/// <summary>
/// 为某个数据加载器建立一个 BusyControl。
/// 用于在数据加载的时候，显示一个不停转动的 Busy 控件。
/// </summary>
/// <param name="viewController"></param>
/// <returns></returns>
internal static FrameworkElement CreateBusyControl(ViewDataLoader viewController)
{
//生成busy控件
var busy = new BusyAnimation();
//绑定TextBox到对象属性
var bdIsRunning = new Binding("IsBusy");
bdIsRunning.Source = viewController.DataProvider;
bdIsRunning.BindsDirectlyToSource = true;
busy.SetBinding(BusyAnimation.IsRunningProperty, bdIsRunning);
//绑定IsVisible
var bdIsVisible = new Binding("IsBusy");
bdIsVisible.Source = viewController.DataProvider;
bdIsVisible.BindsDirectlyToSource = true;
bdIsVisible.Converter = new BooleanToVisibilityConverter();
busy.SetBinding(BusyAnimation.VisibilityProperty, bdIsVisible);
return(busy);
}
private void ViewLoaded(object sender, RoutedEventArgs e)
{
if (DataContext is IRolodexViewModel)
{
var model = DataContext as IRolodexViewModel;
Grid root = null;
if (Content is Grid)
{
root = Content as Grid;
}
else if (Content is Border)
{
if ((Content as Border).Child is Grid)
{
root = (Content as Border).Child as Grid;
}
}
if (root != null)
{
if (root.Background == null)
{
root.Background = new SolidColorBrush(Colors.LightGray);
}
var curtainGrid = new Grid();
curtainGrid.SetValue(Canvas.ZIndexProperty, 9999);
curtainGrid.Opacity = 0.6;
curtainGrid.SetValue(Grid.RowSpanProperty, root.RowDefinitions.Count + 1);
curtainGrid.SetValue(Grid.ColumnSpanProperty, root.ColumnDefinitions.Count + 1);
var brush = new LinearGradientBrush {
EndPoint = new Point(0.5, 1), StartPoint = new Point(0.5, 0)
};
var stops = new GradientStopCollection();
var stop = new GradientStop {
Color = new Color {
R = 0x80, G = 0x74, B = 0xD4
}
};
stops.Add(stop);
stop = new GradientStop {
Color = new Color {
R = 0x80, G = 0x74, B = 0xD4
}, Offset = 1
};
stops.Add(stop);
stop = new GradientStop {
Color = new Color {
R = 0xB7, G = 0x84, B = 0xD0
}, Offset = 0.5
};
stops.Add(stop);
brush.GradientStops = stops;
curtainGrid.Background = brush;
var busyAnimation = new BusyAnimation
{
MinHeight = 48,
MinWidth = 48,
MaxHeight = 300,
MaxWidth = 300,
TabNavigation = System.Windows.Input.KeyboardNavigationMode.Cycle
};
var binding = new Binding("IsBusy");
busyAnimation.HorizontalAlignment = HorizontalAlignment.Stretch;
busyAnimation.VerticalAlignment = VerticalAlignment.Stretch;
busyAnimation.SetBinding(BusyAnimation.IsRunningProperty, binding);
curtainGrid.Children.Add(busyAnimation);
binding = new Binding("IsBusy")
{
Converter = new BooleanToVisibilityConverter()
};
curtainGrid.SetBinding(VisibilityProperty, binding);
root.Children.Add(curtainGrid);
if (model.IsBusy)
{
Dispatcher.BeginInvoke(() => busyAnimation.Focus());
}
model.PropertyChanged += (o1, e1) =>
{
if (e1.PropertyName == "IsBusy")
{
if (model.IsBusy)
{
busyAnimation.Focus();
}
else
{
Focus();
}
}
};
Loaded -= ViewLoaded;
}
}
}
