Initial commit. Use looks like:

#include "Oled.h"
#include "MessageScroller.h"
#include "colors.h"

MessageScroller scroller = MessageScroller(&Display, &BLUE, &BLACK);
int i = 0;

void setup()
{
  Display.Initialize();
}

void loop()
{
  if(i%250 == 0)
    scroller.AddFormattedText("This is line %d", i);
  i++;
}

cores/touchStealth/MessageScroller.cpp

@@ -0,0 +1,81 @@
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "MessageScroller.h"
+#include "Oled.h"
+#include "oled_stealth.h"
+//#include "LcdConstants.h"
+//#include "lcd.h"
+#include "Colors.h"
+
+#define BUFFER_SIZE 25
+//#define TOP_MARGIN 3
+#define SIDE_MARGIN 3
+#define LINE_PADDING 2
+#define LINE_HEIGHT FONT_HEIGHT+LINE_PADDING
+
+
+MessageScroller::MessageScroller(Oled* oled, COLOR* textColor, COLOR* bgColor) {
+	usedLines = 0;
+	this->textColor = textColor;
+	this->bgColor = bgColor;
+	this->oled = oled;
+	offset = 0;
+}
+
+void MessageScroller::AddText(char* text) {
+	if(LCD_ROWS - usedLines <= LINE_HEIGHT ) {
+		ScrollScreen(LINE_HEIGHT - (LCD_ROWS-usedLines));
+	}
+	oled->DrawString(text, SIDE_MARGIN,
+		convertY(usedLines), textColor, bgColor);
+	usedLines += LINE_HEIGHT;
+}
+
+int MessageScroller::convertY(int y) {
+	int temp = y + offset;
+	if(temp >= LCD_ROWS)
+		return temp - LCD_ROWS;
+	else
+		return temp;
+}
+
+void wait(long length) {
+    for(long i = 0; i < length; i++) {
+      asm("nop");
+}}
+
+void MessageScroller::ScrollScreen(int rows) {
+	int temp = offset + rows;
+
+	if(temp >= LCD_ROWS) { // we must be spanning the boundary
+		temp -= LCD_ROWS;
+		//lcd_clear(0, offset, LCD_COLUMNS - 1, LCD_ROWS - 1, &BLACK);
+		//lcd_clear(0, 0, LCD_COLUMNS - 1, temp - 1, &BLACK);
+		oled->ClearRegion(0, offset, LCD_COLUMNS - 1, LCD_ROWS - 1);
+		wait(500);
+		if(temp > 0)
+			oled->ClearRegion(0, 0, LCD_COLUMNS - 1, temp - 1);
+		wait(500);
+	} else {
+		oled->ClearRegion(0, offset, LCD_COLUMNS - 1, temp - 1);
+		wait(500);
+	}
+	usedLines -= rows;
+	offset = temp;
+	oled->SetDisplayStartLine(offset);
+	return;
+}
+
+void MessageScroller::AddFormattedText(char* format, ...) {
+	static char msg_buffer[BUFFER_SIZE];
+
+	va_list argList;
+	va_start(argList, format);
+
+	vsprintf((char*)&msg_buffer, format, argList);
+
+	va_end(argList);
+
+	AddText(msg_buffer);
+}

cores/touchStealth/MessageScroller.h

@@ -0,0 +1,25 @@
+#ifndef MESSAGE_SCROLLER_H
+#define MESSAGE_SCROLLER_H
+
+//#include "DataTypes.h"
+#include "graphics.h"
+#include "Oled.h"
+#include "oled_stealth.h"
+
+class MessageScroller {
+	private:
+		int usedLines;
+		int offset;
+		COLOR* textColor;
+		COLOR* bgColor;
+		Oled* oled;
+		int convertY(int y) ;
+	public:
+		MessageScroller(Oled* oled, COLOR* textColor, COLOR* bgColor);
+		void AddFormattedText(char* format, ...);
+		void AddText(char* text);
+		void ScrollScreen(int rows);
+};
+
+
+#endif