Events to reduce tree

Hello

I don't understand how the EVENT_COLLAPSE and EVENT_EXPAND work on a tree control.

By using the following code

case EVENT_EXPAND:
GetTreeItemAttribute (FL_TreeListPanel, TREE_LIST_LIST, eventData2, ATTR_COLLAPSED, & FL_ItemCollapsed);
break;

FL_ItemCollapsed is equal to 1. I expect 0 because a click on the + develops the tree.

In fact, I want to adjust the height of the control the number of exposed elements.

I have noticed that with

GetTreeItemAttribute (FL_TreeListPanel, TREE_LIST_LIST, ItemIndex, ATTR_COLLAPSED & FL_ItemCollapsed);

FL_ItemCollapsed is equal to 0, only after the callback function is complete. So I was wondering how I could handle this situation in the callback function.

Best regards

As indicated in the help, EVENT_EXPAND and EVENT_COLLAPSE are swallovable events: This means that you receive before their effect is realized, so that you can swallow them (abandoning them, do as if they did not have). One possible solution to this problem is PostDeferredCall a function while it is executed after the expand/collapse event ended.

You can search the treeevent example on your computer: it is an example of PostDeferredCall associated with the EVENT_EDIT_MODE_STATE_CHANGE event.

Tags: NI Software

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