crystal reports 2013 qr code FUNCTIONAL ROLES in Font

Generation QR Code ISO/IEC18004 in Font FUNCTIONAL ROLES

CHAPTER 10 FUNCTIONAL ROLES
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Worker Examples
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Let s take a look at some interesting scenarios in which you might use workers. The first example shows how you can use a worker to implement user-interface elements. What is most significant about this example is what the Worker doesn t do, using a Coordinator to handle certain kinds of things. The second example shows how a composite Worker might manage concurrent subordinate workers, using an internal Coordinator to manage concurrency issues.
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User-Interface Elements As Workers
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When implementing user interfaces as workers, first answer this question: What business rules should the Worker implement UI elements have two main tasks: To render data To capture user actions You can partially accomplish the first task using a visual designer to lay out UI controls in a design environment. For screen-oriented interfaces, place the controls on a form, dialog, or window element. For printer-oriented interfaces, you often place the controls on a report element, which handles printer layout details at run time. A visual designer allows you to lay out the UI controls in a way that satisfies the business requirements. The requirements might be simply The screen needs to look like so and so . . . or The screen must allow the end user to do this and this . . . More in-depth requirements would spell out the exact appearance and behavior of each control. The second task is to capture user actions. The Worker should handle actions that require simple cosmetic changes to the interface, such as showing or hiding something. Actions that require the fetching of new data should generally be handled by firing events that are handled by a Coordinator. Once you bring a Coordinator into the picture, you need to be clear about who handles what. The division of labor between the Coordinator and Worker is straightforward: The Coordinator is in charge of what to display in other words, fetching the data while the Worker decides how to display it, which includes laying controls out on the UI and formatting data for presentation. As a practical example, consider a simple UI that might be used in a real-estate search program, allowing people to search for a home. The system must let users search for different types of properties in a number of cities. Assume the system has a search form that looks like Figure 10-3 at design time. The business requires that the UI allow a user to choose between renting and buying. The user then enters a price, a city, and a state and then runs a search that returns a list of properties. The UI Worker might be implemented using a single class, consisting of a form with embedded UI controls. The Payment Model group box displays two panels, shown with dashed borders. At run time, only one of these panels will be visible, based on the radio button selected. The middle group box displays two drop-down lists that show the states and cities supported by the real-estate system. The bottom group box contains a list of properties found after the user clicks the Search button. Let s see how the nonvisual part of the system is handled. When the user clicks either the Rent or Buy radio button, the only action required is to show or hide panels. This action doesn t require retrieving any new data, so the Worker can handle it directly. When the search form is first displayed, it must contain a list of states and cities. The retrieval of the lists is not a data-presentation problem, so you should delegate it to another object. In this example, you can use a Coordinator to obtain the lists, which will be string arrays. The Coordinator gives the state list to the Worker, who then puts the states in the appropriate drop-down list and selects an initial state. The Worker then needs to get a list of cities for the selected state. The Worker fires an event to the Coordinator, specifying which state is currently selected. The Coordinator then retrieves the city list and gives it to the Worker, as before.
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