Using the Container Callback

When an object is drawn in a container a series of states occur during the process of drawing that object. The state may be the beginning of the drawing process, a continuation of the drawing process, the ending of the drawing process, or the aborting of the drawing process. The following are the states currently supported for processing:

Drawing an object within a container generates calls to the LContainer::ContainerCallBack function. When the callback function receives a CONTAINER_EVENT_TYPE_DRAW event, information concerning the object being processed is also sent to the callback function in the pEventData parameter. This information includes the current state of the drawing.

Before LContainer::ContainerCallBack can be used, it must be enabled using the LContainer::EnableContainerCallBack function.

Help Version 22.0.2021.8.20
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LEADTOOLS Container and Automation C++ Class Library Help
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