Multiple selection lists

In the following example, the list widget shown at right is created with its selection policy set to XmMULTIPLESELECT. A multiple selection callback is added, to correspond with the selection policy.

| items shell list | items := #('item1' 'item2' 'item3' 'item4' 'item5'). shell := CwTopLevelShell createApplicationShell: 'shell' argBlock: nil.

list := shell

createList: 'list'

argBlock: [:w |

w

selectionPolicy: XmMULTIPLESELECT;

items: items].

list

addCallback: XmNmultipleSelectionCallback

receiver: self

selector: #multipleSelect:clientData:callData:

clientData: nil.

list manageChild.

shell realizeWidget.

The call data of the multipleSelection callback specifies the items that were selected. The callback method below prints the entire callback data on the transcript. All components of the call data can be retrieved using the corresponding accessor method.

multipleSelect: widget clientData: clientData callData: callData

"Print the call data."

Transcript cr; show: 'Multiple selection call data: ',

callData printString

If Item 2 and Item 3 were selected in order, as in the illustration, the transcript output would be:

Multiple selection call data: CwListCallbackData(

reason -> 24

item -> 'Item 3'

itemPosition -> 3

selectedItems -> OrderedCollection ('Item 2' 'Item 3')

selectedItemCount -> 2

selectedItemPositions -> OrderedCollection(2 3))