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InputQuery Question

Posted on 1998-03-22
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Last Modified: 2010-05-18
In InputQuery, How do I limit the input text to a certain length?
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Question by:ronit051397
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4 Comments
 
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Socrates050697 earned 30 total points
ID: 1360694
Assuming you have the VCL source code :-

Goto line 1691 of the unit 'Dialogs.pas'
this should be in \program file\borland\delphi 3\source.

This line is 'MaxLength:=255'
merely change this to what ever value you want.


Socrates
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by:ronit051397
ID: 1360695
I don't want to change anything in borland's source code, besides, i need to change the MaxLength dynamically from my source.
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Expert Comment

by:Socrates050697
ID: 1360696
Just copy the InputQuery function from Borland Source code and call it something like MyInputQuery and then you can add a parameter to the function call to specify how many characters you want to allow.
e.g.:-

function MyInputQuery(const ACaption, APrompt: string;
  var Value: string; EditLength: integer): Boolean;
var
  Form: TForm;
  Prompt: TLabel;
  Edit: TEdit;
  DialogUnits: TPoint;
  ButtonTop, ButtonWidth, ButtonHeight: Integer;
begin
  Result := False;
  Form := TForm.Create(Application);
  with Form do
    try
      Canvas.Font := Font;
      DialogUnits := GetAveCharSize(Canvas);
      BorderStyle := bsDialog;
      Caption := ACaption;
      ClientWidth := MulDiv(180, DialogUnits.X, 4);
      ClientHeight := MulDiv(63, DialogUnits.Y, 8);
      Position := poScreenCenter;
      Prompt := TLabel.Create(Form);
      with Prompt do
      begin
        Parent := Form;
        AutoSize := True;
        Left := MulDiv(8, DialogUnits.X, 4);
        Top := MulDiv(8, DialogUnits.Y, 8);
        Caption := APrompt;
      end;
      Edit := TEdit.Create(Form);
      with Edit do
      begin
        Parent := Form;
        Left := Prompt.Left;
        Top := MulDiv(19, DialogUnits.Y, 8);
        Width := MulDiv(164, DialogUnits.X, 4);
        MaxLength := EditLength;
        Text := Value;
        SelectAll;
      end;
      ButtonTop := MulDiv(41, DialogUnits.Y, 8);
      ButtonWidth := MulDiv(50, DialogUnits.X, 4);
      ButtonHeight := MulDiv(14, DialogUnits.Y, 8);
      with TButton.Create(Form) do
      begin
        Parent := Form;
        Caption := SMsgDlgOK;
        ModalResult := mrOk;
        Default := True;
        SetBounds(MulDiv(38, DialogUnits.X, 4), ButtonTop, ButtonWidth,
          ButtonHeight);
      end;
      with TButton.Create(Form) do
      begin
        Parent := Form;
        Caption := SMsgDlgCancel;
        ModalResult := mrCancel;
        Cancel := True;
        SetBounds(MulDiv(92, DialogUnits.X, 4), ButtonTop, ButtonWidth,
          ButtonHeight);
      end;
      if ShowModal = mrOk then
      begin
        Value := Edit.Text;
        Result := True;
      end;
    finally
      Form.Free;
    end;
end;

All I've changed is the name of the function, added EditLength to the function parameters and changed the line MaxLength:=255 to MaxLength:=EditLength.


Socrates
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LVL 5

Author Comment

by:ronit051397
ID: 1360697
I didn't mean to write it from scratch...
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