dialog base class.
synopsis:
- DialogBase is a base class for dialog windows: MessageDialog and
- SelectionDialog
constructor arguments:
- parent (Tkinter handle) (optional, default=None)
handle of frame or other widget to pack plot in. if this is not specified, top-level is created.
- title (string) (optional, default="")
title to be placed on dialog window
protected methods:
- _gui: build grapical user-interface. derived classes supply
_gui_middle method to build middle frame
_mouse_wheel: mouse-wheel event callback
_page_key: page up/dn key event callback
public methods:
post dialog and wait for user response.