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import textwrap
class Messages():
def __init__(self):
self.changed = False
self.messages = []
self.widget = None
self.scrolledBack = 0
def setWidget(self, widget):
self.widget = widget
def addMessage(self, message):
self.messages.append(message)
if self.scrolledBack:
self.scrolledBack += 1
self.widget.change()
def scroll(self, amount, relative=True):
if relative:
self.scrolledBack += amount
else:
self.scrolledBack = amount
self.scrolledBack = max(self.scrolledBack, 0)
self.widget.update()
self.widget.doUpdate()
def update(self, win):
width, height = win.getSize()
if height < 1:
return
lines = []
messages = self.messages
for message in messages:
lines += textwrap.wrap(message, width)
self.scrolledBack = max(min(self.scrolledBack, len(lines)-height), 0)
moreDown = False
if self.scrolledBack > 0:
lines = lines[:-self.scrolledBack]
moreDown = True
moreUp = False
if len(lines) > height:
moreUp = True
lines = lines[len(lines)-height:]
elif len(lines) < height:
lines = (height-len(lines)) * [""] + lines
win.erase()
for i, line in enumerate(lines):
win.addLine((0,i),line)
if moreUp:
win.addLine((width-1, 0), '-')
if moreDown:
win.addLine((width-1, height-1), '+')
win.noutrefresh()
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