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<h1 ALIGN="CENTER">Pmw demonstrations and tests</h1>
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<p>
Pmw comes with an extensive range of demonstrations and tests. The
demonstrations can be used to get a feel for what is provided by Pmw
and the demonstration code can be viewed to see examples of how to
use Pmw. The tests can be executed to check that there are no
problems with running Pmw in your environment.
</p>
<dl>
<dt> <h2>Demonstrations</h2></dt><dd>
<p>
The Pmw <code>demos</code> directory contains demonstration scripts
showing many of the features of Pmw megawidgets. To view a
comprehensive package of all the demonstrations, including a view of
the source code, run the <code>All.py</code> script. Run
<code>All.py -help</code> for a short description of the script's
options.
<p>
All of the demonstrations may also be run separately. Most of the
demonstrations show some of the features of one of the Pmw
megawidgets. For example, to see a demonstration of the ButtonBox
megawidget, change into the <code>demos</code> directory and
run
</p>
<dl>
<dd>
<pre>
python ButtonBox.py
</pre>
</dd>
</dl>
<p>
Other demonstrations, which show other features of Pmw include
</p>
<dl>
<dd>
<pre>
BltGraph.py demonstrates the Pmw interface to
the BLT graph and vector commands
BltTabset.py demonstrates the Pmw interface to
the BLT tabset command
Colors.py how to set color schemes
ConfigClass.py how to configure the python class
of a megawidger component
ErrorHandling.py how Pmw displays run time errors
in a window
ExampleDemo.py template for new demonstrations
Grid.py the Tkinter Grid geometry manager
LogicalFont.py how to use standard values for fonts
MessageInfo.py how to extend the Pmw MegaToplevel
class
NestedDialogs.py how nested modal dialogs behave
Resources.py how to use the option database to
modify Tk widget option defaults
Resources_Pmw.py how to use the option database to
modify megawidget option defaults
ShowBusy.py demonstrates the Pmw interface to
the BLT busy command
SpecialEntry.py deriving from Pmw.EntryField
Spectrum.py some of the Pmw color handling
functions
SpeedTest.py tests the speed of creating Pmw
megawidgets
TextDisplay.py how to extend the Pmw MegaWidget
class
WidgetDestroy.py megawidget destruction
</pre>
</dd>
</dl>
<b>Creating demonstrations of new megawidgets</b>
<br>
<p>
If you create a new megawidget you can create a demonstration for it
by using the file
<a href="ExampleDemo.py"><code>ExampleDemo.py</code></a> as a
template. This template allows the demonstration to be run
individually or to be automatically included as part of the
demonstration package <code>All.py</code>. You should take a copy of
the template and name the new file after your megawidget. You should
then replace each instance of the word <code>EXAMPLE</code> with the
name of your megawidget and replace the code in the
<code>__init__</code> method with code to create and initialise one or
more instances of your megawidget, which should be a child of
<code>parent</code>. You can add other methods as necessary.
</p>
</dd>
<dt> <h2>Tests</h2></dt><dd>
<p>
The Pmw <code>tests</code> directory contains a test framework
and a set of test scripts for Pmw.
The tests cover the standard Tkinter module and most of the Pmw megawidgets.
The tests make a great
demonstration of the flexibility of the megawidgets. Simply change
into the <code>tests</code> directory and run
<code>python All.py</code>.
<p>
If all tests pass there should be no output printed to standard
output. If any of the tests fail, please send the test output to
the maintainer at
<a href="mailto:gregm@iname.com"><i>gregm@iname.com</i></a>.
</p>
<p>
All of the tests may be run separately. Most of the tests test the
features of one of the Pmw megawidgets. For example, to execute the
test for the ButtonBox megawidget, run
</p>
<dl>
<dd>
<pre>
python ButtonBox_test.py
</pre>
</dd>
</dl>
<p>
The Test.py file contains general testing functions and is imported
by all test files.
Other files, which test other features of Pmw include
</p>
<dl>
<dd>
<pre>
Blt_test.py BLT vector and graph interface
Colors_test.py setting color schemes
MegaWidget_test.py creation of megawidget classes
Options_test.py option and component handling
PmwBase_test.py more option and component handling
Tkinter_test.py Tk widgets in the Tkinter module
</pre>
</dd>
</dl>
<b>Creating tests for new megawidgets</b>
<br>
<p>
If you create a new megawidget you should create a test for it. There
is no template file for creating tests, but by looking at the other
Pmw tests (for example,
<a href="ScrolledText_test.py"><code>ScrolledText_test.py</code></a>) you
will get some idea of how to create a test for your megawidget.
</p>
<p>
The test files are designed to be run both individually or
automatically by the test package <code>All.py</code>. Each test file
must define the <code>testData</code> tuple. This consists of a
sequence of 2-element tuples, each tuple being a test specification
for one megawidget. Usually a file tests only one megawidget and so
there is only one test specification. The first element in the
specification is the megawidget class and the second is a sequence of
(yet more) 2-element tuples. In each of these tuples, the first
element is a sequence of individual tests to perform on an instance of
the megawidget and the second element is a dictionary to use for
the keyword arguments when creating the instance. Each individual
test is a tuple, the meaning of which depends on the type of the first
element, which may be either a string, a function or a method of the
megawidget class, as explained below.
</p>
<ul>
<li>
<p>
If the first element is a string, then it is treated as an option of
the megawidget and configure() is called to set the option to the
value specified by the second element. After setting the option,
cget() is called to query the option. If the test tuple has three
elements, then the value returned by cget() must equal the value
specified by the third element. Otherwise, the value returned must
equal the value specified by the second element. For example,
</p>
<dl>
<dd>
<pre>
('vscrollmode', 'static'),
('text_relief', 'sunken'),
('vscrollmode', 'bogus', 'ValueError: bad vscrollmode ' +
'option "bogus": should be static, dynamic, or none'),
</pre>
</dd>
</dl>
</li>
<li>
<p>
If the first element is a function or method, then the function or
method is called. The arguments to the call are given by the second
element. (As a special case, if the second element is not a tuple, it
is used as the only argument to the call.) The test tuple may have 2,
3 or 4 elements.
</p>
<ul>
<li>
<p>
If it has two elements, then the value returned by the call must be
None. For example,
</p>
<dl>
<dd>
<pre>
(c.exportfile, '/tmp/ScrolledText_test.py'),
(os.unlink, '/tmp/ScrolledText_test.py'),
</pre>
</dd>
</dl>
</li>
<li>
<p>
If it has four elements, then the third element is a dictionary to use
for the keyword arguments in the call and the value returned by the
call must equal the value specified by the fourth element. For
example,
</p>
<dl>
<dd>
<pre>
(c.search, ('abc', '0.0'), {'nocase': 1}, '2.24'),
</pre>
</dd>
</dl>
</li>
<li>
<p>
If is has three elements and the third element is a dictionary, then
it is used for the keyword arguments in the call and the value
returned by the call must be None. For example
</p>
<dl>
<dd>
<pre>
(c.configurepane, 'first', {'size' : 200}),
</pre>
</dd>
</dl>
</li>
<li>
<p>
If is has three elements and the third element is not a dictionary,
then the value returned by the call must equal the value specified by
the third element. For example,
</p>
<dl>
<dd>
<pre>
(c.components, (), ['hull', 'label']),
(c.add, ('Legumes',),
'ValueError: name "Legumes" already exists'),
</pre>
</dd>
</dl>
</li>
</ul>
</li>
</ul>
<p>
Some special functions and values supplied by the Test module that may
be used in the tests include:
</p>
<dl>
<dd>
<pre>
Test.callback callback taking no arguments
Test.callback1 callback taking one argument
Test.callbackN callback taking any number of arguments
Test.currentWidget returns the widget instance being tested
Test.num_options returns number of options for the widget
Test.earthris a sample Tkinter.PhotoImage
Test.flagup a sample Tkinter.BitmapImage
Test.floatvar a Tkinter.DoubleVar
Test.stringvar a Tkinter.StringVar
</pre>
</dd>
</dl>
<p>
To slow down a test (to see what is being displayed), add the
following line which sets the delay between tests to (say) 1000
milliseconds:
</p>
<dl>
<dd>
<pre>
Test.setdelay(1000)
</pre>
</dd>
</dl>
<p>
To print information about what is being tested, add the line:
</p>
<dl>
<dd>
<pre>
Test.setverbose(1)
</pre>
</dd>
</dl>
</dd>
</dl>
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Pmw 1.3 -
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