CComponentsForm: add member hideCCItems()

In case of items with cached background it is useful to have
possibility to restore their background. (eg. items are painted
outside of form).


Origin commit data
------------------
Branch: ni/coolstream
Commit: 19fc8c6d3b
Author: Thilo Graf <dbt@novatux.de>
Date: 2017-04-27 (Thu, 27 Apr 2017)



------------------
This commit was generated by Migit

src/gui/components/cc_frm.cpp

@@ -532,6 +532,12 @@ void CComponentsForm::killCCItems(const fb_pixel_t& bg_color, bool ignore_parent
 		v_cc_items[i]->kill(bg_color, ignore_parent);
 }
 
+void CComponentsForm::hideCCItems()
+{
+	for(size_t i=0; i<v_cc_items.size(); i++)
+		v_cc_items[i]->hide();
+}
+
 void CComponentsForm::setPageCount(const u_int8_t& pageCount)
 {
 	u_int8_t new_val = pageCount;

src/gui/components/cc_frm.h

@@ -81,6 +81,16 @@ class CComponentsForm : public CComponentsItem
 		///NOTE: Items always have parent bindings to "this" and use the parent background color as default! Set parameter 'ignore_parent=true' to ignore parent background color!
 		virtual void killCCItems(const fb_pixel_t& bg_color, bool ignore_parent);
 
+		/**
+		 Removes possible contained items and finally removes
+		 current form from screen and
+		 restores last displayed background before form was painted.
+		*/
+		void hide(){hideCCItems(); CCDraw::hide();}
+
+		///restore background for all items inside form,
+		void hideCCItems();
+
 		///add an item to form collection, returns id
 		virtual int addCCItem(CComponentsItem* cc_Item);
 		///add items from a vector to form collection, returns size/count of items

src/gui/components/cc_frm_header.h

@@ -299,7 +299,7 @@ class CComponentsHeader : public CComponentsForm, public CCTextScreen
 		virtual void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
 
 		///hides item, arg: no_restore see hideCCItem()
-		void hide(){disableClock(); CComponents::hide();}
+		void hide(){disableClock(); CComponentsForm::hide();}
 		///erase current screen without restore of background, it's similar to paintBackgroundBoxRel() from CFrameBuffer
 		void kill(const fb_pixel_t& bg_color = COL_BACKGROUND_PLUS_0, const int& corner_radius = -1, const int& fblayer_type = CC_FBDATA_TYPES, bool disable_clock = true);