FlowOperationEvent  - AS3

package flashx.textLayout.events.examples
{
    import flash.display.Sprite;
    
    import flashx.textLayout.compose.StandardFlowComposer;
    import flashx.textLayout.container.ContainerController;
    import flashx.textLayout.conversion.TextConverter;
    import flashx.textLayout.edit.EditManager;
    import flashx.textLayout.elements.TextFlow;
    import flashx.textLayout.events.FlowOperationEvent;
    import flashx.textLayout.operations.FlowOperation;
    import flashx.textLayout.operations.PasteOperation;
    import flashx.undo.UndoManager;

    public class FlowOperationEvent_example extends Sprite
    {
        private var inputContainer:Sprite;
        private var inputTextFlow:TextFlow;
        private var inputController:ContainerController;
        private var inputEditManager:EditManager;
        private var inputUndoManager:UndoManager;

        public function FlowOperationEvent_example()
        {
            var replaceText:String = "paste text here";
            inputTextFlow = new TextFlow();

            inputContainer = new Sprite();
            inputContainer.x = 30;
            inputContainer.y = 100;

             this.stage.addChild( inputContainer );

            inputController = new ContainerController(inputContainer, 225, 20);
            inputController.verticalScrollPolicy = flashx.textLayout.container.ScrollPolicy.OFF;

            inputTextFlow = TextConverter.importToFlow(replaceText, TextConverter.PLAIN_TEXT_FORMAT);
            inputTextFlow.flowComposer = new StandardFlowComposer(); 
            inputTextFlow.flowComposer.addController(inputController);

            inputUndoManager = new UndoManager();
            inputEditManager = new EditManager(inputUndoManager);
            inputTextFlow.interactionManager = inputEditManager;

            inputTextFlow.addEventListener(FlowOperationEvent.FLOW_OPERATION_BEGIN, opBeginHandler);
            inputTextFlow.addEventListener(FlowOperationEvent.FLOW_OPERATION_END, opEndHandler);
            inputTextFlow.flowComposer.updateAllControllers();
        }

        private function opBeginHandler(evt:FlowOperationEvent):void { 
            var flowOp:FlowOperation = evt.operation; 
            if(flowOp is PasteOperation) {
                trace("You can cancel or modify the paste operation in this event handler.");
            }
        }

        private function opEndHandler(evt:FlowOperationEvent):void { 
            var flowOp:FlowOperation = evt.operation; 
            if(evt.error) {
                trace("You can handle the error here and call preventDefault().");
            }
        }
    }
}