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|
#----------------------------------------------------------------------
# Name: wxPython.lib.grids
# Purpose: An example sizer derived from the C++ wxPySizer that
# sizes items in a fixed or flexible grid.
#
# Author: Robin Dunn
#
# Created: 21-Sept-1999
# RCS-ID: $Id$
# Copyright: (c) 1999 by Total Control Software
# Licence: wxWindows license
#----------------------------------------------------------------------
# 12/07/2003 - Jeff Grimmett (grimmtooth@softhome.net)
#
# o 2.5 Compatability changes
#
# 12/20/2003 - Jeff Grimmett (grimmtooth@softhome.net)
#
# o In keeping with the common idiom, the sizers in this module
# have been given the 'Py' prefix to avoid confusion with the
# native sizers of the same name. However, the reverse renamer
# still has the old wx*Sizer since the whole point of the
# reverse renamer is backward compatability.
# o wxGridSizer -> PyGridSizer
# o wxFlexGridSizer -> PyFlexGridSizer
# o Deprecation warning added.
#
"""
In this module you will find PyGridSizer and PyFlexGridSizer. Please
note that these sizers have since been ported to C++ (as wx.GridSizer
and wx.FlexGridSizer) and those versions are now exposed in the regular
wxPython wrappers. However I am also leaving them here in the library
so they can serve as an example of how to implement sizers in Python.
PyGridSizer: Sizes and positions items such that all rows are the same
height and all columns are the same width. You can specify a gap in
pixels to be used between the rows and/or the columns. When you
create the sizer you specify the number of rows or the number of
columns and then as you add items it figures out the other dimension
automatically. Like other sizers, items can be set to fill their
available space, or to be aligned on a side, in a corner, or in the
center of the space. When the sizer is resized, all the items are
resized the same amount so all rows and all columns remain the same
size.
PyFlexGridSizer: Derives from PyGridSizer and adds the ability for
particular rows and/or columns to be marked as growable. This means
that when the sizer changes size, the growable rows and colums are the
ones that stretch. The others remain at their initial size.
"""
import operator
import warnings
import wx
warningmsg = r"""\
################################################\
# THIS MODULE IS DEPRECATED |
# |
# You should use the native wx.GridSizer and |
# wx.FlexGridSizer unless there is a compelling |
# need to use this module. |
################################################/
"""
warnings.warn(warningmsg, DeprecationWarning, stacklevel=2)
#----------------------------------------------------------------------
class PyGridSizer(wx.PySizer):
def __init__(self, rows=0, cols=0, hgap=0, vgap=0):
wx.PySizer.__init__(self)
if rows == 0 and cols == 0:
raise ValueError, "rows and cols cannot both be zero"
self.rows = rows
self.cols = cols
self.hgap = hgap
self.vgap = vgap
def SetRows(self, rows):
if rows == 0 and self.cols == 0:
raise ValueError, "rows and cols cannot both be zero"
self.rows = rows
def SetColumns(self, cols):
if self.rows == 0 and cols == 0:
raise ValueError, "rows and cols cannot both be zero"
self.cols = cols
def GetRows(self):
return self.rows
def GetColumns(self):
return self.cols
def SetHgap(self, hgap):
self.hgap = hgap
def SetVgap(self, vgap):
self.vgap = vgap
def GetHgap(self, hgap):
return self.hgap
def GetVgap(self, vgap):
return self.vgap
#--------------------------------------------------
def CalcMin(self):
items = self.GetChildren()
nitems = len(items)
nrows = self.rows
ncols = self.cols
if ncols > 0:
nrows = (nitems + ncols-1) / ncols
else:
ncols = (nitems + nrows-1) / nrows
# Find the max width and height for any component.
w = 0
h = 0
for item in items:
size = item.CalcMin()
w = max(w, size.width)
h = max(h, size.height)
return wx.Size(ncols * w + (ncols-1) * self.hgap,
nrows * h + (nrows-1) * self.vgap)
#--------------------------------------------------
def RecalcSizes(self):
items = self.GetChildren()
if not items:
return
nitems = len(items)
nrows = self.rows
ncols = self.cols
if ncols > 0:
nrows = (nitems + ncols-1) / ncols
else:
ncols = (nitems + nrows-1) / nrows
sz = self.GetSize()
pt = self.GetPosition()
w = (sz.width - (ncols - 1) * self.hgap) / ncols;
h = (sz.height - (nrows - 1) * self.vgap) / nrows;
x = pt.x
for c in range(ncols):
y = pt.y
for r in range(nrows):
i = r * ncols + c
if i < nitems:
self.SetItemBounds(items[i], x, y, w, h)
y = y + h + self.vgap
x = x + w + self.hgap
#--------------------------------------------------
def SetItemBounds(self, item, x, y, w, h):
# calculate the item's size and position within
# its grid cell
ipt = wx.Point(x, y)
isz = item.CalcMin()
flag = item.GetFlag()
if flag & wx.EXPAND or flag & wx.SHAPED:
isz = (w, h)
else:
if flag & wx.ALIGN_CENTER_HORIZONTAL:
ipt.x = x + (w - isz.width) / 2
elif flag & wx.ALIGN_RIGHT:
ipt.x = x + (w - isz.width)
if flag & wx.ALIGN_CENTER_VERTICAL:
ipt.y = y + (h - isz.height) / 2
elif flag & wx.ALIGN_BOTTOM:
ipt.y = y + (h - isz.height)
item.SetDimension(ipt, isz)
#----------------------------------------------------------------------
class PyFlexGridSizer(PyGridSizer):
def __init__(self, rows=0, cols=0, hgap=0, vgap=0):
PyGridSizer.__init__(self, rows, cols, hgap, vgap)
self.rowHeights = []
self.colWidths = []
self.growableRows = []
self.growableCols = []
def AddGrowableRow(self, idx):
self.growableRows.append(idx)
def AddGrowableCol(self, idx):
self.growableCols.append(idx)
#--------------------------------------------------
def CalcMin(self):
items = self.GetChildren()
nitems = len(items)
nrows = self.rows
ncols = self.cols
if ncols > 0:
nrows = (nitems + ncols-1) / ncols
else:
ncols = (nitems + nrows-1) / nrows
# Find the max width and height for any component.
self.rowHeights = [0] * nrows
self.colWidths = [0] * ncols
for i in range(len(items)):
size = items[i].CalcMin()
row = i / ncols
col = i % ncols
self.rowHeights[row] = max(size.height, self.rowHeights[row])
self.colWidths[col] = max(size.width, self.colWidths[col])
# Add up all the widths and heights
cellsWidth = reduce(operator.__add__, self.colWidths)
cellHeight = reduce(operator.__add__, self.rowHeights)
return wx.Size(cellsWidth + (ncols-1) * self.hgap,
cellHeight + (nrows-1) * self.vgap)
#--------------------------------------------------
def RecalcSizes(self):
items = self.GetChildren()
if not items:
return
nitems = len(items)
nrows = self.rows
ncols = self.cols
if ncols > 0:
nrows = (nitems + ncols-1) / ncols
else:
ncols = (nitems + nrows-1) / nrows
minsz = self.CalcMin()
sz = self.GetSize()
pt = self.GetPosition()
# Check for growables
if self.growableRows and sz.height > minsz.height:
delta = (sz.height - minsz.height) / len(self.growableRows)
for idx in self.growableRows:
self.rowHeights[idx] = self.rowHeights[idx] + delta
if self.growableCols and sz.width > minsz.width:
delta = (sz.width - minsz.width) / len(self.growableCols)
for idx in self.growableCols:
self.colWidths[idx] = self.colWidths[idx] + delta
# bottom right corner
sz = wx.Size(pt.x + sz.width, pt.y + sz.height)
# Layout each cell
x = pt.x
for c in range(ncols):
y = pt.y
for r in range(nrows):
i = r * ncols + c
if i < nitems:
w = max(0, min(self.colWidths[c], sz.width - x))
h = max(0, min(self.rowHeights[r], sz.height - y))
self.SetItemBounds(items[i], x, y, w, h)
y = y + self.rowHeights[r] + self.vgap
x = x + self.colWidths[c] + self.hgap
#----------------------------------------------------------------------
|
