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A control flow case represents navigation between two points in a task flow. To create a control flow, simply click the control flow case in the Component Palette and then click on the source point in the task flow diagram. You can then set the end point for the navigation by positioning the arrow and clicking on a destination point on the task flow. You can also set the name of the control flow case, which would typically reflect the action that causes the navigation to happen; for example, the following flow control case is named edit.
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Once you have completed the preceding action, the control flow case properties From Activity ID, To Activity ID and From Outcome reflect the source, destination, and name of the control flow, respectively.
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Initiating a Control Flow Case So what triggers this control flow case This is covered in more detail in the next chapter, but for the moment, the short answer is that a group of UI components, such as buttons, menus, and links, has an Action property. For this property, JDeveloper shows the possible control flow cases that can be initiated from the page on which the component is placed. If the Action property is set on the button, then the framework will automatically navigate, as defined by the control flow case, when that button is clicked.
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One of the key reasons we talk about task flow and not page flow is that a task flow is not limited to the navigation of only pages, but can also include calls to methods as part of the application flow. So, why might that be useful Well, for example, when creating a new customer, you want to navigate to a new page to enter the customer details; however, you first want to call a method to create a new customer row. You can either drag and drop a method directly from the Data Controls panel or create a placeholder by dragging and dropping a method call activity onto the task flow from the Component Palette. You can then use control flows to wire up the flow, just as you do with a view activity.
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To associate a placeholder method call with an actual method, you can either drag and drop a method from the Data Controls panel onto the method call activity or explicitly set the binding using the Method property in the method call activity. For a method call activity, the property Activity ID is the name of the method call activity in the task flow, which can be different from the method being called. The property Fixed Outcome defines the name of the control flow to be followed after executing the method.
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Wildcard Control Flow rule
So far, you have seen how to define the flow between specific pages and methods within a task flow. However, what happens if you have a page that is navigable from any other page, for example, a product catalog or a logout page If you wanted to implement the navigation from every page, you would have to define a control flow from each view activity to the specified page. This would obviously make the task flow diagram much more complex. Instead, a feature of task flows, called a wildcard control flow rule, allows you to define that a task flow activity can be accessed from any task flow activity whose outcome matches a particular wildcard. For example, if the product catalog can be accessed only from any of the customer pages, then you would define a wildcard Customer*. To implement this behavior, drag and drop a wildcard control flow rule from the Component Palette onto the task flow diagram and drag a control flow between it and the page to which you want to navigate. Now set the From Activity ID of the wildcard control flow rule to Customer* to indicate that this control flow can be called from any view activity whose name, defined by Activity ID, starts with the string Customer.
NOTe If From Activity ID is set to * then the task flow activity is available from all pages in the task flow. This might be useful if you want to have a help or logout page that can be navigated to from any page in the task flow. Now when it comes to setting the Action property for a button on a page, the option gotoProducts will be available on any task flow activity whose name meets the wildcard rule.
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