Display now has scrolling text implemented in a python thread and error-screens, etc

client-barcode/freitagskasse.py

@@ -18,6 +18,9 @@ import os
 import time
 import urllib2
 
+from thread import start_new_thread, allocate_lock
+import time
+
 
 COLOR_HINT = Fore.YELLOW + Style.BRIGHT
 COLOR_ERROR = Fore.RED
@@ -32,8 +35,62 @@ COLOR_RESET = Style.RESET_ALL
 
 display_fifo = None
 
+scroll_line1 = None
+scroll_line2 = None
 
-def print_display(s):
+
+lock = allocate_lock()
+
+def display_handle_scroll(line,text,offset):
+	if (text):
+		send_display("\x1f\x24\x01%c%s" % (chr(line),text[offset:(20+offset)]))
+		l = len(text)
+		missing_chars=20+offset-l
+		if (missing_chars>0):
+			send_display(text[:missing_chars])
+		offset=((offset+1)%l)
+	else:
+		offset=0	#reset offset
+	return offset
+
+def display_scroll_text(line,text):
+	global scroll_line1,scroll_line2
+	lock.acquire()
+	if (line==1): #clear the line on invocation:
+		send_display("\x1f\x24\x01%c\x18" % chr(line) )
+		scroll_line1 = text
+	if (line==2): #clear the line on invocation:
+		send_display("\x1f\x24\x01%c\x18" % chr(line) )
+		scroll_line2 = text
+	lock.release()
+
+def display_screen(title,message):
+	if (len(title)<21):
+		send_display("\x1f\x24\x01%c\x18%s" % (chr(1),'\xdb'*20) )
+		if (len(title)<20):
+			pos=1+(20-len(title))/2
+		else:
+			pos=1
+		send_display("\x1f\x24%c%c%s" % (chr(pos),chr(1),title) )
+	else:
+		display_scroll_text(1,title)
+	display_scroll_text(2,message)
+	
+
+
+def display_thread(x):
+	global scroll_line1,scroll_line2
+	offset_line1=0
+	offset_line2=0
+	while(True):
+		lock.acquire()
+		offset_line1 = display_handle_scroll(1,scroll_line1,offset_line1)
+		offset_line2 = display_handle_scroll(2,scroll_line2,offset_line2)
+		lock.release()
+		time.sleep(.5)
+
+
+def send_display(s):
 	global display_fifo
 	if not display_fifo:
 		try:
@@ -55,6 +112,12 @@ def print_display(s):
 		pass
 		return
 
+def print_display(s):
+	lock.acquire()
+#	scroll_line1=None
+#	scroll_line2=None
+#	send_display(s)
+	lock.release()
 
 def clear():
 	os.system('clear')
@@ -399,9 +462,13 @@ def handle(line, status):
 def main():
 	colorama.init()
 	status = Status()
-
+	global scroll_line1,scroll_line2
 	print_display("\x1b\x40Kassensystem \n startet...")
+	start_new_thread(display_thread,(1,))
 
+	#display_scroll_text(1,"Line1: Text, dumm scrollend!")
+	#display_scroll_text(4,"Line2: Und hier Text, auch dumm scrollend!")
+	display_screen("HINWEIS","Herzlich willkommen bei der Freitagsrunde! *** ")
 	while True:
 		clear()
 		status.dump()