CODEWITHSUNDEEP
c#wpflistview
DudeWhoWantsToLearn
DudeWhoWantsToLearn

Reputation: 771

Get ListViewItem instead of Item from a ListView

For my Drag and Drop from ListView to Canvas, I want the objects to get dropped like I picked them up. For example:

I pick up an Item, and my mouse is 50 pixels lower, and 20 pixels right from the top left corner of the ListViewItem. Then I want the item, when I drop it, to be 50 pixels higher and 20 pixels left, so I get the same position relative to when I picked it up. This is my event that gets triggered, when I click onto an Item and start to drag:

void StackPanel_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        int index = GetCurrentIndex(e.GetPosition);

        var ListIteminstance = ModuleListView.Items[index] as ListViewItem;
        // Now you got the original object and then do what you want. 

        startPoint = e.GetPosition(ListIteminstance);
    }

ListIteminstance is null, cause it cannot convert the item to a ListViewItem. Cause of that, I only get the coordinates "0, 0" from the Item, when I drop it, it's from the top left corner, instead of the relative coordinates where I picked it up

GetCurrentIndex() gets me the index of the Item I am clicking on. But it is not a ListViewItem, but the object of type "MyClass", that I store in the list. Now I'm wondering, how I can get the ListViewItem I am clicking on, so that ListIteminstance is not null

Upvotes: 0

Views: 876

Answers (1)

mm8
mm8

Reputation: 169200

Try this:

var dataObject = ModuleListView.Items[index];
var ListIteminstance = ModuleListView.ItemContainerGenerator.ContainerFromItem(dataObject) 
    as ListViewItem;

Upvotes: 1

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