TreeViewExpandingEvent Class

Provide information about a tree view expanding event, which is generated when an item in a tree view is about to be expanded or collapsed, exposing or hiding its children.

Inheritance Hierarchy

Object
  Event
    ControlEvent
      ControlNotifyEvent
        TreeViewExpandingEvent

Namespace: VO
Assembly: VOGUIClasses (in VOGUIClasses.dll) Version: 2.21

Syntax

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 CLASS TreeViewExpandingEvent INHERIT ControlNotifyEvent

public class TreeViewExpandingEvent : ControlNotifyEvent

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The TreeViewExpandingEvent type exposes the following members.

Constructors

	Name	Description
	TreeViewExpandingEvent	Initializes a new instance of the TreeViewExpandingEvent class

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Properties

	Name	Description
	Control	The Control object that generated this event. (Inherited from ControlNotifyEvent.)
	ControlID	A number between 1 and 8000 representing the unique ID of the control that generated this control event. (Inherited from ControlEvent.)
	Description	A string representing the description of the control that generated this control event. (Inherited from ControlEvent.)
	Handle	The pointer to the window where the event occurred (Inherited from Event.)
	HelpContext	A string representing the help context ID of the control that generated this control event. (Inherited from ControlEvent.)
	HyperLabel	The hyperlabel connected to the control event. (Inherited from ControlEvent.)
	Message	A dword representing the Windows API message associated with the given event. (Inherited from Event.)
	Name	A string representing the name of the control that generated the event. (Inherited from ControlEvent.)
	NameSym	A symbol representing the name of the control that generated the event. (Inherited from ControlEvent.)
	NotifyCode	The notification code for this event as defined by the Windows API. (Inherited from ControlNotifyEvent.)
	TreeViewItem	The TreeViewItem object which is being modified.
	Window	An object indicating the window or control in which the event occurred. This is helpful, for example, for distinguishing between similar menu events coming from the same context menu attached to different controls. (Inherited from Event.)

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Fields

	Name	Description
	hWnd	(Inherited from Event.)
	lParam	(Inherited from Event.)
	oWindow	(Inherited from Event.)
	uMsg	(Inherited from Event.)
	wParam	(Inherited from Event.)

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Remarks

The tree view control generates this event whenever one of its items is about to be expanded or collapsed. Information packaged in the event object includes which item is affected. The primary difference between this object and the TreeViewExpandedEvent is that this event is generated before the expand/collapse action occurs.

Reference

VO Namespace