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# cbf_autoscrolled_window.py
# utilities to create windows with a both a vertical
# scroll bar and a horizontal scroll bar with each scroll bar
# disappearing when the window is large enough
#
# copyright (c) 2011 Herbert J. Bernstein
# portions from
# http://effbot.org/zone/tkinter-autoscrollbar.htm
# Autohiding Scrollbars
# August 08, 1998 | Fredrik Lundh
#
#
# for incorporation into the CBFlib package API
#
######################################################################
# #
# YOU MAY REDISTRIBUTE THE CBFLIB PACKAGE UNDER THE TERMS OF THE GPL #
# #
# ALTERNATIVELY YOU MAY REDISTRIBUTE THE CBFLIB API UNDER THE TERMS #
# OF THE LGPL #
# #
######################################################################
########################### GPL NOTICES ##############################
# #
# This program is free software; you can redistribute it and/or #
# modify it under the terms of the GNU General Public License as #
# published by the Free Software Foundation; either version 2 of #
# (the License, or (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program; if not, write to the Free Software #
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA #
# 02111-1307 USA #
# #
######################################################################
######################### LGPL NOTICES ###############################
# #
# This library is free software; you can redistribute it and/or #
# modify it under the terms of the GNU Lesser General Public #
# License as published by the Free Software Foundation; either #
# version 2.1 of the License, or (at your option) any later version. #
# #
# This library is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU #
# Lesser General Public License for more details. #
# #
# You should have received a copy of the GNU Lesser General Public #
# License along with this library; if not, write to the Free #
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, #
# MA 02110-1301 USA #
# #
######################################################################
import sys
try:
import Tkinter as TKINTER
import tkFileDialog as TKFILEDIALOG
except ImportError:
try:
import tkinter as TKINTER
import tkinter.filedialog as TKFILEDIALOG
except ImportError:
print("CBF: cbf_autoscrolled_window requires Tkinter")
sys.exit(1)
#################################################################
# The following autoscrollbar logic from
# http://effbot.org/zone/tkinter-autoscrollbar.htm
# Autohiding Scrollbars
# August 08, 1998 | Fredrik Lundh
#
class AutoScrollbar(TKINTER.Scrollbar):
# a scrollbar that hides itself if it's not needed. only
# works if you use the grid geometry manager.
__disabled = False
def set(self, lo, hi):
if self.__disabled or (float(lo) <= 0.0 and float(hi) >= 1.0):
# grid_remove is currently missing from Tkinter!
self.tk.call("grid", "remove", self)
else:
self.grid()
TKINTER.Scrollbar.set(self, lo, hi)
def pack(self, **kw):
raise TclError, "cannot use pack with this widget"
def place(self, **kw):
raise TclError, "cannot use place with this widget"
#################################################################
def disable(self):
self.__disabled = True
self.tk.call("grid", "remove", self)
def enable(self):
self.__disabled = False
self.grid()
class cbf_autoscrolled_window(TKINTER.Frame):
""" Class cbf_autoscrolled window returns an object
giving a frame and a canvas that are have visible
scroll bars when needed.
Use:
window=cbf_autoscrolled_window(rootwin)
... build scene in window.frame
window.frame.update_idletasks()
window.canvas.config(scrollregion=window.canvas.bbox(TKINTER.ALL))
rootwin.mainloop()
The frame is accessible as window.frame
The canvas is accessible as window.canvas
"""
def __cbf_create_autoscrolled_window(self,rootwin):
rootwin.grid_columnconfigure(0,weight=1)
rootwin.grid_columnconfigure(1,weight=0,minsize=8,pad=0)
rootwin.grid_rowconfigure(0,weight=1)
rootwin.grid_rowconfigure(1,weight=0,minsize=8,pad=0)
self.__hsb = AutoScrollbar(rootwin,orient=TKINTER.HORIZONTAL)
self.__hsb.grid(row=1,column=0, sticky="news")
self.__vsb = AutoScrollbar(rootwin)
self.__vsb.grid(row=0,column=1, sticky="news")
self.canvas = TKINTER.Canvas(rootwin, xscrollcommand=self.__hsb.set, \
yscrollcommand=self.__vsb.set)
self.__vsb.config(command=self.canvas.yview)
self.__hsb.config(command=self.canvas.xview)
self.canvas.grid(row=0,column=0,sticky="news")
self.frame = TKINTER.Frame(self.canvas)
self.canvas.create_window(0, 0, anchor=TKINTER.NW, window=self.frame)
self.frame.update_idletasks()
self.canvas.config(scrollregion=self.canvas.bbox(TKINTER.ALL))
self.frame.rowconfigure(1, weight=0, pad=0, minsize=10)
self.frame.rowconfigure(0, weight=1, pad=0, minsize=8)
self.frame.columnconfigure(1, weight=0, pad=0, minsize=10)
self.frame.columnconfigure(0, weight=1, pad=0, minsize=8)
def __init__(self,rootwin):
self.root=rootwin
self.canvas=None
self.__hsb=None
self.__vsb=None
self.frame=None
self.__cbf_create_autoscrolled_window(rootwin)
def horizontal_scroll_disable(self):
self.__hsb.disable()
def horizontal_scroll_enable(self):
self.__hsb.enable()
def vertical_scroll_disable(self):
self.__vsb.disable()
def vertical_scroll_enable(self):
self.__vsb.disable()
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