delphi - 自定义组件如何处理其子组件的事件？

Question

我正在设计一个面板后代组件，上面有一个按钮控件：

THidePanel = class(TPanel)
private
  TActivateButton: TButton;
public
  constructor Create(aOwner: TComponent); override;
  procedure WMSize(var Msg: TWMSize); message WM_SIZE;
  procedure HideComponents;
end;

该组件如何处理其 TActivateButton 控件的 OnClick 事件？

Answer 1

由于按钮是组件私有的，您只需将事件处理程序附加到它，即

THidePanel = class(TPanel)
  ...
  private
    procedure H_ActivateButtonClick(Sender: TObject);
  ...
end;

constructor THidePanel.Create(aOwner: TComponent);
begin
  inherited;
  ...
  FActivateButton := TButton.Create(Self);
  FActivateButton.Parent := Self;
  FActivateButton.OnClick:= H_ActivateButtonClick;
end

procedure THidePanel.H_ActivateButtonClick(Sender: TObject)
begin
  // button is clicked!
end

如果您还需要向组件的最终用户提供事件，那么您需要添加一个TNotifyEvent属性并从您的内部处理程序中调用它，即

THidePanel = class(TPanel)
  private
    FOnActivateBtnClick: TNotifyEvent;
  ...
  published
    property OnActivateButtonClick: TNotifyEvent read FOnActivateBtnClick write FOnActivateBtnClick;
end;

procedure THidePanel.H_ActivateButtonClick(Sender: TObject)
begin
  // button is clicked!
  ...
  // fire the end user event
  if(Assigned(FOnActivateBtnClick))then FOnActivateBtnClick(Self);
end