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Snapping per Day

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GanttView
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Ralf
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Ralf asked on 08 Aug 2014, 11:07 AM
How can i implement the behaviour that when a user edit´s a Task by moving start and end date the control only snaps every day.

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George
Telerik team
answered on 13 Aug 2014, 09:09 AM
Hello Ralf,

Thank you for writing.

You can use the SelecteditemChanged event and subscribe to the PropertyChanged event of the selected item. Then, you can change its Start:
this.GanttView.SelectedItemChanged += GanttView_SelectedItemChanged;
...
GanttViewDataItem item;
bool suspendChanged;
void GanttView_SelectedItemChanged(object sender, GanttViewSelectedItemChangedEventArgs e)
{
    if (item != null)
    {
        item.PropertyChanged -= item_PropertyChanged;
    }
 
    item = e.Item;
    if (item != null)
    {
        e.Item.PropertyChanged += item_PropertyChanged;
    }
}
 
void item_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    if (e.PropertyName == "Start" && !suspendChanged)
    {
        suspendChanged = true;
        item.Start = new DateTime(item.Start.Year, item.Start.Month, item.Start.Day);
        suspendChanged = false;
    }
 
}

I hope this helps.

Regards,
George
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Puffeltje
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answered on 20 Jun 2015, 09:04 PM
It is a pitty that the answers are only for c++ or VB. I don't understand C++ but this solution is possibly also suitable for my problem. Can you translate this solution to VB? 
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Hristo
Telerik team
answered on 23 Jun 2015, 01:26 PM
Hello Puffeltje,

Thank you for writing.

Please see below the VB version of the snippet of my colleague: 
Private item As GanttViewDataItem
Private suspendChanged As Boolean
 
Sub New()
 
    InitializeComponent()
    AddHandler Me.RadGanttView1.SelectedItemChanged, AddressOf RadGanttView1_SelectedItemChanged
End Sub
 
Private Sub RadGanttView1_SelectedItemChanged(sender As Object, e As Telerik.WinControls.UI.GanttViewSelectedItemChangedEventArgs)
    If item IsNot Nothing Then
        RemoveHandler item.PropertyChanged, AddressOf item_PropertyChanged
    End If
 
    item = e.Item
    If item IsNot Nothing Then
        AddHandler e.Item.PropertyChanged, AddressOf item_PropertyChanged
    End If
End Sub
 
Private Sub item_PropertyChanged(sender As Object, e As System.ComponentModel.PropertyChangedEventArgs)
    If e.PropertyName = "Start" AndAlso Not suspendChanged Then
        suspendChanged = True
        item.Start = New DateTime(item.Start.Year, item.Start.Month, item.Start.Day)
        suspendChanged = False
    End If
End Sub

We also have a free online C# to VB and vice versa converter located here: http://converter.telerik.com/

I hope this helps. Should you have further questions please do not hesitate to write back.

Regards,
Hristo Merdjanov
Telerik
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GanttView
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Ralf
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George
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Puffeltje
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Hristo
Telerik team
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