Callback functions to handle events for a specific system build block

[Farshid]

I have two questions about customized event handling in Systembuild:

1- The SystemBuild Utility "sysbldEvent" can bo used to specify additional actions for the "openblock" and "navigate" events. However, it will be applied to all systembuild blocks.

Is there a way to limit its scope to a specific block or block type?

This has been done for the Altia block (which is a customized UCB block) - a double-click will open a special dialog box. Is this feature implemented using publicly available systembuild features or there are other special features used?

2- Is there any way to assign callbacks to other type of block events: copy, paste, etc ...

Thanks.

[Carl L.]

Farshid,
There are a couple of options for creating custom dialogs/blocks.

SysbldEvent can be used. As you noted it will generate and event for all the blocks. You can not generate an event only for a specific block. However the Xmath function has two values sent to it. One is the type of event (blockopen or navigate) and the blockId. You can use blockId together with SBA commands to find out which block generated the event. If it is a block that you are not interested in then return 0 and SystemBuild opens the normal dialog. If it is the right block then you can open your own dialog or perform what ever action is needed. Finally return a 0 if you want SystemBuild to still open the normal dialog, or you can return 1 and no dialog is opened.

The Altia
block is a custom block. It is a standard UserCode block that has been customized to have differnt default parameters and different icon. In the SystemBuild editor (not catalog browser) select a block and the go to Edit>New Custom Block. The custom block can a have a MathScript function associated with it that gets called when the block is created. For more information on custom blocks see chapter 18 of the SystemBuild Users Guide (Help>Search MATRIXx Bookshelf from Xmath).

The final method is creating a component. For a component percent vars can remain internal or they can be available to the user. You can also provide a different set of parameters that are available to the user, and then provide equations for how they map to the internal percent vars. Information on Components is in Chapter 17 of the SystemBuild User's Guide.

Carl L
National Instruments