问题
I have a UI with a Combo box. The list of items, which can be chosen, has to be refreshed every time the combo is about to open the list.
Is there any way - i.e. to add a listener which will inform UI that Combo is about to open?
Unfortunately I am not able to observe model to update the list when it changes.
回答1:
Unfortunatelly there is no such method for SWT Components. In Swing it would be easy with the help of the PopupMenuListener Interface.
A workaround I can think of would be to implement a MouseListener and a KeyboardListener (As Comboboxes can be opened by pressing 'space') so you can at least update your Combobox List when those two Events take place.
来源：https://stackoverflow.com/questions/7429895/how-to-update-the-list-of-items-in-the-swt-combo-box