Classes and Properties in Visual Basic .NET

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Classes and Properties
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From the elaborated use-cases above, we can identify a number of potential classes and properties of them
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Picture: an obvious class, this should contain the catalogue details for a picture le Picture le: this is the data that a Picture object must store to keep track of a picture on the system s hard disk As a le-name and location can be stored in a simple string, this will be a property of the Picture class
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Title, category name, description: like Picture le, these are properties of the Picture class Catalogue: this is the overall program, but could also refer to the overall collection of pictures, in which case it is a collection of Picture objects We can use a Dictionary class to allow pictures to be listed by Title or some other attribute Reference to the picture: a synonym for Picture le Displayed list of pictures: we will need to provide a method for the user to identify a picture in the catalogue A list of titles may suf ce Since NET is well equipped with methods of displaying lists of information, this class is likely to turn out to be one of the built-in list mechanisms Picture details: this is simply a collective name for the individual properties already identi ed for a Picture
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Although not mentioned in any of the use-cases, a rudimentary knowledge of digital imaging tells us that each digital photograph has a date and time stamp that indicates when the picture was taken We can incorporate this information into the Picture class and this may allow us to do sophisticated searches or ltering of the catalogue list From this information, we can create a class diagram for the system (see Figure A112)
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Figure A112
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A class diagram showing properties and methods
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Operations and Methods
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To add more detail to the class diagram, we need to consider the operations required by the program, and decide which class should be responsible for them The Picture class We need to be able to create a Picture, add information to it, display it, save the data to le (not the picture, since this will already be stored in a le in some location of the system s hard disk) and load the data back from le In creating a picture, we will need to locate the actual image le and store its name and path within the object The user will need to add Title, Category and Description, but the TimeStamp member can be determined from the date and time on the Picture le The Catalogue class The Catalogue will require methods to add a picture, remove a picture, retrieve a Picture object from the collection (by Title), and load and save the whole collection
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11 n Files, Streams and Serialization
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Figure A113
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The class diagram with methods
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File formats There are several formats we could use in this application, but XML is likely to be a good choice since it is human readable, and exible enough that if our application outgrows serialized le storage, we will be able to import the data into a database From this information we can create the more detailed class diagram shown in Figure A113
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The User-Interface
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It would be as well to have some notion of how the user will interact with the catalogue when it is up and running A simple drawing of a suitable user-interface (Figure A114) can get us started by becoming the basis for the prototype of the real one
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Figure A114
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The main application form
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The simple drawing of the main form indicates key features of how the user will interact with the program Selecting a picture from the list on the left will make that picture appear in the preview panel on the form The various buttons will allow us to Add new pictures, Delete existing ones, display the current one Full Size (or as large as the PC screen can accommodate) and Edit the various descriptive elds associated with a picture From the class diagrams, we can also see how these will interact with the objectmodel For example, the Add button will need to initiate two consecutive operations, one from the Picture class and the other from the Catalogue: create a Picture (which will involve nding a picture le-name and adding other information) and add it to the Catalogue The Delete button will remove a picture reference from the Catalogue, etc
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