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How to create a hint for a single cell in a TDrawGrid or TDBGrid Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
27-Aug-02
Category
VCL-General
Language
Delphi 2.x
Views
132
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Tomas Rutkauskas

How can I make a hint for a single cell in a TDBGrid or TDrawGrid? I want to 
display any text in a grid cell even if it is not placed in the cell completely.

Answer:

Here's an example taken from a working app but simplified a little. OldHintRow and 
OldHintCol are private variables declared in TStosWin. They store the column and 
row for which the hint was shown previously.
1   
2   procedure TStosWin.MyDrawGrid1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: 
3   Integer);
4   var
5     R, C: Integer;
6   begin
7     with MyDrawGrid1 do
8     begin
9       MouseToCell(X, Y, C, R);
10      if (C = OldHintCol) and (R = OldHintRow) then
11        exit; {Don't do anything if mouse is in the same cell}
12      OldHintCol := C;
13      OldHintRow := R;
14      Hint := ' Your hint for column C and row R';
15      {Force the hint to redisplay}
16      PostMessage(Handle, WM_MBUTTONDOWN, MK_LBUTTON, Dword((Y shl 16) + X));
17    end;
18  end;


			
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