Abstracting ID on message map based on class hierarchy

Question

I have a hierarchy of classes one base B, several derived D from B.

There is a protected member m_treeID, which is the ID of each tree inside.

I want at the base class to fill the message map like

ON_NOTIFY(NM_CLICK, m_treeID, OnNMClickTree)

instead of going for each D to do

ON_NOTIFY(NM_CLICK, TREE_A, OnNMClickTree)
ON_NOTIFY(NM_CLICK, TREE_B, OnNMClickTree)

... and so on.

Is it possible?

Answer 1

If I understand you right, have you looked at using ON_NOTIFY_RANGE?

If you need to process the same WM_NOTIFY message for a set of controls, you can use ON_NOTIFY_RANGE rather than ON_NOTIFY. For instance, you may have a set of buttons for which you want to perform the same action for a certain notification message.

When you use ON_NOTIFY_RANGE, you specify a contiguous range of child identifiers for which to handle the notification message by specifying the beginning and ending child identifiers of the range.

ClassWizard does not handle ON_NOTIFY_RANGE; to use it, you need to edit your message map yourself.

It explains how to use it in the article. As long as TREE_A, TREE_B etc. are sequentially numbered then you can have one message handler for all of them.