made scrolling of chat log possible

2 files changed, 30 insertions, 1 deletions

diff --git a/asciifarm/client/display/display.py b/asciifarm/client/display/display.py
index 7c5384d..d80703c 100644
--- a/asciifarm/client/display/display.py
+++ b/asciifarm/client/display/display.py
@@ -121,6 +121,9 @@ class Display:
     def addMessage(self, message):
         self.getWidget("msg").addMessage(message)
     
+    def scrollBack(self, amount, relative=True):
+        self.getWidget("msg").scroll(amount, relative)
+    
     def getChar(self, sprite):
         """This returns the character belonging to some spritename. This does not read a character"""
         return self.characters.get(sprite, self.defaultChar)
diff --git a/asciifarm/client/display/messagepad.py b/asciifarm/client/display/messagepad.py
index cae66a4..88ac3b4 100644
--- a/asciifarm/client/display/messagepad.py
+++ b/asciifarm/client/display/messagepad.py
@@ -8,24 +8,50 @@ class MessagePad():
         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 = self.widget.getWin()
         width, height = win.getSize()
         if height < 1:
             return
         lines = []
-        for message in self.messages:
+        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()
         win.addLine((0,0),'\n'.join(lines))
+        if moreUp:
+            win.addLine((width-1, 0), '-')
+        if moreDown:
+            win.addLine((width-1, height-1), '+')
         win.noutrefresh()