{ Input ComboBox dialog }
//einen Input Dialog mit ComboBox realisieren, like InputBox,-Query Function
//an input dialog with combo box realize, like input box,-Query Function
function InputCombo(const ACaption, APrompt: string; const AList: TStrings): string;
function GetCharSize(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;
var Form: TForm;
Prompt: TLabel;
Combo: TComboBox;
DialogUnits: TPoint;
ButtonTop, ButtonWidth, ButtonHeight: Integer; begin Result := '';
Form := TForm.Create(Application); with Form do
try Canvas.Font := Font;
DialogUnits := GetCharSize(Canvas);
BorderStyle := bsDialog;
Caption := ACaption;
ClientWidth := MulDiv(180, DialogUnits.X, 4);
Position := poScreenCenter;
Prompt := TLabel.Create(Form); with Prompt do
begin Parent := Form;
Caption := APrompt;
Left := MulDiv(8, DialogUnits.X, 4);
Top := MulDiv(8, DialogUnits.Y, 8);
Constraints.MaxWidth := MulDiv(164, DialogUnits.X, 4);
WordWrap := True; end;
Combo := TComboBox.Create(Form); with Combo do
begin Parent := Form;
Style := csDropDownList; //für Eingabemöglichkeit in Combo verwende
//For input possibility in combo uses
//Style := csDropDown; Items.Assign(AList);
ItemIndex := 0;
Left := Prompt.Left;
Top := Prompt.Top + Prompt.Height + 5;
Width := MulDiv(164, DialogUnits.X, 4); end;
ButtonTop := Combo.Top + Combo.Height + 15;
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 := 'Abbrechen';
ModalResult := mrCancel;
Cancel := True;
SetBounds(MulDiv(92, DialogUnits.X, 4), Combo.Top + Combo.Height + 15,
ButtonWidth, ButtonHeight);
Form.ClientHeight := Top + Height + 13; end; if ShowModal = mrOk then
begin Result := Combo.Text; end; finally Form.Free; end; end;
//Beispiel
//Example procedure TForm1.Button1Click(Sender: TObject); var List: TStringList; begin List := TStringList.Create; try List.Add('Auswahl1');
List.Add('Auswahl2');
List.Add('Auswahl3');
//Beispielaufruf der Funktion
//Example call of the function Label1.Caption := InputCombo('Input Combo', 'Caption', List); finally List.Free; end; end;