"""File selection dialog classes.Classes:- FileDialog- LoadFileDialog- SaveFileDialog"""from Tkinter import *from Dialog import Dialogimport osimport fnmatchdialogstates = {}class FileDialog:"""Standard file selection dialog -- no checks on selected file.Usage:d = FileDialog(master)fname = d.go(dir_or_file, pattern, default, key)if fname is None: ...canceled...else: ...open file...All arguments to go() are optional.The 'key' argument specifies a key in the global dictionary'dialogstates', which keeps track of the values for the directoryand pattern arguments, overriding the values passed in (it doesnot keep track of the default argument!). If no key is specified,the dialog keeps no memory of previous state. Note that memory iskept even when the dialog is canceled. (All this emulates thebehavior of the Macintosh file selection dialogs.)"""title = "File Selection Dialog"def __init__(self, master, title=None):if title is None: title = self.titleself.master = masterself.directory = Noneself.top = Toplevel(master)self.top.title(title)self.top.iconname(title)self.botframe = Frame(self.top)self.botframe.pack(side=BOTTOM, fill=X)self.selection = Entry(self.top)self.selection.pack(side=BOTTOM, fill=X)self.selection.bind('<Return>', self.ok_event)self.filter = Entry(self.top)self.filter.pack(side=TOP, fill=X)self.filter.bind('<Return>', self.filter_command)self.midframe = Frame(self.top)self.midframe.pack(expand=YES, fill=BOTH)self.filesbar = Scrollbar(self.midframe)self.filesbar.pack(side=RIGHT, fill=Y)self.files = Listbox(self.midframe, exportselection=0,yscrollcommand=(self.filesbar, 'set'))self.files.pack(side=RIGHT, expand=YES, fill=BOTH)btags = self.files.bindtags()self.files.bindtags(btags[1:] + btags[:1])self.files.bind('<ButtonRelease-1>', self.files_select_event)self.files.bind('<Double-ButtonRelease-1>', self.files_double_event)self.filesbar.config(command=(self.files, 'yview'))self.dirsbar = Scrollbar(self.midframe)self.dirsbar.pack(side=LEFT, fill=Y)self.dirs = Listbox(self.midframe, exportselection=0,yscrollcommand=(self.dirsbar, 'set'))self.dirs.pack(side=LEFT, expand=YES, fill=BOTH)self.dirsbar.config(command=(self.dirs, 'yview'))btags = self.dirs.bindtags()self.dirs.bindtags(btags[1:] + btags[:1])self.dirs.bind('<ButtonRelease-1>', self.dirs_select_event)self.dirs.bind('<Double-ButtonRelease-1>', self.dirs_double_event)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)self.top.protocol('WM_DELETE_WINDOW', self.cancel_command)# XXX Are the following okay for a general audience?self.top.bind('<Alt-w>', self.cancel_command)self.top.bind('<Alt-W>', self.cancel_command)def go(self, dir_or_file=os.curdir, pattern="*", default="", key=None):if key and dialogstates.has_key(key):self.directory, pattern = dialogstates[key]else:dir_or_file = os.path.expanduser(dir_or_file)if os.path.isdir(dir_or_file):self.directory = dir_or_fileelse:self.directory, default = os.path.split(dir_or_file)self.set_filter(self.directory, pattern)self.set_selection(default)self.filter_command()self.selection.focus_set()self.top.wait_visibility() # window needs to be visible for the grabself.top.grab_set()self.how = Noneself.master.mainloop() # Exited by self.quit(how)if key:directory, pattern = self.get_filter()if self.how:directory = os.path.dirname(self.how)dialogstates[key] = directory, patternself.top.destroy()return self.howdef quit(self, how=None):self.how = howself.master.quit() # Exit mainloop()def dirs_double_event(self, event):self.filter_command()def dirs_select_event(self, event):dir, pat = self.get_filter()subdir = self.dirs.get('active')dir = os.path.normpath(os.path.join(self.directory, subdir))self.set_filter(dir, pat)def files_double_event(self, event):self.ok_command()def files_select_event(self, event):file = self.files.get('active')self.set_selection(file)def ok_event(self, event):self.ok_command()def ok_command(self):self.quit(self.get_selection())def filter_command(self, event=None):dir, pat = self.get_filter()try:names = os.listdir(dir)except os.error:self.master.bell()returnself.directory = dirself.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.get_selection())if tail == os.curdir: tail = ''self.set_selection(tail)def get_filter(self):filter = self.filter.get()filter = os.path.expanduser(filter)if filter[-1:] == os.sep or os.path.isdir(filter):filter = os.path.join(filter, "*")return os.path.split(filter)def get_selection(self):file = self.selection.get()file = os.path.expanduser(file)return filedef cancel_command(self, event=None):self.quit()def set_filter(self, dir, pat):if not os.path.isabs(dir):try:pwd = os.getcwd()except os.error:pwd = Noneif pwd:dir = os.path.join(pwd, dir)dir = os.path.normpath(dir)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.get_selection()if not os.path.isfile(file):self.master.bell()else:self.quit(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.get_selection()if os.path.exists(file):if os.path.isdir(file):self.master.bell()returnd = Dialog(self.top,title="Overwrite Existing File Question",text="Overwrite existing file %r?" % (file,),bitmap='questhead',default=1,strings=("Yes", "Cancel"))if d.num != 0:returnelse:head, tail = os.path.split(file)if not os.path.isdir(head):self.master.bell()returnself.quit(file)def test():"""Simple test program."""root = Tk()root.withdraw()fd = LoadFileDialog(root)loadfile = fd.go(key="test")fd = SaveFileDialog(root)savefile = fd.go(key="test")print loadfile, savefileif __name__ == '__main__':test()
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