How to save specific part of a TRichEdit text RTF (c++ codegear) - c++

Question

I'm creating a search features in an existing c++ CodeGear project.
When you double-click a word, the background of all occurrences of the word is paint in green like in notepad++.
Before color is applied, I'm saving the original TRichEDit text in a TMemoryStream to be able to get the original text back. I reset the color back to normal on click event in the TRichEdit.
I would like to know if there is a way to save each occurrence of the search word in a TMemoryStream or maybe by using a Message like EM_STREAMOUT?
Right now everything works fine, but when the TRichEdit text is too big, it takes forever to reload the big memo of all the text. I think it would be better to only remember the color of the word that changed rather then reload all the text.
I'm really a beginner in programming, any help is appreciate. Tell me if it's not clear enough.
Here is my code that is working and putting background color to occurrences of word:
`
void SearchInText::searchWordInText(TRichEdit* reTextToSearch, AnsiString strWordToFind)
{
lstOccurrences->Clear(); //reset lst
strTextToParse = AnsiReplaceText(strTextToParse, "\r\n", "\n");
int nPrevTagPos = 0;
int nTagPos = strTextToParse.AnsiPos(strWordToFind);
while (nTagPos != 0)
{
int nPosMin = nPrevTagPos + nTagPos - 1;
//List of all the occurrence in the TRichEdit with their position in the text
//It's not a list of int, but it POINT to adresses of INT so it's the same result =)
lstOccurrences->Add((TObject*) nPosMin);
//Change color of background when there is an occurrence
changeBgColor(reTextToSearch, strWordToFind, nPosMin +1, 155, 255, 155); //lime
bColorWasApplied = true;
nPrevTagPos = nPosMin + strWordToFind.Length();
strTextToParse = strTextToParse.SubString(nTagPos + strWordToFind.Length(), strTextToParse.Length());
nTagPos = strTextToParse.AnsiPos(strWordToFind);
}
}
`

Answer 1

Try something like this:
#include <vector>
struct WordOccurrence
{
CHARRANGE Range;
CHARFORMAT2 OriginalFormat;
};
std::vector<WordOccurrence> WordOccurrences;
void TMyForm::HighlightWords(const String &WordToFind)
{
// disable the RichEdit's notification messages
int OriginalEventMask = RichEdit1->Perform(EM_SETEVENTMASK, 0, 0);
// disable the RichEdit's painting
RichEdit1->Perform(WM_SETREDRAW, FALSE, 0);
// save the RichEdit's current selection
CHARRANGE OriginalSelection;
RichEdit1->Perform(EM_EXGETSEL, 0, (LPARAM)&OriginalSelection);
// assign values to use while searching
int WordLen = WordToFind.Length();
int TextLen = RichEdit1->GetTextLen();
TSearchTypes SearchTypes = TSearchTypes() << stWholeWord << stMatchCase;
// find the first occurrence of the word
int StartPos = RichEdit1->FindText(WordToFind, 0, TextLen, SearchTypes);
while (StartPos != -1)
{
WordOccurrence Occurrence;
Occurrence.Range.cpMin = StartPos;
Occurrence.Range.cpMax = StartPos + WordLen;
// select the word
RichEdit1->Perform(EM_EXSETSEL, 0, (LPARAM)&Occurrence.Range);
// get the word's current formatting
Occurrence.OriginalFormat.cbSize = sizeof(CHARFORMAT2);
RichEdit1->Perform(EM_GETCHARFORMAT, SCF_SELECTION, (LPARAM)&Occurrence.OriginalFormat);
// save it for later
WordOccurrences.push_back(Occurrence);
// set the word's new formatting
CHARFORMAT2 NewFormat = Occurrence.OriginalFormat;
NewFormat.dwMask |= (CFM_COLOR | CFM_BACKCOLOR);
NewFormat.crTextColor = ...;
newFormat.crBackColor = ...;
RichEdit1->Perform(EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM)&NewFormat);
// find the next occurrence of the word
StartPos = RichEdit1->FindText(WordToFind, Occurrence.Range.cpMax, TextLen - Occurence.Range.cpMax, SearchTypes);
}
// restore the RichEdit's original selection
RichEdit1->Perform(EM_EXSETSEL, 0, (LPARAM)&OriginalSelection);
// re-enable the RichEdit's painting
RichEdit1->Perform(WM_SETREDRAW, TRUE, 0);
RichEdit1->Invalidate();
// re-enable the RichEdit's notification messages
RichEdit1->Perform(EM_SETEVENTMASK, 0, OriginalEventMask);
}
void TMyForm::RestoreHighlightedWords()
{
// are there any occurrences to restore?
if (WordOccurances.empty())
return;
// disable the RichEdit's notification messages
int OriginalEventMask = RichEdit1->Perform(EM_SETEVENTMASK, 0, 0);
// disable the RichEdit's painting
RichEdit1->Perform(WM_SETREDRAW, FALSE, 0);
// save the RichEdit's current selection
CHARRANGE OriginalSelection;
RichEdit1->Perform(EM_EXGETSEL, 0, (LPARAM)&OriginalSelection);
// restore the formatting of each occurrence
for (std::vector<WordOccurrence>::iterator iter = WordOccurrences.begin();
iter != WordOccurrences.end();
++iter)
{
WordOccurrence &occurrence = *iter;
// select the word
RichEdit1->Perform(EM_EXSETSEL, 0, (LPARAM)&occurrence.Range);
// restore the word's original formatting
RichEdit1->Perform(EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM)&occurrence.OriginalFormat);
}
// clear the list
WordOccurances.clear();
// restore the RichEdit's original selection
RichEdit1->Perform(EM_EXSETSEL, 0, (LPARAM)&OriginalSelection);
// re-enable the RichEdit's painting
RichEdit1->Perform(WM_SETREDRAW, TRUE, 0);
RichEdit1->Invalidate();
// re-enable the RichEdit's notification messages
RichEdit1->Perform(EM_SETEVENTMASK, 0, OriginalEventMask);
}

Answer 2

Ok, so I finally get it!
I add a struct in my .h
Inside it, I store:
-the position in the TRichEdit of the word found (nStart)
-the length of the word (nLength)
-the actual text and his RTF
struct sSelectedWord : public TObject
{
public:
__fastcall ~sSelectedWord(); //destructor
int nStart;
int nLength;
TMemoryStream* memoRTF;
};
Here is the code that save the RTF of my TRichEdit in my struct I just created in the .h.
void SearchInText::searchWordInText(TRichEdit* reTextToSearch, AnsiString strWordToFind)
{
lstOccurrences->Clear(); //reset lst
lstOccWithRTFMemo->Clear();
nCountOccurrence = 0;
strTextToParse = AnsiReplaceText(strTextToParse, "\r\n", "\n");
int nPrevTagPos = 0;
int nTagPos = strTextToParse.AnsiPos(strWordToFind);
while (nTagPos != 0)
{
int nPosMin = nPrevTagPos + nTagPos - 1;
//List of all the occurrence in the TRichEdit with their position in the text
//It's not a list of int, but it POINT to adresses of INT so it's the same result =)
lstOccurrences->Add((TObject*) nPosMin);
nCountOccurrence++;
//selected the word in the TRichEdit to save it with is RTF
reTextToSearch->SelStart = nPosMin;
reTextToSearch->SelLength = strWordToFind.Length();
TMemoryStream* memo = new TMemoryStream;
//important part!
rtfSaveStream(reTextToSearch,memo);
sSelectedWord* currentWord = new sSelectedWord;
currentWord->nStart = nPosMin;
currentWord->nLength = strWordToFind.Length();
currentWord->memoRTF = memo;
//Here we go, we add our new object in a list to be able to loop through it when we will want to reset the color
lstOccWithRTFMemo->Add(currentWord);
lstOccWithRTFMemo->Count;
//Change color of background when there is an occurrence
changeBgColor(reTextToSearch, strWordToFind, nPosMin +1, 155, 255, 155); //lime
bColorWasApplied = true;
nPrevTagPos = nPosMin + strWordToFind.Length();
strTextToParse = strTextToParse.SubString(nTagPos + strWordToFind.Length(), strTextToParse.Length());
nTagPos = strTextToParse.AnsiPos(strWordToFind);
}
}
The important part was done with the EM_STREAMOUT message.
void SearchInText::rtfSaveStream(TRichEdit* re, TMemoryStream* memo)
{
// Create an instance of an EDITSTREAM that will contain:
// - The detail of our callback (StreamInCallback)
// - The TMemoryStream that contains the text to paste
EDITSTREAM es = {0};
ZeroMemory(&es, sizeof(es));
es.dwCookie = (DWORD_PTR) memo;
es.dwError = 0;
es.pfnCallback = &StreamSaveInCallback ; //pointer to function callBack
//To save the selected word of the TRichEdit, use STREAMOUT
re->Perform(EM_STREAMOUT, SF_RTF | SFF_SELECTION, (LPARAM)&es);
}
DWORD CALLBACK SearchInText::StreamSaveInCallback(DWORD_PTR dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)
{
TMemoryStream *memo = (TMemoryStream*)dwCookie;
memo->Write(pbBuff, cb);
*pcb = cb;
return 0;
}
In the pbuff, you can see the word that you selected in your TRichEdit with his RTF!
Hope it will help others with the same issue! Thanks for those who suggested code =)