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In the same way that the next namespace allows you to refer to a def in the namespace of the child template immediately below it, Mako also provides a parent namespace that allows a child template to refer to a def in the parent template immediately above it. This is useful if you want a child template to be able to control where in a parent template its content is inserted.

.arg(event->x()) .arg(event->y()) .arg(event->reason()==QContextMenuEvent::Other "Other" : (event->reason()==QContextMenuEvent::Keyboard "Keyboard" : "Mouse")) ); } The context menu event carries the mouse position, as does the QMouseEvent. The mouse events are mousePressEvent, mouseReleaseEvent, mouseMoveEvent, and mouseDoubleClickEvent. You can see the latter in Listing 6-14. The handler shows the button as well as the x and y coordinates. When dealing with mouse events, it is important to understand that the movement event is sent only as long as a mouse button is pressed. If you need to get the movement event at all times, you must enable mouse tracking with the mouseTracking property. If you want to get all the mouse events, you can use the mouse just as you can use the keyboard. Use the methods grabMouse() and releaseMouse() for this. Just be careful because a bug occurring while the mouse is grabbed can prevent mouse interaction for all applications. The rule is to grab only when necessary, to release as soon as possible, and to never ever forget to release the mouse. Listing 6-14. A mouse event handling method void EventWidget::mouseDoubleClickEvent( QMouseEvent * event ) { emit gotEvent( QString("mouseDoubleClickEvent( x:%1, y:%2, button:%3 )") .arg( event->x() ) .arg( event->y() ) .arg( event->button()==Qt::LeftButton "LeftButton": event->button()==Qt::RightButton "RightButton": event->button()==Qt::MidButton "MidButton": event->button()==Qt::XButton1 "XButton1": "XButton2" ) ); }

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11. You may have noticed that the ampersand in tea & coffee is HTML-encoded as & in the form s input field. This is necessary because & is a metacharacter with special (though different) meanings both in URLs and in HTML. When submitting the form, the browser first HTML decodes the value of the input field, and then URL-encodes it before assembling the POST request.

Using the parent namespace might remind you of using super in a derived class to access a method in a base class in a normal Python inheritance structure. The two are similar, but in Python there is no equivalent to the next namespace; that is, you cannot access a child method from a parent class.

Working with the Mouse Wheel The mouse wheel is usually considered a part of the mouse, but the event has a separate event object. The object contains the position of the mouse pointer when the event occurs as well as the orientation of the wheel and the size of the scrolling (delta). The event handler is shown in Listing 6-15. The mouse wheel event is first sent to the widget under the mouse pointer. If it is not handled there, it is passed on to the widget with focus. Listing 6-15. The wheel is separate from the rest of the mouse. void EventWidget::wheelEvent( QWheelEvent * event ) { emit gotEvent( QString("wheelEvent( x:%1, y:%2, delta:%3, orientation:%4 )")

Let s change the way the title() def works so that greeting.html can decide whether to include the content from the section.html body() def. The first thing you need to do is change base.html so that it calls ${self.title()} rather than ${next.title()}. This means that when the title is rendered, control for rendering the def will pass to greeting.html, bypassing section.html. <html> <head> <title>${self.title()}</title> ... If you tested the example, you will see that the page title now displays Greetings again. Now let s change greeting.html so that the title also includes the section title. You d like the title to read User Administration > Greetings. Update the title() def in greeting.html to look like this: <%def name="title()">${parent.title()} > Greetings</%def> Now when control for rendering the title() def passes from base.html to greeting.html, the greeting.html title() def calls its parent template title() def where the User Administration string is rendered as expected. Using the parent namespace in this way is particularly useful when working with sections containing JavaScript or CSS, because you ll often find that it is useful to be able to control whether the JavaScript and CSS for the child template is rendered before or after that of the parent. In summary, the rule of thumb is that if the base template should have control of where the child content should be placed, use next. If the child template needs control of where its own content is placed, use parent.

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