private static void OnIsSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RadListViewItem item = d as RadListViewItem;
item.isSelectedCache = (bool)e.NewValue;
item.ChangeVisualState(true);
}
private static void OnIsHandleEnabled(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RadListViewItem item = d as RadListViewItem;
item.IsHandleEnabled = (bool)e.NewValue;
item.ChangeVisualState(true);
}
private static bool CanCapturePointer(RadListViewItem listViewItem, Pointer pointer)
{
if (listViewItem.CapturePointer(pointer))
{
listViewItem.ReleasePointerCapture(pointer);
return(true);
}
return(false);
}
/// <summary>
/// Determines whether drag operation can star with the specified item.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>Whether drag operation can start.</returns>
public virtual bool CanStartDrag(RadListViewItem item)
{
if (item == null || this.Owner == null)
{
return(false);
}
else
{
return(true);
}
}
/// <inheritdoc/>
protected override void OnPointerMoved(PointerRoutedEventArgs e)
{
base.OnPointerMoved(e);
Pointer pointer = e.Pointer;
PointerPoint pointerPoint = e.GetCurrentPoint(this);
if (!this.isReordering && pointerPoint.Properties.IsLeftButtonPressed && pointer.PointerDeviceType == PointerDeviceType.Mouse &&
RadListViewItem.CanCapturePointer(this, pointer))
{
var source = e.OriginalSource;
if (source != this.firstHandle && source != this.secondHandle)
{
this.listView.OnItemReorderHandlePressed(this, e, DragDropTrigger.MouseDrag, null);
}
}
}
internal void PrepareDragVisual(DragAction action)
{
var owner = this.ListView;
var dragContent = owner.DragBehavior.GetDragVisual(this);
this.dragVisual = this.ListView.GetContainerForItem();
this.dragVisual.Orientation = this.Orientation;
this.dragVisual.Width = this.ActualWidth;
this.dragVisual.Height = this.ActualHeight;
this.dragVisual.ListView = this.ListView;
this.dragVisual.isReordering = true;
this.dragVisual.IsSelected = this.IsSelected;
this.ListView.PrepareContainerForItem(this.dragVisual, this.DataContext);
this.Opacity = 0;
if (action == DragAction.ItemAction)
{
this.PrepareActionContent();
}
}
internal FrameworkElement GetReorderVisual(RadListViewItem radListViewItem)
{
return(radListViewItem.dragVisual);
}
internal void OnDragStarted(RadListViewItem item)
{
}
/// <summary>
/// Called when drag drop operation completed.
/// </summary>
/// <param name="item">The source item being dragged.</param>
/// <param name="dragSuccessful">Determines whether current drag operation completed successfully.</param>
public virtual void OnDragDropCompleted(RadListViewItem item, bool dragSuccessful)
{
}
/// <summary>
/// Gets the drag visual for specified item.
/// </summary>
/// <param name="item">The item.</param>
public virtual FrameworkElement GetDragVisual(RadListViewItem item)
{
return(item);
}
void IDragDropElement.OnDragDropComplete(DragCompleteContext context)
{
var data = context.PayloadData as ReorderItemsDragOperation;
if (data != null)
{
this.FinalizeReorder(context);
var isExecuted = false;
RadListViewItem destinationItem = null;
ItemReorderPlacement placement = 0;
if (data.InitialSourceIndex < data.CurrentSourceReorderIndex)
{
destinationItem = this.reorderCoordinator.Host.ElementAt(data.CurrentSourceReorderIndex - 1) as RadListViewItem;
placement = ItemReorderPlacement.After;
if (destinationItem == null)
{
destinationItem = this.reorderCoordinator.Host.ElementAt(data.CurrentSourceReorderIndex + 1) as RadListViewItem;
placement = ItemReorderPlacement.Before;
}
}
else if (data.InitialSourceIndex > data.CurrentSourceReorderIndex)
{
destinationItem = this.reorderCoordinator.Host.ElementAt(data.CurrentSourceReorderIndex + 1) as RadListViewItem;
placement = ItemReorderPlacement.Before;
if (destinationItem == null)
{
destinationItem = this.reorderCoordinator.Host.ElementAt(data.CurrentSourceReorderIndex - 1) as RadListViewItem;
placement = ItemReorderPlacement.After;
}
}
if (destinationItem != null)
{
var dataItem = data.Data;
var destinationDataItem = destinationItem.DataContext;
IDataGroup dataGroup = null;
IDataGroup destinationDataGroup = null;
if (this.listView.GroupDescriptors.Count > 0)
{
dataGroup = this.listView.Model.FindItemParentGroup(dataItem);
destinationDataGroup = this.listView.Model.FindItemParentGroup(destinationDataItem);
}
var commandContext = new ItemReorderCompleteContext(dataItem, dataGroup, destinationDataItem, destinationDataGroup, placement);
isExecuted = this.ListView.commandService.ExecuteCommand(CommandId.ItemReorderComplete, commandContext);
}
if (isExecuted)
{
// TODO: Data provider does not handle well reordering of items in groups.
// Remove this workaround once we fix the reordering in the data provider.
if (this.listView.GroupDescriptors.Count > 0)
{
this.listView.updateService.RegisterUpdate((int)UpdateFlags.AffectsData);
}
}
else
{
this.reorderCoordinator.CancelReorderOperation(this, data.InitialSourceIndex);
}
}
else
{
if (context.DragSuccessful)
{
double offset = 0;
var dragMode = DragDrop.GetDragPositionMode(this);
if (this.ListView.Orientation == Orientation.Horizontal)
{
switch (dragMode)
{
case DragPositionMode.RailXForward:
offset = Math.Max(0, this.dragY);
break;
case DragPositionMode.RailXBackwards:
offset = Math.Min(0, this.dragY);
break;
case DragPositionMode.RailX:
offset = this.dragY;
break;
default:
break;
}
}
else
{
switch (dragMode)
{
case DragPositionMode.RailXForward:
offset = Math.Max(0, this.dragX);
break;
case DragPositionMode.RailXBackwards:
offset = Math.Min(0, this.dragX);
break;
case DragPositionMode.RailX:
offset = this.dragX;
break;
default:
break;
}
}
var swipeContext = new ItemSwipeActionCompleteContext(this.DataContext, this, offset);
bool isExecuted = this.ListView.commandService.ExecuteCommand(CommandId.ItemSwipeActionComplete, swipeContext);
if (isExecuted)
{
this.UpdateActionContentClipping(swipeContext.FinalDragOffset);
this.isDraggedForAction = true;
this.ListView.swipedItem = this;
}
else
{
this.ClearActionContent();
}
}
else
{
this.ClearActionContent();
this.ListView.CleanupSwipedItem();
}
}
this.Opacity = 1;
DragDrop.SetDragPositionMode(this, DragPositionMode.Free);
this.ListView.InvalidatePanelArrange();
}
