Solved

Tooltip for stringgrids cells

Posted on 2008-10-22
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Last Modified: 2013-11-23
Hello,

I'm in the need of a code that can:
show a tooltip over a stringgrid (it should be shown just under the cell that the mouse pointer hovers). it should be shown about 0,5sec after the mouse enters the cell, and only if the text in the cell is too long to fit in the cell (i use drawtext in the ondrawcell event to paint the text inside the cells). and it should be shown as long as the mouse cursor is in the cell (even if it's moved, but inside the cell).

Best regards
szafran81
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Question by:szafran81
2 Comments
 
LVL 14

Accepted Solution

by:
SteveBay earned 500 total points
ID: 22778847
Place a TStringGrid on a form and try this code. I think it's very close to what you are asking for. With thanks to meikl
http://www.experts-exchange.com/Programming/Languages/Pascal/Delphi/Q_20737679.html
unit Unit1;
 

interface
 

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, Grids, StdCtrls;
 

Type MyGrid = class(TStringGrid);
 

type

  TForm1 = class(TForm)

    StringGrid1: TStringGrid;

    Label1: TLabel;

    procedure FormShow(Sender: TObject);

    procedure StringGrid1MouseMove(Sender: TObject; Shift: TShiftState; X,

      Y: Integer);

  private

     LastGridCoord : TGridCoord;

     procedure DisplayHint(Sender: TObject);

  public

     procedure OnShowHint(var HintStr: string; var CanShow: Boolean; var HintInfo: THintInfo);

  end;
 

var

  Form1: TForm1;
 

implementation
 

{$R *.dfm}
 

procedure TForm1.DisplayHint(Sender: TObject);

begin

end;
 

procedure TForm1.FormShow(Sender: TObject);

begin

     Application.OnShowHint := OnShowHint;

end;
 

procedure TForm1.OnShowHint(var HintStr: string; var CanShow: Boolean; var HintInfo: THintInfo);

var GridCoord : TGridCoord;

     Grid : TStringGrid;

begin

     if (HintInfo.HintControl is TStringGrid) then

          begin

          Grid := TStringGrid(HintInfo.HintControl);

          GridCoord := Grid.MouseCoord(HintInfo.CursorPos.x,HintInfo.CursorPos.y);

          HintStr := Grid.Cells[GridCoord.X, gridCoord.Y];

          if Grid.Canvas.TextWidth(HintStr) > Grid.CellRect(GridCoord.X, gridCoord.Y).Right - Grid.CellRect(GridCoord.X, gridCoord.Y).Left then

               begin

               HintInfo.HintPos.X := Self.ClientOrigin.X + Grid.Left + Grid.CellRect(GridCoord.X, gridCoord.Y).Left;

               HintInfo.HintPos.Y :=  Self.ClientOrigin.Y + Grid.Top  +

                         Grid.CellRect(GridCoord.X, gridCoord.Y).Bottom;

               HintInfo.ReshowTimeout := 500;

               end

          else

               CanShow := False;

          end;

end;
 

procedure TForm1.StringGrid1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);

var Grid : TStringGrid;

begin

     if Sender is TStringGrid then

          begin

          Grid := TStringGrid(Sender);

          if (LastGridCoord.X <> Grid.MouseCoord(X,Y).X ) and

              (LastGridCoord.Y <> Grid.MouseCoord(X,Y).Y ) Then

               begin

               Application.HideHint;

               LastGridCoord := TStringGrid(Sender).MouseCoord(X,Y);

               end;

          end;

end;
 

end.

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Author Comment

by:szafran81
ID: 22791588
hmm... i haven't received any emails that you added a comment here... just came to close the Q, since i've just finished writing my own code for this (but based on a timer and a statictext as tooltip - works great)... as i can see the code is very similar... so i can accept your solution (to bad i haven't seen it earlier).
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