зеркало из https://github.com/mozilla/pjs.git
267 строки
12 KiB
C++
267 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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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 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIFrameManager_h___
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#define nsIFrameManager_h___
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#include "nsISupports.h"
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#include "nsIStatefulFrame.h"
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#include "nsString.h"
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#include "nsChangeHint.h"
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#include "nsIFrame.h"
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class nsIAtom;
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class nsIContent;
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class nsIPresContext;
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class nsIPresShell;
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class nsIStyleSet;
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class nsStyleContext;
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class nsILayoutHistoryState;
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class nsStyleChangeList;
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class nsPlaceholderFrame;
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#define NS_IFRAMEMANAGER_IID \
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{ 0xa6cf9107, 0x15b3, 0x11d2, \
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{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }
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// Option flags for GetFrameProperty() member function
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#define NS_IFRAME_MGR_REMOVE_PROP 0x0001
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/**
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* Frame manager interface. The frame manager serves two purposes:
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* <li>provides a service for mapping from content to frame and from out-of-flow
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* frame to placeholder frame.
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* <li>handles structural modifications to the frame model. If the frame model
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* lock can be acquired, then the changes are processed immediately; otherwise,
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* they're queued and processed later.
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*/
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class nsIFrameManager : public nsISupports {
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IFRAMEMANAGER_IID)
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// Initialization
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NS_IMETHOD Init(nsIPresShell* aPresShell, nsIStyleSet* aStyleSet) = 0;
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/**
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* After Destroy is called, all methods should return
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* NS_ERROR_NOT_AVAILABLE. Destroy should be called when the
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* frame tree managed by the frame manager is no longer being
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* displayed.
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*/
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NS_IMETHOD Destroy() = 0;
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// Gets and sets the root frame (typically the viewport). The lifetime of the
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// root frame is controlled by the frame manager. When the frame manager is
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// destroyed it destroys the entire frame hierarchy.
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NS_IMETHOD GetRootFrame(nsIFrame** aRootFrame) const = 0;
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NS_IMETHOD SetRootFrame(nsIFrame* aRootFrame) = 0;
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// Get the canvas frame. The canvas frame may or may not exist, so the
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// argument aCanvasFrame may be nsnull.
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NS_IMETHOD GetCanvasFrame(nsIPresContext* aPresContext, nsIFrame** aCanvasFrame) const = 0;
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// Primary frame functions
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NS_IMETHOD GetPrimaryFrameFor(nsIContent* aContent, nsIFrame** aPrimaryFrame) = 0;
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NS_IMETHOD SetPrimaryFrameFor(nsIContent* aContent,
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nsIFrame* aPrimaryFrame) = 0;
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NS_IMETHOD ClearPrimaryFrameMap() = 0;
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// Placeholder frame functions
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NS_IMETHOD GetPlaceholderFrameFor(nsIFrame* aFrame,
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nsIFrame** aPlaceholderFrame) const = 0;
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NS_IMETHOD RegisterPlaceholderFrame(nsPlaceholderFrame *aPlaceholderFrame) = 0;
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NS_IMETHOD UnregisterPlaceholderFrame(nsPlaceholderFrame *aPlaceholderFrame) = 0;
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NS_IMETHOD ClearPlaceholderFrameMap() = 0;
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// Mapping undisplayed content
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virtual nsStyleContext* GetUndisplayedContent(nsIContent* aContent) = 0;
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virtual void SetUndisplayedContent(nsIContent* aContent,
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nsStyleContext* aStyleContext) = 0;
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NS_IMETHOD ClearUndisplayedContentIn(nsIContent* aContent, nsIContent* aParentContent) = 0;
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NS_IMETHOD ClearAllUndisplayedContentIn(nsIContent* aParentContent) = 0;
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NS_IMETHOD ClearUndisplayedContentMap() = 0;
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// Functions for manipulating the frame model
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NS_IMETHOD AppendFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIFrame* aParentFrame,
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nsIAtom* aListName,
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nsIFrame* aFrameList) = 0;
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NS_IMETHOD InsertFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIFrame* aParentFrame,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList) = 0;
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NS_IMETHOD RemoveFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIFrame* aParentFrame,
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nsIAtom* aListName,
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nsIFrame* aOldFrame) = 0;
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NS_IMETHOD ReplaceFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIFrame* aParentFrame,
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nsIAtom* aListName,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame) = 0;
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// Notification that we were unable to render a replaced element
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NS_IMETHOD CantRenderReplacedElement(nsIPresContext* aPresContext,
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nsIFrame* aFrame) = 0;
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// Notification that a frame is about to be destroyed. This allows any outstanding
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// references to the frame to be cleaned up
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NS_IMETHOD NotifyDestroyingFrame(nsIFrame* aFrame) = 0;
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// reparent the style contexts of this frame sub tree to live under the
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// new given parent style context
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NS_IMETHOD ReParentStyleContext(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsStyleContext* aNewParentContext) = 0;
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// Re-resolve style contexts for frame tree
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NS_IMETHOD ComputeStyleChangeFor(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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PRInt32 aAttrNameSpaceID,
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nsIAtom* aAttribute,
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nsStyleChangeList& aChangeList,
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nsChangeHint aMinChange,
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nsChangeHint& aTopLevelChange) = 0;
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// Determine whether an attribute affects style
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NS_IMETHOD HasAttributeDependentStyle(nsIPresContext* aPresContext,
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nsIContent *aContent,
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nsIAtom *aAttribute,
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PRInt32 aModType,
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PRBool *aResult) = 0;
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/**
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* Capture/restore frame state for the frame subtree rooted at aFrame.
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* aState is the document state storage object onto which each frame
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* stores its state.
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*/
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NS_IMETHOD CaptureFrameState(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsILayoutHistoryState* aState) = 0;
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NS_IMETHOD RestoreFrameState(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsILayoutHistoryState* aState) = 0;
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// Add/restore state for one frame (special, global type, like scroll position)
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NS_IMETHOD CaptureFrameStateFor(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsILayoutHistoryState* aState,
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nsIStatefulFrame::SpecialStateID aID = nsIStatefulFrame::eNoID) = 0;
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NS_IMETHOD RestoreFrameStateFor(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsILayoutHistoryState* aState,
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nsIStatefulFrame::SpecialStateID aID = nsIStatefulFrame::eNoID) = 0;
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NS_IMETHOD GenerateStateKey(nsIContent* aContent,
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nsIStatefulFrame::SpecialStateID aID,
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nsACString& aString) = 0;
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/**
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* Gets a property value for a given frame.
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*
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* @param aFrame the frame with the property
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* @param aPropertyName property name as an atom
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* @param aOptions optional flags
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* NS_IFRAME_MGR_REMOVE_PROP removes the property
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* @param aPropertyValue the property value or 0 if the property is not set
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* @return NS_OK if the property is set,
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* NS_IFRAME_MGR_PROP_NOT_THERE if the property is not set
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*/
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NS_IMETHOD GetFrameProperty(nsIFrame* aFrame,
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nsIAtom* aPropertyName,
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PRUint32 aOptions,
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void** aPropertyValue) = 0;
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/**
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* Sets the property value for a given frame.
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*
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* A frame may only have one property value at a time for a given property
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* name. The existing property value (if there is one) is overwritten, and the
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* old value destroyed
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*
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* @param aFrame the frame to set the property on
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* @param aPropertyName property name as an atom
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* @param aPropertyValue the property value
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* @param aPropertyDtorFunc when setting a property you can specify the
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* dtor function (can be NULL) that will be used
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* to destroy the property value. There can be only
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* one dtor function for a given property name
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* @return NS_OK if successful,
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* NS_IFRAME_MGR_PROP_OVERWRITTEN if there is an existing property
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* value that was overwritten,
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* NS_ERROR_INVALID_ARG if the dtor function does not match the
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* existing dtor function
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*/
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NS_IMETHOD SetFrameProperty(nsIFrame* aFrame,
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nsIAtom* aPropertyName,
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void* aPropertyValue,
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NSFramePropertyDtorFunc aPropertyDtorFunc) = 0;
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/**
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* Removes a property and destroys its property value by calling the dtor
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* function associated with the property name.
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*
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* When a frame is destroyed any remaining properties are automatically removed
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*
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* @param aFrame the frame to set the property on
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* @param aPropertyName property name as an atom
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* @return NS_OK if the property is successfully removed,
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* NS_IFRAME_MGR_PROP_NOT_THERE if the property is not set
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*/
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NS_IMETHOD RemoveFrameProperty(nsIFrame* aFrame,
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nsIAtom* aPropertyName) = 0;
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#ifdef NS_DEBUG
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/**
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* DEBUG ONLY method to verify integrity of style tree versus frame tree
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*/
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NS_IMETHOD DebugVerifyStyleTree(nsIPresContext* aPresContext, nsIFrame* aFrame) = 0;
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#endif
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};
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/**
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* Create a frame manager. Upon success, call Init() before attempting to
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* use it.
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*/
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nsresult
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NS_NewFrameManager(nsIFrameManager** aInstancePtrResult);
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#endif /* nsIFrameManager_h___ */
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