зеркало из https://github.com/mozilla/gecko-dev.git
117 строки
3.8 KiB
C++
117 строки
3.8 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 nsIReflowCommand_h___
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#define nsIReflowCommand_h___
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#include "nsISupports.h"
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class nsIFrame;
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class nsIPresContext;
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struct nsReflowMetrics;
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struct nsSize;
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// IID for the nsIReflowCommand interface {C3658E40-FF20-11d1-85BC-00A02468FAB6}
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#define NS_IREFLOWCOMMAND_IID \
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{ 0xc3658e40, 0xff20, 0x11d1, \
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{0x85, 0xbc, 0x0, 0xa0, 0x24, 0x68, 0xfa, 0xb6}}
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/**
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* A reflow command is an object that is generated in response to a content
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* model change notification. The reflow command is given to a presentation
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* shell where it is queued and then dispatched by invoking the reflow
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* commands's Dispatch() member function.
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*
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* Reflow command processing follows a path from the root frame down to the
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* target frame (the frame for which the reflow command is destined). Reflow
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* commands are processed by invoking the frame's Reflow() member function.
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*
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* @see nsIFrame#ContentAppended()
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* @see nsIFrame#ContentChanged()
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* @see nsIFrame#ContentDeleted()
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* @see nsIFrame#ContentInserted()
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* @see nsIFrame#ContentReplaced()
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* @see nsIPresShell#AppendReflowCommand()
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* @see nsIPresShell#ProcessReflowCommands()
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*/
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class nsIReflowCommand : public nsISupports {
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public:
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enum ReflowType {
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// Reflow commands generated in response to a content insert/delete/append
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// notification. The target of the reflow command is the container frame
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// itself
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FrameAppended,
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FrameInserted,
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FrameDeleted,
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// This reflow command is used when a leaf node's content changes (e.g. some
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// text in a text run, an image's source, etc.). The target of the reflow
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// command is the frame that changed (see nsIFrame#ContentChanged() for how
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// the target frame is determined).
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ContentChanged,
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// When an incremental reflow operation affects a next-in-flow,
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// these commands are used to get the next-in-flow to update
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// itself.
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PullupReflow,
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PushReflow,
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// This command is used to see if a prev-in-flow wants to pullup
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// some children from a next-in-flow that has changed because of
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// an incremental reflow.
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CheckPullupReflow,
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// Trap door for extensions
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UserDefined
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};
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/**
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* Dispatch the reflow command.
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*
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* Builds a path from the target frame back to the root frame, and then
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* invokes the root frame's Reflow() member function.
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*
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* @see nsIFrame#Reflow()
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*/
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NS_IMETHOD Dispatch(nsIPresContext& aPresContext,
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nsReflowMetrics& aDesiredSize,
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const nsSize& aMaxSize) = 0;
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/**
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* Get the next frame in the command processing path. Note that this removes
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* the frame from the path so you must only call it once.
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*/
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NS_IMETHOD GetNext(nsIFrame*& aNextFrame) = 0;
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/**
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* Get the target of the reflow command.
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*/
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NS_IMETHOD GetTarget(nsIFrame*& aTargetFrame) const = 0;
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/**
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* Get the type of reflow command.
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*/
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NS_IMETHOD GetType(ReflowType& aReflowType) const = 0;
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/**
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* Get the child frame associated with the reflow command.
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*/
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NS_IMETHOD GetChildFrame(nsIFrame*& aChildFrame) const = 0;
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};
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#endif /* nsIReflowCommand_h___ */
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