RichEditCtrl Syntax Highlighting

Wednesday Jul 28th 1999 by Marc Britten

RichEditCtrl Syntax Highlighting

I wrote this class when I wanted to add syntax highlighting to a utility that I was writing. I had tried the syntax highlighting classes already available from CodeGuru and found each one lacking in some way for the application that I was writing (I was doing some really odd stuff to get it to work)

I cannot take all the credit though, some of the internal logic came from Randy More's Colorize class.

To use this class, simple setup you application to use CRichEditView, then do a search and replace changing CRichEditView to CRichSyntaxView.

If you override OnInitualUpdate I do some initializing there so either call mine yourself of do similar (or nothing if the defaults are good for you)

void CRichSyntaxView::OnInitialUpdate() 
 cf.dwMask = CFM_FACE | CFM_BOLD; 
 cf.dwEffects = 0; 
 strcpy(cf.szFaceName, "Arial"); 
 // Set the printing margins (720 twips = 1/2 inch). 
 SetMargins(CRect(720, 720, 720, 720)); 

Member functions:

bool LoadKeyWordFile(CString word); 
bool LoadKeyWordFile(CStdioFile& file);
Are from the guts of Randy More's control, the CString version calls the STDIO file version with a handle to the file pointed to by the CString

void AddComment(LPCTSTR key); 
void AddKeyWord(LPCTSTR key); 
void AddUserDefined(LPCTSTR key);
Do what they sound like, if you don't want to use a keyword file for simply want a way to give the user the ability to add things, Comments are single line comments, KeyWord, and UserDefined are 2 different COLORREF's with similar logic. This just gives you the ability to diferenciate between 2 different types(ie. C/C++ keywords and MFC keywords)

USER_DEFINED = RGB(100, 100, 0); KEYWORD = RGB(0, 0, 200); COMMENT = RGB(0, 200, 0);
These are the COLOREFS used to set the color of the keywords/symbols. They are initialized by the default constructor as shown

void SetFileName(CString word);
Gives you public access to the protected member sFileName, which is the string used by the OnSave and OnOpen member functions.

void OnSave(); 
void OnOpen();
These are the logic behind the save and restore mechanism. They allow you to save the text in the control to a Rich Text Format file. You need to do any open or save dialogs yourself, they do not work if sFileName.IsEmpty().

void Parse(); 
void ParseRange(int iMin, int iMax);
Causes the contents of the control(or a portion of the contents) to be parsed. Parse() does the whole thing, ParseRange() does a section(between iMin and iMax, iMin does not have to be less than iMax).


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