<html><head><base target=k-main></head><body bgcolor=white> <font face=Times size=3> 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. <P> Custom views are read-only in this version, and cannot propagate changes. <P> 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 <A HREF="c4_View.html" >c4_View</A> 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. <P> <hr size=1> <dl> <if !private> <a name="c4_CustomViewer_GetItem_intintc4_Bytes___"><dt> <nobr> virtual bool <b>GetItem</b> (int row_, int col_, <A HREF="c4_Bytes.html" >c4_Bytes</A>& buf_); </nobr> <dd> <font face=Helvetica size=-1>Fetch one data item, return it as a generic data value</font> <p> <if !private> <a name="c4_CustomViewer_GetSize___"><dt> <nobr> virtual int <b>GetSize</b> (); </nobr> <dd> <font face=Helvetica size=-1>Return the number of rows in this view</font> <p> <if !private> <a name="c4_CustomViewer_GetTemplate___"><dt> <nobr> virtual <A HREF="c4_View.html" >c4_View</A> <b>GetTemplate</b> (); </nobr> <dd> <font face=Helvetica size=-1>Return the structure of this view (initialization, called once)</font> <p> <if !private> <a name="c4_CustomViewer_c4_CustomViewer__"><dt> <nobr> <b>c4_CustomViewer</b> (); </nobr> <dd> <font face=Helvetica size=-1>Constructor, must be overriden in derived class</font> <p> <if !private> <a name="c4_CustomViewer__c4_CustomViewer___"><dt> <nobr> virtual <b>~c4_CustomViewer</b> (); </nobr> <dd> <font face=Helvetica size=-1>Destructor</font> <p> </dl> <hr size=1 width=50 align=left> class <b>c4_CustomViewer</b> </font> </body></html>
