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https://github.com/mozilla/gecko-dev.git
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428 lines
15 KiB
C++
428 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsIFrame_h___
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#define nsIFrame_h___
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#include <stdio.h>
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#include "nslayout.h"
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#include "nsISupports.h"
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#include "nsSize.h"
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#include "nsGUIEvent.h"
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#include "nsStyleStruct.h"
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class nsIAtom;
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class nsIContent;
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class nsIFrame;
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class nsIPresContext;
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class nsIPresShell;
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class nsIRenderingContext;
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class nsISizeOfHandler;
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class nsISpaceManager;
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class nsIStyleContext;
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class nsIView;
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class nsIWidget;
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class nsIReflowCommand;
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class nsIListFilter;
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class nsAutoString;
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class nsString;
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struct nsPoint;
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struct nsRect;
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struct nsStyleStruct;
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struct PRLogModuleInfo;
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// IID for the nsIFrame interface
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// a6cf9050-15b3-11d2-932e-00805f8add32
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#define NS_IFRAME_IID \
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{ 0xa6cf9050, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}
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/**
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* Indication of how the frame can be split. This is used when doing runaround
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* of floaters, and when pulling up child frames from a next-in-flow.
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*
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* The choices are splittable, not splittable at all, and splittable in
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* a non-rectangular fashion. This last type only applies to block-level
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* elements, and indicates whether splitting can be used when doing runaround.
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* If you can split across page boundaries, but you expect each continuing
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* frame to be the same width then return frSplittable and not
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* frSplittableNonRectangular.
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*
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* @see #IsSplittable()
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*/
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typedef PRUint32 nsSplittableType;
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#define NS_FRAME_NOT_SPLITTABLE 0 // Note: not a bit!
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#define NS_FRAME_SPLITTABLE 0x1
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#define NS_FRAME_SPLITTABLE_NON_RECTANGULAR 0x3
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#define NS_FRAME_IS_SPLITTABLE(type)\
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(0 != ((type) & NS_FRAME_SPLITTABLE))
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#define NS_FRAME_IS_NOT_SPLITTABLE(type)\
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(0 == ((type) & NS_FRAME_SPLITTABLE))
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//----------------------------------------------------------------------
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/**
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* Frame state bits. Any bits not listed here are reserved for future
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* extensions, but must be stored by the frames.
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*/
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typedef PRUint32 nsFrameState;
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#define NS_FRAME_IN_REFLOW 0x00000001
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// This bit is set when a frame is created. After it has been reflowed
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// once (during the DidReflow with a finished state) the bit is
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// cleared.
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#define NS_FRAME_FIRST_REFLOW 0x00000002
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// If this bit is is set then the view position and size should be
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// kept in sync with the frame position and size. If the bit is not
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// set then it's the responsibility of the frame itself (or whoever
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// created the view) to position and size its associated view
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#define NS_FRAME_SYNC_FRAME_AND_VIEW 0x00000004
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// If this bit is set then there is a child frame in the frame that
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// extends outside this frame's bounding box. The implication is that
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// the frames rect does not completely cover its children and
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// therefore operations like rendering and hit testing (for example)
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// must operate differently.
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#define NS_FRAME_OUTSIDE_CHILDREN 0x00000008
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//----------------------------------------------------------------------
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/**
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* A frame in the layout model. This interface is supported by all frame
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* objects.
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*
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* Frames can have multiple child lists: the default unnamed child list
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* (referred to as the <i>principal</i> child list, and additional named
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* child lists. There is an ordering of frames within a child list, but
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* there is no order defined between frames in different child lists of
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* the same parent frame.
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*
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* Frames are NOT reference counted. Use the DeleteFrame() member function
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* to delete a frame. The lifetime of the frame hierarchy is bounded by the
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* lifetime of the presentation shell which owns the frames.
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*/
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class nsIFrame : public nsISupports
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{
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public:
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/**
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* Initialize the frame passing it its child frame list.
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*
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* This member function is called for all frames just after the frame is
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* constructed.
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*
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* You should reflow the frames when you get your 'initial' reflow
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* notification.
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*
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* @param aChildList list of child frames. May be NULL
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* @see #Reflow()
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*/
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NS_IMETHOD Init(nsIPresContext& aPresContext, nsIFrame* aChildList) = 0;
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/**
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* Add this object's size information to the sizeof handler. Note that
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* this does <b>not</b> add in the size of content, style, or view's
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* (those are sized seperately).
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*/
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NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler) const = 0;
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/**
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* Deletes this frame and each of its child frames (recursively calls
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* DeleteFrame() for each child)
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*/
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NS_IMETHOD DeleteFrame(nsIPresContext& aPresContext) = 0;
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/**
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* Get the content object associated with this frame. Adds a reference to
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* the content object so the caller must do a release.
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*
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* @see nsISupports#Release()
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*/
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NS_IMETHOD GetContent(nsIContent*& aContent) const = 0;
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/**
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* Get the style context associated with this frame. Note that GetStyleContext()
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* adds a reference to the style context so the caller must do a release.
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*
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* @see nsISupports#Release()
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*/
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NS_IMETHOD GetStyleContext(nsIStyleContext*& aStyleContext) const = 0;
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NS_IMETHOD SetStyleContext(nsIPresContext* aPresContext,
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nsIStyleContext* aContext) = 0;
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/**
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* Get the style data associated with this frame.
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*/
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NS_IMETHOD GetStyleData(nsStyleStructID aSID, const nsStyleStruct*& aStyleStruct) const = 0;
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/**
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* Re-resolve style context and either reset or re-resolve children.
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* This is called in response to style changes that require context
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* re-resolution.
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* This is also used when style context parentage has to change for
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* reflow purposes.
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*/
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NS_IMETHOD ReResolveStyleContext(nsIPresContext* aPresContext,
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nsIStyleContext* aParentContext) = 0;
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/**
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* Accessor functions for geometric and content parent.
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*/
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NS_IMETHOD GetContentParent(nsIFrame*& aParent) const = 0;
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NS_IMETHOD SetContentParent(const nsIFrame* aParent) = 0;
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NS_IMETHOD GetGeometricParent(nsIFrame*& aParent) const = 0;
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NS_IMETHOD SetGeometricParent(const nsIFrame* aParent) = 0;
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/**
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* Bounding rect of the frame. The values are in twips, and the origin is
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* relative to the upper-left of the geometric parent. The size includes the
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* content area, borders, and padding.
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*/
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NS_IMETHOD GetRect(nsRect& aRect) const = 0;
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NS_IMETHOD GetOrigin(nsPoint& aPoint) const = 0;
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NS_IMETHOD GetSize(nsSize& aSize) const = 0;
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NS_IMETHOD SetRect(const nsRect& aRect) = 0;
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NS_IMETHOD MoveTo(nscoord aX, nscoord aY) = 0;
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NS_IMETHOD SizeTo(nscoord aWidth, nscoord aHeight) = 0;
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/**
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* Get the first child frame from the specified child list.
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*
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* @param aListName the name of the child list. A NULL pointer for the atom
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* name means the unnamed principal child list
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* @return NS_ERROR_INVALID_ARG if there is no child list with the specified name
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* @see #GetAdditionalListName()
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*/
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NS_IMETHOD FirstChild(nsIAtom* aListName, nsIFrame*& aFirstChild) const = 0;
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/**
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* Child frames are linked together in a singly-linked
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*/
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NS_IMETHOD GetNextSibling(nsIFrame*& aNextSibling) const = 0;
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NS_IMETHOD SetNextSibling(nsIFrame* aNextSibling) = 0;
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/**
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* Painting
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*/
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NS_IMETHOD Paint(nsIPresContext& aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect) = 0;
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/**
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* Event handling of GUI events.
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*
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* @param aEvent event structure describing the type of event and rge widget
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* where the event originated
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* @param aEventStatus a return value indicating whether the event was handled
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* and whether default processing should be done
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*
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* XXX From a frame's perspective it's unclear what the effect of the event status
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* is. Does it cause the event to continue propagating through the frame hierarchy
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* or is it just returned to the widgets?
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*
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* @see nsGUIEvent
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* @see nsEventStatus
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*/
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NS_IMETHOD HandleEvent(nsIPresContext& aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus& aEventStatus) = 0;
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NS_IMETHOD GetPosition(nsIPresContext& aPresContext,
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nsIRenderingContext * aRendContext,
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nsGUIEvent* aEvent,
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nsIFrame * aNewFrame,
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PRUint32& aAcutalContentOffset,
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PRInt32& aOffset) = 0;
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/**
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* Get the cursor for a given point in the frame tree. The
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* call returns the desired cursor (or NS_STYLE_CURSOR_INHERIT if
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* no cursor is wanted). In addition, if a cursor is desired
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* then *aFrame is set to the frame that wants the cursor.
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*/
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NS_IMETHOD GetCursorAndContentAt(nsIPresContext& aPresContext,
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const nsPoint& aPoint,
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nsIFrame** aFrame,
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nsIContent** aContent,
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PRInt32& aCursor) = 0;
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/**
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* Get the current frame-state value for this frame. aResult is
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* filled in with the state bits. The return value has no
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* meaning.
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*/
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NS_IMETHOD GetFrameState(nsFrameState& aResult) = 0;
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/**
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* Set the current frame-state value for this frame. The return
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* value has no meaning.
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*/
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NS_IMETHOD SetFrameState(nsFrameState aNewState) = 0;
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/**
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* This call is invoked when content is changed in the content tree.
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* The first frame that maps that content is asked to deal with the
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* change by generating an incremental reflow command.
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*
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* @param aIndexInParent the index in the content container where
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* the new content was deleted.
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*/
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NS_IMETHOD ContentChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
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nsISupports* aSubContent) = 0;
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/**
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* This call is invoked when the value of a content objects's attribute
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* is changed.
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* The first frame that maps that content is asked to deal
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* with the change by generating an incremental reflow command.
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*
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* @param aChild the content object
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* @param aAttribute the attribute whose value changed
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*/
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NS_IMETHOD AttributeChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
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nsIAtom* aAttribute,
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PRInt32 aHint) = 0;
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/**
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* Return how your frame can be split.
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*/
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NS_IMETHOD IsSplittable(nsSplittableType& aIsSplittable) const = 0;
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/**
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* Flow member functions. CreateContinuingFrame() is responsible for
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* appending the continuing frame to the flow.
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*/
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NS_IMETHOD CreateContinuingFrame(nsIPresContext& aPresContext,
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nsIFrame* aParent,
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nsIStyleContext* aStyleContext,
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nsIFrame*& aContinuingFrame) = 0;
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NS_IMETHOD GetPrevInFlow(nsIFrame*& aPrevInFlow) const = 0;
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NS_IMETHOD SetPrevInFlow(nsIFrame*) = 0;
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NS_IMETHOD GetNextInFlow(nsIFrame*& aNextInFlow) const = 0;
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NS_IMETHOD SetNextInFlow(nsIFrame*) = 0;
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NS_IMETHOD AppendToFlow(nsIFrame* aAfterFrame) = 0;
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NS_IMETHOD PrependToFlow(nsIFrame* aBeforeFrame) = 0;
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NS_IMETHOD RemoveFromFlow() = 0;
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NS_IMETHOD BreakFromPrevFlow() = 0;
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NS_IMETHOD BreakFromNextFlow() = 0;
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/**
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* Accessor functions to get/set the associated view object
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*/
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NS_IMETHOD GetView(nsIView*& aView) const = 0; // may be null
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NS_IMETHOD SetView(nsIView* aView) = 0;
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/**
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* Find the first geometric parent that has a view
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*/
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NS_IMETHOD GetParentWithView(nsIFrame*& aParent) const = 0;
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/**
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* Returns the offset from this frame to the closest geometric parent that
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* has a view. Also returns the containing view or null in case of error
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*/
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NS_IMETHOD GetOffsetFromView(nsPoint& aOffset, nsIView*& aView) const = 0;
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/**
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* Returns the window that contains this frame. If this frame has a
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* view and the view has a window, then this frames window is
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* returned, otherwise this frame's geometric parent is checked
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* recursively upwards.
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*/
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NS_IMETHOD GetWindow(nsIWidget*&) const = 0;
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/**
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* Is this frame a "containing block"?
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*/
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NS_IMETHOD IsPercentageBase(PRBool& aBase) const = 0;
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/**
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* Gets the size of an "auto" margin.
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*/
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NS_IMETHOD GetAutoMarginSize(PRUint8 aSide, nscoord& aSize) const = 0;
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/**
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* Does this frame have content that is considered "transparent"?
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* This is binary transparency as opposed to translucency. MMP
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*/
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NS_IMETHOD IsTransparent(PRBool& aTransparent) const = 0;
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/**
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* called when the frame has been scrolled to a new
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* position. only called for frames with views.
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*/
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NS_IMETHOD Scrolled(nsIView *aView) = 0;
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// Debugging
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NS_IMETHOD List(FILE* out = stdout, PRInt32 aIndent = 0, nsIListFilter *aFilter = nsnull) const= 0;
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NS_IMETHOD ListTag(FILE* out = stdout) const = 0;
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NS_IMETHOD VerifyTree() const = 0;
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static NS_LAYOUT nsIListFilter * GetFilter(nsString *aFilterName);
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/**
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* See if tree verification is enabled. To enable tree verification add
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* "frameverifytree:1" to your NSPR_LOG_MODULES environment variable
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* (any non-zero debug level will work). Or, call SetVerifyTreeEnable
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* with PR_TRUE.
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*/
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static NS_LAYOUT PRBool GetVerifyTreeEnable();
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/**
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* Set the verify-tree enable flag.
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*/
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static NS_LAYOUT void SetVerifyTreeEnable(PRBool aEnabled);
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/**
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* The frame class and related classes share an nspr log module
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* for logging frame activity.
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*
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* Note: the log module is created during library initialization which
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* means that you cannot perform logging before then.
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*/
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static NS_LAYOUT PRLogModuleInfo* GetLogModuleInfo();
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// Show frame borders when rendering
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static NS_LAYOUT void ShowFrameBorders(PRBool aEnable);
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static NS_LAYOUT PRBool GetShowFrameBorders();
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protected:
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static NS_LAYOUT PRLogModuleInfo* gLogModule;
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private:
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NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
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NS_IMETHOD_(nsrefcnt) Release(void) = 0;
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};
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/* ----- nsIListFilter definition ----- */
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class nsIListFilter
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{
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public:
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virtual PRBool OutputTag(nsAutoString *aTag) const = 0;
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};
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#endif /* nsIFrame_h___ */
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