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| 55 | <H3><A NAME="SECTION0018165000000000000000"> |
| 56 | 16.1.6.5 The Window Manager</A> |
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| 58 | |
| 59 | <P> |
| 60 | In Tk, there is a utility command, <code>wm</code>, for interacting with the |
| 61 | window manager. Options to the <code>wm</code> command allow you to control |
| 62 | things like titles, placement, icon bitmaps, and the like. In |
| 63 | <tt class="module"><a href="module-Tkinter.html">Tkinter</a></tt>, these commands have been implemented as methods |
| 64 | on the <tt class="class">Wm</tt> class. Toplevel widgets are subclassed from the |
| 65 | <tt class="class">Wm</tt> class, and so can call the <tt class="class">Wm</tt> methods directly. |
| 66 | |
| 67 | <P> |
| 68 | To get at the toplevel window that contains a given widget, you can |
| 69 | often just refer to the widget's master. Of course if the widget has |
| 70 | been packed inside of a frame, the master won't represent a toplevel |
| 71 | window. To get at the toplevel window that contains an arbitrary |
| 72 | widget, you can call the <tt class="method">_root()</tt> method. This |
| 73 | method begins with an underscore to denote the fact that this function |
| 74 | is part of the implementation, and not an interface to Tk functionality. |
| 75 | |
| 76 | <P> |
| 77 | Here are some examples of typical usage: |
| 78 | |
| 79 | <P> |
| 80 | <div class="verbatim"><pre> |
| 81 | from Tkinter import * |
| 82 | class App(Frame): |
| 83 | def __init__(self, master=None): |
| 84 | Frame.__init__(self, master) |
| 85 | self.pack() |
| 86 | |
| 87 | |
| 88 | # create the application |
| 89 | myapp = App() |
| 90 | |
| 91 | # |
| 92 | # here are method calls to the window manager class |
| 93 | # |
| 94 | myapp.master.title("My Do-Nothing Application") |
| 95 | myapp.master.maxsize(1000, 400) |
| 96 | |
| 97 | # start the program |
| 98 | myapp.mainloop() |
| 99 | </pre></div> |
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