gecko/layout/base/nsFrameManager.h
2009-12-29 15:13:54 -05:00

232 lines
9.1 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim:cindent:ts=2:et:sw=2:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK *****
*
* This Original Code has been modified by IBM Corporation. Modifications made
* by IBM described herein are Copyright (c) International Business Machines
* Corporation, 2000. Modifications to Mozilla code or documentation identified
* per MPL Section 3.3
*
* Date Modified by Description of modification
* 04/20/2000 IBM Corp. OS/2 VisualAge build.
*/
/* storage of the frame tree and information about it */
#ifndef _nsFrameManager_h_
#define _nsFrameManager_h_
#include "nsIFrame.h"
#include "nsIStatefulFrame.h"
#include "nsChangeHint.h"
#include "nsFrameManagerBase.h"
/**
* Frame manager interface. The frame manager serves two purposes:
* <li>provides a service for mapping from content to frame and from
* out-of-flow frame to placeholder frame.
* <li>handles structural modifications to the frame model. If the frame model
* lock can be acquired, then the changes are processed immediately; otherwise,
* they're queued and processed later.
*
* Do not add virtual methods to this class, or bryner will punish you.
*/
class nsFrameManager : public nsFrameManagerBase
{
public:
nsFrameManager() NS_HIDDEN;
~nsFrameManager() NS_HIDDEN;
void* operator new(size_t aSize, nsIPresShell* aHost) {
NS_ASSERTION(aSize == sizeof(nsFrameManager), "Unexpected subclass");
NS_ASSERTION(aSize == sizeof(nsFrameManagerBase),
"Superclass/subclass mismatch");
return aHost->FrameManager();
}
// Initialization
NS_HIDDEN_(nsresult) Init(nsIPresShell* aPresShell, nsStyleSet* aStyleSet);
/*
* After Destroy is called, it is an error to call any FrameManager methods.
* Destroy should be called when the frame tree managed by the frame
* manager is no longer being displayed.
*/
NS_HIDDEN_(void) Destroy();
/*
* Gets and sets the root frame (typically the viewport). The lifetime of the
* root frame is controlled by the frame manager. When the frame manager is
* destroyed, it destroys the entire frame hierarchy.
*/
NS_HIDDEN_(nsIFrame*) GetRootFrame() { return mRootFrame; }
NS_HIDDEN_(void) SetRootFrame(nsIFrame* aRootFrame)
{
NS_ASSERTION(!mRootFrame, "already have a root frame");
mRootFrame = aRootFrame;
}
/*
* Get the canvas frame, searching from the root frame down.
* The canvas frame may or may not exist, so this may return null.
*/
NS_HIDDEN_(nsIFrame*) GetCanvasFrame();
// Placeholder frame functions
NS_HIDDEN_(nsPlaceholderFrame*) GetPlaceholderFrameFor(nsIFrame* aFrame);
NS_HIDDEN_(nsresult)
RegisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
NS_HIDDEN_(void)
UnregisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
NS_HIDDEN_(void) ClearPlaceholderFrameMap();
// Mapping undisplayed content
NS_HIDDEN_(nsStyleContext*) GetUndisplayedContent(nsIContent* aContent);
NS_HIDDEN_(void) SetUndisplayedContent(nsIContent* aContent,
nsStyleContext* aStyleContext);
NS_HIDDEN_(void) ChangeUndisplayedContent(nsIContent* aContent,
nsStyleContext* aStyleContext);
NS_HIDDEN_(void) ClearUndisplayedContentIn(nsIContent* aContent,
nsIContent* aParentContent);
NS_HIDDEN_(void) ClearAllUndisplayedContentIn(nsIContent* aParentContent);
NS_HIDDEN_(void) ClearUndisplayedContentMap();
// Functions for manipulating the frame model
NS_HIDDEN_(nsresult) AppendFrames(nsIFrame* aParentFrame,
nsIAtom* aListName,
nsFrameList& aFrameList)
{
return aParentFrame->AppendFrames(aListName, aFrameList);
}
NS_HIDDEN_(nsresult) InsertFrames(nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList);
NS_HIDDEN_(nsresult) RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame);
/*
* Notification that a frame is about to be destroyed. This allows any
* outstanding references to the frame to be cleaned up.
*/
NS_HIDDEN_(void) NotifyDestroyingFrame(nsIFrame* aFrame);
/*
* Reparent the style contexts of this frame subtree. The parent frame of
* aFrame must be changed to the new parent before this function is called;
* the new parent style context will be automatically computed based on the
* new position in the frame tree.
*
* @param aFrame the root of the subtree to reparent. Must not be null.
*/
NS_HIDDEN_(nsresult) ReParentStyleContext(nsIFrame* aFrame);
/*
* Re-resolve the style contexts for a frame tree, building
* aChangeList based on the resulting style changes, plus aMinChange
* applied to aFrame.
*/
NS_HIDDEN_(void)
ComputeStyleChangeFor(nsIFrame* aFrame,
nsStyleChangeList* aChangeList,
nsChangeHint aMinChange);
// Determine whether an attribute affects style
// If aAttrHasChanged is false, the attribute's value is about to
// change. If it's true, it has already changed.
NS_HIDDEN_(nsReStyleHint) HasAttributeDependentStyle(nsIContent *aContent,
nsIAtom *aAttribute,
PRInt32 aModType,
PRBool aAttrHasChanged);
/*
* Capture/restore frame state for the frame subtree rooted at aFrame.
* aState is the document state storage object onto which each frame
* stores its state.
*/
NS_HIDDEN_(void) CaptureFrameState(nsIFrame* aFrame,
nsILayoutHistoryState* aState);
NS_HIDDEN_(void) RestoreFrameState(nsIFrame* aFrame,
nsILayoutHistoryState* aState);
/*
* Add/restore state for one frame
* (special, global type, like scroll position)
*/
NS_HIDDEN_(void) CaptureFrameStateFor(nsIFrame* aFrame,
nsILayoutHistoryState* aState,
nsIStatefulFrame::SpecialStateID aID =
nsIStatefulFrame::eNoID);
NS_HIDDEN_(void) RestoreFrameStateFor(nsIFrame* aFrame,
nsILayoutHistoryState* aState,
nsIStatefulFrame::SpecialStateID aID =
nsIStatefulFrame::eNoID);
#ifdef NS_DEBUG
/**
* DEBUG ONLY method to verify integrity of style tree versus frame tree
*/
NS_HIDDEN_(void) DebugVerifyStyleTree(nsIFrame* aFrame);
#endif
NS_HIDDEN_(nsIPresShell*) GetPresShell() const { return mPresShell; }
NS_HIDDEN_(nsPresContext*) GetPresContext() const {
return mPresShell->GetPresContext();
}
private:
NS_HIDDEN_(nsChangeHint)
ReResolveStyleContext(nsPresContext *aPresContext,
nsIFrame *aFrame,
nsIContent *aParentContent,
nsStyleChangeList *aChangeList,
nsChangeHint aMinChange,
PRBool aFireAccessibilityEvents);
};
#endif