FreeTimeCalculator Class

Enables you to find available spare time intervals within the specified period.

Namespace: DevExpress.XtraScheduler.Tools

Assembly: DevExpress.XtraScheduler.v20.1.Core.dll

Declaration

public class FreeTimeCalculator :
    ITimeZoneHost
Public Class FreeTimeCalculator
    Implements ITimeZoneHost

Remarks

The FreeTimeCalculator class enables you to find free time slots within the specified time interval. It can be helpful when searching for time periods suitable for a new meeting arrangement. The time interval can be queried based on a specific resource.

The FreeTimeCalculator.CalculateFreeTime method finds all available spare time intervals within the specified period of time. To find the nearest free slot with the specified duration, use the FreeTimeCalculator.FindFreeTimeInterval method. The search technique calculates the time in use based on the appointments currently contained within the Scheduler Storage. You can restrict the search to filtered appointments via the FreeTimeCalculator.ApplyAppointmentFilters property.

To find the spare time periods in work time only, so that holidays, night shifts and lunch hours are excluded, handle the FreeTimeCalculator.IntervalFound event. It gives you the flexibility to decide whether a particular free time slot satisfies your requirements. Use the TimeIntervalCollectionEx collection methods to modify the time intervals as needed.

The following code sample illustrates the implementation of the method used to find a free time slot which has a specified duration, or is longer than that, before the end of the current work week.

Examples

The following code sample illustrates the implementation of the method used to find a free time slot which has a specified duration, or is longer than that, before the end of the current work week.

using DevExpress.XtraScheduler;
using DevExpress.XtraScheduler.Tools;
using System;
using System.Windows.Forms;

namespace FreeTimeIntervals
{
    public partial class Form1 : Form {
        TimeZoneHelper timeZoneHelper;
        // Specify non-working time interval.
        TimeOfDayInterval nonWorkingTime = new TimeOfDayInterval(TimeSpan.FromHours(18), TimeSpan.FromDays(1) + TimeSpan.FromHours(9));

        internal TimeZoneHelper TimeZoneHelper { get { return timeZoneHelper; } }
        internal TimeOfDayInterval NonWorkingTime { get { return nonWorkingTime; } set { nonWorkingTime = value; } }

        public Form1() {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e) {
            // TODO: This line of code loads data into the 'xtraSchedulingDataSet1.Resources' table. You can move, or remove it, as needed.
            this.resourcesTableAdapter.Fill(this.xtraSchedulingDataSet1.Resources);
            // TODO: This line of code loads data into the 'xtraSchedulingDataSet.Appointments' table. You can move, or remove it, as needed.
            this.appointmentsTableAdapter.Fill(this.xtraSchedulingDataSet.Appointments);

            timeZoneHelper = new TimeZoneHelper(this.schedulerControl1.OptionsBehavior.ClientTimeZoneId);
        }

        private void button1_Click(object sender, EventArgs e) {
            TimeSpan duration = ((DateTime)slotDuration.EditValue).TimeOfDay;
            DateTime start = schedulerControl1.ActiveView.SelectedInterval.End;
            DateTime startOfWeek = DevExpress.XtraScheduler.Native.DateTimeHelper.GetStartOfWeek(start);
            TimeInterval interval = new TimeInterval(start, startOfWeek.AddDays(7));
            TimeInterval freeTime = FindInterval(interval, duration);
            string text;
            if (TimeInterval.Equals(freeTime, TimeInterval.Empty))
                text = "Not found";
            else {
                TimeInterval clientFreeInterval = TimeZoneHelper.ToClientTime(freeTime);
                text = "Free time interval with duration " + clientFreeInterval.Duration.ToString() +
                    " is found! \n\r It starts on " + clientFreeInterval.Start.Date.ToShortDateString() +
                    " at " + clientFreeInterval.Start.TimeOfDay.ToString() + ".";
                schedulerControl1.ActiveView.SetSelection(clientFreeInterval, ResourceEmpty.Resource);
            }
            MessageBox.Show(text, "Search Result", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
        private TimeInterval FindInterval(TimeInterval clientInterval, TimeSpan duration) {
            FreeTimeCalculator calculator = new FreeTimeCalculator(schedulerControl1.Storage);
            // Set a handler for the IntervalFound event.
            calculator.IntervalFound += new IntervalFoundEventHandler(OnIntervalFound);
            TimeInterval interval = TimeZoneHelper.FromClientTime(clientInterval);
            // Call the method which raises the event.
            return calculator.FindFreeTimeInterval(interval, duration, true);
        }
        private void OnIntervalFound(object sender, IntervalFoundEventArgs args) {
            TimeIntervalCollectionEx freeIntervals = args.FreeIntervals;
            DateTime start = freeIntervals.Start.Date.AddDays(-1);
            DateTime end = freeIntervals.End;
            while (start < end) {
                RemoveNonWorkingTime(freeIntervals, start);
                RemoveNonWorkingDay(freeIntervals, start);
                start += TimeSpan.FromDays(1);
            }
        }
        private void RemoveNonWorkingTime(TimeIntervalCollectionEx freeIntervals, DateTime date) {
            DateTime clientDate = TimeZoneHelper.ToClientTime(date).Date;        

            TimeInterval clientNonWorkingTime = new TimeInterval(clientDate + NonWorkingTime.Start, clientDate + NonWorkingTime.End);
            freeIntervals.Remove(TimeZoneHelper.FromClientTime(clientNonWorkingTime));
        }
        private void RemoveNonWorkingDay(TimeIntervalCollectionEx freeIntervals, DateTime date) {
            DateTime clientDate = TimeZoneHelper.ToClientTime(date).Date;
            bool isWorkDay = schedulerControl1.WorkDays.IsWorkDay(clientDate);
            if (!isWorkDay) {
                TimeInterval clientInterval = new TimeInterval(clientDate, TimeSpan.FromDays(1));
                freeIntervals.Remove(TimeZoneHelper.FromClientTime(clientInterval));
            }
        }
        private void OnApptChangedInsertedDeleted(object sender, PersistentObjectsEventArgs e) {
            appointmentsTableAdapter.Update(xtraSchedulingDataSet);
            xtraSchedulingDataSet.AcceptChanges();
        }
    }
}

Inheritance

Object
FreeTimeCalculator
See Also