Drag/Drop - save and resequence underlying datasource at the end

[Joseph Hanna]

In my app, I want the user to be able to resequence all of the listview items and then tap "Save" at the end to confirm all is ok before touching the datasource. 

I have checked out this article, but it doesn't do what I want.  It updates the underlying data source with each drag/drop. I want to do this at the end in bulk. https://www.syncfusion.com/forums/154831/saving-re-order-items-in-listview-which-have-grouping-enable

After tapping a Save button, I want to:

1. Loop through the listview items as shown in the new sequence

2. Perform the move on the underlying datasource

How can I loop through the listview items in the new re-ordered sequence as shown, with a link to the underlying datasource for each item so I can update those records?

Thanks

[Lakshmi Natarajan]

Hi Joseph, 

 

Thank you for using Syncfusion products. 

 

We have checked the reported query “Drag/Drop - save and resequence underlying datasource at the end” from our side. We would like to inform you that you can get the reordered items from the ListView.DataSource.DisplayItems. Please refer the following code snippets to achieve your requirement, 

 

In the SaveButton.Clicked event, get the reordered list from the DataSource.DisplayItems and set it to the underlying ViewModel collection. 

public class Behavior : Behavior<ContentPage> 

{ 

    SfListView ListView; 

    Button SaveButton; 

 

    protected override void OnAttachedTo(ContentPage bindable) 

    { 

        ListView = bindable.FindByName<SfListView>("ToDoListView"); 

        SaveButton = bindable.FindByName<Button>("saveButton"); 

        SaveButton.Clicked += SaveButton_Clicked; 

        base.OnAttachedTo(bindable); 

    } 

 

    private void SaveButton_Clicked(object sender, EventArgs e) 

    { 

        var newList = new List<ToDoItem>(); 

        foreach (var item in ListView.DataSource.DisplayItems) 

        { 

            newList.Add((ToDoItem)item); 

        } 

        (ListView.BindingContext as ViewModel).ToDoList = new ObservableCollection<ToDoItem>(newList); 

    } 

} 

 

We have prepared a sample based on your requirement and you can download it from the following link, 

Sample: https://www.syncfusion.com/downloads/support/directtrac/general/ze/159573790026146 

 

Please let us know if you need further assistance. 

 

Regards, 

Lakshmi Natarajan 

[Joseph Hanna]

Thanks Lakshmi! That is perfect

[Lakshmi Natarajan]

Hi Joseph, 

 

Thank you for the update. 

 

We are glad that our solution meets your requirement. Please let us know if you need any further update. As always we are happy to help you out. 

 

Regards, 

Lakshmi Natarajan