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PODrag'n Drop Problems with extended glass border
 

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  1. PODrag'n Drop Problems with extended glass border
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    <p>I'm playing around with the glass border in WPF and I've found a problem. When I extend the glass border of a window, the drag and drop functions won't work anymore... for example dragging a GridSplitter around ends with an exception.</p> <p>The XAML of my MainWindow:</p> <pre><code>&lt;Window x:Class="ChromeDragDrop.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:shell="clr-namespace:Microsoft.Windows.Shell;assembly=Microsoft.Windows.Shell" xmlns:local="clr-namespace:ChromeDragDrop" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.Resources&gt; &lt;Style TargetType="{x:Type local:MainWindow}"&gt; &lt;Setter Property="shell:WindowChrome.WindowChrome"&gt; &lt;Setter.Value&gt; &lt;shell:WindowChrome GlassFrameThickness="-1" ResizeBorderThickness="4" CaptionHeight="36"/&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type local:MainWindow}"&gt; &lt;ContentPresenter Content="{TemplateBinding Content}"&gt;&lt;/ContentPresenter&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;Grid Margin="50"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="*"&gt;&lt;/RowDefinition&gt; &lt;RowDefinition Height="*"&gt;&lt;/RowDefinition&gt; &lt;/Grid.RowDefinitions&gt; &lt;Border Background="Lime" Opacity="0.8"&gt;&lt;/Border&gt; &lt;Border Background="Gray" Opacity="0.8" Grid.Row="1"&gt;&lt;/Border&gt; &lt;GridSplitter Background="Red" Height="10" ShowsPreview="True" ResizeDirection="Rows" HorizontalAlignment="Stretch" Grid.Row="1" VerticalAlignment="Top"&gt;&lt;/GridSplitter&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>The Exception:</p> <pre><code>System.NullReferenceException was unhandled Message=Object reference not set to an instance of an object. Source=PresentationFramework StackTrace: at System.Windows.Controls.GridSplitter.OnDragDelta(DragDeltaEventArgs e) at System.Windows.Controls.GridSplitter.OnDragDelta(Object sender, DragDeltaEventArgs e) at System.Windows.Controls.Primitives.DragDeltaEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e) at System.Windows.Controls.Primitives.Thumb.OnMouseMove(MouseEventArgs e) at System.Windows.UIElement.OnMouseMoveThunk(Object sender, MouseEventArgs e) at System.Windows.Input.MouseEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args) at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted) at System.Windows.Input.InputManager.ProcessStagingArea() at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input) at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport) at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel) at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG&amp; msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at ChromeDragDrop.App.Main() in C:\Project\CSharp\Learn\WPF\ChromeGlass\ChromeDragDrop\ChromeDragDrop\obj\x86\Debug\App.g.cs:line 0 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: </code></pre> <p>What can I do to solve this problem?</p>
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