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- /* -*- 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.
- */
-
- #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();
-
- // Primary frame functions
- NS_HIDDEN_(nsIFrame*) GetPrimaryFrameFor(nsIContent* aContent);
- NS_HIDDEN_(nsresult) SetPrimaryFrameFor(nsIContent* aContent,
- nsIFrame* aPrimaryFrame);
- NS_HIDDEN_(void) ClearPrimaryFrameMap();
-
- // 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,
- nsIFrame* aFrameList)
- {
- return aParentFrame->AppendFrames(aListName, aFrameList);
- }
-
- NS_HIDDEN_(nsresult) InsertFrames(nsIFrame* aParentFrame,
- nsIAtom* aListName,
- nsIFrame* aPrevFrame,
- nsIFrame* aFrameList);
-
- NS_HIDDEN_(nsresult) RemoveFrame(nsIFrame* aParentFrame,
- nsIAtom* aListName,
- nsIFrame* aOldFrame);
-
- NS_HIDDEN_(nsresult) ReplaceFrame(nsIFrame* aParentFrame,
- nsIAtom* aListName,
- nsIFrame* aOldFrame,
- nsIFrame* aNewFrame)
- {
- return aParentFrame->ReplaceFrame(aListName, aOldFrame, aNewFrame);
- }
-
- /*
- * 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 to live under the new
- * given parent style context. The StyleContextParent of aFrame should be
- * changed _before_ this method is called, so that style tree verification
- * can take place correctly.
- */
- NS_HIDDEN_(nsresult) ReParentStyleContext(nsIFrame* aFrame,
- nsStyleContext* aNewParentContext);
-
- /*
- * Re-resolve the style contexts for a frame tree. Returns the top-level
- * change hint resulting from the style re-resolution.
- */
- NS_HIDDEN_(nsChangeHint)
- ComputeStyleChangeFor(nsIFrame* aFrame,
- nsStyleChangeList* aChangeList,
- nsChangeHint aMinChange);
-
- // Determine whether an attribute affects style
- NS_HIDDEN_(nsReStyleHint) HasAttributeDependentStyle(nsIContent *aContent,
- nsIAtom *aAttribute,
- PRInt32 aModType);
-
- /*
- * 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
-
- private:
-
- NS_HIDDEN_(nsIPresShell*) GetPresShell() const { return mPresShell; }
- NS_HIDDEN_(nsPresContext*) GetPresContext() const {
- return mPresShell->GetPresContext();
- }
-
- NS_HIDDEN_(nsChangeHint)
- ReResolveStyleContext(nsPresContext *aPresContext,
- nsIFrame *aFrame,
- nsIContent *aParentContent,
- nsStyleChangeList *aChangeList,
- nsChangeHint aMinChange);
- };
-
- #endif
-