Method XbpActiveXControl():subscribeStdEvents() Foundation
Registers event processing for standard ActiveX control events.
:subscribeStdEvents() --> self
This method always returns NIL.
:subscribeStdEvents() is called automatically during creation of an ActiveX control. The method has the PROTECTED attribute and can only be accessed from within derived classes. It cannot be called directly by Xbase++ applications.
The method :subscribeStdEvents() registers event processing for standard ActiveX control events. The event processor installed by :subscribeStdEvents() ensures that the application is notified about standard actions, such as mouse button clicks or key presses, using the normal event handling protocol defined for Xbase Parts.
Internally, :subscribeStdEvents() uses functionality provided by its base class ActiveXObject to install an event handler for the events defined in the control's default event set. This enables an Xbase++ application to react to the standard events defined by a control after the control was created. See method ActiveXObject:COMDefaultHandler()for further information on COM events and event management.
The following table lists the standard ActiveX events supported by :subscribeStdEvents(), along with their corresponding callback methods. The dispatch IDs of the events listed below are defined in the file ACTIVEX.CH.
|Event Name||Dispatch ID||Callback Method||Description|
|MouseDown||DISPID_MOUSEDOWN||:mouseDown()||Mouse button was depressed|
|MouseUp||DISPID_MOUSEUP||:mouseUp()||Mouse button was released|
|MouseMove||DISPID_MOUSEMOVE||:mouseMove()||Mouse was moved over the control|
|Click||DISPID_CLICK||:click()||Mouse button was clicked|
|DblClick||DISPID_DBLCLICK||:dblClick()||A double-click was performed|
|KeyDown||DISPID_KEYDOWN||:keyDown()||Key was depressed on the keyboard|
|KeyUp||DISPID_KEYUP||:keyUp()||Key was released on the keyboard|
If one of the standard events supported by the XbpActiveXControl class is not defined in the control's default event set, :subscribeStdEvents() uses the ActiveX control's type library information to check if the event is exposed by another interface defined by the control class. If so, :subscribeStdEvents() also installs an event handler for the respective event interface(s).
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