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"""File selection dialog classes.
Classes:
- FileDialog
- LoadFileDialog
- SaveFileDialog
XXX Bugs:
- The fields are not labeled
- Default doesn't have absolute pathname
- Each FileDialog instance can be used only once
- There is no easy way for an application to add widgets of its own
"""
from Tkinter import *
from Dialog import Dialog
ANCHOR = 'anchor'
import os
import fnmatch
class FileDialog:
"""Standard file selection dialog -- no checks on selected file.
Usage:
d = FileDialog(master)
file = d.go(directory, pattern, default)
if file is None: ...canceled...
"""
title = "File Selection Dialog"
def __init__(self, master):
self.master = master
self.directory = None
self.top = Toplevel(master)
self.top.title(self.title)
self.filter = Entry(self.top)
self.filter.pack(fill=X)
self.filter.bind('<Return>', self.filter_command)
self.midframe = Frame(self.top)
self.midframe.pack(expand=YES, fill=BOTH)
self.dirs = Listbox(self.midframe)
self.dirs.pack(side=LEFT, expand=YES, fill=BOTH)
self.dirs.bind('<ButtonRelease-1>', self.dirs_select_event)
self.dirs.bind('<Double-ButtonRelease-1>', self.dirs_double_event)
self.files = Listbox(self.midframe)
self.files.pack(side=RIGHT, expand=YES, fill=BOTH)
self.files.bind('<ButtonRelease-1>', self.files_select_event)
self.files.bind('<Double-ButtonRelease-1>', self.files_double_event)
self.selection = Entry(self.top)
self.selection.pack(fill=X)
self.selection.bind('<Return>', self.ok_event)
self.botframe = Frame(self.top)
self.botframe.pack(fill=X)
self.ok_button = Button(self.botframe,
text="OK",
command=self.ok_command)
self.ok_button.pack(side=LEFT)
self.filter_button = Button(self.botframe,
text="Filter",
command=self.filter_command)
self.filter_button.pack(side=LEFT, expand=YES)
self.cancel_button = Button(self.botframe,
text="Cancel",
command=self.cancel_command)
self.cancel_button.pack(side=RIGHT)
def go(self, directory=os.curdir, pattern="*", default=""):
self.directory = directory
self.set_filter(directory, pattern)
self.filter_command()
self.set_selection(default)
self.selection.focus_set()
self.top.grab_set()
try:
self.master.mainloop()
except SystemExit, how:
self.top.destroy()
return how
def dirs_double_event(self, event):
## self.dirs_select_event(event)
self.filter_command()
def dirs_select_event(self, event):
dir, pat = self.get_filter()
subdir = self.dirs.get(ANCHOR)
dir = os.path.normpath(os.path.join(self.directory, subdir))
self.set_filter(dir, pat)
def files_double_event(self, event):
## self.files_select_event(event)
## self.master.update_idletasks()
self.ok_command()
def files_select_event(self, event):
file = self.files.get(ANCHOR)
self.set_selection(file)
def ok_event(self, event):
self.ok_command()
def ok_command(self):
raise SystemExit, self.selection.get()
def filter_command(self, event=None):
dir, pat = self.get_filter()
try:
names = os.listdir(dir)
except os.error:
self.master.bell()
return
self.directory = dir
self.set_filter(dir, pat)
names.sort()
subdirs = [os.pardir]
matchingfiles = []
for name in names:
fullname = os.path.join(dir, name)
if os.path.isdir(fullname):
subdirs.append(name)
elif fnmatch.fnmatch(name, pat):
matchingfiles.append(name)
self.dirs.delete(0, END)
for name in subdirs:
self.dirs.insert(END, name)
self.files.delete(0, END)
for name in matchingfiles:
self.files.insert(END, name)
head, tail = os.path.split(self.selection.get())
if tail == os.curdir: tail = ''
self.set_selection(tail)
def get_filter(self):
filter = self.filter.get()
if filter[-1:] == os.sep:
filter = filter + "*"
return os.path.split(filter)
def cancel_command(self):
raise SystemExit, None
def set_filter(self, dir, pat):
self.filter.delete(0, END)
self.filter.insert(END, os.path.join(dir or os.curdir, pat or "*"))
def set_selection(self, file):
self.selection.delete(0, END)
self.selection.insert(END, os.path.join(self.directory, file))
class LoadFileDialog(FileDialog):
"""File selection dialog which checks that the file exists."""
title = "Load File Selection Dialog"
def ok_command(self):
file = self.selection.get()
if not os.path.isfile(file):
self.master.bell()
else:
raise SystemExit, file
class SaveFileDialog(FileDialog):
"""File selection dialog which checks that the file may be created."""
title = "Save File Selection Dialog"
def ok_command(self):
file = self.selection.get()
if os.path.exists(file):
if os.path.isdir(file):
self.master.bell()
return
d = Dialog(self.master,
title="Overwrite Existing File Question",
text="Overwrite existing file %s?" % `file`,
bitmap='questhead',
default=0,
strings=("Yes", "Cancel"))
if d.num != 0: file = None
else:
head, tail = os.path.split(file)
if not os.path.isdir(head):
self.master.bell()
return
raise SystemExit, file
def test():
"""Simple test program."""
root = Tk()
root.withdraw()
fd = LoadFileDialog(root)
loadfile = fd.go()
fd = SaveFileDialog(root)
savefile = fd.go()
print loadfile, savefile
if __name__ == '__main__':
test()
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