public void DemoteLayer(LayerCollection owningCollection, int position)
{
// Skip if the layer can't be moved because its already at the bottom.
if (position == owningCollection.Count - 1)
{
return;
}
// Move the layer by removing it from its current position and inserting it at the next higher position.
Layer selectedLayer = owningCollection[position];
owningCollection.RemoveAt(position);
owningCollection.Insert(position + 1, selectedLayer);
}
public void PromoteLayer(LayerCollection owningCollection, int position)
{
// Skip if the layer can't be moved up because it is already at the top.
if (position < 1)
{
return;
}
// Move the layer by removing it from its current position and adding it at the next lower position.
Layer selectedLayer = owningCollection[position];
owningCollection.RemoveAt(position);
owningCollection.Insert(position - 1, selectedLayer);
}
public override void MoveRow(UITableView tableView, NSIndexPath sourceIndexPath, NSIndexPath destinationIndexPath)
{
// Find the source and destination lists (based on the section of the source and destination index).
LayerCollection source = sourceIndexPath.Section == 0 ? IncludedLayers : ExcludedLayers;
LayerCollection destination = destinationIndexPath.Section == 0 ? IncludedLayers : ExcludedLayers;
// Find the layer that is being moved.
Layer movedLayer = source[sourceIndexPath.Row];
// Remove the layer from the source list and insert into the destination list.
source.RemoveAt(sourceIndexPath.Row);
destination.Insert(destinationIndexPath.Row, movedLayer);
// Reload the table now that the data has changed.
tableView.ReloadData();
}
private void ListBoxItem_OnDrop(object sender, DragEventArgs e)
{
// This method is called when the user finishes dragging while over the listbox.
// Find the source and destination list boxes.
ListBox sourceBox = FindParentListBox(_originatingListBoxItem);
if (sourceBox == null)
{
// Return if the source isn't valid - happens when duplicate events are raised.
return;
}
// Find the list box that the item was dropped on (i.e. dragged to).
ListBox destinationBox = FindParentListBox((UIElement)sender);
// Get the data that is being dropped.
Layer draggedData = (Layer)e.Data.GetData(typeof(ArcGISMapImageLayer));
// Find where in the respective lists the items are.
int indexOfRemoved = sourceBox.Items.IndexOf(draggedData);
int indexOfInsertion;
// Sender is the control that the item is being dropped on. Could be a listbox or a listbox item.
if (sender is ListBoxItem)
{
// Find the layer that the item represents.
Layer targetData = ((ListBoxItem)sender).DataContext as Layer;
// Find the position of the layer in the listbox.
indexOfInsertion = destinationBox.Items.IndexOf(targetData);
}
else if (destinationBox != sourceBox)
{
// Drop the item at the end of the list if the user let go of the item on the empty space in the box rather than the list item.
// This works because both the listbox and its individual listbox items participate in drag and drop.
indexOfInsertion = destinationBox.Items.Count - 1;
}
else
{
return;
}
// Find the appropriate source and destination boxes.
LayerCollection sourceList = sourceBox == IncludedListBox ? _viewModel.IncludedLayers : _viewModel.ExcludedLayers;
LayerCollection destinationList = destinationBox == IncludedListBox ? _viewModel.IncludedLayers : _viewModel.ExcludedLayers;
// Return if there is nothing to do.
if (sourceList == destinationList && indexOfRemoved == indexOfInsertion)
{
return;
}
if (sourceBox == destinationBox && indexOfRemoved < indexOfInsertion)
{
indexOfInsertion -= 1;
}
// Perform the move.
sourceList.RemoveAt(indexOfRemoved);
destinationList.Insert(indexOfInsertion + 1, draggedData);
}