author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Wed, 15 Sep 2010 14:10:32 +0300 | |
branch | RCL_3 |
changeset 65 | 795cadd2b83a |
parent 0 | 1fb32624e06b |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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|
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|
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#include <tagma.h> |
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#include <bidi.h> |
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#include "tmreformat.h" |
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/** |
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Create a new reformat object, leaving it on the cleanup stack. |
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|
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@param aTextLayout The text layout object that is looking after the document that needs reformatting. |
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We use this to query the existing formatted range. |
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@param aFormatParam Restrictions on the formatting operation |
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@param aReformatParam Information about the reformat operation: which section of the document has changed |
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*/ |
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CTmReformat* CTmReformat::NewLC(CTmTextLayout& aTextLayout, const TTmFormatParamBase& aFormatParam, |
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const TTmReformatParam& aReformatParam) |
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{ |
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CTmReformat* self = new(ELeave) CTmReformat(aTextLayout, aFormatParam, aReformatParam); |
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CleanupStack::PushL(self); |
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self->ConstructL(); |
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return self; |
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} |
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CTmReformat::CTmReformat(CTmTextLayout& aTextLayout, const TTmFormatParamBase& aFormatParam, |
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const TTmReformatParam& aReformatParam) |
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:iTextLayout(aTextLayout), iFormatParam(aFormatParam), |
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iReformatParam(aReformatParam) |
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{ |
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} |
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void CTmReformat::ConstructL() |
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{ |
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iOldStartBDContext = new(ELeave) TBidirectionalContext; |
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iOldEndBDContext = new(ELeave) TBidirectionalContext; |
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iNewEndBDContext= new(ELeave) TBidirectionalContext; |
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iNewCode = new(ELeave) CTmCode; |
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} |
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CTmReformat::~CTmReformat() |
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{ |
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delete iOldStartBDContext; |
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delete iOldEndBDContext; |
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delete iNewEndBDContext; |
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delete iNewCode; |
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} |
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/** |
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Generate the new bytecode to be spliced into the text layout's bytecode. |
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First it will generate new code for the section of document containing the actual edit, plus a line |
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either side (with the exception of two special cases where it's explicitly told to reformat whole |
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paragraphs). |
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|
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Then it will look at the resulting bytecode, and: |
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- if the edit has changed bidirectional state above the new code, it will extend the edit upwards |
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to the start of the paragraph containing it |
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- if the edit has changed line endings or bidirectional state below the new code, then it will extend |
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the edit downwards to the end of the paragraph containing it |
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The exception to this is: |
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- if the current formatted band ends in the middle of a paragraph and the edit would extend |
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to the end of the current formatted band, we will abandon any attempt to generate new |
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bytecode, effectively telling the caller to delete everything from the start of the edit to the end |
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of the band. The reason for this is that otherwise we run the risk of generating partial lines. |
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Once this function has been called, the caller can get the new bytecode and information about the |
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range it occupies and the range it replaces. |
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*/ |
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void CTmReformat::ReformatL() |
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{ |
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TBool formatToParagraphStart = EFalse; |
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TBool formatToParagraphEnd = EFalse; |
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if(iReformatParam.iParInvalid) |
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{ |
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formatToParagraphEnd = ETrue; |
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} |
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if(iReformatParam.iParFormatChanged) |
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{ |
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formatToParagraphStart = ETrue; |
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formatToParagraphEnd = ETrue; |
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} |
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GetReformatRangeL(formatToParagraphStart, formatToParagraphEnd); |
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GenerateNewCodeL(formatToParagraphStart, formatToParagraphEnd); |
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104 |
TBool extendReformatRange = EFalse; |
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if((!ReformatRangeExtendsToParagraphStart()) && (BidirectionalityChangedAtStart())) |
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106 |
{ |
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formatToParagraphStart = ETrue; |
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extendReformatRange = ETrue; |
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109 |
} |
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if((!ReformatRangeExtendsToParagraphEnd()) && |
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(LineEndingsChangedAtEnd() || (BidirectionalityChangedAtEnd()))) |
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112 |
{ |
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formatToParagraphEnd = ETrue; |
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extendReformatRange = ETrue; |
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} |
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if(BidirectionalityChangedAtStart() || BidirectionalityChangedAtEnd()) |
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117 |
{ |
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iBidirectionalStateChanged = ETrue; |
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} |
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if (extendReformatRange) |
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121 |
{ |
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GetReformatRangeL(formatToParagraphStart, formatToParagraphEnd); |
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GenerateNewCodeL(formatToParagraphStart, formatToParagraphEnd); |
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} |
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125 |
} |
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126 |
|
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127 |
/** |
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Returns the bytecode we generated. This must be spliced into CTmTextLayout's current bytecode. |
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129 |
*/ |
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CTmCode& CTmReformat::NewCode() |
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131 |
{ |
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return *iNewCode; |
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133 |
} |
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134 |
|
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135 |
/** |
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This structure gives the caller information about the range to be replaced by the section of bytecode |
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we just generated. |
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138 |
|
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For example, if we have a document and delete a section of it, this function will give us information |
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about the position and dimensions of the deleted section. |
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141 |
*/ |
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const CTmFormatContext::TInfo& CTmReformat::FormatInfo() const |
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143 |
{ |
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return iFormatInfo; |
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} |
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146 |
|
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147 |
/** |
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This structure gives the caller information about the section of bytecode we just generated. |
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149 |
|
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150 |
For example, if we have a document and delete a section of it, this function will give us information |
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151 |
about the position of the deleted section. If we inserted some text, it will also tells us the |
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dimensions of the new text. |
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*/ |
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const TTmByteCodeFinder::TInfo& CTmReformat::ReformatRange() const |
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{ |
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return iReformatRange; |
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} |
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158 |
|
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/** |
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This function uses iReformatParam to get information about the section of the document to reformat. |
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Its operation is also parameterised by aToParagraphStart and aToParagraphEnd, which tell it whether |
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to extend the range it retrieves to the start and/or end of the paragraph containing the start/end |
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of the edit. |
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*/ |
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void CTmReformat::GetReformatRangeL(TBool aToParagraphStart, TBool aToParagraphEnd) |
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166 |
{ |
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//by default, the range is just the stuff that's been edited |
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TInt startChar = iReformatParam.iStartChar; |
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TInt endChar = iReformatParam.iStartChar + iReformatParam.iOldLength; |
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//get the range into iReformatRange |
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TTmInterpreterParam interpreterParam(iTextLayout); |
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TTmByteCodeFinder finder(interpreterParam, startChar, endChar); |
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TInt max_extra_lines = aToParagraphEnd ? iReformatParam.iMaxExtraLines : KMaxTInt; |
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if (!finder.FindByteCode(aToParagraphStart, aToParagraphEnd, max_extra_lines, iReformatRange, iOldStartBDContext, iOldEndBDContext)) |
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175 |
{ |
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TmPanic(EFormatNotFound); |
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} |
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} |
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179 |
|
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void CTmReformat::GenerateNewCodeL(TBool aToParagraphStart, TBool aToParagraphEnd) |
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181 |
{ |
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TTmFormatParam formatParam(iFormatParam); |
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formatParam.iStartChar = iReformatRange.iStartInfo.iStart; |
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formatParam.iEndChar = iReformatRange.iEndInfo.iEnd + iReformatParam.iNewLength - iReformatParam.iOldLength; |
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formatParam.iLineInPar = iReformatRange.iStartInfo.iLineInPar; |
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iNewCode->Reset(); |
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/* |
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188 |
If we were asked to format to the end of the paragraph, |
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189 |
but the end of the reformat range does not actually end on a paragraph boundary, |
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190 |
then we should abandon the reformat, effectively marking all the text after the |
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191 |
edit start as invalid, and regenerating the bytecode afresh from the document source. |
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192 |
|
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193 |
This is because otherwise, under such conditions, we we risk formatting a partial |
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line at the end of the range. |
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195 |
|
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196 |
To do this we: |
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- set iReformatRange (which represents the section of bytecode to be replaced) to extend |
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198 |
from the start of the edit range to the end of the formatted range |
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199 |
- set iFormatInfo (which represents the section of bytecode with which to replace iReformatRange |
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200 |
to have an extent of zero |
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201 |
|
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202 |
Then the calling code will replace iReformatRange with iFormatInfo, as usual, and thus will |
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203 |
effectively delete everything after the start of the edit. Then it will add new sections of |
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204 |
formatting from the document source to ensure we have enough to fill the visible band |
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205 |
*/ |
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//set extent of iFormatInfo to zero |
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iFormatInfo.iWidth = 0; |
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iFormatInfo.iHeight = 0; |
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iFormatInfo.iFirstLineEndChar = iReformatRange.iStartInfo.iStart; |
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iFormatInfo.iLastLineStartChar = iReformatRange.iStartInfo.iStart; |
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iFormatInfo.iEndChar = iReformatRange.iStartInfo.iStart; |
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// Set the context character for this line from the previous line found in the byte code. |
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// This is then passed on the the CTmFormatContext::FormatL() function to be stored in the CTmTextLayout object. |
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// Every new line that is about to be formatted/reformatted takes the context from CTmTextLayout. |
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iFormatInfo.iContextCharPerLine = iReformatRange.iContextCharPerLine; |
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//set the new BD state at end == the BD state at the start of the old reformat range |
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*iNewEndBDContext = *iOldStartBDContext; |
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if ((aToParagraphEnd || (iReformatRange.iEndInfo.iEnd == iTextLayout.EndChar())) |
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&& (!ReformatRangeExtendsToParagraphEnd())) |
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220 |
{ |
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//set iReformatRange to extend from edit start to end of formatted band |
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TTmInterpreterParam interpreterParam(iTextLayout); |
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TTmByteCodeFinder finder(interpreterParam, iReformatParam.iStartChar, iTextLayout.EndChar()-1); |
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if (!finder.FindByteCode(aToParagraphStart, EFalse, KMaxTInt, iReformatRange, NULL, NULL)) |
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225 |
{ |
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TmPanic(EFormatNotFound); |
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} |
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} |
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229 |
else |
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230 |
{ |
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CTmFormatContext::FormatL(*(iTextLayout.Source()), formatParam, *iNewCode, iFormatInfo,&iTextLayout, |
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iOldStartBDContext, iNewEndBDContext, &iEndOfPreviousLine); |
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//if we actually did format to the end of a paragraph, |
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//the new bidirectional state is the default |
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if(ReformatRangeExtendsToParagraphEnd()) |
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236 |
{ |
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iNewEndBDContext->Reset(); |
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} |
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239 |
} |
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240 |
} |
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241 |
|
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TBool CTmReformat::BidirectionalStateChanged() |
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243 |
{ |
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return iBidirectionalStateChanged; |
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} |
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246 |
|
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/** |
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248 |
Tells us whether the edit changed the bidirectional state before the edit point. |
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*/ |
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TBool CTmReformat::BidirectionalityChangedAtStart() |
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{ |
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return !(iOldStartBDContext->ContextMatches(iEndOfPreviousLine)); |
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} |
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254 |
|
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/** |
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256 |
Returns the bidirectional state at the end of the newly generated bytecode |
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*/ |
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const TBidirectionalContext& CTmReformat::BidirectionalStateAtEnd() const |
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{ |
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return *iNewEndBDContext; |
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} |
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262 |
|
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/** |
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Tells us whether the edit changed the bidirectional state after the edit point. |
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*/ |
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TBool CTmReformat::BidirectionalityChangedAtEnd() |
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{ |
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return !(*(iNewEndBDContext) == *(iOldEndBDContext)); |
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} |
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270 |
|
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271 |
/** |
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272 |
Tells us whether the start of the range to replace is on a paragraph boundary. |
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*/ |
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274 |
TBool CTmReformat::ReformatRangeExtendsToParagraphStart() const |
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275 |
{ |
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return iReformatRange.iStartInfo.iFlags & TTmLineInfo::EParStart; |
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} |
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278 |
|
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279 |
/** |
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280 |
Tells us whether the end of the range to replace is on a paragraph boundary. |
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281 |
*/ |
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282 |
TBool CTmReformat::ReformatRangeExtendsToParagraphEnd() const |
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283 |
{ |
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return iReformatRange.iEndInfo.iFlags & TTmLineInfo::EParEnd; |
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285 |
} |
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286 |
|
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287 |
/** |
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288 |
Tells us whether line endings after the edit point have changed. |
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289 |
|
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290 |
The algorithm here is a bit non-obvious. It is: |
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- take the first character position of the last line in the reformatted range, before the reformat |
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-plus the difference between the new size and the old size |
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293 |
-compare to the new character position of the last line in the range |
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294 |
|
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295 |
For example, suppose this is the contents of the band: |
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296 |
|
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line 1: t h s i s |
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position: 1 2 3 4 5 |
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299 |
|
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line 2: a t e s t |
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position: 6 7 8 9 10 |
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302 |
|
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-line 2 start position == 6 |
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304 |
|
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305 |
-now insert an "i" at position 3 |
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306 |
|
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-suppose this does not change the format of line 2: |
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308 |
|
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line 1: t h i s i s |
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position: 1 2 3 4 5 6 |
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|
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line 2: a t e s t |
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position: 7 8 9 10 11 |
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|
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-line 2 new start position ==7 |
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|
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(old line2 start) + ((new length)-(old length)) = 6 + (1-0) = 7 = new start position |
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|
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-suppose it does change the format of line 2, by pushing the last char off the end of line 1: |
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|
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line 1: t h i s i |
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position: 1 2 3 4 5 |
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|
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line 2: s a t e s t |
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position: 6 7 8 9 10 11 |
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|
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-line 2 new start position ==6 |
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|
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(old line2 start) + ((new length)-(old length)) = 6 + (1-0) = 7 != new start position |
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*/ |
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TBool CTmReformat::LineEndingsChangedAtEnd() const |
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{ |
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TInt lastLineStartCharBeforeEdit = |
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iReformatRange.iEndInfo.iStart + iReformatParam.iNewLength - iReformatParam.iOldLength; |
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return lastLineStartCharBeforeEdit != iFormatInfo.iLastLineStartChar; |
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} |
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337 |