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graphical WYSWIG tool and then add the interactivity to it using F#. Mobiform offers a designer called Aurora (http://www.mobiform.com/eng/aurora.html), and Microsoft offers a designer called Expression Blend (http://www.microsoft.com/products/expression/en/expression-blend/default.mspx).

Livingston: What do you think makes a good hacker Spolsky: I think what makes a good hack is the observation that you can do

Because regular expressions are very useful for verifying that a given string has the correct format, it is natural that Qt has a validator based on it. The QRegExpValidator takes a QRegExp as a constructor argument and uses the RE to validate input. Listing 3-25 shows how this looks in real code. The dialog class containing the line editor, button, and label has been stolen and adapted from the listing showing the validators for numbers. The thing to notice is that the regular expression is treated as if it starts with a ^ and ends with a $, so they are left out.

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without something that everybody else thinks you need. To me, the most elegant hack is when somebody says, These 2,000 lines of code end up doing the same thing as those 2 lines of code would do. I know it seems complicated, but arithmetically it s really the same. When someone cuts through a lot of crap and says, You know, it doesn t really matter.

For example, Ruby on Rails is a framework that you can use with the Ruby programming language to access databases It is the first framework that you can use from any programming language for accessing databases to realize that it s OK to require that the names of the columns in the database have a specific format Everybody else thought, You need to be allowed to use whatever name you want in the database and whatever name you want in the application Therefore you have to create all this code to map between the name in the database and the name in the application Ruby on Rails finally said, It s no big deal if you re just forced to use the same name in both places You know, it doesn t really matter And suddenly it becomes much simpler and much cleaner.

Listing 3-25. Using a regular expression for validating user input class ValidationDialog : public QDialog { public: ValidationDialog() { QGridLayout *layout = new QGridLayout( this ); QLineEdit *reEdit = new QLineEdit( "+46(0)31-445566" ); QPushButton *button = new QPushButton( "Close" ); layout->addWidget( new QLabel("Phone:"), 0, 0 ); layout->addWidget( reEdit, 0, 1 ); layout->addWidget( button, 1, 0, 1, 2 ); ... connect( button, SIGNAL(clicked()), this, SLOT(accept()) ); } }; When the user inputs data, the QRegExpValidator enables all text to be removed from the right. This means that the user must add the plus, the parentheses, and the dash. This is not always clear and can cause confusion. When entering valid text, the validator does not obstruct any input, but when editing in the middle of the text there can be a problem. For example, it is impossible to remove the entire country code as soon as the left parenthesis has been added because there must be at least one digit there, according to the RE. When the user has completed entering data, it is important to match the string to an RE before accepting the data because the validator does not ensure that the string is complete. It is recommended that you use the cap method to get the actual data from the input string. Remember that you can use cap(0) to get the entire matched string. Compare this with the QDoubleValidator, where it is important to user QString::toDouble and check the result, even if the string has been monitored by a validator. See Figure 3-34.

The first example you ll look at is how to create a simple form in XAML and then display it to the user using F#. Listing 8-5 shows the XAML definition of a form with four controls: two labels, a textbox, and a button.

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