Re: selection

Return to index

Author

Message

Sergey Tkachenko

Posted: 03/10/2002 19:13:42

In Igor Afanasyev's TSyntaxRichViewEdit (a component descended from

TRichViewEdit)

http://www.trichview.com/resources/syntax/syntaxrichviewedit.zip

there are methods converting RichView coordinates to "absolute" RichEdit

coordinates and back:

    function ItemOffsToAbs(aItemNo, aOffs : integer) : integer;

    procedure AbsToItemOffs(aPos : integer; var aItemNo, aOffs : integer);

    procedure GetSelBounds(var aStart, aEnd : integer; var Inverted :

boolean);

    procedure SetSelBounds(aStart, aEnd : integer; Inverted : boolean);

    function GetSelStart : integer;

    function GetSelEnd : integer;

    function GetSelLength : integer;

    procedure SetSelLength(aLen : integer);

    function GetAbsCaretPos : integer;

    procedure SetAbsCaretPos(aPos : integer)

You can take implementations of these methos from there.

Disclaimer: I did not test these methods thoroughly myself.

These methods include calculations and may be slow for large documents.

> It would make selection easier if selecting text could be abstracted to

> selection within continuous plain text as an alternative. Non-text objects

> could be represented as a special character - the whole object will be

> selected if in the selection range (partial object selections (tables) can

> be selected using the current methods). Invariably one is not interested

in

> how the text is divided up internally in items - if one could be spared

> having to process through these internal items to arrive at the nth

> character, it would be great.

> eg: PlainText, PlainSelStart, PlainSelLen, PlainSelText properties

>

>