public override void OnApplyTemplate()
{
base.OnApplyTemplate();
var thumbAndSubscription = SelectAndSubscribeToThumb();
_templateSubscriptions.Disposable = thumbAndSubscription.Item2;
if (_seizeDragWithTemplate && thumbAndSubscription.Item1 != null)
{
_isTemplateThumbWithMouseAfterSeize = true;
Mouse.AddLostMouseCaptureHandler(this, LostMouseAfterSeizeHandler);
if (_dragSeizedContinuation != null)
{
_dragSeizedContinuation(this);
}
_dragSeizedContinuation = null;
Dispatcher.BeginInvoke(new Action(() => thumbAndSubscription.Item1.RaiseEvent(new MouseButtonEventArgs(InputManager.Current.PrimaryMouseDevice,
0,
MouseButton.Left)
{
RoutedEvent = MouseLeftButtonDownEvent
})));
}
_seizeDragWithTemplate = false;
}
private void PopupOpened(object sender, EventArgs e)
{
Mouse.Capture(this, CaptureMode.SubTree);
// Mouse capture can be lost on 'this' when the user clicks on the scroll bar, which can cause
// OutsideCapturedElementHandler to never be called. If we monitor the popup for lost mouse capture
// (which the popup gains on mouse down of the scroll bar), then we can recapture the mouse at that point
// to cause OutsideCapturedElementHandler to be called again.
Mouse.AddLostMouseCaptureHandler(this._popup, this.LostMouseCaptureHandler);
}
public MainWindow()
{
InitializeComponent();
_captureElement = this;
Mouse.AddGotMouseCaptureHandler((DependencyObject)_captureElement, stackPanel1_GotLostMouseCapture);
Mouse.AddLostMouseCaptureHandler((DependencyObject)_captureElement, stackPanel1_GotLostMouseCapture);
Mouse.Capture(_captureElement);
MouseCaptured = Mouse.Captured != null;
}
/// <summary>
/// Defers the specified action until the application is idle.
/// </summary>
/// <param name="dispatcher">The dispatcher.</param>
/// <param name="action">The action.</param>
public static void Defer(Dispatcher dispatcher, Action action)
{
var element = Mouse.Captured as DependencyObject;
if (element != null)
{
// Mouse interaction in progress.
// --> Run the specified action when the mouse interaction is complete.
MouseEventHandler handler = null;
handler = (sender, args) =>
{
// ReSharper disable once AssignNullToNotNullAttribute
Mouse.RemoveLostMouseCaptureHandler(element, handler);
action();
};
Mouse.AddLostMouseCaptureHandler(element, handler);
}
else
{
// Run the specified action when the application is idle.
dispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle, action);
}
}
private static void OnIsSubmenuOpenChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
SplitButton splitButton = sender as SplitButton;
if ((bool)args.NewValue)
{
openSplitButton = splitButton;
// Handle keyboard events as long as the popup is displayed
var window = Window.GetWindow(splitButton);
window.PreviewKeyDown += OnPreviewKeyDown;
if (Mouse.Captured != splitButton)
{
Mouse.Capture(splitButton, CaptureMode.SubTree);
Mouse.AddLostMouseCaptureHandler(splitButton, OnLostMouseCapture);
}
}
else
{
// Remove popup keyboard handler
var window = Window.GetWindow(splitButton);
window.PreviewKeyDown -= OnPreviewKeyDown;
openSplitButton = null;
if (Mouse.Captured == splitButton)
{
Mouse.Capture(null);
}
if (splitButton.IsKeyboardFocused)
{
splitButton.Focus();
}
}
}