private static void TabControl_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
TabControl sourceTabControl = (TabControl)sender;
sourceTabControl.PreviewMouseLeftButtonUp -= TabTearOffBehavior.TabControl_PreviewMouseLeftButtonUp;
sourceTabControl.PreviewMouseMove -= TabTearOffBehavior.TabControl_PreviewMouseMove;
sourceTabControl.MouseLeave -= TabTearOffBehavior.TabControl_MouseLeaveOrLostCapture;
sourceTabControl.LostMouseCapture -= TabTearOffBehavior.TabControl_MouseLeaveOrLostCapture;
if (sourceTabControl.IsMouseCaptured)
{
TabItem tabItem = TabTearOffBehavior._activeTabItem;
Point dragWindowLocation = new Point
{
X = TabTearOffBehavior._dragWindow.Left,
Y = TabTearOffBehavior._dragWindow.Top
};
sourceTabControl.ReleaseMouseCapture();
if (TabTearOffBehavior._adorner != null)
{
TabTearOffBehavior._adorner.Detach();
TabTearOffBehavior._adorner = null;
}
TabTearOffBehavior._dragWindow.Close();
TabTearOffBehavior._dragWindow = null;
TabTearOffBehavior._activeTabItem = null;
object item = sourceTabControl.ItemContainerGenerator.ItemFromContainer(tabItem);
int sourceIndex = sourceTabControl.ItemContainerGenerator.IndexFromContainer(tabItem);
Window dropWindow = TabTearOffBehavior.GetWindowMouseIsOver(e);
TabControl targetTabControl;
Panel targetPanel;
ITabTearOffHandler targetHandler;
if (dropWindow != null &&
TabTearOffBehavior.IsMouseInDropLocation(e, targetTabControl = TabTearOffBehavior.FindTargetTabControl(dropWindow, out targetHandler), targetPanel = ControlMethods.GetPanel(targetTabControl)))
{
int insertionIndex = TabTearOffBehavior.DetermineInsertionIndex(targetTabControl, e, targetPanel.GetOrientation());
if (!object.ReferenceEquals(sourceTabControl, targetTabControl))
{
if (targetHandler.AllowTargetedDrop(item, sourceTabControl, sourceIndex, targetTabControl, insertionIndex))
{
targetHandler.HandleTargetedDrop(item, sourceTabControl, sourceIndex, targetTabControl, insertionIndex);
}
}
else if (sourceTabControl.Items.Count != 1 &&
insertionIndex != sourceIndex &&
targetHandler.AllowReorder(item, sourceTabControl, sourceIndex, insertionIndex))
{
targetHandler.HandleReorder(item, sourceTabControl, sourceIndex, insertionIndex);
}
}
else
{
ITabTearOffHandler sourceHandler = TabTearOffBehavior.GetHandler(sourceTabControl);
if (sourceHandler.AllowTargetlessDrop(item, sourceTabControl, sourceIndex, dragWindowLocation))
{
sourceHandler.HandleTargetlessDrop(item, sourceTabControl, sourceIndex, dragWindowLocation);
}
}
}
e.Handled = true;
}
private static void TabControl_Loaded(object sender, RoutedEventArgs e)
{
TabControl tabControl = (TabControl)sender;
tabControl.Loaded -= TabTearOffBehavior.TabControl_Loaded;
TabTearOffBehavior.SetWindowMaintainZIndex(tabControl, true);
}
private static void HandlerProperty_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TabControl tabControl = d as TabControl;
if (tabControl == null)
{
return;
}
if (e.NewValue == null && e.OldValue != null)
{
WeakEventManager <TabControl, MouseButtonEventArgs> .RemoveHandler(tabControl, nameof(TabControl.PreviewMouseLeftButtonDown), TabTearOffBehavior.TabControl_PreviewMouseLeftButtonDown);
if (!tabControl.IsLoaded)
{
tabControl.Loaded -= TabTearOffBehavior.TabControl_Loaded;
}
else
{
TabTearOffBehavior.SetWindowMaintainZIndex(tabControl, false);
}
}
else if (e.NewValue != null && e.OldValue == null)
{
WeakEventManager <TabControl, MouseButtonEventArgs> .AddHandler(tabControl, nameof(TabControl.PreviewMouseLeftButtonDown), TabTearOffBehavior.TabControl_PreviewMouseLeftButtonDown);
if (!tabControl.IsLoaded)
{
tabControl.Loaded += TabTearOffBehavior.TabControl_Loaded;
}
else
{
TabTearOffBehavior.SetWindowMaintainZIndex(tabControl, true);
}
}
}
private static Window GetWindowMouseIsOver(MouseEventArgs args)
{
return(Application.Current.Windows
.Cast <Window>()
.Where(window => window.WindowState != WindowState.Minimized && TabTearOffBehavior.GetMaintainZIndex(window))
.OrderBy(TabTearOffBehavior.GetZIndex)
.FirstOrDefault(window => VisualTreeHelper.GetDescendantBounds(window).Contains(args.GetPosition(window))));
}
private static void SetWindowMaintainZIndex(DependencyObject d, bool maintainZIndex)
{
Window window = Window.GetWindow(d);
if (window == null)
{
throw new ArgumentException("TabControl is not in a window");
}
TabTearOffBehavior.SetMaintainZIndex(window, maintainZIndex);
}
public void Detach()
{
TabTearOffBehavior.SetIsDraggingOver(this.AdornedElement, false);
this.AdornedElement.Loaded -= this.AdornedElement_Loaded;
this.AdornedElement.Unloaded -= this.AdornedElement_Unloaded;
if (this._adornerLayer == null)
{
return;
}
this._adornerLayer.Remove(this);
this._adornerLayer = null;
}
private static TabControl FindTargetTabControl(Window dropWindow, out ITabTearOffHandler handler)
{
handler = null;
foreach (TabControl tabControl in dropWindow.GetVisualTreeDescendents <TabControl>())
{
if ((handler = TabTearOffBehavior.GetHandler(tabControl)) != null)
{
return(tabControl);
}
}
return(null);
}
private static void Window_Activated(object sender, EventArgs e)
{
Window window = (Window)sender;
int index = TabTearOffBehavior._windows.IndexOf(window);
if (index == 0)
{
return;
}
TabTearOffBehavior._windows.RemoveAt(index);
TabTearOffBehavior._windows.Insert(0, window);
TabTearOffBehavior.AssignZIndices();
}
protected override void OnRender(DrawingContext drawingContext)
{
int insertionIndex = TabTearOffBehavior.DetermineInsertionIndex(this.AdornedElement, this._mouseEventArgs, this._orientation);
ITabTearOffHandler handler = TabTearOffBehavior.GetHandler(this.AdornedElement);
TabControl activeTabControl = TabTearOffBehavior._activeTabItem == null ? null : (TabControl)ItemsControl.ItemsControlFromItemContainer(TabTearOffBehavior._activeTabItem);
if (activeTabControl == null ||
!this.AdornedElement.Equals(activeTabControl) && !handler.AllowTargetedDrop(activeTabControl.ItemContainerGenerator.ItemFromContainer(TabTearOffBehavior._activeTabItem), activeTabControl, activeTabControl.ItemContainerGenerator.IndexFromContainer(TabTearOffBehavior._activeTabItem), this.AdornedElement, insertionIndex) ||
this.AdornedElement.Equals(activeTabControl) && !handler.AllowReorder(activeTabControl.ItemContainerGenerator.ItemFromContainer(TabTearOffBehavior._activeTabItem), activeTabControl, activeTabControl.ItemContainerGenerator.IndexFromContainer(TabTearOffBehavior._activeTabItem), insertionIndex))
{
return;
}
int index = Math.Min(insertionIndex, this.AdornedElement.Items.Count - 1);
UIElement container;
if ((container = (UIElement)this.AdornedElement.ItemContainerGenerator.ContainerFromIndex(index)) == null)
{
return;
}
Rect itemRect = new Rect(container.TranslatePoint(default(Point), this.AdornedElement), container.RenderSize);
Point point1, point2;
double rotation;
if (this._orientation == Orientation.Vertical)
{
if (insertionIndex == this.AdornedElement.Items.Count)
{
itemRect.Y += container.RenderSize.Height;
}
point1 = new Point(itemRect.X - InsertionAdorner.Size, itemRect.Y);
point2 = new Point(itemRect.Right + InsertionAdorner.Size, itemRect.Y);
rotation = 0;
}
else
{
if (insertionIndex == this.AdornedElement.Items.Count)
{
itemRect.X += container.RenderSize.Width;
}
point1 = new Point(itemRect.X, itemRect.Y - InsertionAdorner.Size);
point2 = new Point(itemRect.X, itemRect.Bottom + InsertionAdorner.Size);
rotation = 90d;
}
InsertionAdorner.DrawArrow(drawingContext, point1, rotation);
InsertionAdorner.DrawArrow(drawingContext, point2, 180d + rotation);
}
public InsertionAdorner(TabControl adornedElement, Orientation orientation)
: base(adornedElement)
{
if (!adornedElement.IsLoaded)
{
adornedElement.Loaded += this.AdornedElement_Loaded;
}
else
{
if ((this._adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement)) != null)
{
this._adornerLayer.Add(this);
}
adornedElement.Unloaded += this.AdornedElement_Unloaded;
}
this._orientation = orientation;
TabTearOffBehavior.SetIsDraggingOver(adornedElement, true);
this.IsHitTestVisible = false;
}
/// <summary>
/// Handles the PreviewMouseLeftButtonDown event of the TabControl.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
private static void TabControl_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
TabControl tabControl = (TabControl)sender;
TabTearOffBehavior._activeTabItem = null;
TabTearOffBehavior._dragStartPosition = default(Point);
Point position = e.GetPosition(tabControl);
HitTestResult result = VisualTreeHelper.HitTest(tabControl, position);
if (result == null)
{
return;
}
TabItem tabItem = null;
for (DependencyObject obj = result.VisualHit; obj != null; obj = VisualTreeHelper.GetParent(obj))
{
ButtonBase button = obj as ButtonBase;
if (button != null)
{
return;
}
if ((tabItem = obj as TabItem) != null)
{
break;
}
}
if (tabItem == null ||
!tabControl.Equals(ItemsControl.ItemsControlFromItemContainer(tabItem)) ||
!TabTearOffBehavior.GetHandler(tabControl).IsDragAllowed(tabControl.ItemContainerGenerator.ItemFromContainer(tabItem), tabControl, tabControl.ItemContainerGenerator.IndexFromContainer(tabItem)))
{
return;
}
TabTearOffBehavior._activeTabItem = tabItem;
TabTearOffBehavior._dragStartPosition = position;
tabControl.PreviewMouseMove += TabTearOffBehavior.TabControl_PreviewMouseMove;
tabControl.PreviewMouseLeftButtonUp += TabTearOffBehavior.TabControl_PreviewMouseLeftButtonUp;
tabControl.MouseLeave += TabTearOffBehavior.TabControl_MouseLeaveOrLostCapture;
tabControl.LostMouseCapture += TabTearOffBehavior.TabControl_MouseLeaveOrLostCapture;
}
private static void MaintainZIndexProperty_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Window window = d as Window;
if (window == null)
{
return;
}
if ((bool)e.NewValue)
{
window.Activated += TabTearOffBehavior.Window_Activated;
window.Closed += TabTearOffBehavior.Window_Closed;
TabTearOffBehavior._windows.Add(window);
}
else if (TabTearOffBehavior._windows.Remove(window))
{
window.ClearValue(TabTearOffBehavior._zIndexProperty);
window.Activated -= TabTearOffBehavior.Window_Activated;
window.Closed -= TabTearOffBehavior.Window_Closed;
}
TabTearOffBehavior.AssignZIndices();
}
private static void Window_Closed(object sender, EventArgs e)
{
TabTearOffBehavior.SetMaintainZIndex((Window)sender, false);
}
private static void TabControl_PreviewMouseMove(object sender, MouseEventArgs e)
{
TabControl tabControl = (TabControl)sender;
Point point = e.GetPosition(tabControl);
if (tabControl.IsMouseCaptured)
{
TabTearOffBehavior.UpdateDragWindowLocation(tabControl);
Window dropWindow = TabTearOffBehavior.GetWindowMouseIsOver(e);
if (dropWindow == null)
{
return;
}
if (!dropWindow.IsActive)
{
dropWindow.Activate();
}
ITabTearOffHandler targetHandler;
TabControl targetTabControl = TabTearOffBehavior.FindTargetTabControl(dropWindow, out targetHandler);
Panel panel = ControlMethods.GetPanel(targetTabControl);
if (TabTearOffBehavior.IsMouseInDropLocation(e, targetTabControl, panel))
{
if (TabTearOffBehavior._adorner == null || !TabTearOffBehavior._adorner.AdornedElement.Equals(targetTabControl))
{
if (TabTearOffBehavior._adorner != null)
{
TabTearOffBehavior._adorner.Detach();
}
TabTearOffBehavior._adorner = new InsertionAdorner(targetTabControl, panel.GetOrientation());
}
TabTearOffBehavior._adorner.UpdateLocation(e);
}
else if (TabTearOffBehavior._adorner != null)
{
TabTearOffBehavior._adorner.Detach();
TabTearOffBehavior._adorner = null;
}
}
else if (TabTearOffBehavior.IsSufficientDragMove(point))
{
Rectangle contentRectangle = TabTearOffBehavior.CreateRectangle((Visual)TabTearOffBehavior.GetContent(tabControl));
Rectangle tabItemRectangle = TabTearOffBehavior.CreateRectangle(TabTearOffBehavior._activeTabItem);
Panel.SetZIndex(tabItemRectangle, 10);
StackPanel stackPanel = new StackPanel
{
Orientation = tabControl.TabStripPlacement == Dock.Right || tabControl.TabStripPlacement == Dock.Left ? Orientation.Horizontal : Orientation.Vertical,
Children =
{
tabItemRectangle
}
};
stackPanel.Children.Insert(tabControl.TabStripPlacement == Dock.Right || tabControl.TabStripPlacement == Dock.Bottom ? 0 : 1, contentRectangle);
TranslateTransform translateTransform = new TranslateTransform();
switch (tabControl.TabStripPlacement)
{
case Dock.Bottom:
translateTransform.Y = -1d;
break;
case Dock.Left:
translateTransform.X = 1d;
break;
case Dock.Right:
translateTransform.X = -1d;
break;
case Dock.Top:
translateTransform.Y = 1d;
break;
}
tabItemRectangle.RenderTransform = translateTransform;
TabTearOffBehavior._dragWindow = new Window
{
Topmost = true,
AllowsTransparency = true,
WindowStyle = WindowStyle.None,
IsHitTestVisible = false,
SizeToContent = SizeToContent.WidthAndHeight,
Background = Brushes.Transparent,
Content = new Border
{
Child = stackPanel,
Opacity = 0.75
}
};
TabTearOffBehavior.UpdateDragWindowLocation(tabControl);
TabTearOffBehavior._dragWindow.Show();
tabControl.MouseLeave -= TabTearOffBehavior.TabControl_MouseLeaveOrLostCapture;
tabControl.CaptureMouse();
e.Handled = true;
}
}