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Re: Label and Focus [message #13253 is a reply to message #13251]

Wed, 26 December 2007 11:28

mirek
Messages: 14267
Registered: November 2005

Ultimate Member

forlano wrote on Wed, 26 December 2007 04:45

Hello,

I put a picture made with the iml designer inside a label to build a piece of a chessboard. I can drag it over an empty layout with this snippet:

void Chessboard::LeftDown(Point pos, dword flags) 
{   if (!piece.HasCapture()) piece.SetCapture();
	else piece.ReleaseCapture();      
}

 
void Chessboard::MouseMove(Point pos, dword flags) 
{     
    p = pos;    
    if (piece.HasCapture()) piece.LeftPosZ(p.x - D/2, D).TopPosZ(p.y - D/2, D);
 	Refresh();
}

Unfortunately the piece is moved even when I click click and drag OUT of the label size.
Perhaps I've programmed in a bad way, but now I need to know when I leftclick if I clicked the label or the empty layout. Is there a way?
In future, with many pieces on the board (32), I need to recover the name/adress of the piece. In this case a button with a focus maybe a better ctrl? By the way, in the previous snippet If I change the Label with a Button I'm not able to click and drag anything.

Thank you,
Luigi

PS: I attach the whole package, just other few lines, for a better understanding

Uh, there is a couple of problems with your code. In fact, it works only very accidentally Smile

Instead of going into details: I would never do this using Label to represent individual pieces. Instead, pieces should not be widgets! Make an array of pieces (16 + 16), when clicking board position, identify the piece standing on it, then SetCapture for the board and move the piece.

Long time ago I was experimenting with simple chess algorithm (only 5x5 board and peons). There is no dragging, but perhaps you could find it helpful... attaching.

Mirek

Attachment: Chess.zip
(Size: 2.45KB, Downloaded 327 times)

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