[英]How to recursively select the parent of AdornedElement when returning null
好的,所以我之前收到的答案在這里 ,效果非常好。 然而,在已知問題中,它提到了以下內容:
此外,這不會立即在UserControls內部工作,因為
AdornerLayer.GetAdornerLayer(AdornedElement)
將在UserControls內返回null
。 這可以通過查找UserControl
的父級的AdornerLayer
(或父級的父級,遞歸)來輕松修復。 有這樣的功能。
因此,我在大多數情況下都使用了代碼,但是當我嘗試在tabcontrol中的元素上使用它時遇到了問題。而不是具有所需的效果,模糊效果僅適用於TabItem,而不是整個窗口。 此外,tabItem的內容似乎打印出幾次作為各種視覺畫筆。 這是一個例子。 Custom Decorator包含一個包含2個文本塊的stackpanel,一個包含“GP:”,另一個包含一個數字。 以下是在標簽項中應用此內容時的前后照片:
那么,我該如何糾正這個?
我會在這里發布我的代碼片段,因為我已經稍微修改了它們的答案(雖然不是以“破壞”這個方式)
這是XAML,帶有裝飾器:
<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>
裝飾者:
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Adorner:
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)));
}
}
AdornerLayer.GetAdornerLayer檢索給定元素上方(父級)的裝飾層。 因此,在UserControl中返回null並不一定正確。 只要在UserControl上方存在AdornerLayer,它就會返回。 默認情況下,窗口會創建一個AdornerLayer,但只有在加載后才會創建。 事實上,我使用簡單的方法測試了您的代碼
<Grid x:Name="Container">
<DockPanel>
<TextBlock DockPanel.Dock="Top">Outside of Tab</TextBlock>
<TabControl x:Name="TabControl">
<TabItem Header="Here">
<local:UserControlContainingTipFocus/>
</TabItem>
</TabControl>
</DockPanel>
</Grid>
我無法重現這個問題。 模糊應用於窗口內的所有內容
因此,在您的情況下,必須有UserControl的父級創建AdornerLayer。 我猜測TabControl或TabItem。 您可以使用Snoop進行檢查。
但不用擔心,您可以創建自己的AdornerLayer。 只需將要模糊的元素放在AdornerDecorator中即可。
<Window >
<AdornerDecorator>
<Grid x:Name="Container">
<DockPanel>
<TextBlock DockPanel.Dock="Top">Outside of adorner</TextBlock>
<TabControl x:Name="TabControl">
<TabItem Header="Here">
<local:TestControl></local:TestControl>
</TabItem>
</TabControl>
</DockPanel>
</Grid>
</AdornerDecorator>
</Window>
然后修改對AdornerLayer.GetAdornerLayer的每次調用。 而不是傳遞原始元素,傳遞您想要模糊的容器。 在我的例子中,它是Grid或AdornerDecorator本身。
var root = Window.GetWindow(this);
var blurContainer = (Visual) root.Content;
var adornerLayer = AdornerLayer.GetAdornerLayer(blurContainer);
上面的代碼使用Window.GetWindow並訪問它的內容(第一個孩子)。 但您可以在TipFocusAdorner / Decorator中輕松創建屬性,以指定要傳遞給AdornerLayer.GetAdornerLayer的元素
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