text: #include "stdafx.h"
  
  
  
  namespace {
  	// Anonymous namespace : standard practice in fb2k components
  	// Nothing outside should have any reason to see these symbols, and we don't want funny results if another cpp has similarly named classes.
  	// service_factory at the bottom takes care of publishing our class.
  
  	// This is our GUID. Substitute with your own when reusing code.
  	static const GUID guid_myelem = { 0xb46dc166, 0x88f3, 0x4b45, { 0x9f, 0x77, 0xab, 0x33, 0xf4, 0xc3, 0xf2, 0xe4 } };
  
  	class CMyElemWindow : public ui_element_instance, public CWindowImpl<CMyElemWindow> {
  	public:
  		// ATL window class declaration. Replace class name with your own when reusing code.
  		DECLARE_WND_CLASS_EX(TEXT("{DC2917D5-1288-4434-A28C-F16CFCE13C4B}"),CS_VREDRAW | CS_HREDRAW,(-1));
  
  		void initialize_window(HWND parent) {WIN32_OP(Create(parent) != NULL);}
  
  		BEGIN_MSG_MAP(CMyElemWindow)
  			MESSAGE_HANDLER(WM_LBUTTONDOWN,OnLButtonDown);
  			MSG_WM_ERASEBKGND(OnEraseBkgnd)
  			MSG_WM_PAINT(OnPaint)
  		END_MSG_MAP()
  
  		CMyElemWindow(ui_element_config::ptr,ui_element_instance_callback_ptr p_callback);
  		HWND get_wnd() {return *this;}
  		void set_configuration(ui_element_config::ptr config) {m_config = config;}
  		ui_element_config::ptr get_configuration() {return m_config;}
  		static GUID g_get_guid() {
  			return guid_myelem;
  		}
  		static GUID g_get_subclass() {return ui_element_subclass_utility;}
  		static void g_get_name(pfc::string_base & out) {out = "Sample UI Element";}
  		static ui_element_config::ptr g_get_default_configuration() {return ui_element_config::g_create_empty(g_get_guid());}
  		static const char * g_get_description() {return "This is a sample UI Element.";}
  	
  		void notify(const GUID & p_what, t_size p_param1, const void * p_param2, t_size p_param2size);
  	private:
  		LRESULT OnLButtonDown(UINT,WPARAM,LPARAM,BOOL&) {m_callback->request_replace(this);return 0;}
  		void OnPaint(CDCHandle);
  		BOOL OnEraseBkgnd(CDCHandle);
  		ui_element_config::ptr m_config;
  	protected:
  		// this must be declared as protected for ui_element_impl_withpopup<> to work.
  		const ui_element_instance_callback_ptr m_callback;
  	};
  	void CMyElemWindow::notify(const GUID & p_what, t_size p_param1, const void * p_param2, t_size p_param2size) {
  		if (p_what == ui_element_notify_colors_changed || p_what == ui_element_notify_font_changed) {
  			// we use global colors and fonts - trigger a repaint whenever these change.
  			Invalidate();
  		}
  	}
  	CMyElemWindow::CMyElemWindow(ui_element_config::ptr config,ui_element_instance_callback_ptr p_callback) : m_callback(p_callback), m_config(config) {
  	}
  
  	BOOL CMyElemWindow::OnEraseBkgnd(CDCHandle dc) {
  		CRect rc; WIN32_OP_D( GetClientRect(&rc) );
  		CBrush brush;
  		WIN32_OP_D( brush.CreateSolidBrush( m_callback->query_std_color(ui_color_background) ) != NULL );
  		WIN32_OP_D( dc.FillRect(&rc, brush) );
  		return TRUE;
  	}
  	void CMyElemWindow::OnPaint(CDCHandle) {
  		CPaintDC dc(*this);
  		dc.SetTextColor( m_callback->query_std_color(ui_color_text) );
  		dc.SetBkMode(TRANSPARENT);
  		SelectObjectScope fontScope(dc, (HGDIOBJ) m_callback->query_font_ex(ui_font_default) );
  		const UINT format = DT_NOPREFIX | DT_CENTER | DT_VCENTER | DT_SINGLELINE;
  		CRect rc; 
  		WIN32_OP_D( GetClientRect(&rc) );
  		WIN32_OP_D( dc.DrawText(_T("This is a sample element."), -1, &rc, format) > 0 );
  	}
  
  	// ui_element_impl_withpopup autogenerates standalone version of our component and proper menu commands. Use ui_element_impl instead if you don't want that.
  	class ui_element_myimpl : public ui_element_impl_withpopup<CMyElemWindow> {};
  
  	static service_factory_single_t<ui_element_myimpl> g_ui_element_myimpl_factory;
  
  } // namespace