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12 <h1 ALIGN="CENTER">Pmw.RadioSelect</h1>
14 <center><IMG SRC=RadioSelect.gif ALT="" WIDTH=466 HEIGHT=272></center>
16 <dt> <h3>Name</h3></dt><dd>
17 <p>Pmw.RadioSelect() -
18 a set of buttons, some of which may be selected
23 <dt> <h3>Inherits</h3></dt><dd>
24 <a href="MegaWidget.html">Pmw.MegaWidget</a><br>
26 <dt> <h3>Description</h3></dt><dd>
28 A radio select is a container megawidget which manages a number of
29 buttons. The buttons may be laid out either horizontally or
30 vertically. In single selection mode, only one button may be
31 selected at any one time. In multiple selection mode, several
32 buttons may be selected at the same time and clicking on a
33 selected button will deselect it. </p>
35 <p> The buttons displayed can be either standard buttons, radio
36 buttons or check buttons. When selected, standard buttons are
37 displayed sunken and radio and check buttons are displayed with
38 the appropriate indicator color and relief.</p>
44 <dt> <h3>Options</h3></dt><dd>
45 Options for this megawidget and its base
46 classes are described below.<p></p>
47 <a name=option.buttontype></a>
48 <dl><dt> <strong>buttontype
50 Initialisation option. Specifies the default type of buttons created by the <code>add()</code>
51 method. If <strong>'button'</strong>, the default type is Tkinter.Button. If
52 <strong>'radiobutton'</strong>, the default type is Tkinter.Radiobutton. If
53 <strong>'checkbutton'</strong>, the default type is Tkinter.Checkbutton.</p>
54 <p> If <strong>'radiobutton'</strong>, single selection mode is automatically set.
55 If <strong>'checkbutton'</strong>, multiple selection mode is automatically set. The default is <strong>'button'</strong>.</p>
60 <a name=option.command></a>
61 <dl><dt> <strong>command
63 Specifies a function to call when one of the buttons is clicked on
64 or when <code>invoke()</code> is called.</p>
65 <p> In single selection mode, the function is called with a single
66 argument, which is the name of the selected button.</p>
68 <p> In multiple selection mode, the function is called with the first
69 argument being the name of the button and the second argument
70 being true if the button is now selected or false if it is now
71 deselected. The default is <strong>None</strong>.</p>
76 <a name=option.labelmargin></a>
77 <dl><dt> <strong>labelmargin
79 Initialisation option. If the <strong>labelpos</strong> option is not <strong>None</strong>, this specifies the
80 distance between the <strong>label</strong> component and the rest of the
81 megawidget. The default is <strong>0</strong>.</p>
85 <a name=option.labelpos></a>
86 <dl><dt> <strong>labelpos
88 Initialisation option. Specifies where to place the <strong>label</strong> component. If not
89 <strong>None</strong>, it should be a concatenation of one or two of the
90 letters <strong>'n'</strong>, <strong>'s'</strong>, <strong>'e'</strong> and <strong>'w'</strong>. The first letter
91 specifies on which side of the megawidget to place the label.
92 If a second letter is specified, it indicates where on that
93 side to place the label. For example, if <strong>labelpos</strong> is <strong>'w'</strong>,
94 the label is placed in the center of the left hand side; if
95 it is <strong>'wn'</strong>, the label is placed at the top of the left
96 hand side; if it is <strong>'ws'</strong>, the label is placed at the
97 bottom of the left hand side.</p>
98 <p> If <strong>None</strong>, a label component is not created. The default is <strong>None</strong>.</p>
103 <a name=option.orient></a>
104 <dl><dt> <strong>orient
106 Initialisation option. Specifies the direction in which the buttons are laid out. This
107 may be <strong>'horizontal'</strong> or <strong>'vertical'</strong>. The default is <strong>'horizontal'</strong>.</p>
111 <a name=option.padx></a>
112 <dl><dt> <strong>padx
114 Initialisation option. Specifies a padding distance to leave between each button in the x
115 direction and also between the buttons and the outer edge of the
116 radio select. The default is <strong>5</strong>.</p>
120 <a name=option.pady></a>
121 <dl><dt> <strong>pady
123 Initialisation option. Specifies a padding distance to leave between each button in the y
124 direction and also between the buttons and the outer edge of the
125 radio select. The default is <strong>5</strong>.</p>
129 <a name=option.selectmode></a>
130 <dl><dt> <strong>selectmode
132 Initialisation option. Specifies the selection mode: whether a single button or multiple
133 buttons can be selected at one time. If <strong>'single'</strong>, clicking on
134 an unselected button selects it and deselects all other buttons.
135 If <strong>'multiple'</strong>, clicking on an unselected button selects it and
136 clicking on a selected button deselects it. This option is
137 ignored if <strong>buttontype</strong> is <strong>'radiobutton'</strong> or <strong>'checkbutton'</strong>. The default is <strong>'single'</strong>.</p>
142 <dt> <h3>Components</h3></dt><dd>
143 Components created by this megawidget and its base
144 classes are described below.<p></p>
145 <a name=component.frame></a>
146 <dl><dt> <strong>frame
148 If the <strong>label</strong> component has been created (that is, the <strong>labelpos</strong>
149 option is not <strong>None</strong>), the <strong>frame</strong> component is created to act as
150 the container of the buttons created by the <code>add()</code> method. If
151 there is no <strong>label</strong> component, then no <strong>frame</strong> component is
152 created and the <strong>hull</strong> component acts as the container. By default, this component is a Tkinter.Frame.</p>
156 <a name=component.hull></a>
157 <dl><dt> <strong>hull
159 This acts as the body for the entire megawidget. Other components
160 are created as children of the hull to further specialise this
161 class. By default, this component is a Tkinter.Frame.</p>
165 <a name=component.label></a>
166 <dl><dt> <strong>label
168 If the <strong>labelpos</strong> option is not <strong>None</strong>, this component is
169 created as a text label for the megawidget. See the
170 <strong>labelpos</strong> option for details. Note that to set, for example,
171 the <strong>text</strong> option of the label, you need to use the <strong>label_text</strong>
172 component option. By default, this component is a Tkinter.Label.</p>
177 <dt> <h3>Dynamic components</h3></dt><dd>
179 Button components are created dynamically by the <code>add()</code>
180 method. The default type of the buttons depends on the value
181 of the <strong>buttontype</strong> option.</p>
183 <p> Button components are created with a component group of <strong>Button</strong>.</p>
190 <dt> <h3>Methods</h3></dt><dd>
191 Only methods specific to this megawidget are described below.
192 For a description of its inherited methods, see the
193 manual for its base class
194 <strong><a href="MegaWidget.html#methods">Pmw.MegaWidget</a></strong>.
196 <a name=method.add></a>
197 <dl><dt> <strong>add</strong>(<em>componentName</em>, **<em>kw</em>)</dt><dd>
198 Add a button to the end of the radio select as a component
199 named <em>componentName</em>. with a default type as specified by
200 <strong>buttontype</strong>. Any keyword arguments present (except <strong>command</strong>)
201 will be passed to the constructor when creating the button. If
202 the <strong>text</strong> keyword argument is not given, the <strong>text</strong> option of the
203 button defaults to <em>componentName</em>. The method returns the
204 component widget.</p>
208 <a name=method.button></a>
209 <dl><dt> <strong>button</strong>(<em>buttonIndex</em>)</dt><dd>
210 Return the button specified by <em>buttonIndex</em>, which may have any
211 of the forms accepted by the <code>index()</code> method.</p>
215 <a name=method.deleteall></a>
216 <dl><dt> <strong>deleteall</strong>()</dt><dd>
217 Delete all buttons and clear the current selection.</p>
221 <a name=method.getcurselection></a>
222 <dl><dt> <strong>getcurselection</strong>()</dt><dd>
223 Same as <code>getvalue()</code> method.</p>
227 <a name=method.getvalue></a>
228 <dl><dt> <strong>getvalue</strong>()</dt><dd>
229 In single selection mode, return the name of the currently
230 selected button, or <strong>None</strong> if no buttons have been selected yet.</p>
231 <p> In multiple selection mode, return a list of the names of the
232 currently selected buttons.</p>
237 <a name=method.index></a>
238 <dl><dt> <strong>index</strong>(<em>index</em>)</dt><dd>
239 Return the numerical index of the button corresponding to <em>index</em>.
240 This may be specified in any of the following forms:</p>
241 <dl><dt><em>name</em></dt><dd>Specifies the button named <em>name</em>.<p></p>
244 <dt><em>number</em></dt><dd>Specifies the button numerically, where <strong>0</strong> corresponds to
245 the left (or top) button.<p></p>
248 <dt><strong>Pmw.END</strong></dt><dd>Specifies the right (or bottom) button.<p></p>
254 <a name=method.invoke></a>
255 <dl><dt> <strong>invoke</strong>(<em>index</em>)</dt><dd>
256 Calling this method is the same as clicking on the button
257 specified by <em>index</em>: the buttons are displayed selected or
258 deselected according to the selection mode and <strong>command</strong> is
259 called. <em>index</em> may have any of the forms accepted by the
260 <code>index()</code> method. The value returned by <strong>command</strong> is returned.</p>
264 <a name=method.numbuttons></a>
265 <dl><dt> <strong>numbuttons</strong>()</dt><dd>
266 Return the number of buttons in the radio select.</p>
270 <a name=method.setvalue></a>
271 <dl><dt> <strong>setvalue</strong>(<em>textOrList</em>)</dt><dd>
272 Set the current selection for the radio select to <em>textOrList</em>,
273 but do not invoke <strong>command</strong>.</p>
274 <p> In single selection mode, select only the button specified by the
275 string <em>textOrList</em>.</p>
277 <p> In multiple selection mode, select only the buttons specified by
278 the list <em>textOrList</em>.</p>
284 <dt> <h3>Example</h3></dt><dd>
285 The image at the top of this manual is a snapshot
286 of the window (or part of the window) produced
287 by the following code.<p></p>
290 def __init__(self, parent):
291 # Create and pack a horizontal RadioSelect widget.
292 horiz = Pmw.RadioSelect(parent,
294 command = self.callback,
295 label_text = 'Horizontal',
296 frame_borderwidth = 2,
297 frame_relief = 'ridge'
299 horiz.pack(fill = 'x', padx = 10, pady = 10)
301 # Add some buttons to the horizontal RadioSelect.
302 for text in ('Fruit', 'Vegetables', 'Cereals', 'Legumes'):
304 horiz.invoke('Cereals')
306 # Create and pack a multiple selection RadioSelect widget.
307 self.multiple = Pmw.RadioSelect(parent,
309 command = self.multcallback,
310 label_text = 'Multiple\nselection',
311 frame_borderwidth = 2,
312 frame_relief = 'ridge',
313 selectmode = 'multiple',
315 self.multiple.pack(fill = 'x', padx = 10)
317 # Add some buttons to the multiple selection RadioSelect.
318 for text in ('Apricots', 'Eggplant', 'Rice', 'Lentils'):
319 self.multiple.add(text)
320 self.multiple.invoke('Rice')
322 # Create and pack a vertical RadioSelect widget, with checkbuttons.
323 self.checkbuttons = Pmw.RadioSelect(parent,
324 buttontype = 'checkbutton',
327 command = self.checkbuttoncallback,
328 label_text = 'Vertical,\nusing\ncheckbuttons',
329 hull_borderwidth = 2,
330 hull_relief = 'ridge',
332 self.checkbuttons.pack(side = 'left', expand = 1, padx = 10, pady = 10)
334 # Add some buttons to the checkbutton RadioSelect.
335 for text in ('Male', 'Female'):
336 self.checkbuttons.add(text)
337 self.checkbuttons.invoke('Male')
338 self.checkbuttons.invoke('Female')
340 # Create and pack a RadioSelect widget, with radiobuttons.
341 radiobuttons = Pmw.RadioSelect(parent,
342 buttontype = 'radiobutton',
345 command = self.callback,
346 label_text = 'Vertical,\nusing\nradiobuttons',
347 hull_borderwidth = 2,
348 hull_relief = 'ridge',
350 radiobuttons.pack(side = 'left', expand = 1, padx = 10, pady = 10)
352 # Add some buttons to the radiobutton RadioSelect.
353 for text in ('Male', 'Female', 'Both', 'Neither'):
354 radiobuttons.add(text)
355 radiobuttons.invoke('Both')
357 def callback(self, tag):
358 # This is called whenever the user clicks on a button
359 # in a single select RadioSelect widget.
360 print 'Button', tag, 'was pressed.'
362 def multcallback(self, tag, state):
363 # This is called whenever the user clicks on a button
364 # in the multiple select RadioSelect widget.
370 print 'Button', tag, 'was', action, \
371 'Selection:', self.multiple.getcurselection()
373 def checkbuttoncallback(self, tag, state):
374 # This is called whenever the user clicks on a button
375 # in the checkbutton RadioSelect widget.
381 print 'Button', tag, 'was', action, \
382 'Selection:', self.checkbuttons.getcurselection()
389 <center><P ALIGN="CENTER">
390 <IMG SRC = blue_line.gif ALT = "" WIDTH=320 HEIGHT=5>
395 <center><P ALIGN="CENTER">
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399 <br>Manual page last reviewed: 6 June 2002