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What way is best to implement Callback for GotFocus/LostFocus? [message #11006]

Mon, 13 August 2007 22:48

jlfranks
Messages: 57
Registered: May 2007
Location: Houston, TX, USA

Member

We are solving the problem of editing a control in a touchschreen application.

For example, when EditString gets focus, we want to show a keyboard and be able to press buttons in order to modify the content of the control.

The first issue is generalizing the solution so that we can apply this to multiple EditString controls, or even EditDouble, EditInt.

One way is to derive from EditString and over-ride GotFocus() and LostFocus (), along with supporting API to set the callbacks for each.

A different approach is to hook the mouse event, check for the control of interest and with additional API and call the appropriate callbacks for various events/controls.

Which way is more desirable from a design viewpoint? Or, is there
another approach different from these?

--jlf

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