIndent = 0, nsIListFilter *aFilter = nsnull) const= 0;
NS_IMETHOD ListTag(FILE* out = stdout) const = 0;
NS_IMETHOD VerifyTree() const = 0;
static NS_LAYOUT nsIListFilter * GetFilter(nsString *aFilterName);
/**
* 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();
protected:
static NS_LAYOUT PRLogModuleInfo* gLogModule;
private:
NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
NS_IMETHOD_(nsrefcnt) Release(void) = 0;
};
/* ----- nsIListFilter definition ----- */
class nsIListFilter
{
public:
virtual PRBool OutputTag(nsAutoString *aTag) const = 0;
};
#endif /* nsIFrame_h___ */
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