How to: Custom Paint Appointments

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Use the SchedulerControl.AppointmentViewInfoCustomizing event to modify the appointment’s appearance according to a certain condition. This event enables you to change appointment properties, resulting in conditional styling.

The more powerful SchedulerControl.CustomDrawAppointment and SchedulerControl.CustomDrawAppointmentBackground events require drawing procedures to be implemented by a user. The CustomDrawObjectEventArgs.DrawDefault method, along with the CustomDrawObjectEventArgs.Handled value setting is helpful when a combination of default and arbitrary drawings is needed.

The following sample code handles the SchedulerControl.CustomDrawAppointment event to manually paint appointments. The image below shows the result.

CustomDrawAppointment

View Example

using DevExpress.XtraScheduler;
using DevExpress.XtraScheduler.Drawing;
using System.Drawing.Drawing2D;
private void schedulerControl1_CustomDrawAppointment(object sender, CustomDrawObjectEventArgs e) {
    TimeLineAppointmentViewInfo tlvi = e.ObjectInfo as TimeLineAppointmentViewInfo;
    // This code works only for the Timeline View.
    if(tlvi != null) {
        Rectangle r = e.Bounds;
        r.Offset(3, 3);
        string[] s = tlvi.Appointment.Subject.Split(' ');

        for(int i = 0; i < s.Length; i++) {
            using(var foreBrush = new SolidBrush(colorArray[i]))
                e.Cache.DrawString(s[i], tlvi.Appearance.Font, foreBrush,
r, StringFormat.GenericDefault);
            SizeF shift = e.Cache.CalcTextSize(s[i] + " ", tlvi.Appearance.Font);
            r.X += (int)shift.Width;
        }
        e.Handled = true;
    }
}
See Also