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Text File  |  2005-11-19  |  9KB  |  274 lines
  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. import os
  15. import fnmatch
  16.  
  17.  
  18. dialogstates = {}
  19.  
  20.  
  21. class FileDialog:
  22.  
  23.     """Standard file selection dialog -- no checks on selected file.
  24.  
  25.     Usage:
  26.  
  27.         d = FileDialog(master)
  28.         fname = d.go(dir_or_file, pattern, default, key)
  29.         if fname is None: ...canceled...
  30.         else: ...open file...
  31.  
  32.     All arguments to go() are optional.
  33.  
  34.     The 'key' argument specifies a key in the global dictionary
  35.     'dialogstates', which keeps track of the values for the directory
  36.     and pattern arguments, overriding the values passed in (it does
  37.     not keep track of the default argument!).  If no key is specified,
  38.     the dialog keeps no memory of previous state.  Note that memory is
  39.     kept even when the dialog is canceled.  (All this emulates the
  40.     behavior of the Macintosh file selection dialogs.)
  41.  
  42.     """
  43.  
  44.     title = "File Selection Dialog"
  45.  
  46.     def __init__(self, master, title=None):
  47.         if title is None: title = self.title
  48.         self.master = master
  49.         self.directory = None
  50.  
  51.         self.top = Toplevel(master)
  52.         self.top.title(title)
  53.         self.top.iconname(title)
  54.  
  55.         self.botframe = Frame(self.top)
  56.         self.botframe.pack(side=BOTTOM, fill=X)
  57.  
  58.         self.selection = Entry(self.top)
  59.         self.selection.pack(side=BOTTOM, fill=X)
  60.         self.selection.bind('<Return>', self.ok_event)
  61.  
  62.         self.filter = Entry(self.top)
  63.         self.filter.pack(side=TOP, fill=X)
  64.         self.filter.bind('<Return>', self.filter_command)
  65.  
  66.         self.midframe = Frame(self.top)
  67.         self.midframe.pack(expand=YES, fill=BOTH)
  68.  
  69.         self.filesbar = Scrollbar(self.midframe)
  70.         self.filesbar.pack(side=RIGHT, fill=Y)
  71.         self.files = Listbox(self.midframe, exportselection=0,
  72.                              yscrollcommand=(self.filesbar, 'set'))
  73.         self.files.pack(side=RIGHT, expand=YES, fill=BOTH)
  74.         btags = self.files.bindtags()
  75.         self.files.bindtags(btags[1:] + btags[:1])
  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.         btags = self.dirs.bindtags()
  87.         self.dirs.bindtags(btags[1:] + btags[:1])
  88.         self.dirs.bind('<ButtonRelease-1>', self.dirs_select_event)
  89.         self.dirs.bind('<Double-ButtonRelease-1>', self.dirs_double_event)
  90.  
  91.         self.ok_button = Button(self.botframe,
  92.                                  text="OK",
  93.                                  command=self.ok_command)
  94.         self.ok_button.pack(side=LEFT)
  95.         self.filter_button = Button(self.botframe,
  96.                                     text="Filter",
  97.                                     command=self.filter_command)
  98.         self.filter_button.pack(side=LEFT, expand=YES)
  99.         self.cancel_button = Button(self.botframe,
  100.                                     text="Cancel",
  101.                                     command=self.cancel_command)
  102.         self.cancel_button.pack(side=RIGHT)
  103.  
  104.         self.top.protocol('WM_DELETE_WINDOW', self.cancel_command)
  105.         # XXX Are the following okay for a general audience?
  106.         self.top.bind('<Alt-w>', self.cancel_command)
  107.         self.top.bind('<Alt-W>', self.cancel_command)
  108.  
  109.     def go(self, dir_or_file=os.curdir, pattern="*", default="", key=None):
  110.         if key and dialogstates.has_key(key):
  111.             self.directory, pattern = dialogstates[key]
  112.         else:
  113.             dir_or_file = os.path.expanduser(dir_or_file)
  114.             if os.path.isdir(dir_or_file):
  115.                 self.directory = dir_or_file
  116.             else:
  117.                 self.directory, default = os.path.split(dir_or_file)
  118.         self.set_filter(self.directory, pattern)
  119.         self.set_selection(default)
  120.         self.filter_command()
  121.         self.selection.focus_set()
  122.         self.top.grab_set()
  123.         self.how = None
  124.         self.master.mainloop()          # Exited by self.quit(how)
  125.         if key:
  126.             directory, pattern = self.get_filter()
  127.             if self.how:
  128.                 directory = os.path.dirname(self.how)
  129.             dialogstates[key] = directory, pattern
  130.         self.top.destroy()
  131.         return self.how
  132.  
  133.     def quit(self, how=None):
  134.         self.how = how
  135.         self.master.quit()              # Exit mainloop()
  136.  
  137.     def dirs_double_event(self, event):
  138.         self.filter_command()
  139.  
  140.     def dirs_select_event(self, event):
  141.         dir, pat = self.get_filter()
  142.         subdir = self.dirs.get('active')
  143.         dir = os.path.normpath(os.path.join(self.directory, subdir))
  144.         self.set_filter(dir, pat)
  145.  
  146.     def files_double_event(self, event):
  147.         self.ok_command()
  148.  
  149.     def files_select_event(self, event):
  150.         file = self.files.get('active')
  151.         self.set_selection(file)
  152.  
  153.     def ok_event(self, event):
  154.         self.ok_command()
  155.  
  156.     def ok_command(self):
  157.         self.quit(self.get_selection())
  158.  
  159.     def filter_command(self, event=None):
  160.         dir, pat = self.get_filter()
  161.         try:
  162.             names = os.listdir(dir)
  163.         except os.error:
  164.             self.master.bell()
  165.             return
  166.         self.directory = dir
  167.         self.set_filter(dir, pat)
  168.         names.sort()
  169.         subdirs = [os.pardir]
  170.         matchingfiles = []
  171.         for name in names:
  172.             fullname = os.path.join(dir, name)
  173.             if os.path.isdir(fullname):
  174.                 subdirs.append(name)
  175.             elif fnmatch.fnmatch(name, pat):
  176.                 matchingfiles.append(name)
  177.         self.dirs.delete(0, END)
  178.         for name in subdirs:
  179.             self.dirs.insert(END, name)
  180.         self.files.delete(0, END)
  181.         for name in matchingfiles:
  182.             self.files.insert(END, name)
  183.         head, tail = os.path.split(self.get_selection())
  184.         if tail == os.curdir: tail = ''
  185.         self.set_selection(tail)
  186.  
  187.     def get_filter(self):
  188.         filter = self.filter.get()
  189.         filter = os.path.expanduser(filter)
  190.         if filter[-1:] == os.sep or os.path.isdir(filter):
  191.             filter = os.path.join(filter, "*")
  192.         return os.path.split(filter)
  193.  
  194.     def get_selection(self):
  195.         file = self.selection.get()
  196.         file = os.path.expanduser(file)
  197.         return file
  198.  
  199.     def cancel_command(self, event=None):
  200.         self.quit()
  201.  
  202.     def set_filter(self, dir, pat):
  203.         if not os.path.isabs(dir):
  204.             try:
  205.                 pwd = os.getcwd()
  206.             except os.error:
  207.                 pwd = None
  208.             if pwd:
  209.                 dir = os.path.join(pwd, dir)
  210.                 dir = os.path.normpath(dir)
  211.         self.filter.delete(0, END)
  212.         self.filter.insert(END, os.path.join(dir or os.curdir, pat or "*"))
  213.  
  214.     def set_selection(self, file):
  215.         self.selection.delete(0, END)
  216.         self.selection.insert(END, os.path.join(self.directory, file))
  217.  
  218.  
  219. class LoadFileDialog(FileDialog):
  220.  
  221.     """File selection dialog which checks that the file exists."""
  222.  
  223.     title = "Load File Selection Dialog"
  224.  
  225.     def ok_command(self):
  226.         file = self.get_selection()
  227.         if not os.path.isfile(file):
  228.             self.master.bell()
  229.         else:
  230.             self.quit(file)
  231.  
  232.  
  233. class SaveFileDialog(FileDialog):
  234.  
  235.     """File selection dialog which checks that the file may be created."""
  236.  
  237.     title = "Save File Selection Dialog"
  238.  
  239.     def ok_command(self):
  240.         file = self.get_selection()
  241.         if os.path.exists(file):
  242.             if os.path.isdir(file):
  243.                 self.master.bell()
  244.                 return
  245.             d = Dialog(self.top,
  246.                        title="Overwrite Existing File Question",
  247.                        text="Overwrite existing file %s?" % `file`,
  248.                        bitmap='questhead',
  249.                        default=1,
  250.                        strings=("Yes", "Cancel"))
  251.             if d.num != 0:
  252.                 return
  253.         else:
  254.             head, tail = os.path.split(file)
  255.             if not os.path.isdir(head):
  256.                 self.master.bell()
  257.                 return
  258.         self.quit(file)
  259.  
  260.  
  261. def test():
  262.     """Simple test program."""
  263.     root = Tk()
  264.     root.withdraw()
  265.     fd = LoadFileDialog(root)
  266.     loadfile = fd.go(key="test")
  267.     fd = SaveFileDialog(root)
  268.     savefile = fd.go(key="test")
  269.     print loadfile, savefile
  270.  
  271.  
  272. if __name__ == '__main__':
  273.     test()
  274.