将输入的下一个控制重点放在重写的KeyUp上

Question

我有我的自定义类扩展TEdit:

  TMyTextEdit = class (TEdit)
   private
     fFocusNextOnEnter: Boolean;
   public
    procedure KeyUp(var Key: Word; Shift :TShiftState); override;
   published
     property FocusNextOnExnter: Boolean read fFocusNextOnEnter
                                 write fFocusNextOnEnter default false;
  end;

在KeyUp程序中我做:

procedure TMyTextEdit.KeyUp(var Key: Word; Shift: TShiftState);
begin
  inherited;

  if FocusNextOnExnter then
    if Key = VK_RETURN then 
      SelectNext(Self as TWinControl, True, false);
end;

但它没有将焦点转移到下一个控制.我试过了

if Key = VK_RETURN then
      Key := VK_TAB;

但它也没有用.我错过了什么？

Answer 1

SelectNext选择下一个兄弟儿童控制,即.你需要在编辑的父母上调用它:

type
  THackWinControl = class(TWinControl);

if Key = VK_RETURN then
  if Assigned(Parent) then
    THackWinControl(Parent).SelectNext(Self, True, False);

Answer 2

这是PostMessage方法(使用Messages)记录:)

procedure TMyEdit.KeyUp(var Key: Word; Shift: TShiftState);
begin
  inherited;
  if FocusNextOnExnter then
    if Key = VK_RETURN then begin
      PostMessage(GetParentForm(Self).Handle, wm_NextDlgCtl, Ord((ssShift in Shift)), 0);
      Key := 0;
    end;
end;

Answer 3

procedure TMyEdit.KeyUp(var Key: Word; Shift: TShiftState);
begin

  inherited;

  if FocusNextOnExnter and Focused and (Key = VK_RETURN) then 

  begin

    Perform(CM_DIALOGKEY, VK_TAB, 0);

    Key := 0;

  end;

end;