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Practical IDL Programming by Liam E. Gumley

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C Widget Event Structures

The event structures returned by the fundamental widgets in IDL are described in this appendix. Each event structure contains the fields ID, TOP, and HANDLER, as described in Chapter 9. This appendix defines the meaning of the widget-specific fields in each event structure.

It is possible for a given widget to generate more than one type of event. For example, base widgets can generate resize, kill request, and keyboard focus events. One way to distinguish between different event types is to examine the name of the event structure:

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For example, the event structure generated by a base widget as a result of a resize ...

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