A custom view is a view which can be accessed like any other view, using
row and property operations, but which is fully managed by a customized
"viewer" class. The viewer will eventually handle all requests for the
view, such as defining its structure and size, as well as providing the
actual data values when requested.
Custom views are read-only in this version, and cannot propagate changes.
To implement a custom view, you must derive your viewer from this base
class and define each of the virtual members. Then create a new object
of this type on the heap and pass it to the c4_View constructor. Your
viewer will automatically be destroyed when the last reference to its
view goes away. See the DBF2MK sample code for an example of a viewer.
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virtual bool
GetItem (int row_, int col_, c4_Bytes& buf_);
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Fetch one data item, return it as a generic data value
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virtual int
GetSize ();
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Return the number of rows in this view
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virtual c4_View
GetTemplate ();
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Return the structure of this view (initialization, called once)
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c4_CustomViewer ();
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Constructor, must be overriden in derived class
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virtual
~c4_CustomViewer ();
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Destructor
class
c4_CustomViewer