Tkinter Dialogs
***************


"tkinter.simpledialog" --- Standard Tkinter input dialogs
=========================================================

**Source code:** Lib/tkinter/simpledialog.py

======================================================================

The "tkinter.simpledialog" module contains convenience classes and
functions for creating simple modal dialogs to get a value from the
user.

tkinter.simpledialog.askfloat(title, prompt, **kw)
tkinter.simpledialog.askinteger(title, prompt, **kw)
tkinter.simpledialog.askstring(title, prompt, **kw)

   The above three functions provide dialogs that prompt the user to
   enter a value of the desired type.

class tkinter.simpledialog.Dialog(parent, title=None)

   The base class for custom dialogs.

      body(master)

         Override to construct the dialog's interface and return the
         widget that should have initial focus.

      buttonbox()

         Default behaviour adds OK and Cancel buttons. Override for
         custom button layouts.


"tkinter.filedialog" --- File selection dialogs
===============================================

**Source code:** Lib/tkinter/filedialog.py

======================================================================

The "tkinter.filedialog" module provides classes and factory functions
for creating file/directory selection windows.


Native Load/Save Dialogs
------------------------

The following classes and functions provide file dialog windows that
combine a native look-and-feel with configuration options to customize
behaviour. The following keyword arguments are applicable to the
classes and functions listed below:

      *parent* - the window to place the dialog on top of

      *title* - the title of the window

      *initialdir* - the directory that the dialog starts in

      *initialfile* - the file selected upon opening of the dialog

      *filetypes* - a sequence of (label, pattern) tuples, '*' wildcard is allowed

      *defaultextension* - default extension to append to file (save dialogs)

      *multiple* - when true, selection of multiple items is allowed

**Static factory functions**

The below functions when called create a modal, native look-and-feel
dialog, wait for the user's selection, then return the selected
value(s) or "None" to the caller.

tkinter.filedialog.askopenfile(mode="r", **options)
tkinter.filedialog.askopenfiles(mode="r", **options)

   The above two functions create an "Open" dialog and return the
   opened file object(s) in read-only mode.

tkinter.filedialog.asksaveasfile(mode="w", **options)

   Create a "SaveAs" dialog and return a file object opened in write-
   only mode.

tkinter.filedialog.askopenfilename(**options)
tkinter.filedialog.askopenfilenames(**options)

   The above two functions create an "Open" dialog and return the
   selected filename(s) that correspond to existing file(s).

tkinter.filedialog.asksaveasfilename(**options)

   Create a "SaveAs" dialog and return the selected filename.

tkinter.filedialog.askdirectory(**options)

      Prompt user to select a directory.
      Additional keyword option:
         *mustexist* - determines if selection must be an existing directory.

class tkinter.filedialog.Open(master=None, **options)
class tkinter.filedialog.SaveAs(master=None, **options)

   The above two classes provide native dialog windows for saving and
   loading files.

**Convenience classes**

The below classes are used for creating file/directory windows from
scratch. These do not emulate the native look-and-feel of the
platform.

class tkinter.filedialog.Directory(master=None, **options)

   Create a dialog prompting the user to select a directory.

注解: The *FileDialog* class should be subclassed for custom event
  handling and behaviour.

class tkinter.filedialog.FileDialog(master, title=None)

   Create a basic file selection dialog.

   cancel_command(event=None)

      Trigger the termination of the dialog window.

   dirs_double_event(event)

      Event handler for double-click event on directory.

   dirs_select_event(event)

      Event handler for click event on directory.

   files_double_event(event)

      Event handler for double-click event on file.

   files_select_event(event)

      Event handler for single-click event on file.

   filter_command(event=None)

      Filter the files by directory.

   get_filter()

      Retrieve the file filter currently in use.

   get_selection()

      Retrieve the currently selected item.

   go(dir_or_file=os.curdir, pattern="*", default="", key=None)

      Render dialog and start event loop.

   ok_event(event)

      Exit dialog returning current selection.

   quit(how=None)

      Exit dialog returning filename, if any.

   set_filter(dir, pat)

      Set the file filter.

   set_selection(file)

      Update the current file selection to *file*.

class tkinter.filedialog.LoadFileDialog(master, title=None)

   A subclass of FileDialog that creates a dialog window for selecting
   an existing file.

   ok_command()

      Test that a file is provided and that the selection indicates an
      already existing file.

class tkinter.filedialog.SaveFileDialog(master, title=None)

   A subclass of FileDialog that creates a dialog window for selecting
   a destination file.

      ok_command()

         Test whether or not the selection points to a valid file that
         is not a directory. Confirmation is required if an already
         existing file is selected.


"tkinter.commondialog" --- Dialog window templates
==================================================

**Source code:** Lib/tkinter/commondialog.py

======================================================================

The "tkinter.commondialog" module provides the "Dialog" class that is
the base class for dialogs defined in other supporting modules.

class tkinter.commondialog.Dialog(master=None, **options)

   show(color=None, **options)

      Render the Dialog window.

参见: Modules "tkinter.messagebox", 读写文件
