Hello,

I just started working with the Scheduling library and I am stuck on one thing:

I am trying to disallow adding and item to a day which already has an item added. This is no problem on freshly created items with simple if statements.

But when you have two items that do not overlap  you can still drag one item over a day with another existing item, so the items will overlap.

I do not want to disable the resizing and moving of items totally, because it's a nice feature to have.
I just don't want items to be resized and moved over other existing items (and overlap them).

I have tried alot of the setting and searched the forum but I could not get any further with this, so I hope some nice person could point me in the right direction.

Thanks in advance and best regards

Thanks alot Meppy, that was exactly what I needed to start with!

Your code was really nice and simple, but I tried something more advanced (or chaotic?):

        private void _calendar_ItemModifying(object sender, ItemModifyConfirmEventArgs e)
        {
            ItemCollection items = _calendar.Schedule.GetAllItems(e.NewStartTime, e.NewEndTime);



            if (items.Count > 0)
            {
                if (items.Contains(e.Item)) items.Remove(e.Item);



                foreach (Item item in items)
                {
                    // resize
                    if (e.ResizeEnd || e.ResizeStart)
                    {
                        // right to left
                        if (e.NewStartTime < item.EndTime && e.NewStartTime > item.StartTime)
                        {
                            e.NewStartTime = item.EndTime;
                        }

                        // left to right
                        if (e.NewEndTime > item.StartTime && e.NewStartTime < item.StartTime)
                        {
                            e.NewEndTime = item.StartTime;
                        }



                    }
                        // move
                    else
                    {
                        if (e.NewEndTime > item.StartTime && e.NewStartTime < item.StartTime)
                        {
                            TimeSpan ts;
                            ts = e.NewEndTime - e.NewStartTime;
                            e.NewStartTime = item.EndTime;
                            e.NewEndTime = item.EndTime.Add(ts);
                        }
                        if (e.NewStartTime < item.EndTime)
                        {
                            TimeSpan ts;
                            ts = e.NewEndTime - e.NewStartTime;
                            e.NewEndTime = item.StartTime;
                            e.NewStartTime = item.StartTime.Subtract(ts);
                        }
                    }


                }
            }
 

this works nicely if i have one item [ITEM1] and create a [ITEM2]. but if i have a little space between [ITEM1] and [ITEM2] and create a new [ITEM3] which is bigger than the space between 1&2 and move the ITEM3 into the space, it only snaps to one ITEM and not to both.

I guess I have the loop at a wrong position.

What are you trying to achieve - some sort of automatic alignment of the modified items to the rest of the items?

Regards,
Meppy

Handle the Calendar.ItemModified event (in addition to ItemModifying, which should remain intact) and use the following implementation for the handler:

DateTime closestStart = DateTime.MinValue;
DateTime closestEnd = DateTime.MaxValue;
foreach (Item item in calendar.Schedule.Items)
{
      if (item.EndTime < e.Item.StartTime && item.EndTime > closestStart)
            closestStart = item.EndTime;

      if (item.StartTime > e.Item.EndTime && item.StartTime < closestEnd)
            closestEnd = item.StartTime;
}

if (closestStart != DateTime.MinValue &&
      closestEnd != DateTime.MaxValue)
{
      e.Item.StartTime = closestStart;
      e.Item.EndTime = closestEnd;
      calendar.Invalidate();
} 

The above code should check an item, which has just been modified and resize it so that it fills the available space completely.

Regards,
Meppy

Check out this sample:

https://mindfusion.eu/_samples/_sample_AutoItems.zip

Regards,
Meppy