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By default, both are set to draw nothing, so setting the pen only before drawing the outer circle gives a circle contour Listing 6-23 Painting the outer and inner circles void CircleBar::paintEvent( QPaintEvent *event ) { int radius = width()/2; double factor = m_value/1000; QPainter p( this ); psetPen( Qt::black ); pdrawEllipse( 0, 0, width()-1, width()-1 ); psetBrush( Qt::black ); pdrawEllipse( (int)(radius*(10-factor)), (int)(radius*(10-factor)), (int)((width()-1)*factor)+1, (int)((width()-1)*factor)+1 ); } The final piece of the CircleBar widget is the wheelEvent method (see Listing 6-24) First the event is accepted before the value is updated using setValue The delta value of the QWheelEvent object tells how many eighths of a degree the scroll movement is Most mice scroll 15 degrees at a time, so each click in the scroll wheel corresponds to a delta of 120.

Save this in the templates directory as jinja.html. Now you need a new action in the greeting controller: def jinja(self): c.greeting = 'Hi from Jinja!' return render_jinja('/jinja.html') You ll need to import the Jinja render function: from pylons.templating import render_jinja If you test the example, you ll see the Hi from Jinja! greeting.

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One of the great benefits of choosing a web framework based on Python is the sheer breadth of software available for you to use, including a large number of templating languages. If you ve come from a background of Cheetah, Tal, Stan, Myghty, Kid, Breve, or any of the other templating languages available, you can easily integrate them into your Pylons application. The integration requires two steps: 1. Create a template lookup object attached to the app_globals object in config/ environment.py. 2. Create a render function, using the pylons_globals() and cached_template() functions if necessary, and use the template lookup attached to app_globals to render the template. Use the render_mako() function and config/environment.py listings from earlier in this chapter as a basis for your own code. If you need a further example, the Pylons documentation includes an example of how to integrate Kid via a custom render() function. You can read it at http://docs. pylonshq.com/views.html#custom-render-functions.

I chose to divide the delta value by 20 before using it to change the value I picked the value 20 by feel the bar is resized quickly enough while still giving enough precision Listing 6-24 Updating the value from scroll wheel movements void CircleBar::wheelEvent( QWheelEvent *event ) { event->accept(); setValue( value() + event->delta()/20 ); }.

s Caution Do not attempt to use a substitution cipher, or even a modification of one, in your own code! Substitution ciphers are easy for attackers to break using basic frequency and statistical analysis, as we shall describe shortly.

Note Previous versions of Pylons implemented template plug-in support via the TurboGears Buffet API. This API is deprecated in Pylons 0.9.7, although you can still use the API for legacy purposes if you need. See http://

Custom widgets consist of two parts: properties visible to the rest of the application (value and setValue) and event handlers (paintEvent and wheelEvent). Almost all custom widgets reimplement the paintEvent method, while the rest of the event handlers to reimplement are picked by determining which are needed to implement the functionality wanted.

docs.pylonshq.com/modules/templating.html#legacy-buffet-templating-plugin-and-renderfunctions for more information.

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