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matt.s
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Drag Drop
Jun 10th, 2010 at 12:24pm
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Hi,

Does the calendar support drag and drop events?

I have set AllowDrop to True, but nothing is fired in the Drop or DragOver events of a calendar.

I'm trying to drap/drop appointments between two diaries.

Thanks
Matt
  
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Meppy
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Re: Drag Drop
Reply #1 - Jun 10th, 2010 at 1:08pm
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I subscribe to the events and they fire as expected. What code are you using?

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Meppy
  
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matt.s
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Re: Drag Drop
Reply #2 - Jun 10th, 2010 at 1:24pm
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Hi,

My XAML is as follows;

Code
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    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <planner:Calendar Name="calendar1"
                          Grid.Column="0"
                          Theme="Windows2003"
                          CurrentView="Timetable"
                          AllowInplaceCreate="False"
                          AllowInplaceEdit="False"/>

        <planner:Calendar Name="calendar2"
                          Grid.Column="1"
                          Theme="Windows2003"
                          CurrentView="Timetable"
                          AllowDrop="True"
                          AllowInplaceCreate="False"
                          AllowInplaceEdit="False"
                          Drop="calendar_Drop"
                          DragOver="calendar_DragOver" />
    </Grid>


My code behind creates dates and a resource for each calender, and an appointment for calendar1.

When I drag the appointment from calendar1 to calendar2, neither the Drop or DragOver events fire.
  
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Meppy
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Re: Drag Drop
Reply #3 - Jun 10th, 2010 at 1:37pm
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Modifying an appointment interactively within the calendar is not considered a Windows drag&drop operation. It is a native operation for the Calendar control which is only effective within the control.

In order to initiate a true Windows (cross-control and cross-application) drag&drop, you need to invoke the System.Windows.DragDrop.DoDragDrop static method. I found that a very convenient place to initiate this operation is in the ItemClick event of the source Calendar control (calendar1 in your case).

My event handler looks similar to the following:

Code
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private void calendar1_ItemClick(object sender, ItemMouseEventArgs e)
{
      calendar1.ResetDrag();
      DragDrop.DoDragDrop(calendar1, e.Item, DragDropEffects.Copy);
}

Let me know if this works.

Regards,
Meppy
  
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matt.s
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Re: Drag Drop
Reply #4 - Jun 10th, 2010 at 3:29pm
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Hi,

Yes you are right - this is now working fine.

How do you get the drop location? I have the code below, but it always returns a null datetime.

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            Point p = e.GetPosition(calendar);
            Point pt = this.PointToScreen(p);

            // get the start/end time of the drop location
            DateTime? startTime = calendar.GetDateAt(pt);
            if (!startTime.HasValue)
                return;


Thanks
Matt
  
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Meppy
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Re: Drag Drop
Reply #5 - Jun 11th, 2010 at 5:44am
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The point supplied as argument should be in calendar coordinates. Therefore, in your case, simply pass p.

Let me know if this helps.

Regards,
Meppy
  
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matt.s
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Re: Drag Drop
Reply #6 - Jun 14th, 2010 at 2:43pm
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Yes - this works.

Thanks for your help.
  
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