RE: [advanced_delphi] Double-clicking row in DBGrid

[David Smith]

TMesssage is a custom message event. That is how you obtain the mouse 
coordinates in a non click event. Look at the source code of this event in 
DBGrids.pas and copy its usage of TMessage. Also look up in help about 
TMessage. It's a skill you obviously need to add to your toolbox.

Dave

David Wright <[EMAIL PROTECTED]> wrote:                                  
Thanks...
  
 I have done very similar code for popup menus, but how  would this translate 
to a double-click event -- that is what is stumping  me...
  

  
---------------------------------
 From: advanced_delphi@yahoogroups.com  [mailto:[EMAIL PROTECTED] On Behalf Of 
David  Smith
Sent: Saturday, December 01, 2007 8:03 PM
To:  advanced_delphi@yahoogroups.com
Subject: Re: [advanced_delphi]  Double-clicking row in DBGrid


 
  As is shown in the source code for DBGrid.pas below. Catch the mouse button  
up message (which supplies the mouse coordinates) and use with the built-in  
functions to find out where you are and process accordingly:

procedure  TCustomDBGrid.DefaultHandler(var Msg);
var
  P:  TPopupMenu;
  Cell: TGridCoord;
begin
  inherited  DefaultHandler(Msg);
  if TMessage(Msg).Msg = wm_RButtonUp  then
    with TWMRButtonUp(Msg) do
     begin
      Cell := MouseCoord(XPos,  YPos);
      if (Cell.X < FIndicatorOffset) or  (Cell.Y < 0) then Exit;
      P :=  Columns[RawToDataColumn(Cell.X)].PopupMenu;
       if (P <> nil) and P.AutoPopup then
       begin
         SendCancelMode(nil);
         P.PopupComponent := Self;
        with  ClientToScreen(SmallPointToPoint(Pos))  do
          P.Popup(X,  Y);
        Result :=  1;
      end;
     end;
end;

David Wright <[EMAIL PROTECTED]>  wrote: 
      
   Hi    All,
    
   I am having a    total mind blank right now...  I know I have done this 
before, but    exactly how escapes me.
    
   I want to enable    the user to double-click on a row in a DBGrid to launch 
an action.  That    part is easy and works fine.
    
   What I cannot    remember how to do is ignore double-clicks that occur 
somewhere other than a    row in the table.  For example, if I double-click the 
title bar or the    whitespace below the last row, I do not want to launch the  
  action.
    
   I know I can get    Mouse Coordinates from the MouseDown event, but how do I 
do this in the Double    Click event?
    
   Any guidance will    be appreciated,
   Thanks!
   Dave
   


  

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