static void CreateDragAdorner()
{
DataTemplate template = GetDragAdornerTemplate(m_DragInfo.VisualSource);
if (template != null)
{
UIElement rootElement = (UIElement)Application.Current.MainWindow.Content;
UIElement adornment = null;
if (m_DragInfo.Data is IEnumerable && !(m_DragInfo.Data is string))
{
if (((IEnumerable)m_DragInfo.Data).Cast <object>().Count() <= 10)
{
ItemsControl itemsControl = new ItemsControl();
itemsControl.ItemsSource = (IEnumerable)m_DragInfo.Data;
itemsControl.ItemTemplate = template;
// The ItemsControl doesn't display unless we create a border to contain it.
// Not quite sure why this is...
Border border = new Border();
border.Child = itemsControl;
adornment = border;
}
}
else
{
ContentPresenter contentPresenter = new ContentPresenter();
contentPresenter.Content = m_DragInfo.Data;
contentPresenter.ContentTemplate = template;
adornment = contentPresenter;
}
if (adornment != null)
{
adornment.Opacity = 0.5;
DragAdorner = new DragAdorner(rootElement, adornment);
}
}
}
private static void DropTarget_PreviewDragOver(object sender, DragEventArgs e)
{
var elementPosition = e.GetPosition((IInputElement)sender);
if (HitTestUtilities.HitTest4Type <ScrollBar>(sender, elementPosition) ||
HitTestUtilities.HitTest4GridViewColumnHeader(sender, elementPosition) ||
HitTestUtilities.HitTest4DataGridTypesOnDragOver(sender, elementPosition))
{
e.Effects = DragDropEffects.None;
e.Handled = true;
return;
}
var dropInfo = new DropInfo(sender, e, m_DragInfo);
var dropHandler = TryGetDropHandler(dropInfo, sender as UIElement);
var itemsControl = dropInfo.VisualTarget;
dropHandler.DragOver(dropInfo);
if (DragAdorner == null && m_DragInfo != null)
{
CreateDragAdorner(dropInfo);
}
if (DragAdorner != null)
{
var tempAdornerPos = e.GetPosition(DragAdorner.AdornedElement);
if (tempAdornerPos.X >= 0 && tempAdornerPos.Y >= 0)
{
_adornerPos = tempAdornerPos;
}
// Fixed the flickering adorner - Size changes to zero 'randomly'...?
if (DragAdorner.RenderSize.Width > 0 && DragAdorner.RenderSize.Height > 0)
{
_adornerSize = DragAdorner.RenderSize;
}
if (m_DragInfo != null)
{
// move the adorner
var offsetX = _adornerSize.Width * -GetDragMouseAnchorPoint(m_DragInfo.VisualSource).X;
var offsetY = _adornerSize.Height * -GetDragMouseAnchorPoint(m_DragInfo.VisualSource).Y;
_adornerPos.Offset(offsetX, offsetY);
var maxAdornerPosX = DragAdorner.AdornedElement.RenderSize.Width;
var adornerPosRightX = (_adornerPos.X + _adornerSize.Width);
if (adornerPosRightX > maxAdornerPosX)
{
_adornerPos.Offset(-adornerPosRightX + maxAdornerPosX, 0);
}
if (_adornerPos.Y < 0)
{
_adornerPos.Y = 0;
}
}
DragAdorner.MousePosition = _adornerPos;
DragAdorner.InvalidateVisual();
}
// If the target is an ItemsControl then update the drop target adorner.
if (itemsControl != null)
{
// Display the adorner in the control's ItemsPresenter. If there is no
// ItemsPresenter provided by the style, try getting hold of a
// ScrollContentPresenter and using that.
var adornedElement =
itemsControl is TabControl
? itemsControl.GetVisualDescendent <TabPanel>()
: (itemsControl.GetVisualDescendent <ItemsPresenter>() ?? itemsControl.GetVisualDescendent <ScrollContentPresenter>() as UIElement ?? itemsControl);
if (adornedElement != null)
{
if (dropInfo.DropTargetAdorner == null)
{
DropTargetAdorner = null;
}
else if (!dropInfo.DropTargetAdorner.IsInstanceOfType(DropTargetAdorner))
{
DropTargetAdorner = DropTargetAdorner.Create(dropInfo.DropTargetAdorner, adornedElement);
}
if (DropTargetAdorner != null)
{
DropTargetAdorner.DropInfo = dropInfo;
DropTargetAdorner.InvalidateVisual();
}
}
}
// Set the drag effect adorner if there is one
if (m_DragInfo != null && (EffectAdorner == null || EffectAdorner.Effects != dropInfo.Effects))
{
CreateEffectAdorner(dropInfo);
}
if (EffectAdorner != null)
{
var adornerPos = e.GetPosition(EffectAdorner.AdornedElement);
adornerPos.Offset(20, 20);
EffectAdorner.MousePosition = adornerPos;
EffectAdorner.InvalidateVisual();
}
e.Effects = dropInfo.Effects;
e.Handled = !dropInfo.NotHandled;
if (!dropInfo.IsSameDragDropContextAsSource)
{
e.Effects = DragDropEffects.None;
}
Scroll(dropInfo.VisualTarget, e);
}
private static void CreateDragAdorner(DropInfo dropInfo)
{
var template = GetDragAdornerTemplate(m_DragInfo.VisualSource);
var templateSelector = GetDragAdornerTemplateSelector(m_DragInfo.VisualSource);
UIElement adornment = null;
var useDefaultDragAdorner = GetUseDefaultDragAdorner(m_DragInfo.VisualSource);
var useVisualSourceItemSizeForDragAdorner = GetUseVisualSourceItemSizeForDragAdorner(m_DragInfo.VisualSource);
if (template == null && templateSelector == null && useDefaultDragAdorner)
{
var bs = CaptureScreen(m_DragInfo.VisualSourceItem, m_DragInfo.VisualSourceFlowDirection);
if (bs != null)
{
var factory = new FrameworkElementFactory(typeof(Image));
factory.SetValue(Image.SourceProperty, bs);
factory.SetValue(RenderOptions.EdgeModeProperty, EdgeMode.Aliased);
factory.SetValue(RenderOptions.BitmapScalingModeProperty, BitmapScalingMode.HighQuality);
factory.SetValue(FrameworkElement.WidthProperty, bs.Width);
factory.SetValue(FrameworkElement.HeightProperty, bs.Height);
factory.SetValue(FrameworkElement.HorizontalAlignmentProperty, HorizontalAlignment.Left);
factory.SetValue(FrameworkElement.VerticalAlignmentProperty, VerticalAlignment.Top);
template = new DataTemplate {
VisualTree = factory
};
}
}
if (template != null || templateSelector != null)
{
if (m_DragInfo.Data is IEnumerable && !(m_DragInfo.Data is string))
{
if (!useDefaultDragAdorner && ((IEnumerable)m_DragInfo.Data).Cast <object>().Count() <= 10)
{
var itemsControl = new ItemsControl();
itemsControl.ItemsSource = (IEnumerable)m_DragInfo.Data;
itemsControl.ItemTemplate = template;
itemsControl.ItemTemplateSelector = templateSelector;
if (useVisualSourceItemSizeForDragAdorner)
{
var bounds = VisualTreeHelper.GetDescendantBounds(m_DragInfo.VisualSourceItem);
itemsControl.SetValue(FrameworkElement.MinWidthProperty, bounds.Width);
}
// The ItemsControl doesn't display unless we create a grid to contain it.
// Not quite sure why we need this...
var grid = new Grid();
grid.Children.Add(itemsControl);
adornment = grid;
}
}
else
{
var contentPresenter = new ContentPresenter();
contentPresenter.Content = m_DragInfo.Data;
contentPresenter.ContentTemplate = template;
contentPresenter.ContentTemplateSelector = templateSelector;
if (useVisualSourceItemSizeForDragAdorner)
{
var bounds = VisualTreeHelper.GetDescendantBounds(m_DragInfo.VisualSourceItem);
contentPresenter.SetValue(FrameworkElement.MinWidthProperty, bounds.Width);
contentPresenter.SetValue(FrameworkElement.MinHeightProperty, bounds.Height);
}
adornment = contentPresenter;
}
}
if (adornment != null)
{
if (useDefaultDragAdorner)
{
adornment.Opacity = GetDefaultDragAdornerOpacity(m_DragInfo.VisualSource);
}
var rootElement = RootElementFinder.FindRoot(dropInfo.VisualTarget ?? m_DragInfo.VisualSource);
DragAdorner = new DragAdorner(rootElement, adornment);
}
}
private static void DropTarget_PreviewDrop(object sender, DragEventArgs e)
{
var dropInfo = new DropInfo(sender, e, m_DragInfo);
var dropHandler = GetDropHandler((UIElement)sender) ?? DefaultDropHandler;
var dragHandler = TryGetDragHandler(m_DragInfo, sender as UIElement);
DragAdorner = null;
EffectAdorner = null;
DropTargetAdorner = null;
dropHandler.Drop(dropInfo);
dragHandler.Dropped(dropInfo);
Mouse.OverrideCursor = null;
e.Handled = true;
}
private static void DropTarget_PreviewDragLeave(object sender, DragEventArgs e)
{
DragAdorner = null;
EffectAdorner = null;
DropTargetAdorner = null;
Mouse.OverrideCursor = null;
}
private static void DragSource_QueryContinueDrag(object sender, QueryContinueDragEventArgs e)
{
if (e.Action == DragAction.Cancel || e.EscapePressed) {
DragAdorner = null;
EffectAdorner = null;
DropTargetAdorner = null;
}
}
private static void CreateEffectAdorner(DropInfo dropInfo)
{
var template = GetEffectAdornerTemplate(m_DragInfo.VisualSource, dropInfo.Effects, dropInfo.DestinationText);
if (template != null) {
var rootElement = (UIElement)Application.Current.MainWindow.Content;
UIElement adornment = null;
var contentPresenter = new ContentPresenter();
contentPresenter.Content = m_DragInfo.Data;
contentPresenter.ContentTemplate = template;
adornment = contentPresenter;
EffectAdorner = new DragAdorner(rootElement, adornment);
}
}
private static void CreateDragAdorner()
{
var template = GetDragAdornerTemplate(m_DragInfo.VisualSource);
UIElement adornment = null;
var useDefaultDragAdorner = GetUseDefaultDragAdorner(m_DragInfo.VisualSource);
if (template == null && useDefaultDragAdorner) {
template = new DataTemplate();
var factory = new FrameworkElementFactory(typeof(Image));
var bs = CaptureScreen(m_DragInfo.VisualSourceItem, m_DragInfo.VisualSourceFlowDirection);
factory.SetValue(Image.SourceProperty, bs);
factory.SetValue(RenderOptions.EdgeModeProperty, EdgeMode.Aliased);
factory.SetValue(RenderOptions.BitmapScalingModeProperty, BitmapScalingMode.HighQuality);
if (m_DragInfo.VisualSourceItem is FrameworkElement) {
factory.SetValue(FrameworkElement.WidthProperty, ((FrameworkElement)m_DragInfo.VisualSourceItem).ActualWidth);
factory.SetValue(FrameworkElement.HeightProperty, ((FrameworkElement)m_DragInfo.VisualSourceItem).ActualHeight);
factory.SetValue(FrameworkElement.HorizontalAlignmentProperty, HorizontalAlignment.Left);
factory.SetValue(FrameworkElement.VerticalAlignmentProperty, VerticalAlignment.Top);
}
template.VisualTree = factory;
}
if (template != null) {
if (m_DragInfo.Data is IEnumerable && !(m_DragInfo.Data is string)) {
if (((IEnumerable)m_DragInfo.Data).Cast<object>().Count() <= 10) {
var itemsControl = new ItemsControl();
itemsControl.ItemsSource = (IEnumerable)m_DragInfo.Data;
itemsControl.ItemTemplate = template;
// The ItemsControl doesn't display unless we create a border to contain it.
// Not quite sure why this is...
var border = new Border();
border.Child = itemsControl;
adornment = border;
}
} else {
var contentPresenter = new ContentPresenter();
contentPresenter.Content = m_DragInfo.Data;
contentPresenter.ContentTemplate = template;
adornment = contentPresenter;
}
}
if (adornment != null) {
if (useDefaultDragAdorner) {
adornment.Opacity = GetDefaultDragAdornerOpacity(m_DragInfo.VisualSource);
}
var parentWindow = m_DragInfo.VisualSource.GetVisualAncestor<Window>();
var rootElement = parentWindow != null ? parentWindow.Content as UIElement : null;
if (rootElement == null && Application.Current != null && Application.Current.MainWindow != null) {
rootElement = (UIElement)Application.Current.MainWindow.Content;
}
// i don't want the fu... windows forms reference
// if (rootElement == null) {
// var elementHost = m_DragInfo.VisualSource.GetVisualAncestor<ElementHost>();
// rootElement = elementHost != null ? elementHost.Child : null;
// }
if (rootElement == null) {
rootElement = m_DragInfo.VisualSource.GetVisualAncestor<UserControl>();
}
DragAdorner = new DragAdorner(rootElement, adornment);
}
}
private static void DropTargetOnDragOver(object sender, DragEventArgs e, EventType eventType)
{
var elementPosition = e.GetPosition((IInputElement)sender);
var dragInfo = m_DragInfo;
var dropInfo = new DropInfo(sender, e, dragInfo, eventType);
var dropHandler = TryGetDropHandler(dropInfo, sender as UIElement);
var itemsControl = dropInfo.VisualTarget;
dropHandler.DragOver(dropInfo);
if (DragAdorner == null && dragInfo != null)
{
CreateDragAdorner(dropInfo);
}
DragAdorner?.Move(e.GetPosition(DragAdorner.AdornedElement), dragInfo != null ? GetDragMouseAnchorPoint(dragInfo.VisualSource) : default(Point), ref _adornerMousePosition, ref _adornerSize);
Scroll(dropInfo, e);
if (HitTestUtilities.HitTest4Type <ScrollBar>(sender, elementPosition) ||
HitTestUtilities.HitTest4GridViewColumnHeader(sender, elementPosition) ||
HitTestUtilities.HitTest4DataGridTypesOnDragOver(sender, elementPosition))
{
e.Effects = DragDropEffects.None;
e.Handled = true;
return;
}
// If the target is an ItemsControl then update the drop target adorner.
if (itemsControl != null)
{
// Display the adorner in the control's ItemsPresenter. If there is no
// ItemsPresenter provided by the style, try getting hold of a
// ScrollContentPresenter and using that.
UIElement adornedElement = null;
if (itemsControl is TabControl)
{
adornedElement = itemsControl.GetVisualDescendent <TabPanel>();
}
else if (itemsControl is DataGrid || (itemsControl as ListView)?.View is GridView)
{
adornedElement = itemsControl.GetVisualDescendent <ScrollContentPresenter>() as UIElement ?? itemsControl.GetVisualDescendent <ItemsPresenter>() as UIElement ?? itemsControl;
}
else
{
adornedElement = itemsControl.GetVisualDescendent <ItemsPresenter>() as UIElement ?? itemsControl.GetVisualDescendent <ScrollContentPresenter>() as UIElement ?? itemsControl;
}
if (adornedElement != null)
{
if (dropInfo.DropTargetAdorner == null)
{
DropTargetAdorner = null;
}
else if (!dropInfo.DropTargetAdorner.IsInstanceOfType(DropTargetAdorner))
{
DropTargetAdorner = DropTargetAdorner.Create(dropInfo.DropTargetAdorner, adornedElement, dropInfo);
}
var adorner = DropTargetAdorner;
if (adorner != null)
{
var adornerBrush = GetDropTargetAdornerBrush(dropInfo.VisualTarget);
if (adornerBrush != null)
{
adorner.Pen.SetCurrentValue(Pen.BrushProperty, adornerBrush);
}
adorner.DropInfo = dropInfo;
adorner.InvalidateVisual();
}
}
}
// Set the drag effect adorner if there is one
if (dragInfo != null && (EffectAdorner == null || EffectAdorner.Effects != dropInfo.Effects))
{
CreateEffectAdorner(dropInfo);
}
EffectAdorner?.Move(e.GetPosition(EffectAdorner.AdornedElement), default(Point), ref _effectAdornerMousePosition, ref _effectAdornerSize);
e.Effects = dropInfo.Effects;
e.Handled = !dropInfo.NotHandled;
if (!dropInfo.IsSameDragDropContextAsSource)
{
e.Effects = DragDropEffects.None;
}
}
private static void CreateDragAdorner(DropInfo dropInfo)
{
var dragInfo = dropInfo.DragInfo;
var template = GetDropAdornerTemplate(dropInfo.VisualTarget) ?? GetDragAdornerTemplate(dragInfo.VisualSource);
var templateSelector = GetDropAdornerTemplateSelector(dropInfo.VisualTarget) ?? GetDragAdornerTemplateSelector(dragInfo.VisualSource);
UIElement adornment = null;
var useDefaultDragAdorner = template == null && templateSelector == null && GetUseDefaultDragAdorner(dragInfo.VisualSource);
var useVisualSourceItemSizeForDragAdorner = GetUseVisualSourceItemSizeForDragAdorner(dragInfo.VisualSource);
if (useDefaultDragAdorner)
{
template = dragInfo.VisualSourceItem.GetCaptureScreenDataTemplate(dragInfo.VisualSourceFlowDirection);
}
if (template != null || templateSelector != null)
{
if (dragInfo.Data is IEnumerable && !(dragInfo.Data is string))
{
if (!useDefaultDragAdorner && ((IEnumerable)dragInfo.Data).Cast <object>().Count() <= 10)
{
var itemsControl = new ItemsControl();
itemsControl.ItemsSource = (IEnumerable)dragInfo.Data;
itemsControl.ItemTemplate = template;
itemsControl.ItemTemplateSelector = templateSelector;
itemsControl.Tag = dragInfo;
if (useVisualSourceItemSizeForDragAdorner)
{
var bounds = VisualTreeHelper.GetDescendantBounds(dragInfo.VisualSourceItem);
itemsControl.SetValue(FrameworkElement.MinWidthProperty, bounds.Width);
}
// The ItemsControl doesn't display unless we create a grid to contain it.
// Not quite sure why we need this...
var grid = new Grid();
grid.Children.Add(itemsControl);
adornment = grid;
}
}
else
{
var contentPresenter = new ContentPresenter();
contentPresenter.Content = dragInfo.Data;
contentPresenter.ContentTemplate = template;
contentPresenter.ContentTemplateSelector = templateSelector;
contentPresenter.Tag = dragInfo;
if (useVisualSourceItemSizeForDragAdorner)
{
var bounds = VisualTreeHelper.GetDescendantBounds(dragInfo.VisualSourceItem);
contentPresenter.SetValue(FrameworkElement.MinWidthProperty, bounds.Width);
contentPresenter.SetValue(FrameworkElement.MinHeightProperty, bounds.Height);
}
adornment = contentPresenter;
}
}
if (adornment != null)
{
if (useDefaultDragAdorner)
{
adornment.Opacity = GetDefaultDragAdornerOpacity(dragInfo.VisualSource);
}
var rootElement = RootElementFinder.FindRoot(dropInfo.VisualTarget ?? dragInfo.VisualSource);
DragAdorner = new DragAdorner(rootElement, adornment, GetDragAdornerTranslation(dragInfo.VisualSource));
}
}
private static void CreateDragAdorner()
{
var template = GetDragAdornerTemplate(m_DragInfo.VisualSource);
var templateSelector = GetDragAdornerTemplateSelector(m_DragInfo.VisualSource);
UIElement adornment = null;
var useDefaultDragAdorner = GetUseDefaultDragAdorner(m_DragInfo.VisualSource);
if (template == null && templateSelector == null && useDefaultDragAdorner)
{
var bs = CaptureScreen(m_DragInfo.VisualSourceItem, m_DragInfo.VisualSourceFlowDirection);
if (bs != null)
{
var factory = new FrameworkElementFactory(typeof(Image));
factory.SetValue(Image.SourceProperty, bs);
factory.SetValue(RenderOptions.EdgeModeProperty, EdgeMode.Aliased);
factory.SetValue(RenderOptions.BitmapScalingModeProperty, BitmapScalingMode.HighQuality);
factory.SetValue(FrameworkElement.WidthProperty, bs.Width);
factory.SetValue(FrameworkElement.HeightProperty, bs.Height);
factory.SetValue(FrameworkElement.HorizontalAlignmentProperty, HorizontalAlignment.Left);
factory.SetValue(FrameworkElement.VerticalAlignmentProperty, VerticalAlignment.Top);
template = new DataTemplate {
VisualTree = factory
};
}
}
if (template != null || templateSelector != null)
{
if (m_DragInfo.Data is IEnumerable && !(m_DragInfo.Data is string))
{
if (!useDefaultDragAdorner && ((IEnumerable)m_DragInfo.Data).Cast <object>().Count() <= 10)
{
var itemsControl = new ItemsControl();
itemsControl.ItemsSource = (IEnumerable)m_DragInfo.Data;
itemsControl.ItemTemplate = template;
itemsControl.ItemTemplateSelector = templateSelector;
// The ItemsControl doesn't display unless we create a border to contain it.
// Not quite sure why this is...
var border = new Border();
border.Child = itemsControl;
adornment = border;
}
}
else
{
var contentPresenter = new ContentPresenter();
contentPresenter.Content = m_DragInfo.Data;
contentPresenter.ContentTemplate = template;
contentPresenter.ContentTemplateSelector = templateSelector;
adornment = contentPresenter;
}
}
if (adornment != null)
{
if (useDefaultDragAdorner)
{
adornment.Opacity = GetDefaultDragAdornerOpacity(m_DragInfo.VisualSource);
}
var parentWindow = m_DragInfo.VisualSource.GetVisualAncestor <Window>();
var rootElement = parentWindow != null ? parentWindow.Content as UIElement : null;
if (rootElement == null && Application.Current != null && Application.Current.MainWindow != null)
{
rootElement = (UIElement)Application.Current.MainWindow.Content;
}
// i don't want the fu... windows forms reference
// if (rootElement == null) {
// var elementHost = m_DragInfo.VisualSource.GetVisualAncestor<ElementHost>();
// rootElement = elementHost != null ? elementHost.Child : null;
// }
if (rootElement == null)
{
rootElement = m_DragInfo.VisualSource.GetVisualAncestor <UserControl>();
}
DragAdorner = new DragAdorner(rootElement, adornment);
}
}
static void CreateDragAdorner()
{
DataTemplate template = GetDragAdornerTemplate(m_DragInfo.VisualSource);
if (template != null)
{
UIElement rootElement = (UIElement)Application.Current.MainWindow.Content;
UIElement adornment = null;
if (m_DragInfo.Data is IEnumerable && !(m_DragInfo.Data is string))
{
if (((IEnumerable)m_DragInfo.Data).Cast<object>().Count() <= 10)
{
ItemsControl itemsControl = new ItemsControl();
itemsControl.ItemsSource = (IEnumerable)m_DragInfo.Data;
itemsControl.ItemTemplate = template;
// The ItemsControl doesn't display unless we create a border to contain it.
// Not quite sure why this is...
Border border = new Border();
border.Child = itemsControl;
adornment = border;
}
}
else
{
ContentPresenter contentPresenter = new ContentPresenter();
contentPresenter.Content = m_DragInfo.Data;
contentPresenter.ContentTemplate = template;
adornment = contentPresenter;
}
if (adornment != null)
{
adornment.Opacity = 0.5;
DragAdorner = new DragAdorner(rootElement, adornment);
}
}
}
private static void CreateEffectAdorner(DropInfo dropInfo)
{
var template = GetEffectAdornerTemplate(m_DragInfo.VisualSource, dropInfo.Effects, dropInfo.DestinationText);
if (template != null) {
var rootElement = RootElementFinder.FindRoot(m_DragInfo.VisualSource);
UIElement adornment = null;
var contentPresenter = new ContentPresenter();
contentPresenter.Content = m_DragInfo.Data;
contentPresenter.ContentTemplate = template;
adornment = contentPresenter;
EffectAdorner = new DragAdorner(rootElement, adornment, dropInfo.Effects);
}
}
private static void CreateDragAdorner(DropInfo dropInfo)
{
var template = GetDragAdornerTemplate(m_DragInfo.VisualSource);
var templateSelector = GetDragAdornerTemplateSelector(m_DragInfo.VisualSource);
UIElement adornment = null;
var useDefaultDragAdorner = GetUseDefaultDragAdorner(m_DragInfo.VisualSource);
var useVisualSourceItemSizeForDragAdorner = GetUseVisualSourceItemSizeForDragAdorner(m_DragInfo.VisualSource);
if (template == null && templateSelector == null && useDefaultDragAdorner) {
var bs = CaptureScreen(m_DragInfo.VisualSourceItem, m_DragInfo.VisualSourceFlowDirection);
if (bs != null) {
var factory = new FrameworkElementFactory(typeof(Image));
factory.SetValue(Image.SourceProperty, bs);
factory.SetValue(RenderOptions.EdgeModeProperty, EdgeMode.Aliased);
factory.SetValue(RenderOptions.BitmapScalingModeProperty, BitmapScalingMode.HighQuality);
factory.SetValue(FrameworkElement.WidthProperty, bs.Width);
factory.SetValue(FrameworkElement.HeightProperty, bs.Height);
factory.SetValue(FrameworkElement.HorizontalAlignmentProperty, HorizontalAlignment.Left);
factory.SetValue(FrameworkElement.VerticalAlignmentProperty, VerticalAlignment.Top);
template = new DataTemplate { VisualTree = factory };
}
}
if (template != null || templateSelector != null) {
if (m_DragInfo.Data is IEnumerable && !(m_DragInfo.Data is string)) {
if (!useDefaultDragAdorner && ((IEnumerable)m_DragInfo.Data).Cast<object>().Count() <= 10) {
var itemsControl = new ItemsControl();
itemsControl.ItemsSource = (IEnumerable)m_DragInfo.Data;
itemsControl.ItemTemplate = template;
itemsControl.ItemTemplateSelector = templateSelector;
if (useVisualSourceItemSizeForDragAdorner)
{
var bounds = VisualTreeHelper.GetDescendantBounds(m_DragInfo.VisualSourceItem);
itemsControl.SetValue(FrameworkElement.MinWidthProperty, bounds.Width);
}
// The ItemsControl doesn't display unless we create a grid to contain it.
// Not quite sure why we need this...
var grid = new Grid();
grid.Children.Add(itemsControl);
adornment = grid;
}
} else {
var contentPresenter = new ContentPresenter();
contentPresenter.Content = m_DragInfo.Data;
contentPresenter.ContentTemplate = template;
contentPresenter.ContentTemplateSelector = templateSelector;
if (useVisualSourceItemSizeForDragAdorner)
{
var bounds = VisualTreeHelper.GetDescendantBounds(m_DragInfo.VisualSourceItem);
contentPresenter.SetValue(FrameworkElement.MinWidthProperty, bounds.Width);
contentPresenter.SetValue(FrameworkElement.MinHeightProperty, bounds.Height);
}
adornment = contentPresenter;
}
}
if (adornment != null) {
if (useDefaultDragAdorner) {
adornment.Opacity = GetDefaultDragAdornerOpacity(m_DragInfo.VisualSource);
}
var rootElement = RootElementFinder.FindRoot(dropInfo.VisualTarget ?? m_DragInfo.VisualSource);
DragAdorner = new DragAdorner(rootElement, adornment);
}
}
static void DropTarget_PreviewDragOver(object sender, DragEventArgs e)
{
DropInfo dropInfo = new DropInfo(sender, e, m_DragInfo);
IDropTarget dropHandler = GetDropHandler((UIElement)sender);
double adornerOpacity = GetAdornerOpacity((UIElement)sender);
ItemsControl itemsControl = sender as ItemsControl;
if (dropHandler != null)
{
dropHandler.DragOver(dropInfo);
}
else
{
DefaultDropHandler.DragOver(dropInfo);
}
// Update the drag adorner.
//if (dropInfo.Effects != DragDropEffects.None)
//{
// if (DragAdorner == null && m_DragInfo != null)
// {
// CreateDragAdorner();
// }
// if (DragAdorner != null)
// {
// DragAdorner.MousePosition = e.GetPosition(DragAdorner.AdornedElement);
// DragAdorner.InvalidateVisual();
// }
//}
//else
//{
// DragAdorner = null;
//}
if (DragAdorner == null && m_DragInfo != null)
{
CreateDragAdorner(adornerOpacity);
}
if (DragAdorner != null)
{
DragAdorner.MousePosition = e.GetPosition(DragAdorner.AdornedElement);
DragAdorner.InvalidateVisual();
}
// If the target is an ItemsControl then update the drop target adorner.
if (itemsControl != null)
{
// Display the adorner in the control's ItemsPresenter. If there is no
// ItemsPresenter provided by the style, try getting hold of a
// ScrollContentPresenter and using that.
UIElement adornedElement =
(UIElement)itemsControl.GetVisualDescendent <ItemsPresenter>() ??
(UIElement)itemsControl.GetVisualDescendent <ScrollContentPresenter>();
if (adornedElement != null)
{
if (dropInfo.DropTargetAdorner == null)
{
DropTargetAdorner = null;
}
else if (!dropInfo.DropTargetAdorner.IsInstanceOfType(DropTargetAdorner))
{
DropTargetAdorner = DropTargetAdorner.Create(dropInfo.DropTargetAdorner, adornedElement);
}
if (DropTargetAdorner != null)
{
DropTargetAdorner.DropInfo = dropInfo;
DropTargetAdorner.InvalidateVisual();
}
}
}
e.Effects = dropInfo.Effects;
e.Handled = true;
Scroll((DependencyObject)sender, e);
}
