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Drag Group

(Since HALion 7.0)

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Description
Properties
Drag Group Callbacks

Description

The Drag Group control allows you to implement drag operations. You can drag a simple text information or excecute more complex script functions. As a drop target you can use either the Drop control, or an external target. The graphical representation of the dragged object includes a snapshot of all controls that exists inside the Drag Group.

Properties

Poperty	Description
Name	The name of the element. This name will be displayed in the GUI Tree.
Scope	Allows you to define which part of the Program Tree is affected by the controls inside the Group.
Drag Info	The Drag Info can be used as follows: It can be a string that will be send to the target. It can be a UI variable that will be read at drag time. It can also be modified at drag time by the script callback onDropGetInfo by returning another string.
Position/Size	Position X, Position Y, Width, Height: Position and size of the element in pixels. Position X/Y defines the position of the upper left corner.
Attach	Defines how an element behaves when its parent element is resized. You can set the following parameters: Left: If the parent element is resized, the element remains attached to left edge, with the specified ratio. Right: If the parent element is resized, the element moves relatively to the right edge, with the specified ratio. Top: If the parent element is resized, the element remains attached to top edge, with the specified ratio. Bottom: If the parent element is resized, the element moves relatively to the bottom edge, with the specified ratio. Left + Right: If the parent element is resized, the element is resized horizontally relatively to the left and right edges, with the specified ratio.
Tooltip	Text that appears as a tooltip when the mouse hovers over the element.

Drag Group Callbacks

onDropGetInfo

onDropGetInfo(viewname, draginfo)

Description

Callback for the source of the drag operation when the operation starts. The text in draginfo is taken from the Drag Info property of the control.

Arguments

Argument	Description	Value Type
viewname	The name of the dragging view.	string
draginfo	The text specified by the Drag Info property.	string

Return Values

The function can return a table with the following keys:

Return Value	Description	Value Type
copy	Set this to `true` if copying is allowed, `false` if not.	boolean
move	Set this to `true` if moving is allowed, `false` if not.	boolean
info	The draginfo argument of the subsequent callbacks is determined by this return value. By default, 'info' returns the string specified by the Drag Info property. By modifying the 'info' return value you can control the response of the subsequent callbacks.	string
files	A table with file paths for evaluation by external software when the drop operation is executed there.	table with file paths as strings

onDropInsert

onDropInsert(viewname, draginfo, copy)

Description

Callback for the target of the drag operation when the drop is executed.

Arguments

Argument	Description	Value Type
viewname	The name of the targeted view.	string
draginfo	This string is specified by the 'info' return value of the onDropGetInfo callback when the drag operation starts.	string
copy	Indicates if the drag is a copy operation.	string

onDropDone

onDropDone(viewname, draginfo, copy)

Description

This callback is called when the drop operation is complete.

Arguments

Argument	Description	Value Type
viewname	The name of the source view.	string
draginfo	This string is specified by the 'info' return value of the onDropGetInfo callback when the drag operation starts.	string
copy	Indicates if the drag is a copy operation.	string

HALion 7.0.0