Processing the Application-Defined Messages
In the example in Creating a Combo-box Toolbar
, SubClassProc sends application-defined messages to the toolbar window when
the user presses the TAB, ESC, or ENTER key in a combo box. The WM_TAB message is sent for the TAB key, the WM_ESC message for the ESC key, and the WM_ENTER message for the ENTER key.
The example processes the WM_TAB message by setting the focus to the next
combo box in the toolbar. It processes the WM_ESC message by setting the focus to
the main application window.
In response to the WM_ENTER message, the example ensures that the current
selection for the combo box is valid and then sets the focus to the main
application window. If the combo box contains no current selection, the example uses the CB_FINDSTRINGEXACT
message to search for a list item that matches the contents of the selection
field. If there is a match, the example sets the current selection; otherwise,
it adds a new list item.
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