vb.net free barcode dll Converting an existing UI Component in Java

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Converting an existing UI Component
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You may find that your page contains a UI component that, on reflection, you think would better be represented by a different UI component. Rather than deleting that UI component and then replacing it with a different component and having to rebind the new component, JDeveloper allows you to convert from one type of UI component to another.
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In the JSF visual editor, right-click the field showing credit limit and select Convert To. The Convert Input Text dialog appears and you can choose a different UI component, such as Input Number Spinbox. JDeveloper automatically maps the common properties between the old and the new component, such as Label and Value, so that you don t have to manually rebind the component. JDeveloper will flag any UI component properties that do not map to the new component.
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Binding a UI Component
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The final option covered here is that you can drag a component from the Component Palette and drop it on the page. Then manually reference either a new or existing binding from the appropriate property of the component. This technique requires more experience with creating bindings, component properties, and EL. However, there is one helper feature within JDeveloper that was touched on earlier. For a selected UI component, the Property Inspector includes a button Bind to ADF Control.
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Bind to ADF Control
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Clicking this button presents a dialog that allows you to select a data control. JDeveloper will then create the appropriate binding and reference that binding from the component properties. Note, however, that this feature is not available for all UI components.
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Master Detail Layout
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Your business service includes not only data collections, but also definitions of relationships between those data collections. This means that, for example, you can display the order items for a specific order. This master detail relationship is represented in the Data Controls panel as a hierarchy.
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Building Typical ADF Faces Pages
Orders for a specific customer
Orders items for a specific order
When you drag the detail node from the Data Controls panel onto a JSF page, JDeveloper recognizes this relationship and creates an appropriate page layout.
Creating a Master Detail page
Assume that you have created a page containing a tabbed panel displaying a table of customers and you now want to show the orders and order items for that customer. Furthermore, you want to be able to navigate through each of the customer s orders. To create a master detail layout, drag the child data collection in this case OrderItemsView1 from the Data Controls panel onto the page. JDeveloper recognizes that this data collection is a detail for a master data collection and thus includes the menu option Master-Detail. In this case, select ADF Master Form, Detail Table.
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JDeveloper arranges the master data collection as a read-only form using a Panel Form Layout, and the detail data collection appears as a read-only table. If you wish, you can now fine-tune the UI components using the techniques described earlier in this chapter.
When you are ready, you can run the page and check the order items for a selected customer s order. If you run and test this page, you might notice that the order items detail table doesn t stretch to fit its parent container. To get the table to stretch automatically, set the table property StyleClass to AFStretchWidth and optionally set ColumnStretching to last. At this point you probably don t need to know much more than the fact that this is a useful feature for automatically enabling tables to stretch to fill horizontal space. NOTe In case you are curious, a feature called partial page rendering is helping your page achieve this master details coordination. When you navigate rows in the master form, the master UI components, or more correctly the binding executable used by the master UI components informs the detail table that it needs to refresh. It is called partial page rendering because only these two groupings of components are talking to each other and so the rest of the page does not need to be re-rendered. A property on the binding executable called ChangeEventPolicy has been automatically set to ppr to inform the framework to implement this behavior. Partial page rendering is covered in more detail in 15.
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