CComponentsText: Add function getTextLinesAutoHeight()

- Function is used for determine the number of lines
  in a text box in AUTO_HIGH mode.

Signed-off-by: Thilo Graf <dbt@novatux.de>

src/gui/components/cc_item_text.cpp

@@ -273,3 +273,18 @@ string CComponentsText::iToString(int int_val)
 	string i_string(i_str.str());
 	return i_string;
 }
+
+//helper, get lines per textbox page
+int CComponentsText::getTextLinesAutoHeight(const int& textMaxHeight, const int& textWidth, const int& mode)
+{
+	CComponentsText box;
+	box.iX      = 0;
+	box.iY      = 0;
+	box.iWidth  = textWidth;
+	box.iHeight = textMaxHeight;
+
+	CTextBox tb(ct_text.c_str(), ct_font, mode, &box);
+	int ret = tb.getLinesPerPage();
+
+	return ret;
+}

src/gui/components/cc_item_text.h

@@ -133,6 +133,9 @@ class CComponentsText : public CComponentsItem, public CBox
 
 		///gets the embedded CTextBox object, so it's possible to get access directly to its methods and properties
 		virtual CTextBox* getCTextBoxObject() { return ct_textbox; };
+
+		///returns count of lines from a text box page
+		virtual int getTextLinesAutoHeight(const int& textMaxHeight, const int& textWidth, const int& mode);
 };