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Figure 2-27. A Qt project is built from sources, generated meta-objects, and user interface descriptions. In Qt applications, all dialogs inherit from the QDialog class. The code generated by the uic does not inherit that class; in fact, it does not even inherit from QObject. The conclusion is that you must create a class based on QDialog. Let s start by having a look at the list dialog. Listing 2-2 shows the header file for the list dialog. A class called ListDialog is created that inherits QDialog. The class has slots, so the Q_OBJECT macro must be there. Then, at the very end, the Ui::ListDialog class is used to create the private member variable ui. Listing 2-2. The header file for the ListDialog class #ifndef LISTDIALOG_H #define LISTDIALOG_H #include <QDialog> #include "ui_listdialog.h" class ListDialog : public QDialog { Q_OBJECT public: ListDialog();

Returns an array of strings indicating the data bindings for this control. Gets the data context for the binding associated with the control. Returns the ID for the control. Allows the access key for quick access to this control to be set or read. Returns an object reference to the associated element. Returns an array of strings indicating the behaviors associated with this control. Gets or sets the cssClass for this control. You can also use the various CSS methods of the control to manipulate its CSS class. Gets or sets whether the control is enabled. When true, the control is enabled; when false, the control is grayed out. Returns an object containing the element s style settings. Gets or sets the value of the control in the tab index. Gets or sets the visibility of the control. If true, the control is visible; if false, it is invisible. Returns a string containing the CSS definition for the object s visibility. InputControls can have validators that automatically validate the data that is being input against programmed criteria such as a number range, a number format, or specific text.

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private slots: void addItem(); void editItem(); void deleteItem(); private: Ui::ListDialog ui; }; #endif // LISTDIALOG_H The ui object consists of a set of pointers to all widgets and layouts that make up the dialog. It also contains two functions: setupUi (for populating a QDialog with the widgets and layouts), and retranslateUi (for internationalizing applications covered in more detail in 10). The implementation of the ListDialog constructor shows how the ui object is used (see Listing 2-3). First, setupUi is called to create the UI of the dialog. When calling the setupUi, the connections made in Designer are set up. The rest of the connections are done manually by calling connect. In the calls, the ui object is used to access the widgets in the dialog. No connections really have to be made manually. By implementing a slot named on_addButton_clicked(), the setupUi call automatically connects the clicked signal from the addButton to that slot. This works for all slots named using the scheme on_widget name_signal name( signal arguments ). Even as this is possible, I recommend not using it because it does not encourage providing clear names for slots that reflect what they do. Also, when connecting several signals result in the same action, this approach fails. You end up having several slots calling the same function or even worse containing the same code. Making all connections in the constructor of the dialog classes ensures that the code will be easy to follow and read you just created a table of how the user interface is connected to the slots performing the actual work. Listing 2-3. Constructor of the ListDialog class ListDialog::ListDialog() : QDialog() { ui.setupUi( this ); connect( ui.addButton, SIGNAL(clicked()), this, SLOT(addItem()) ); connect( ui.editButton, SIGNAL(clicked()), this, SLOT(editItem()) ); connect( ui.deleteButton, SIGNAL(clicked()), this, SLOT(deleteItem()) ); }

Create a new VB State Machine Workflow Console Application called VBWhileStateMachineExample View the code and create a private integer variable called IntCounter and initialize it to 0: Private IntCounter As Integer = 0 Also, add the WhileCondition sub with the same code as the Sequential workflow example: Public Sub WhileCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) eResult = IntCounter < 10 IntCounter = IntCounter + 1 End Sub Name the default state CompletedState and set it as the CompletedState Add a new State activity with a name of FirstState Add a StateInitialization activity to the FirstState activity Within the StateInitialization activity, add a While activity with a Condition property pointing to the WhileCondition sub that was created earlier Within the While activity, add a Code activity and leave the default name.

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