private static void OnBusyStateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var isBusy = (bool) e.NewValue;
var wasBusy = (bool) e.OldValue;
if (isBusy == wasBusy)
{
return;
}
var hostGridObject = (GetTargetVisual(d) ?? d);
Debug.Assert(hostGridObject != null);
var hostGrid = hostGridObject as Grid;
if (hostGrid == null)
{
throw new InvalidCastException(
string.Format(
"The object being attached to must be of type {0}. Try embedding your visual inside a {0} control, and attaching the behavior to the {0} instead.",
typeof(Grid).Name));
}
if (isBusy)
{
Debug.Assert(LogicalTreeHelper.FindLogicalNode(hostGrid, "BusyIndicator") == null);
var dimBackground = GetDimBackground(d);
var grid = new Grid
{
Name = "BusyIndicator",
Opacity = 0.0
};
if (dimBackground)
{
grid.Cursor = Cursors.Wait;
grid.ForceCursor = true;
InputManager.Current.PreProcessInput += OnPreProcessInput;
}
grid.SetBinding(FrameworkElement.WidthProperty, new Binding("ActualWidth")
{
Source = hostGrid
});
grid.SetBinding(FrameworkElement.HeightProperty, new Binding("ActualHeight")
{
Source = hostGrid
});
for (var i = 1; i <= 3; ++i)
{
grid.ColumnDefinitions.Add(new ColumnDefinition
{
Width = new GridLength(1, GridUnitType.Star)
});
grid.RowDefinitions.Add(new RowDefinition
{
Height = new GridLength(1, GridUnitType.Star)
});
}
var viewbox = new Viewbox
{
HorizontalAlignment = HorizontalAlignment.Center,
Stretch = Stretch.Uniform,
StretchDirection = StretchDirection.Both,
Child = new CircularProgressBar()
};
grid.SetCurrentValue(Panel.ZIndexProperty, 1000);
grid.SetCurrentValue(Grid.RowSpanProperty, Math.Max(1, hostGrid.RowDefinitions.Count));
grid.SetCurrentValue(Grid.ColumnSpanProperty, Math.Max(1, hostGrid.ColumnDefinitions.Count));
if (GetAddMargins(d))
{
viewbox.SetCurrentValue(Grid.RowProperty, 1);
viewbox.SetCurrentValue(Grid.ColumnProperty, 1);
}
else
{
viewbox.SetCurrentValue(Grid.RowSpanProperty, 3);
viewbox.SetCurrentValue(Grid.ColumnSpanProperty, 3);
}
viewbox.SetCurrentValue(Panel.ZIndexProperty, 1);
var dimmer = new Rectangle
{
Name = "Dimmer",
Opacity = GetDimmerOpacity(d),
Fill = GetDimmerBrush(d),
Visibility = (dimBackground ? Visibility.Visible : Visibility.Collapsed)
};
dimmer.SetCurrentValue(Grid.RowSpanProperty, 3);
dimmer.SetCurrentValue(Grid.ColumnSpanProperty, 3);
dimmer.SetCurrentValue(Panel.ZIndexProperty, 0);
grid.Children.Add(dimmer);
grid.Children.Add(viewbox);
grid.BeginAnimation(UIElement.OpacityProperty, new DoubleAnimation(1.0, GetDimTransitionDuration(d)));
hostGrid.Children.Add(grid);
}
else
{
var grid = (Grid) LogicalTreeHelper.FindLogicalNode(hostGrid, "BusyIndicator");
Debug.Assert(grid != null);
grid.Name = string.Empty;
var fadeOutAnimation = new DoubleAnimation(0.0, GetDimTransitionDuration(d));
fadeOutAnimation.Completed += (sender, args) => OnFadeOutAnimationCompleted(d, hostGrid, grid);
grid.BeginAnimation(UIElement.OpacityProperty, fadeOutAnimation);
}
}