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Figure 3-8. Grid layout With layouts, the sizing policies of the widgets involved play an important role. For example, push button widgets are by default Fixed in the vertical direction. This means that if you rotate the layout from Listing 3-4 so that columns are rows (and vice versa), the result will look like Figure 3-9. The button does not stretch to fill two cells; instead it is centered vertically, but keeps the height from the size hint of the widget.

This means the AuthKit middleware adds a sign-out function to the environ dictionary under the key 'pasteauth_tktlogout_user' If you call this function, the middleware will remove the cookie from the headers after the response is returned Now that you know this, you can write a new action that signs the user out and displays the sign-in form: Add this action to the account controller: def signinagain(self): requestenviron['pasteauth_tktlogout_user']() return render('/derived/account/signinhtml')replace('%s', hurl_for('signin')).

It is possible to use other layout classes, but it is not very common to use them directly. The box layouts and grid layout are usually all you need; combined with stretch factors and sizing policies, you can build pretty much any conceivable dialog layout.

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lib: The lib directory is where you can put Python code that is used between different controllers, third-party code, or any other code that doesn t fit in well elsewhere. model: The model directory is for your model objects; if you re using an object-relational mapper such as SQLAlchemy, this is where your tables, classes, and relations should be defined. You ll look at using SQLAlchemy as a model in 7. public: You ve already seen the public directory. It is similar to the htdocs directory in Apache and is where you put all your HTML, images, JavaScript, CSS, and other static files. templates: The templates directory is where view templates are stored. tests: The tests directory is where you can put automated unit tests for your application. __init__.py: The __init__.py file is present so that the helloworld directory can be imported as a Python module within the egg. websetup.py: The websetup.py contains any code that should be executed when an end user has installed your Pylons application and needs to initialize it. It frequently contains code to create the database tables required by your application, for example. We ll discuss this in 8.

In the following example, we show some JavaScript that can be used to help compute the price of an order: <HTML> <HEAD> <TITLE>Order Pizza</TITLE> </HEAD> <BODY> <FORM ACTION="submit_order" METHOD="GET" NAME="f"> How many pizzas would you like to order <INPUT TYPE="text" NAME="qty" VALUE="1" onKeyUp="computePrice();"> <INPUT TYPE="hidden" NAME="price" VALUE="550"><BR> <INPUT TYPE="submit" NAME ="Order" VALUE="Pay"> <INPUT TYPE="submit" NAME ="Cancel" VALUE="Cancel"> <SCRIPT> function computePrice() { fpricevalue = 550 * fqtyvalue; fOrdervalue = "Pay $" + fpricevalue } </SCRIPT> </BODY> </HTML> The preceding pizza order form looks similar to ones used earlier in the chapter, with just a few differences that help the browser compute the price of the order First, the form has been given a name attribute that specifies that its name is f.

It s now time to learn how to generate the message dynamically using a Pylons controller Controllers are the basic building blocks of Pylons applications They contain all the programming logic and can be thought of as mini-applications Controllers are implemented as Python classes Each method of the class is known in Pylons as an action On each request Pylons routes the HTTP information to a particular controller action based on the URL that was requested The action should return a response, which Pylons passes back to the server and on to the browser Let s see this in practice by creating a controller Once again you can use a paster command to help you get started quickly: $ paster controller hello This command creates a skeleton controllers/hellopy file for you as well as a helloworld/ tests/functional/test_hello.

Do you want to experiment with size policies and layouts Do it in Designer to receive visual feedback Tip

The form is given a name so that JavaScript code elsewhere in the HTML can refer to the components of the form, such as the text field qty, which contains the user-specified number of pizzas to order; and the submit button named Order, which the user can click to execute the order Second, an onKeyUp handler has been added to the qty text field The onKeyUp handler tells the browser to call the computePrice() JavaScript function whenever the user has made a change to the qty text field Third, the definition of the computePrice() JavaScript function has been included in the HTML using the <SCRIPT> tag The computePrice() function first updates the value of the hidden price field based on the quantity the user has selected, and then updates the order submit button to read Pay $X, where X is the computed price.

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