Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
Beide Seiten der vorigen Revision Vorhergehende Überarbeitung Nächste Überarbeitung | Vorhergehende Überarbeitung | ||
xojo:objectnotifier:start [2021/04/02 08:51] mz |
xojo:objectnotifier:start [2021/04/06 09:27] (aktuell) mz [Object notification] |
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- | ====== Object | + | ====== Object |
- | {{ : | + | <fs x-large>A simple subscribe-callback mechanism for inter-object communication</ |
<WRAP round download 40%> | <WRAP round download 40%> | ||
- | {{ : | + | **{{ : |
{{ : | {{ : | ||
</ | </ | ||
+ | |||
+ | |||
+ | This works similar to the built-in interfaces // | ||
+ | However the **ObjectChanged** method receives two parameters: an **Object** from the notifier and any **info** from the original subscriber.\\ | ||
+ | |||
+ | The **notifier** may send himself by setting " | ||
+ | The **subscriber** stores any sort of (static) information together with the callback-address when subscribing by // | ||
+ | This info may be a simple index number, but it can also be a whole object (means a reference to an object) so that the receiver can distinguish which subscription called him. | ||
+ | |||
+ | The **// | ||
+ | Simply instantiate this class and call their members like: | ||
+ | |||
+ | Declare: | ||
+ | private property onb as ObjectNotifierBox | ||
+ | in // | ||
+ | onb = new ObjectNotifierBox | ||
+ | Actual implementation of the // | ||
+ | Sub addObjectNotificationReceiver(receiver as objectNotificationReceiver, | ||
+ | | ||
+ | End Sub | ||
+ | |||
+ | Sub removeObjectNotificationReceiver(receiver As objectNotificationReceiver) | ||
+ | | ||
+ | End Sub | ||
+ | |||
+ | For calling all subscribed receivers write somewhere in your class: | ||
+ | |||
+ | onb.callReceivers(me) | ||
+ | |||
+ | Instead of " | ||
+ | |||
+ | <WRAP round important 100%> | ||
+ | Be careful with // | ||
+ | < | ||
+ | xy.addObjectNotificationReceiver(me, | ||
+ | xy.addObjectNotificationReceiver(me, | ||
+ | </ | ||
+ | Because // | ||
+ | It's therefore not possible to delete only the second entry (with //info// 2). | ||
+ | |||
+ | </ | ||
+ | |||
+ | |||
+ | |||
+ | ====== Sourcecode ====== | ||
+ | |||
+ | {{ : | ||
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Properties | Properties | ||
| | ||
- | mInfos() As Variant | + | |
- | mReceivers() As objectNotificationReceiver | + | |
| | ||
End Class | End Class |