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#-------------------------------------------------------------------------------
#
# Defines a horizontal or vertical flow layout sizer for wxPython
#
# Written by: David C. Morrill
#
# Date: 01/12/2006
#
# (c) Copyright 2006 by Enthought, Inc.
#
#-------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
import wx
from enthought.pyface.timer.api \
import do_later
#-------------------------------------------------------------------------------
# 'FlowSizer' class:
#-------------------------------------------------------------------------------
class FlowSizer ( wx.PySizer ):
#---------------------------------------------------------------------------
# Initializes the object:
#---------------------------------------------------------------------------
def __init__ ( self, orient = wx.HORIZONTAL ):
super( FlowSizer, self ).__init__()
self._orient = orient
self._frozen = False
self._needed_size = None
#---------------------------------------------------------------------------
# Calculates the minimum size needed by the sizer:
#---------------------------------------------------------------------------
def CalcMin ( self ):
""" Calculates the minimum size needed by the sizer.
"""
if self._needed_size is not None:
return self._needed_size
horizontal = (self._orient == wx.HORIZONTAL)
dx = dy = i = 0
while True:
try:
item = self.GetItem( i )
if item is None:
break
i += 1
except:
break
idx, idy = item.CalcMin()
if horizontal:
dy = max( dy, idy )
else:
dx = max( dx, idx )
return wx.Size( dx, dy )
#---------------------------------------------------------------------------
# Layout the contents of the sizer based on the sizer's current size and
# position:
#---------------------------------------------------------------------------
def RecalcSizes ( self ):
""" Layout the contents of the sizer based on the sizer's current size
and position.
"""
horizontal = (self._orient == wx.HORIZONTAL)
x, y = self.GetPosition()
dx, dy = self.GetSize()
x0, y0 = x, y
ex = x + dx
ey = y + dy
mdx = mdy = sdx = sdy = i = 0
visible = True
cur_max = 0
while True:
try:
item = self.GetItem( i )
if item is None:
break
i += 1
except:
break
idx, idy = item.CalcMin()
expand = item.GetFlag() & wx.EXPAND
if horizontal:
if (x > x0) and ((x + idx) > ex):
x = x0
y += (mdy + sdy)
mdy = sdy = 0
if y >= ey:
visible = False
cur_max = max( idy, cur_max )
if expand:
idy = cur_max
if item.IsSpacer():
sdy = max( sdy, idy )
if x == x0:
idx = 0
item.SetDimension( wx.Point( x, y ), wx.Size( idx, idy ) )
item.Show( visible )
x += idx
mdy = max( mdy, idy )
else:
if (y > y0) and ((y + idy) > ey):
y = y0
x += (mdx + sdx)
mdx = sdx = 0
if x >= ex:
visible = False
cur_max = max( idx, cur_max )
if expand:
idx = cur_max
if item.IsSpacer():
sdx = max( sdx, idx )
if y == y0:
idy = 0
item.SetDimension( wx.Point( x, y ), wx.Size( idx, idy ) )
item.Show( visible )
y += idy
mdx = max( mdx, idx )
if (not visible) and (self._needed_size is None):
max_dx = max_dy = 0
if horizontal:
max_dy = max( dy, y + mdy + sdy - y0 )
else:
max_dx = max( dx, x + mdx + sdx - x0 )
self._needed_size = wx.Size( max_dx, max_dy )
if not self._frozen:
self._do_parent( '_freeze' )
do_later( self._do_parent, '_thaw' )
else:
self._needed_size = None
#---------------------------------------------------------------------------
# Prevents the specified window from doing any further screen updates:
#---------------------------------------------------------------------------
def _freeze ( self, window ):
""" Prevents the specified window from doing any further screen updates.
"""
window.Freeze()
self._frozen = True
#---------------------------------------------------------------------------
# Lays out a specified window and then allows it to be updated again:
#---------------------------------------------------------------------------
def _thaw ( self, window ):
""" Lays out a specified window and then allows it to be updated again.
"""
window.Layout()
window.Refresh()
if self._frozen:
self._frozen = False
window.Thaw()
#---------------------------------------------------------------------------
# Does a specified operation on the sizer's parent window:
#---------------------------------------------------------------------------
def _do_parent ( self, method ):
""" Does a specified operation on the sizer's parent window.
"""
i = 0
while True:
try:
item = self.GetItem( i )
if item is None:
break
i += 1
except:
return
if item.IsWindow():
getattr( self, method )( item.GetWindow().GetParent() )
return
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