Lib/lib-stdwin/FormSplit.py

   1 # A FormSplit lets you place its children exactly where you want them
   2 # (including silly places!).
   3 # It does no explicit geometry management except moving its children
   4 # when it is moved.
   5 # The interface to place children is as follows.
   6 # Before you add a child, you may specify its (left, top) position
   7 # relative to the FormSplit.  If you don't specify a position for
   8 # a child, it goes right below the previous child; the first child
   9 # goes to (0, 0) by default.
  10 # NB: This places data attributes named form_* on its children.
  11 # XXX Yes, I know, there should be options to do all sorts of relative
  12 # placement, but for now this will do.
  13
  14 from Split import Split
  15
  16 class FormSplit(Split):
  17         #
  18         def create(self, parent):
  19                 self.next_left = self.next_top = 0
  20                 self.last_child = None
  21                 return Split.create(self, parent)
  22         #
  23         def getminsize(self, m, sugg_size):
  24                 max_width, max_height = 0, 0
  25                 for c in self.children:
  26                         c.form_width, c.form_height = c.getminsize(m, (0, 0))
  27                         max_width = max(max_width, c.form_width + c.form_left)
  28                         max_height = max(max_height, \
  29                                          c.form_height + c.form_top)
  30                 return max_width, max_height
  31         #
  32         def getbounds(self):
  33                 return self.bounds
  34         #
  35         def setbounds(self, bounds):
  36                 self.bounds = bounds
  37                 fleft, ftop = bounds[0]
  38                 for c in self.children:
  39                         left, top = c.form_left + fleft, c.form_top + ftop
  40                         right, bottom = left + c.form_width, top + c.form_height
  41                         c.setbounds(((left, top), (right, bottom)))
  42         #
  43         def placenext(self, left, top):
  44                 self.next_left = left
  45                 self.next_top = top
  46                 self.last_child = None
  47         #
  48         def addchild(self, child):
  49                 if self.last_child:
  50                         width, height = \
  51                             self.last_child.getminsize(self.beginmeasuring(), \
  52                                                        (0, 0))
  53                         self.next_top = self.next_top + height
  54                 child.form_left = self.next_left
  55                 child.form_top = self.next_top
  56                 Split.addchild(self, child)
  57                 self.last_child = child
  58         #