You are here: NI Home > Support > Product Reference > Manuals > LabWindows/CVI 8.5 Help

Object Types: Trees.

Description: Expand events are sent to the callback function associated with the tree control when the user expands a tree item. To expand items, users can click the plus sign next to the tree item, press the right arrow, and right-click and select Expand Subtree or Expand All.

This event is swallowable. Return 1 to swallow EVENT_EXPAND.

Event Data Parameters:

Right-clicking and selecting Expand All:

eventData1 = VAL_ALL

eventData2 = 0

Right-clicking and selecting Expand Subtree:

eventData1 = VAL_DESCENDENT

eventData2 = itemIndex

Clicking the plus sign or pressing the right arrow:

eventData1 = 0

eventData2 = itemIndex