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Normal Topic Drag and Drop/interactive?? (Read 4021 times)
TRB
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Meppy knows all!!

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Drag and Drop/interactive??
May 14th, 2016 at 2:00am
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Hi,
    I am looking to add some bar graphs to my current project (which I use mind fusion scheduling control and love it!).

Is it possible to enable drag drop functionality to your charts?

Example of what I want to achieve.

I have a data repeater of unassigned data(projects). I want the user to be able to drag that data to the bar graph where it adds a new stacked series to the graph it was dropped (assigning the data to a resource) This new stacked series (and any other series) needs to be able to be dragged and dropped to any other series (resource).

Please let me know if you need me to explain it a different way.  Huh
  
Regards,
TRB
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Slavcho
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Re: Drag and Drop/interactive??
Reply #1 - May 16th, 2016 at 7:54am
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Hi,

You can handle data dragged from another control to the chart like this -

Code
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chart.AllowDrop = true;

chart.DragEnter += (s, e) =>
	e.Effect = DragDropEffects.Copy;

chart.DragDrop += (s, e) =>
	chart.Series.Add(
		new BarSeries(
			new double[] { 5, 5, 5 }, null, null));


Letting users start drag and drop operation from a bar in the chart should look like this -

Code
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chart.MouseDown += (s, e) =>
{
	var hit = chart.HitTest(e.Location);
	if (hit != null)
		chart.DoDragDrop(chart.Series.IndexOf(hit.Series), DragDropEffects.Copy);
};


Regards,
Slavcho
Mindfusion
  
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TRB
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Re: Drag and Drop/interactive??
Reply #2 - May 17th, 2016 at 6:57am
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Thanks so much for the response. This is exactly what I am after. I am however struggling to convert this to vb.net.... Embarrassed .... it looks like another one of your controls I will have to start using though!
  
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TRB
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Slavcho
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Re: Drag and Drop/interactive??
Reply #3 - May 17th, 2016 at 7:56am
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Hi,

That code uses lambda expressions, you can find how to write them in VB.NET here -
https://msdn.microsoft.com/en-us/library/bb531253.aspx

Here is equivalent (auto-converted) VB.NET code -

Code
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AddHandler chart.DragEnter, Sub(s, e) e.Effect = DragDropEffects.Copy

AddHandler chart.DragDrop, Sub(s, e) chart.Series.Add(New BarSeries(New Double() {5, 5, 5}, Nothing, Nothing))

AddHandler chart.MouseDown, Sub(s, e)
	Dim hit = chart.HitTest(e.Location)
	If hit IsNot Nothing Then
		chart.DoDragDrop(chart.Series.IndexOf(hit.Series), DragDropEffects.Copy)
	End If
End Sub


It does not look as nice as in C#, so maybe you'd better use classic event handler subs Wink

Regards,
Slavcho
Mindfusion
  
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