const
  mcHorzMargin = 8;
  mcVertMargin = 8;
  mcHorzSpacing = 10;
  mcVertSpacing = 10;
  mcButtonWidth = 50;
  mcButtonHeight = 14;
  mcButtonSpacing = 4;
var
  DialogUnits: TPoint;
  HorzMargin, VertMargin, HorzSpacing, VertSpacing, ButtonWidth,
  ButtonHeight, ButtonSpacing, ButtonCount, ButtonGroupWidth,
  IconTextWidth, IconTextHeight, X, ALeft: Integer;
  B, CancelButton: TMsgDlgBtn;
  IconID: PAnsiChar;
  ATextRect: TRect;
  ThisButtonWidth: integer;
  LButton: TTntButton;
begin
  Result := TTntMessageForm.CreateNew(Application);
  with Result do
  begin
    BorderStyle := bsDialog; // By doing this first, it will work on WINE.
    BiDiMode := Application.BiDiMode;
    Canvas.Font := Font;
    KeyPreview := True;
    Position := poDesigned;
    OnKeyDown := TTntMessageForm(Result).CustomKeyDown;
    DialogUnits := GetAveCharSize(Canvas);
    HorzMargin := MulDiv(mcHorzMargin, DialogUnits.X, 4);
    VertMargin := MulDiv(mcVertMargin, DialogUnits.Y, 8);
    HorzSpacing := MulDiv(mcHorzSpacing, DialogUnits.X, 4);
    VertSpacing := MulDiv(mcVertSpacing, DialogUnits.Y, 8);
    ButtonWidth := MulDiv(mcButtonWidth, DialogUnits.X, 4);
    for B := Low(TMsgDlgBtn) to High(TMsgDlgBtn) do
    begin
      if B in Buttons then
      begin
        ATextRect := Rect(0,0,0,0);
        Tnt_DrawTextW(Canvas.Handle,
          PWideChar(GetButtonCaption(B)), -1,
          ATextRect, DT_CALCRECT or DT_LEFT or DT_SINGLELINE or
          DrawTextBiDiModeFlagsReadingOnly);
        with ATextRect do ThisButtonWidth := Right - Left + 8;
        if ThisButtonWidth > ButtonWidth then
          ButtonWidth := ThisButtonWidth;
      end;
    end;
    ButtonHeight := MulDiv(mcButtonHeight, DialogUnits.Y, 8);
    ButtonSpacing := MulDiv(mcButtonSpacing, DialogUnits.X, 4);
    SetRect(ATextRect, 0, 0, Screen.Width div 2, 0);
    Tnt_DrawTextW(Canvas.Handle, PWideChar(Msg), Length(Msg) + 1, ATextRect,
      DT_EXPANDTABS or DT_CALCRECT or DT_WORDBREAK or
      DrawTextBiDiModeFlagsReadingOnly);
    IconID := IconIDs[DlgType];
    IconTextWidth := ATextRect.Right;
    IconTextHeight := ATextRect.Bottom;
    if IconID <> nil then
    begin
      Inc(IconTextWidth, 32 + HorzSpacing);
      if IconTextHeight < 32 then IconTextHeight := 32;
    end;
    ButtonCount := 0;
    for B := Low(TMsgDlgBtn) to High(TMsgDlgBtn) do
      if B in Buttons then Inc(ButtonCount);
    ButtonGroupWidth := 0;
    if ButtonCount <> 0 then
      ButtonGroupWidth := ButtonWidth * ButtonCount +
        ButtonSpacing * (ButtonCount - 1);
    ClientWidth := Max(IconTextWidth, ButtonGroupWidth) + HorzMargin * 2;
    ClientHeight := IconTextHeight + ButtonHeight + VertSpacing +
      VertMargin * 2;
    Left := (Screen.Width div 2) - (Width div 2);
    Top := (Screen.Height div 2) - (Height div 2);
    if DlgType <> mtCustom then
      Caption := GetMessageCaption(DlgType)
    else
      Caption := TntApplication.Title;
    if IconID <> nil then
      with TTntImage.Create(Result) do
      begin
        Name := 'Image';
        Parent := Result;
        Picture.Icon.Handle := LoadIcon(0, IconID);
        SetBounds(HorzMargin, VertMargin, 32, 32);
      end;
    TTntMessageForm(Result).Message := TTntLabel.Create(Result);
    with TTntMessageForm(Result).Message do
    begin
      Name := 'Message';
      Parent := Result;
      WordWrap := True;
      Caption := Msg;
      BoundsRect := ATextRect;
      BiDiMode := Result.BiDiMode;
      ALeft := IconTextWidth - ATextRect.Right + HorzMargin;
      if UseRightToLeftAlignment then
        ALeft := Result.ClientWidth - ALeft - Width;
      SetBounds(ALeft, VertMargin,
        ATextRect.Right, ATextRect.Bottom);
    end;
    if mbCancel in Buttons then CancelButton := mbCancel else
      if mbNo in Buttons then CancelButton := mbNo else
        CancelButton := mbOk;
    X := (ClientWidth - ButtonGroupWidth) div 2;
    for B := Low(TMsgDlgBtn) to High(TMsgDlgBtn) do
      if B in Buttons then
      begin
        LButton := TTntButton.Create(Result);
        with LButton do
        begin
          Name := ButtonNames[B];
          Parent := Result;
          Caption := GetButtonCaption(B);
          ModalResult := ModalResults[B];
          if B = DefaultButton then
          begin
            Default := True;
            ActiveControl := LButton;
          end;
          if B = CancelButton then
            Cancel := True;
          SetBounds(X, IconTextHeight + VertMargin + VertSpacing,
            ButtonWidth, ButtonHeight);
          Inc(X, ButtonWidth + ButtonSpacing);
          if B = mbHelp then
            OnClick := TTntMessageForm(Result).HelpButtonClick;
        end;
      end;
  end;
end;

function WideCreateMessageDialog(const Msg: WideString; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons): TTntForm;
var
  DefaultButton: TMsgDlgBtn;
begin
  if mbOk in Buttons then DefaultButton := mbOk else
    if mbYes in Buttons then DefaultButton := mbYes else
      DefaultButton := mbRetry;
  Result := WideCreateMessageDialog(Msg, DlgType, Buttons, DefaultButton);
end;

function WideMessageDlg(const Msg: WideString; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint; DefaultButton: TMsgDlgBtn): Integer;
begin
  Result := WideMessageDlgPosHelp(Msg, DlgType, Buttons, HelpCtx, -1, -1, '', DefaultButton);
end;

function WideMessageDlg(const Msg: WideString; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint): Integer;
begin
  Result := WideMessageDlgPosHelp(Msg, DlgType, Buttons, HelpCtx, -1, -1, '');
end;

function WideMessageDlgPos(const Msg: WideString; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint; X, Y: Integer; DefaultButton: TMsgDlgBtn): Integer;
begin
  Result := WideMessageDlgPosHelp(Msg, DlgType, Buttons, HelpCtx, X, Y, '', DefaultButton);
end;

function WideMessageDlgPos(const Msg: WideString; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint; X, Y: Integer): Integer;
begin
  Result := WideMessageDlgPosHelp(Msg, DlgType, Buttons, HelpCtx, X, Y, '');
end;

function _Internal_WideMessageDlgPosHelp(Dlg: TTntForm; HelpCtx: Longint; X, Y: Integer;
  const HelpFileName: WideString): Integer;
begin
  with Dlg do
    try
      HelpContext := HelpCtx;
      HelpFile := HelpFileName;
      if X >= 0 then Left := X;
      if Y >= 0 then Top := Y;
      if (Y < 0) and (X < 0) then Position := poScreenCenter;
      Result := ShowModal;
    finally
      Free;
    end;
end;

function WideMessageDlgPosHelp(const Msg: WideString; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint; X, Y: Integer;
  const HelpFileName: WideString; DefaultButton: TMsgDlgBtn): Integer;
begin
  Result := _Internal_WideMessageDlgPosHelp(
    WideCreateMessageDialog(Msg, DlgType, Buttons, DefaultButton), HelpCtx, X, Y, HelpFileName);
end;

function WideMessageDlgPosHelp(const Msg: WideString; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint; X, Y: Integer;
  const HelpFileName: WideString): Integer;
begin
  Result := _Internal_WideMessageDlgPosHelp(
    WideCreateMessageDialog(Msg, DlgType, Buttons), HelpCtx, X, Y, HelpFileName);
end;

procedure WideShowMessage(const Msg: WideString);
begin
  WideShowMessagePos(Msg, -1, -1);
end;

procedure WideShowMessageFmt(const Msg: WideString; Params: array of const);
begin
  WideShowMessage(WideFormat(Msg, Params));
end;

procedure WideShowMessagePos(const Msg: WideString; X, Y: Integer);
begin
  WideMessageDlgPos(Msg, mtCustom, [mbOK], 0, X, Y);
end;

{ Input dialog }

function WideInputQuery(const ACaption, APrompt: WideString; var Value: WideString): Boolean;
var
  Form: TTntForm;
  Prompt: TTntLabel;
  Edit: TTntEdit;
  DialogUnits: TPoint;
  ButtonTop, ButtonWidth, ButtonHeight: Integer;
begin
  Result := False;
  Form := TTntForm.Create(Application);
  with Form do begin
    try
      BorderStyle := bsDialog; // By doing this first, it will work on WINE.
      Canvas.Font := Font;
      DialogUnits := GetAveCharSize(Canvas);
      Caption := ACaption;
      ClientWidth := MulDiv(180, DialogUnits.X, 4);
      Position := poScreenCenter;
      Prompt := TTntLabel.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;
      Edit := TTntEdit.Create(Form);
      with Edit do
      begin
        Parent := Form;
        Left := Prompt.Left;
        Top := Prompt.Top + Prompt.Height + 5;
        Width := MulDiv(164, DialogUnits.X, 4);
        MaxLength := 255;
        Text := Value;
        SelectAll;
      end;
      ButtonTop := Edit.Top + Edit.Height + 15;
      ButtonWidth := MulDiv(50, DialogUnits.X, 4);
      ButtonHeight := MulDiv(14, DialogUnits.Y, 8);
      with TTntButton.Create(Form) do
      begin
        Parent := Form;
        Caption := SMsgDlgOK;
        ModalResult := mrOk;
        Default := True;
        SetBounds(MulDiv(38, DialogUnits.X, 4), ButtonTop, ButtonWidth,
          ButtonHeight);
      end;
      with TTntButton.Create(Form) do
      begin
        Parent := Form;
        Caption := SMsgDlgCancel;
        ModalResult := mrCancel;
        Cancel := True;
        SetBounds(MulDiv(92, DialogUnits.X, 4), Edit.Top + Edit.Height + 15, ButtonWidth,
          ButtonHeight);
        Form.ClientHeight := Top + Height + 13;
      end;
      if ShowModal = mrOk then
      begin
        Value := Edit.Text;
        Result := True;
      end;
    finally
      Form.Free;
    end;
  end;
end;

function WideInputBox(const ACaption, APrompt, ADefault: WideString): WideString;
begin
  Result := ADefault;
  WideInputQuery(ACaption, APrompt, Result);
end;

function WidePromptForFileName(var AFileName: WideString; const AFilter: WideString = '';
  const ADefaultExt: WideString = ''; const ATitle: WideString = '';
  const AInitialDir: WideString = ''; SaveDialog: Boolean = False): Boolean;
var
  Dialog: TTntOpenDialog;
begin
  if SaveDialog then
  begin
    Dialog := TTntSaveDialog.Create(nil);
    Dialog.Options := Dialog.Options + [ofOverwritePrompt];
  end
  else
    Dialog := TTntOpenDialog.Create(nil);
  with Dialog do
  try
    Title := ATitle;
    DefaultExt := ADefaultExt;
    if AFilter = '' then
      Filter := SDefaultFilter else
      Filter := AFilter;
    InitialDir := AInitialDir;
    FileName := AFileName;
    Result := Execute;
    if Result then
      AFileName := FileName;
  finally
    Free;
  end;
end;

end.