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<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>
|
