Lib/lib-stdwin/listwin.py

   1 # Module 'listwin'
   2 # List windows, a subclass of gwin
   3
   4 import gwin
   5 import stdwin
   6
   7 def maxlinewidth(a): # Compute maximum textwidth of lines in a sequence
   8         max = 0
   9         for line in a:
  10                 width = stdwin.textwidth(line)
  11                 if width > max: max = width
  12         return max
  13
  14 def action(w, string, i, detail): # Default item selection method
  15         pass
  16
  17 def mup(w, detail): # Mouse up method
  18         (h, v), clicks, button, mask = detail
  19         i = divmod(v, w.lineheight)[0]
  20         if 0 <= i < len(w.data):
  21                 w.action(w, w.data[i], i, detail)
  22
  23 def draw(w, ((left, top), (right, bottom))): # Text window draw method
  24         data = w.data
  25         d = w.begindrawing()
  26         lh = w.lineheight
  27         itop = top/lh
  28         ibot = (bottom-1)/lh + 1
  29         if itop < 0: itop = 0
  30         if ibot > len(data): ibot = len(data)
  31         for i in range(itop, ibot): d.text((0, i*lh), data[i])
  32
  33 def open(title, data): # Display a list of texts in a window
  34         lineheight = stdwin.lineheight()
  35         h, v = maxlinewidth(data), len(data)*lineheight
  36         h0, v0 = h + stdwin.textwidth(' '), v + lineheight
  37         if h0 > stdwin.textwidth(' ')*80: h0 = 0
  38         if v0 > stdwin.lineheight()*24: v0 = 0
  39         stdwin.setdefwinsize(h0, v0)
  40         w = gwin.open(title)
  41         w.setdocsize(h, v)
  42         w.lineheight = lineheight
  43         w.data = data
  44         w.draw = draw
  45         w.action = action
  46         w.mup = mup
  47         return w