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Figure 5-6. The custom delegate shows the value as a bar and edits the value using a custom editing widget: a slider. Let s look at the createEditor and updateEditorGeometry methods shown in Listing 5-14. The member for updating the geometry is pretty easy it just takes the rect given through option and sets the geometry of editor accordingly.

This chapter has covered several of the activities that provide flow within a workflow. These activities move the execution of the workflow from one step or activity to another, or execute multiple activities. The real-world example in this chapter showed how to add a Terminate activity to the Purchase Order workflow instead of a Code activity when conditions aren t met. The next chapter will cover rules-based workflow. The real-world example in the next chapter will show how to replace all the IfElse activities in the Purchase Order workflow with rulesbased activities instead.

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Listing 5-14. Creating the custom editing widget and resizing it QWidget *BarDelegate::createEditor( QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index ) const { QSlider *slider = new QSlider( parent ); slider->setAutoFillBackground( true ); slider->setOrientation( Qt::Horizontal ); slider->setRange( 0, 100 ); slider->installEventFilter( const_cast<BarDelegate*>(this) ); return slider; } void BarDelegate::updateEditorGeometry( QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index ) const { editor->setGeometry( option.rect ); }

binding_1.set_dataContext(checkBoxBoolean); binding_1.set_dataPath('checked'); binding_1.set_property('text'); binding_1.set_transformerArgument("Checkbox is {0}."); binding_1.set_direction(Web.BindingDirection.InOut); binding_1.transform.add(Web.Binding.Transformers.ToString); This is the same as how you set it up in the Atlas Script earlier, pointing the binding at the checkBoxBoolean control s checked property. This is then bound to the text property of this control. Note that the binding hasn t yet been associated with the text box, but this will happen shortly. The transformer argument is set up to create the text that will show in the text box after the binding occurs, as well as the direction type for the binding. The values for the binding direction are available in the Web.BindingDirection enumeration. Additionally, the transform Web.Binding.Transformers.ToString is applied. Other values for the transform are available in the Web.Binding.Transformers enumeration. To associate this binding with the text box, you need to call the get_bindings() method to get the collection of bindings associated with this control and call its add method, passing it this binding. You do that like this: textBox.get_bindings().add(binding_1); Another binding connects the checkboxes to each other. Again, this is a Web.Binding control, which supports methods that allow you to set the data context, data path, transform, and property to which to bind. You set it up like this: var binding_2 = new Web.Binding(); binding_2.set_dataContext(checkBoxBoolean); binding_2.set_dataPath('checked'); binding_2.set_property('checked'); binding_2.transform.add(Web.Binding.Transformers.Invert); checkBoxDisabled.get_bindings().add(binding_2); It is vitally important to then call the initialize() method on the controls after all the binding is set up to make sure it works correctly. Sometimes by habit you may initialize them directly after construction, but in this case you should wait until all of the bindings have been configured first: g_checkBoxBoolean.initialize(); g_checkBoxDisabled.initialize(); g_textBox.initialize();

QRect&) method to set the location and size of a widget might seem like a good idea, but layouts are the better choice in 99 percent of the cases. It is used here because the area showing the model item is known and has been determined directly or indirectly from a layout if layouts have been used.

The method for creating the editor contains slightly more code, but it is not complicated. First, a QSlider is set up to draw a background so that the model item s value is covered by the widget. Then the orientation and range is set before the delegate class is installed as an event filter. The event-filtering functionality is included in the base class QAbstractItemDelegate.

rules-based workflow is a workflow made up of activities that have rules associated with them. These rules are essentially If-Else statements with a condition and action. A rules-based workflow is a good way to model actual business processes, as business processes have business rules associated with them. You can use rules to define criteria that must be met for an activity to take place. This chapter will show you how to use the Policy activity to create a rulesbased workflow.

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