Win RT Xaml GridView: Drag select multiple items - xaml

Question

I'm trying to select multiple items in a GridView by hovering over them with pressed mouse (like drawing). I tried to achieve this with the PointerEntered event but I'm unable to change the selction from code. Is there a way to implement a custom selection mode?
This didn't work for me because I can't use Style.Triggers in Win RT XAML:
https://stackoverflow.com/a/2886223/5739170

Answer 1

You will have to inherit the gridview control and override the PrepareContainerForItemOverride method:
The code:
public class MyGridView : GridView
{
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
(element as GridViewItem).PointerMoved += MyGridView_PointerMoved;
base.PrepareContainerForItemOverride(element, item);
}
private void MyGridView_PointerMoved(object sender, PointerRoutedEventArgs e)
{
//your logic for setting the isselected
(sender as GridViewItem).IsSelected = true;
}
}

Answer 2

This is how I finally implemented it based on Chirag Shah's answer:
class MyGridView : GridView
{
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
(element as GridViewItem).PointerEntered += SelectItemOnEntered;
(element as GridViewItem).AddHandler(PointerPressedEvent, new PointerEventHandler(SelectItemOnPressed), true);
base.PrepareContainerForItemOverride(element, item);
}
private void SelectItemOnPressed(object sender, PointerRoutedEventArgs e)
{
(sender as GridViewItem).IsSelected = !(sender as GridViewItem).IsSelected;
}
private void SelectItemOnEntered(object sender, PointerRoutedEventArgs e)
{
if (e.Pointer.IsInContact)
(sender as GridViewItem).IsSelected = !(sender as GridViewItem).IsSelected;
}
}
I hope this helps everyone who wants to implement this selection mode.