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2 DESIGNING SOFTWARE
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Sample data entry form for the conceptual design of the Purchase Tracker
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The result of the conceptual user interface design is a layout of the basic form types (data entry form, summary form, search form, and so on) This includes a description of the common elements on the form and how they behave This conceptual design is the basis for designing the individual forms of the application To validate the conceptual user interface design, build a realistic example of each of the basic form types, either with a design tool or with Visual Studio Limit this to one form for each of the form types Present these examples to the users for their review Reuse this conceptual user interface design in the design of the other units of work for the application to ensure a consistent look and feel between all parts of the application
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Defining the Navigation Techniques
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A single application is composed of many forms, and the user needs a way to navigate to those forms You need to de ne a standard set of navigation techniques so that the users can easily nd the forms that they need to perform a particular task The most common navigational technique in Windows is a menu A menu lists key features or tasks When the user clicks the feature or task, a drop-down menu appears, allowing the user to select the speci c task to perform Another common technique is to use a list or tree that provides a set of options or tasks The user then picks a task from the list to open the appropriate forms to complete the selected task Regardless of the mechanism used to display options (menu, list, tree), be sure to name the features based on the tasks that the user performs, not on the computer s tasks For example, Receive Goods is a better option name than Create Inventory Transactions When de ning the application s navigational requirements, be sure to think about both the relative importance of each task and how often it is used For example, a task that is performed frequently should have a toolbar button or hot key to quickly bring up the form required to complete the task Dangerous tasks, such as a delete all feature, should be somewhat harder to get to and should include con rmation of the operation De ning standards for how the user navigates between the forms in your application makes your application easier to learn and use For more details on Windows Forms navigation techniques, see 4, Building the User Interface Layer
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After you have de ned the standard conceptual design and navigation techniques, you are ready to design the layout for each of the forms in the application (or unit of work) The layout de nes the placement of the visual elements on each form, along with how they behave The visual layout of each form is important at this point in the design process to ensure that the users understand what the application will do The visual layouts help the users picture the scenarios They also help the users de ne whatever other tasks, steps, or data they may have missed during the prior design phase
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Here are several guidelines to help you de ne the visual form layouts:
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Lay out for maximum productivity The layout should optimize the user s productivity when completing the tasks de ned in the scenarios It is often tempting when using object-oriented techniques to de ne the user interface as one form per object It is much better to design the forms based on the scenarios the steps required to perform a task even if that means pulling in information and processing from many different objects For example, the form that displays purchase information such as date and quantity is much more useful if it includes details on the customer and the product that was purchased Be consistent The forms should provide a consistent look and feel as de ned in the conceptual design For example, if one data entry form uses a button called Save and another uses a button called Submit for the same purpose, the user may be confused Put the most important elements rst The parts of the form the user interacts with the most should be readily available and at the beginning of the tab order This helps the user quickly nd what is needed and ignore what is less critical Visually group content If a form contains many data entry elements, it is easier for the user to nd the desired element if they are grouped logically on the form
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