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If you need to create a completely new widget (something that does not act like any other widget), you have to subclass the QWidget class directly. This enables you to do anything, but that freedom also comes with responsibilities. All internal states have to be managed by you, as will all repainting and size hinting. Let s start by looking at what you re trying to do. The widget that you ll create is called CircleWidget and will listen to mouse events. When the mouse is pressed, a circle is created. As long as a mouse button is pressed within the circle, the circle grows. If the mouse is pressed while the pointer is kept outside the circle, the circle will shrink until it disappears, and a new circle will start to grow where the pointer was when the first circle disappeared (see Figure 7-27).

If the Add New Person button is clicked, the form is rerendered with its submitted values and an extra set of person fields No validation takes place at this stage, so the values redisplayed are the same as those entered If the user clicks one of the Remove Person buttons, the ID of the set of person fields to be removed is obtained from the button value, and that set of fields is manually removed from the dictionary of values that is used to repopulate the form when it is rendered If the action isn t recognized, it is assumed the user clicked the Save button The Study schema is used to validate and convert the data The NestedVariables prevalidator converts the flat HTML form data into a nested data structure Each of the fields in turn is then checked against its validator.

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To solve the problem discussed in the preceding section, we need to introduce a trusted third party called a certificate authority (CA) to verify people s identities. Specifically, the CA binds people s identities to their public keys. To accomplish this, a CA, for instance, authenticates Bob, and then digitally signs a statement called a public key certificate (or certificate, for short) saying that The public key for bob@learnsecurity.com is... (we cover digital signatures in 15). Certificates typically also specify an expiration date, such that the identity-topublic-key binding should not be trusted by default after the expiration date. A CA is also responsible for revoking keys and certificates. Sometimes, a user s private key is lost, compromised, or outright stolen prior to the expiration date in the certificate. In that

You have to track mouse events: button presses, button releases, and pointer movements. You also need to have a timer for growing and shrinking the circles over time. Finally, you have to take care of the repainting and give the Qt layout classes a size hint (all can be seen in the class declaration in Listing 7-13). Looking at the class declaration, you can group together the contents: The basic necessities: Here you find the constructor and sizeHint. Painting: The paintEvent method uses the variables x, y, r, and color for keeping track of what to draw. Mouse interaction: The mouse s events are caught using mousePressEvent, mouseMoveEvent, and mouseReleaseEvent. The last known mouse position is kept in mx and my. Timing: The QTimer object pointed to by timer is connected to the timeout slot. It updates x, y, r, and color depending on the mx and my values.

In the case of person, this means each of the sets of person fields is itself validated against the Person schema If there are no errors, the OneChiefInvestigator chained validator is run to ensure there is only one chief investigator If any of the validation checks fail, the form errors are encoded into a flat data structure using the variabledecodeencode() function so that each of the keys associated with the errors can be understood by htmlfillrender() and redisplayed next to the fields to which they refer Finally, if all the validation checks pass, the schemato_python() method returns the decoded, validated, and converted values ready for your program to handle the data in whichever way it sees fit Ordinarily, this would most likely be to save the data to a database before using hredirect_to() to redirect the user to a page confirming the data had been saved.

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