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The Adobe Experience Manager SDK
There is a newer version: 2024.11.18751.20241128T090041Z-241100
//----------------------------------------------------------------------
//
// File: textdcha.h
//
// Description
//	Public header file for class DispChange
//
//		This is actually a private Text Service class used by the
//		text display to track changes made to the stream
//		(hierarchy).  The display can then use the information here
//		to decide whether it can optimize its regeneration.
//
// Change history
//	Project 	Release Date	Who 	Review	What
//	HawaiiRd	5.0 	960222	RD				Created.
//
//----------------------------------------------------------------------

package com.adobe.xfa.text;

/**
 * @exclude from published api -- Mike Tardif, May 2006.
 */


class DispChange {
	static final int CHANGE_NONE = 0;
	static final int CHANGE_INSERT = 1;
	static final int CHANGE_DELETE = 2;
	static final int CHANGE_FRAME = 3;
	static final int CHANGE_OTHER = 4;
	static final int CHANGE_TO_END = 5;
	static final int CHANGE_FULL = 6;
	static final int CHANGE_FULL_FORCE_FRAMES = 7;

	private TextStream mpoStream;
	private int mnIndex;
	private int mnCount;
	private int meType;
	private boolean mbJustify;

	DispChange () {
		reset();
	}

	final int type () {
		return meType;
	}

	final TextStream stream () {
		return mpoStream;
	}

	final int index () {
		return mnIndex;
	}

	final int count () {
		return mnCount;
	}

	final boolean justify () {
		return mbJustify;
	}

	final void insert (TextStream poStream, int nIndex, int nCount) {
		simpleChange (CHANGE_INSERT, poStream, nIndex, nCount);
	}

	final void delete (TextStream poStream, int nIndex, int nCount) {
		simpleChange (CHANGE_DELETE, poStream, nIndex, nCount);
	}

	final void frame (TextStream poStream, int nIndex, int nCount) {
		simpleChange (CHANGE_FRAME, poStream, nIndex, nCount);
	}
	
	final void other (TextStream poStream, int nIndex, int nCount) {
		if (meType == CHANGE_NONE) {
			meType = CHANGE_OTHER;
			mpoStream = poStream;
			mnIndex = nIndex;
			mnCount = nCount;
		}

		else if ((meType != CHANGE_FULL) && (meType != CHANGE_TO_END) && (poStream == mpoStream)) {
			meType = CHANGE_OTHER;
			int nOldEnd = mnIndex + mnCount;
			int nNewEnd = nIndex + nCount;
			if (nIndex < mnIndex) {
				mnIndex = nIndex;
			}
			if (nNewEnd < nOldEnd) {
				nNewEnd = nOldEnd;
			}
			mnCount = nNewEnd - mnIndex;
		}

		else {
			Full (meType == CHANGE_TO_END);
		}
	}

	final void other (TextStream poStream, int nIndex) {
		other (poStream, nIndex, 0);
	}

	final void toEnd (TextStream poStream, int nIndex) {
		if (meType != CHANGE_NONE) {
			other (poStream, nIndex);
		}

		else if (meType == CHANGE_TO_END) {
			if (poStream == mpoStream) {
				if (nIndex < mnIndex) {
					mnIndex = nIndex;
				}
			}
			else {
				Full (true); // TBD: it would be nice if we could figure out which change came first
			}
		}

		else {
			meType = CHANGE_TO_END;
			mpoStream = poStream;
			mnIndex = nIndex;
			mnCount = 0;
		}
	}

	final void setJustify () {
		mbJustify = true;
	}

	final void Full (boolean bForceAllFrames) {
		meType = bForceAllFrames ? CHANGE_FULL_FORCE_FRAMES : CHANGE_FULL;
	}

	final void full () {
		Full (false);
	}

	final void reset () {
		meType = CHANGE_NONE;
		mpoStream = null;
		mnIndex = 0;
		mnCount = 0;
		mbJustify = false;
	}

	private final void simpleChange (int eType, TextStream poStream, int nIndex, int nCount) {
		if (meType != CHANGE_NONE) {
			other (poStream, nIndex);
		}
		else {
			meType = eType;
			mpoStream = poStream;
			mnIndex = nIndex;
			mnCount = nCount;
		}
	}
}