cc_item: add signsl OnBeforePaintInit()

src/gui/components/cc_item.cpp

@@ -67,6 +67,8 @@ void CComponentsItem::initParent(CComponentsForm* parent)
 // If backround is not required, it's possible to override this with variable paint_bg=false, use doPaintBg(true/false) to set this!
 void CComponentsItem::paintInit(const bool &do_save_bg)
 {
+	OnBeforePaintInit();
+
 	if (cc_parent)
 	{	//use defined background color and background images in dependency of focus mode
 		if (cc_parent->hasFocus()){

src/gui/components/cc_item.h

@@ -161,6 +161,9 @@ class CComponentsItem : public CComponents
 		void setHeightP(const uint8_t& h_percent);
 		///set item width, parameter as uint8_t, as percent value related to current width of parent form or screen
 		void setWidthP(const uint8_t& w_percent);
+
+		///signal on before init fb layers, called before init fb layers inside paintInit()
+		sigc::signal<void> OnBeforePaintInit;
 };
 
 #endif