$(document).ready(function () {          

var flexyGantt = $gantt_container.data("FlexyGantt");

            flexyGantt.TaskTimeChanged.subscribe(function (sender, args) {

                var flexyNodeData = args.FlexyNodeData;

                $currentChartRow = flexyNodeData.ChartRow();

                var rowData = $currentChartRow[0]["data-grid-item"];

                var movedTask = args.DataSource; // moved or resized bar.

                // Persisting the new values into the data soruce right away. If we don't do this, the gantt will do this after you return from this function.

                movedTask.StartTime = args.StartTime;

                movedTask.EndTime = args.EndTime;

                var inspectTimeRange = {

                    StartTime: movedTask.StartTime,

                    EndTime: movedTask.EndTime

                }

                var redrawBars = false;

                var currentRowTasks = rowData.Data().Tasks;

                //Sorting tasks by startTime.

                currentRowTasks.sort(function (a, b) { return a.StartTime - b.StartTime });

                if (args.Type == "ResizeStart")//task resize.

                {

                    //Moving tasks from right to left while resizing task's start.

                    for (var i = currentRowTasks.length - 1; i >= 0; i--) {

                        var task = currentRowTasks[i];

                        if (movedTask != task) {

                            var isOverlapping = preventOverlapping(inspectTimeRange, task, redrawBars, args);

                            if (isOverlapping)

                                inspectTimeRange.StartTime = task.StartTime;

                        }

                    }

                }

                else {

                    //Moving tasks from left to right while resizing end and while moving tasks.

                    for (var i = 0; i < currentRowTasks.length; i++) {

                        var task = currentRowTasks[i];

                        if (movedTask != task) {

                            var isOverlapping = preventOverlapping(inspectTimeRange, task, redrawBars, args);

                            if (isOverlapping)

                                inspectTimeRange.EndTime = task.EndTime;

                        }

                    }

                }

                // Force a redraw (or if you use a change notifying model like knockout, the gantt will then auto update)

                if (redrawBars == true) {

                    $currentChartRow.find("td").data("radiantqTasksListControl").RedrawTaskRow()

                }

                // Here you know that changes are made into the "moved task" as well as the "adjusted task". You can now call the server to validate.

            });

            function preventOverlapping(inspectTimeRange, task, redrawBars, args) {

                if (isOverlaping(inspectTimeRange, task))//if its overlap we have to move the bars.

                {

                    redrawBars = true;

                    var diff;

                    if (args.Type == "ResizeStart")//task resize.

                    {

                        diff = new RQTimeSpan(inspectTimeRange.StartTime - task.EndTime);

                    }

                    else// endTask resizing and task moved

                    {

                        diff = new RQTimeSpan(inspectTimeRange.EndTime - task.StartTime);

                    }

                    // Shift the other task that's overlapping to the right of the moved bar.

                    task.StartTime = task.StartTime.addTimeSpan(diff);

                    task.EndTime = task.EndTime.addTimeSpan(diff);

                    return true;

                }

                return false;

            }

            function isOverlaping(task1, task2) {

                if (task1.StartTime >= task2.StartTime && task1.StartTime < task2.EndTime)

                    return true;

                if (task1.EndTime > task2.StartTime && task1.EndTime <= task2.EndTime)

                    return true;

                if (task2.StartTime > task1.StartTime && task2.EndTime < task1.EndTime)

                    return true;

                return false;

            }

});