Saiba como criar um InputBox, com um Edit e máscara para senhas. Primeiramente, adicione os seguintes procedimentos:
function InputBoxPass(const ACaption, APrompt, ADefault: string): string;
function InputSenha(const ACaption, APrompt: string; var Value: string): Boolean;
function GetAveCharSize(Canvas: TCanvas): TPoint;
E implemente-os com o seguinte código:
function TForm1.GetAveCharSize(Canvas: TCanvas): TPoint;
var
I: Integer;
Buffer: array[0..51] of Char;
begin
for I := 0 to 25 do Buffer[I] := Chr(I + Ord('A'));
for I := 0 to 25 do Buffer[I + 26] := Chr(I + Ord('a'));
GetTextExtentPoint(Canvas.Handle, Buffer, 52, TSize(Result));
Result.X := Result.X div 52;
end;
function TForm1.InputBoxPass(const ACaption, APrompt,
ADefault: string): string;
begin
Result := ADefault;
InputSenha(ACaption, APrompt, Result);
end;
function TForm1.InputSenha(const ACaption, APrompt: string;
var Value: string): 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 := poMainformcenter;
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 := 20;
{} Passwordchar := '*';
{} Font.Color := clBlue;
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 := 'Ok';
ModalResult := mrOk;
Default := True;
SetBounds(MulDiv(38, DialogUnits.X, 4), ButtonTop, ButtonWidth, ButtonHeight);
end;
with TButton.Create(Form) do
begin
Parent := Form;
Caption := 'Cancelar';
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;
Após, adicione um Button e um Label no formulário, e no evento nClick do botão, digite:
Label1.Caption := InputBoxPass('','','');
O resultado será igual ao da Figura 1.
