Is there a trick to getting "OnChange" type of functionality with a TListBox? I can subclass the component and add a property, etc then only carry out OnClick code if the Index changes... I can also hack it with a form level variable to store the current index but just wondering if I'm overlooking the obvious before I go one way or the other.
Delphi TListBox OnClick / OnChange?
12.3k Views Asked by Charles R. Thompson At
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There seems to be no way other than implementing this by yourself. What you need is to remember the currently selected item and whenever the
ItemIndex
property is changed from code or whenever the control receives theLBN_SELCHANGE
notification (which currently fires theOnClick
event), you will compare the item index you stored with item index which is currently selected and if they differ, fire your ownOnChange
event. In code of an interposed class it could be: