【发布时间】：2015-08-06 01:17:57
【问题描述】：
好的，所以我之前收到Here 的答案真的很棒。然而，在已知问题中，它提到了以下内容：
此外，这不会立即在 UserControls 中工作，因为
AdornerLayer.GetAdornerLayer(AdornedElement)将返回null在用户控件中。这可以通过查找UserControl的父级的AdornerLayer（或 父级，递归）。周围有一些功能可以做到这一点。
所以，我在大部分情况下都在使用代码，但是当我尝试在 tabcontrol 中的元素上使用它时遇到了问题。模糊效果仅适用于 TabItem 内，而不是达到预期的效果，而不是整个窗口。此外，tabItem 的内容似乎作为视觉刷打印了几次。这是一个例子。自定义装饰器被包裹在一个包含 2 个文本块的堆栈面板上，一个包含“GP：”，另一个包含一个数字。这是在标签项中应用它时的前后照片：
那么，我该如何纠正呢？
我将在此处发布我的代码 sn-ps，因为我在回答后对它们进行了一些修改（尽管不是以“破坏”这一点的方式）
这是带有装饰器的 XAML：
<models:TipFocusDecorator IsOpen="{Binding TutorialBoolGP}" TipHead="{Binding TutorialTitle}" TipText="{Binding TutorialDescription}" TipPos="{Binding TutorialPosition}">
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Background="Transparent">
<TextBlock Text="GP: " />
<TextBlock Text="{Binding PlayerGP, Converter={StaticResource IntToComma}}" />
</StackPanel>
</models:TipFocusDecorator>
装饰者：
public class TipFocusDecorator : Decorator
{
public bool IsOpen
{
get { return (bool)GetValue(IsOpenProperty); }
set { SetValue(IsOpenProperty, value); }
}
// Using a DependencyProperty as the backing store for Open. This enables animation, styling, binding, etc...
public static readonly DependencyProperty IsOpenProperty =
DependencyProperty.Register("IsOpen", typeof(bool), typeof(TipFocusDecorator),
new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, IsOpenPropertyChanged));
public string TipText
{
get { return (string)GetValue(TipTextProperty); }
set { SetValue(TipTextProperty, value); }
}
// Using a DependencyProperty as the backing store for TipText. This enables animation, styling, binding, etc...
public static readonly DependencyProperty TipTextProperty =
DependencyProperty.Register("TipText", typeof(string), typeof(TipFocusDecorator), new UIPropertyMetadata(string.Empty));
public string TipHead
{
get { return (string)GetValue(TipHeadProperty); }
set { SetValue(TipHeadProperty, value); }
}
// Using a DependencyProperty as the backing store for TipText. This enables animation, styling, binding, etc...
public static readonly DependencyProperty TipHeadProperty =
DependencyProperty.Register("TipHead", typeof(string), typeof(TipFocusDecorator), new UIPropertyMetadata(string.Empty));
public string TipPos
{
get { return (string)GetValue(TipPosProperty); }
set { SetValue(TipPosProperty, value); }
}
// Using a DependencyProperty as the backing store for TipPos. This enables animation, styling, binding, etc...
public static readonly DependencyProperty TipPosProperty =
DependencyProperty.Register("TipPos", typeof(string), typeof(TipFocusDecorator), new UIPropertyMetadata(string.Empty));
public bool HasBeenShown
{
get { return (bool)GetValue(HasBeenShownProperty); }
set { SetValue(HasBeenShownProperty, value); }
}
// Using a DependencyProperty as the backing store for HasBeenShown. This enables animation, styling, binding, etc...
public static readonly DependencyProperty HasBeenShownProperty =
DependencyProperty.Register("HasBeenShown", typeof(bool), typeof(TipFocusDecorator), new UIPropertyMetadata(false));
private static void IsOpenPropertyChanged(object sender, DependencyPropertyChangedEventArgs e)
{
var decorator = sender as TipFocusDecorator;
if ((bool)e.NewValue)
{
if (!decorator.HasBeenShown)
decorator.HasBeenShown = true;
decorator.Open();
}
if (!(bool)e.NewValue)
{
decorator.Close();
}
}
TipFocusAdorner adorner;
protected void Open()
{
adorner = new TipFocusAdorner(this.Child);
var adornerLayer = AdornerLayer.GetAdornerLayer(this.Child);
adornerLayer.Add(adorner);
TutorialTip tip = new TutorialTip(TipHead,TipText,TipPos);
tip.Owner = Application.Current.MainWindow;
double width = tip.Width;
double height = tip.Height;
Point position = this.Child.PointToScreen(new Point(0d, 0d));
switch (TipPos)
{
case "Bottom":
position.X += (this.Child.RenderSize.Width / 2) - (width / 2);
position.Y += this.Child.RenderSize.Height + 10;
break;
case "Top":
position.X += (this.Child.RenderSize.Width / 2) - (width / 2);
position.Y += -height - 10;
break;
case "Left":
position.X += -width - 10;
position.Y += (this.Child.RenderSize.Height / 2) - (height / 2);
break;
case "Right":
position.X += this.Child.RenderSize.Width + 10;
position.Y += (this.Child.RenderSize.Height / 2) - (height / 2);
break;
}
tip.Left = position.X;
tip.Top = position.Y;
tip.ShowDialog();
//MessageBox.Show(TipText + position); // Change for your custom tip Window
IsOpen = false;
}
protected void Close()
{
var adornerLayer = AdornerLayer.GetAdornerLayer(this.Child);
adornerLayer.Remove(adorner);
adorner = null;
}
}
最后是装饰器：
public class TipFocusAdorner : Adorner
{
public TipFocusAdorner(UIElement adornedElement)
: base(adornedElement)
{
}
protected override void OnRender(System.Windows.Media.DrawingContext drawingContext)
{
base.OnRender(drawingContext);
var root = Window.GetWindow(this);
var adornerLayer = AdornerLayer.GetAdornerLayer(AdornedElement);
var presentationSource = PresentationSource.FromVisual(adornerLayer);
Matrix transformToDevice = presentationSource.CompositionTarget.TransformToDevice;
var sizeInPixels = transformToDevice.Transform((Vector)adornerLayer.RenderSize);
RenderTargetBitmap rtb = new RenderTargetBitmap((int)(sizeInPixels.X), (int)(sizeInPixels.Y), 96, 96, PixelFormats.Default);
var oldEffect = root.Effect;
var oldVisibility = AdornedElement.Visibility;
root.Effect = new BlurEffect();
AdornedElement.SetCurrentValue(FrameworkElement.VisibilityProperty, Visibility.Hidden);
rtb.Render(root);
AdornedElement.SetCurrentValue(FrameworkElement.VisibilityProperty, oldVisibility);
root.Effect = oldEffect;
drawingContext.DrawImage(rtb, adornerLayer.TransformToVisual(AdornedElement).TransformBounds(new Rect(adornerLayer.RenderSize)));
drawingContext.DrawRectangle(new SolidColorBrush(Color.FromArgb(22, 0, 0, 0)), null, adornerLayer.TransformToVisual(AdornedElement).TransformBounds(new Rect(adornerLayer.RenderSize)));
drawingContext.DrawRectangle(new VisualBrush(AdornedElement) { AlignmentX = AlignmentX.Left, TileMode = TileMode.None, Stretch = Stretch.None },
null,
AdornedElement.RenderTransform.TransformBounds(new Rect(AdornedElement.RenderSize)));
}
}
【问题讨论】：
标签： c# wpf xaml decorator adorner