HELP!!! Problems with Edit Control!! urgent!!

Posted on 1999-01-12
Medium Priority
Last Modified: 2010-04-06
Hi all!!!

I have the following problem.... my main form has a lot of Edit controls... some of them are 22 units width (which accept 2 characters), and others 14 units (which accept 1 character). The font used is Courier New, 8 pts. The problem I have only with the Edit controls 14 units width. In my PC the text I want to display is shown correctly but only in the 1024x768x32 resolution (in other resolutions the controls appear in blank). When I ran the program in other PC, it was impossible for me to make the control show the text properly (the controls appear in blank again). I realized that the text is there, but too left justified, so the control doesn't show it. To make it work, I have to change either the width (to 21 units at least) or the font (small font, 7 pts, only).

What the hell can I do!!!!!! I HAVE to use Courier New font and that width. Is it a control problem? windows problem? If I would install a new edit control, would I solve the problem? where can I download a new one?

THANKS a lot in advance
Question by:skel
LVL 12

Accepted Solution

rwilson032697 earned 280 total points
ID: 1356118
The problem lies in that the font size is fixed number of points (where one point = 1/72 inches) and the number of screen pixels taken by a character of a fixed point size depends on the physical dots per inch of the particular screen resolution.

Effectively your only solution is to modify the point size, or to force the form to scale with changes in resolution.

Here is a component that will do this (written by Viktornet I believe...):

unit Scaler;


           Windows, Messages, SysUtils, Classes, Graphics, Controls,
            ScreenWidth  : Integer = 800; //If you don't want to declare

                                         //you'd have to have a
            ScreenHeight : Integer = 600;//property for each of these
two so
    you can
        // declare it at //designtime
           TScaler = class(TComponent)
             FAllScaled : Boolean;
             { Protected declarations }
             constructor Create(AOwner : TComponent);override;
             procedure Loaded;override;
             { Published declarations }
         procedure Register;
    constructor TScaler.Create(AOwner : TComponent);
      Inherited Create(AOwner);
      fAllScaled := False;
    procedure TScaler.Loaded;
      if not(csDesigning in ComponentState) then
        if Owner is TForm then
        with TForm(Owner) do begin
          Font.Pitch := fpVariable;
          if (not

             Scaled := True;
             AutoScroll := False;
              if Screen.Width < ScreenWidth then
             ScaleBy(Screen.Width, ScreenWidth)
             else ScaleBy(ScreenWidth, Screen.Width);
             fAllScaled := True;
    procedure Register;
      RegisterComponents('System', [TScaler]);


Expert Comment

ID: 1356119
Instead of hard wiring 14, why not (in FormCreate) set the width property of the edit control to [YourForm.]Canvas.TextWidth('A');

You might like to add another 3 or 4 pixels to account for the edit's border maybe.

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