Append Formatted Lines Using SelText and SelStart

The TRichEdit Delphi control is a wrapper for a Windows rich text edit control. You can use a Rich Edit control to display and edit RTF files. While you can create nice user interface around the Rich Edit control with toolbar buttons to set and change text display attributes, adding formatted lines to Rich Edit programmatically is fairly cumbersome - as you will see. How to Add Formatted Lines to Rich Edit To create bold text from a selection of text displayed in the Rich Edit control, at runtime, you need to make a section of text and then set the selections properties to SelAttributes. However, what if youre not dealing with a selection of text and instead want to add (append) formatted text to a Rich Edit control? You might think Lines property can be used to add bold or colored text to Rich Edit. However, Lines is a simple TStrings and will accept only plain, unformatted text. Dont give up - of course, theres a solution. Look at this example for some help: //richEdit1 of type TRichEdit with richEdit1 do begin //move caret to end SelStart : GetTextLen; //add one unformatted line SelText : This is the first line #13#10; //add some normal font text SelText : Formatted lines in RichEdit #13#10; //bigger text SelAttributes.Size : 13; //add bold red SelAttributes.Style : [fsBold]; SelAttributes.Color : clRed; SelText : About; //only bold SelAttributes.Color : clWindowText; SelText : Delphi ; //add italic blue SelAttributes.Style : [fsItalic]; SelAttributes.Color : clBlue; SelText : Programming; //new line SelText : #13#10; //add normal again SelAttributes.Size : 8; SelAttributes.Color : clGreen; SelText : think of AddFormattedLine custom procedure...; end; To start, move the caret to the end of the text in the Rich Edit. Then, apply formatting before you actually append the new text.