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Python Source  |  1996-07-10  |  6.9 KB  |  268 lines  |  [TEXT/Pyth]
  1. """File selection dialog classes.
  2.  
  3. Classes:
  4.  
  5. - FileDialog
  6. - LoadFileDialog
  7. - SaveFileDialog
  8.  
  9. """
  10.  
  11. from Tkinter import *
  12. from Dialog import Dialog
  13.  
  14. ANCHOR = 'anchor'
  15.  
  16. import os
  17. import fnmatch
  18.  
  19.  
  20. dialogstates = {}
  21.  
  22.  
  23. class FileDialog:
  24.  
  25.     """Standard file selection dialog -- no checks on selected file.
  26.  
  27.     Usage:
  28.  
  29.         d = FileDialog(master)
  30.         file = d.go(dir_or_file, pattern, default, key)
  31.         if file is None: ...canceled...
  32.     else: ...open file...
  33.  
  34.     All arguments to go() are optional.
  35.  
  36.     The 'key' argument specifies a key in the global dictionary
  37.     'dialogstates', which keeps track of the values for the directory
  38.     and pattern arguments, overriding the values passed in (it does
  39.     not keep track of the default argument!).  If no key is specified,
  40.     the dialog keeps no memory of previous state.  Note that memory is
  41.     kept even when the dialog is cancelled.  (All this emulates the
  42.     behavior of the Macintosh file selection dialogs.)
  43.  
  44.     """
  45.  
  46.     title = "File Selection Dialog"
  47.  
  48.     def __init__(self, master, title=None):
  49.     if title is None: title = self.title
  50.     self.master = master
  51.     self.directory = None
  52.  
  53.     self.top = Toplevel(master)
  54.     self.top.title(title)
  55.     self.top.iconname(title)
  56.  
  57.     self.botframe = Frame(self.top)
  58.     self.botframe.pack(side=BOTTOM, fill=X)
  59.  
  60.     self.selection = Entry(self.top)
  61.     self.selection.pack(side=BOTTOM, fill=X)
  62.     self.selection.bind('<Return>', self.ok_event)
  63.  
  64.     self.filter = Entry(self.top)
  65.     self.filter.pack(side=TOP, fill=X)
  66.     self.filter.bind('<Return>', self.filter_command)
  67.  
  68.     self.midframe = Frame(self.top)
  69.     self.midframe.pack(expand=YES, fill=BOTH)
  70.  
  71.     self.filesbar = Scrollbar(self.midframe)
  72.     self.filesbar.pack(side=RIGHT, fill=Y)
  73.     self.files = Listbox(self.midframe, exportselection=0,
  74.                  yscrollcommand=(self.filesbar, 'set'))
  75.     self.files.pack(side=RIGHT, expand=YES, fill=BOTH)
  76.     self.files.bind('<ButtonRelease-1>', self.files_select_event)
  77.     self.files.bind('<Double-ButtonRelease-1>', self.files_double_event)
  78.     self.filesbar.config(command=(self.files, 'yview'))
  79.  
  80.     self.dirsbar = Scrollbar(self.midframe)
  81.     self.dirsbar.pack(side=LEFT, fill=Y)
  82.     self.dirs = Listbox(self.midframe, exportselection=0,
  83.                 yscrollcommand=(self.dirsbar, 'set'))
  84.     self.dirs.pack(side=LEFT, expand=YES, fill=BOTH)
  85.     self.dirsbar.config(command=(self.dirs, 'yview'))
  86.     self.dirs.bind('<ButtonRelease-1>', self.dirs_select_event)
  87.     self.dirs.bind('<Double-ButtonRelease-1>', self.dirs_double_event)
  88.  
  89.     self.ok_button = Button(self.botframe,
  90.                  text="OK",
  91.                  command=self.ok_command)
  92.     self.ok_button.pack(side=LEFT)
  93.     self.filter_button = Button(self.botframe,
  94.                     text="Filter",
  95.                     command=self.filter_command)
  96.     self.filter_button.pack(side=LEFT, expand=YES)
  97.     self.cancel_button = Button(self.botframe,
  98.                     text="Cancel",
  99.                     command=self.cancel_command)
  100.     self.cancel_button.pack(side=RIGHT)
  101.  
  102.     self.top.protocol('WM_DELETE_WINDOW', self.cancel_command)
  103.     # XXX Are the following okay for a general audience?
  104.     self.top.bind('<Alt-w>', self.cancel_command)
  105.     self.top.bind('<Alt-W>', self.cancel_command)
  106.  
  107.     def go(self, dir_or_file=os.curdir, pattern="*", default="", key=None):
  108.     if key and dialogstates.has_key(key):
  109.         self.directory, pattern = dialogstates[key]
  110.     else:
  111.         dir_or_file = os.path.expanduser(dir_or_file)
  112.         if os.path.isdir(dir_or_file):
  113.         self.directory = dir_or_file
  114.         else:
  115.         self.directory, default = os.path.split(dir_or_file)
  116.     self.set_filter(self.directory, pattern)
  117.     self.set_selection(default)
  118.     self.filter_command()
  119.     self.selection.focus_set()
  120.     self.top.grab_set()
  121.     self.how = None
  122.     self.master.mainloop()        # Exited by self.quit(how)
  123.     if key: dialogstates[key] = self.get_filter()
  124.     self.top.destroy()
  125.     return self.how
  126.  
  127.     def quit(self, how=None):
  128.     self.how = how
  129.     self.master.quit()        # Exit mainloop()
  130.  
  131.     def dirs_double_event(self, event):
  132.     self.filter_command()
  133.  
  134.     def dirs_select_event(self, event):
  135.     dir, pat = self.get_filter()
  136.     subdir = self.dirs.get(ANCHOR)
  137.     dir = os.path.normpath(os.path.join(self.directory, subdir))
  138.     self.set_filter(dir, pat)
  139.  
  140.     def files_double_event(self, event):
  141.     self.ok_command()
  142.  
  143.     def files_select_event(self, event):
  144.     file = self.files.get(ANCHOR)
  145.     self.set_selection(file)
  146.  
  147.     def ok_event(self, event):
  148.     self.ok_command()
  149.  
  150.     def ok_command(self):
  151.     self.quit(self.get_selection())
  152.  
  153.     def filter_command(self, event=None):
  154.     dir, pat = self.get_filter()
  155.     try:
  156.         names = os.listdir(dir)
  157.     except os.error:
  158.         self.master.bell()
  159.         return
  160.     self.directory = dir
  161.     self.set_filter(dir, pat)
  162.     names.sort()
  163.     subdirs = [os.pardir]
  164.     matchingfiles = []
  165.     for name in names:
  166.         fullname = os.path.join(dir, name)
  167.         if os.path.isdir(fullname):
  168.         subdirs.append(name)
  169.         elif fnmatch.fnmatch(name, pat):
  170.         matchingfiles.append(name)
  171.     self.dirs.delete(0, END)
  172.     for name in subdirs:
  173.         self.dirs.insert(END, name)
  174.     self.files.delete(0, END)
  175.     for name in matchingfiles:
  176.         self.files.insert(END, name)
  177.     head, tail = os.path.split(self.get_selection())
  178.     if tail == os.curdir: tail = ''
  179.     self.set_selection(tail)
  180.  
  181.     def get_filter(self):
  182.     filter = self.filter.get()
  183.     filter = os.path.expanduser(filter)
  184.     if filter[-1:] == os.sep or os.path.isdir(filter):
  185.         filter = os.path.join(filter, "*")
  186.     return os.path.split(filter)
  187.  
  188.     def get_selection(self):
  189.     file = self.selection.get()
  190.     file = os.path.expanduser(file)
  191.     return file
  192.  
  193.     def cancel_command(self, event=None):
  194.     self.quit()
  195.  
  196.     def set_filter(self, dir, pat):
  197.     if not os.path.isabs(dir):
  198.         try:
  199.         pwd = os.getcwd()
  200.         except os.error:
  201.         pwd = None
  202.         if pwd:
  203.         dir = os.path.join(pwd, dir)
  204.         dir = os.path.normpath(dir)
  205.     self.filter.delete(0, END)
  206.     self.filter.insert(END, os.path.join(dir or os.curdir, pat or "*"))
  207.  
  208.     def set_selection(self, file):
  209.     self.selection.delete(0, END)
  210.     self.selection.insert(END, os.path.join(self.directory, file))
  211.  
  212.  
  213. class LoadFileDialog(FileDialog):
  214.  
  215.     """File selection dialog which checks that the file exists."""
  216.  
  217.     title = "Load File Selection Dialog"
  218.  
  219.     def ok_command(self):
  220.     file = self.get_selection()
  221.     if not os.path.isfile(file):
  222.         self.master.bell()
  223.     else:
  224.         self.quit(file)
  225.  
  226.  
  227. class SaveFileDialog(FileDialog):
  228.  
  229.     """File selection dialog which checks that the file may be created."""
  230.  
  231.     title = "Save File Selection Dialog"
  232.  
  233.     def ok_command(self):
  234.     file = self.get_selection()
  235.     if os.path.exists(file):
  236.         if os.path.isdir(file):
  237.         self.master.bell()
  238.         return
  239.         d = Dialog(self.top,
  240.                title="Overwrite Existing File Question",
  241.                text="Overwrite existing file %s?" % `file`,
  242.                bitmap='questhead',
  243.                default=1,
  244.                strings=("Yes", "Cancel"))
  245.         if d.num != 0:
  246.         return
  247.     else:
  248.         head, tail = os.path.split(file)
  249.         if not os.path.isdir(head):
  250.         self.master.bell()
  251.         return
  252.     self.quit(file)
  253.  
  254.  
  255. def test():
  256.     """Simple test program."""
  257.     root = Tk()
  258.     root.withdraw()
  259.     fd = LoadFileDialog(root)
  260.     loadfile = fd.go(key="test")
  261.     fd = SaveFileDialog(root)
  262.     savefile = fd.go(key="test")
  263.     print loadfile, savefile
  264.  
  265.  
  266. if __name__ == '__main__':
  267.     test()
  268.