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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.

<script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <dataSource id="dataSource" serviceURL="DataService.asmx" propertyChanged="onChange"/> <listView id="masterRepeater" targetElement="dataContents" itemTemplateParentElementId="masterTemplate" propertyChanged="onChange"> <bindings> <binding dataContext="dataSource" dataPath="data" property="data"/> </bindings> <layoutTemplate> <template layoutElement="masterTemplate"/> </layoutTemplate> <itemTemplate> <template layoutElement="masterItemTemplate"> <label targetElement="masterName"> <bindings> <binding dataPath="Name" property="text"/> </bindings> </label> <hyperLink targetElement="masterDescription"> <bindings> <binding dataPath="Description" property="text"/> </bindings> </hyperLink> </template> </itemTemplate> <emptyTemplate> <template layoutElement="masterNoDataTemplate"/> </emptyTemplate> </listView> <application> <load> <invokeMethod target="dataSource" method="select"/> </load> </application> </components> </page> </script>

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Widgets and layouts are the building blocks of all user interfaces. Make sure to take the time to learn how to use them. Designer is a great tool to help you become familiar with the available components. It enables you to try out widgets and practice building proper layouts. Remember to put all widgets in layouts and test your designs by resizing the dialog. By making sure that it always looks good, you ensure that it will work with different languages, screen resolutions, and font settings. The most important lessons from this chapter are the following: Always put dialog buttons in a QDialogButtonBox to ensure that they appear in the order that the user expects on all platforms. Make sure that all widgets are managed by a layout any stray widgets can make a dialog look bad on other platforms and on systems with different visual settings. When designing a dialog, make sure to always look at it from the user s viewpoint. Refer to Figure 3-33 and think about structure, visual aids, and the user s purpose when using the design. Do not be afraid to experiment with Designer. You can learn to build any design by using Designer and its preview capabilities.

A lot of this may not make much sense right now, but don t worry; as you work through this book and see how elegantly Atlas Script matches to the underlying HTML and empowers it with GUI logic, and you see how the server-side controls mesh neatly with this, it will soon become second nature This code first sets up a ScriptManager called MyManager to make sure the correct scripts and script libraries are downloaded to the client Next comes the HTML markup that defines the user interface, which is a simple list derived from the master template for the page Following this you ll see your first example of Atlas Script The first step this script takes is to set up the data source You do this with the <dataSource> tag like this: <dataSource id="dataSource" serviceURL="DataService.

The Suspend and Terminate activities are used most often in exception handling They provide a basis for exception handling with workflows by logging errors and either waiting for user intervention (Suspend activity) or just stopping the workflow altogether (Terminate activity)..

hus far in this book you have primarily used dialogs to communicate with your users. Yet although dialogs are a great solution when you need a widget for holding widgets and guiding the user in a particular task or configuring options surrounding a specific subject, most applications are not based around just one particular task, but a document. This is where a main window enters the picture. A main window is the top-level window around which an application is based. It can have a menu bar, toolbars, a status bar, and areas in which toolboxes and other supporting windows can be docked. It is possible to open the application s dialogs f

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