Wie erreicht man LayoutTransform in UWP?

Question

Ich versuche, eine Ansicht wie LayoutTranform in WPF zu transformieren. Können wir LayoutTransform in UWP erreichen?

Answer 1

Ist Ihre Frage Wie verwendet man Layouttransformation in uwp?

Ich finde this Post und the answer kann Ihnen helfen.

Das Bild ist, dass ich die App öffnen und ich klicke auf die Schaltfläche, die Bild drehen.

Das Bild drehen.

Das erste, was ist es, eine Klasse erstellen.

using System; 
using System.Diagnostics.CodeAnalysis; 
using Windows.Foundation; 
using Windows.UI.Xaml; 
using Windows.UI.Xaml.Controls; 
using Windows.UI.Xaml.Media; 

namespace Common 
{ 
    /// <summary> 
    /// Represents a control that applies a layout transformation to its Content. 
    /// </summary> 
    /// <QualityBand>Preview</QualityBand> 
    [TemplatePart(Name = TransformRootName, Type = typeof(Grid))] 
    [TemplatePart(Name = PresenterName, Type = typeof(ContentPresenter))] 
    public sealed class LayoutTransformer : ContentControl 
    { 
     /// <summary> 
     /// Name of the TransformRoot template part. 
     /// </summary> 
     private const string TransformRootName = "TransformRoot"; 

     /// <summary> 
     /// Name of the Presenter template part. 
     /// </summary> 
     private const string PresenterName = "Presenter"; 

     /// <summary> 
     /// Gets or sets the layout transform to apply on the LayoutTransformer 
     /// control content. 
     /// </summary> 
     /// <remarks> 
     /// Corresponds to UIElement.LayoutTransform. 
     /// </remarks> 
     public Transform LayoutTransform 
     { 
      get { return (Transform) GetValue(LayoutTransformProperty); } 
      set { SetValue(LayoutTransformProperty, value); } 
     } 

     /// <summary> 
     /// Identifies the LayoutTransform DependencyProperty. 
     /// </summary> 
     public static readonly DependencyProperty LayoutTransformProperty = DependencyProperty.Register(
      "LayoutTransform", typeof(Transform), typeof(LayoutTransformer), new PropertyMetadata(null, LayoutTransformChanged)); 

     /// <summary> 
     /// Gets the child element being transformed. 
     /// </summary> 
     private FrameworkElement Child 
     { 
      get 
      { 
       // Preferred child is the content; fall back to the presenter itself 
       return (null != _contentPresenter) ? 
        (_contentPresenter.Content as FrameworkElement ?? _contentPresenter) : 
        null; 
      } 
     } 

     // Note: AcceptableDelta and DecimalsAfterRound work around double arithmetic rounding issues on Silverlight. 

     private const double AcceptableDelta = 0.0001; 

     private const int DecimalsAfterRound = 4; 

     private Panel _transformRoot; 

     private ContentPresenter _contentPresenter; 

     private MatrixTransform _matrixTransform; 

     private Matrix _transformation; 

     private Size _childActualSize = Size.Empty; 

     public LayoutTransformer() 
     { 
      // Associated default style 
      DefaultStyleKey = typeof(LayoutTransformer); 

      // Can't tab to LayoutTransformer 
      IsTabStop = false; 
#if SILVERLIGHT 
      // Disable layout rounding because its rounding of values confuses things 
      UseLayoutRounding = false; 
#endif 
     } 

     /// <summary> 
     /// Builds the visual tree for the LayoutTransformer control when a new 
     /// template is applied. 
     /// </summary> 
     protected override void OnApplyTemplate() 
     { 
      // Apply new template 
      base.OnApplyTemplate(); 
      // Find template parts 
      _transformRoot = GetTemplateChild(TransformRootName) as Grid; 
      _contentPresenter = GetTemplateChild(PresenterName) as ContentPresenter; 
      _matrixTransform = new MatrixTransform(); 
      if (null != _transformRoot) 
      { 
       _transformRoot.RenderTransform = _matrixTransform; 
      } 
      // Apply the current transform 
      ApplyLayoutTransform(); 
     } 

     /// <summary> 
     /// Handles changes to the Transform DependencyProperty. 
     /// </summary> 
     /// <param name="o">Source of the change.</param> 
     /// <param name="e">Event args.</param> 
     private static void LayoutTransformChanged(DependencyObject o, DependencyPropertyChangedEventArgs e) 
     { 
      // Casts are safe because Silverlight is enforcing the types 
      ((LayoutTransformer) o).ProcessTransform((Transform) e.NewValue); 
     } 

     /// <summary> 
     /// Applies the layout transform on the LayoutTransformer control content. 
     /// </summary> 
     /// <remarks> 
     /// Only used in advanced scenarios (like animating the LayoutTransform). 
     /// Should be used to notify the LayoutTransformer control that some aspect 
     /// of its Transform property has changed. 
     /// </remarks> 
     public void ApplyLayoutTransform() 
     { 
      ProcessTransform(LayoutTransform); 
     } 

     /// <summary> 
     /// Processes the Transform to determine the corresponding Matrix. 
     /// </summary> 
     /// <param name="transform">Transform to process.</param> 
     private void ProcessTransform(Transform transform) 
     { 
      // Get the transform matrix and apply it 
      _transformation = RoundMatrix(GetTransformMatrix(transform), DecimalsAfterRound); 
      if (null != _matrixTransform) 
      { 
       _matrixTransform.Matrix = _transformation; 
      } 
      // New transform means re-layout is necessary 
      InvalidateMeasure(); 
     } 

     /// <summary> 
     /// Walks the Transform(Group) and returns the corresponding Matrix. 
     /// </summary> 
     /// <param name="transform">Transform(Group) to walk.</param> 
     /// <returns>Computed Matrix.</returns> 
     private Matrix GetTransformMatrix(Transform transform) 
     { 
      if (null != transform) 
      { 
       // WPF equivalent of this entire method: 
       // return transform.Value; 

       // Process the TransformGroup 
       TransformGroup transformGroup = transform as TransformGroup; 
       if (null != transformGroup) 
       { 
        Matrix groupMatrix = Matrix.Identity; 
        foreach (Transform child in transformGroup.Children) 
        { 
         groupMatrix = MatrixMultiply(groupMatrix, GetTransformMatrix(child)); 
        } 
        return groupMatrix; 
       } 

       // Process the RotateTransform 
       RotateTransform rotateTransform = transform as RotateTransform; 
       if (null != rotateTransform) 
       { 
        double angle = rotateTransform.Angle; 
        double angleRadians = (2 * Math.PI * angle)/360; 
        double sine = Math.Sin(angleRadians); 
        double cosine = Math.Cos(angleRadians); 
        return new Matrix(cosine, sine, -sine, cosine, 0, 0); 
       } 

       // Process the ScaleTransform 
       ScaleTransform scaleTransform = transform as ScaleTransform; 
       if (null != scaleTransform) 
       { 
        double scaleX = scaleTransform.ScaleX; 
        double scaleY = scaleTransform.ScaleY; 
        return new Matrix(scaleX, 0, 0, scaleY, 0, 0); 
       } 

       // Process the SkewTransform 
       SkewTransform skewTransform = transform as SkewTransform; 
       if (null != skewTransform) 
       { 
        double angleX = skewTransform.AngleX; 
        double angleY = skewTransform.AngleY; 
        double angleXRadians = (2 * Math.PI * angleX)/360; 
        double angleYRadians = (2 * Math.PI * angleY)/360; 
        return new Matrix(1, angleYRadians, angleXRadians, 1, 0, 0); 
       } 

       // Process the MatrixTransform 
       MatrixTransform matrixTransform = transform as MatrixTransform; 
       if (null != matrixTransform) 
       { 
        return matrixTransform.Matrix; 
       } 

       // TranslateTransform has no effect in LayoutTransform 
      } 

      // Fall back to no-op transformation 
      return Matrix.Identity; 
     } 

     /// <summary> 
     /// Provides the behavior for the "Measure" pass of layout. 
     /// </summary> 
     /// <param name="availableSize">The available size that this element can give to child elements.</param> 
     /// <returns>The size that this element determines it needs during layout, based on its calculations of child element sizes.</returns> 
     protected override Size MeasureOverride(Size availableSize) 
     { 
      FrameworkElement child = Child; 
      if ((null == _transformRoot) || (null == child)) 
      { 
       // No content, no size 
       return Size.Empty; 
      } 

      //DiagnosticWriteLine("MeasureOverride < " + availableSize); 
      Size measureSize; 
      if (_childActualSize == Size.Empty) 
      { 
       // Determine the largest size after the transformation 
       measureSize = ComputeLargestTransformedSize(availableSize); 
      } 
      else 
      { 
       // Previous measure/arrange pass determined that Child.DesiredSize was larger than believed 
       //DiagnosticWriteLine(" Using _childActualSize"); 
       measureSize = _childActualSize; 
      } 

      // Perform a mesaure on the _transformRoot (containing Child) 
      //DiagnosticWriteLine(" _transformRoot.Measure < " + measureSize); 
      _transformRoot.Measure(measureSize); 
      //DiagnosticWriteLine(" _transformRoot.DesiredSize = " + _transformRoot.DesiredSize); 

      // WPF equivalent of _childActualSize technique (much simpler, but doesn't work on Silverlight 2) 
      // // If the child is going to render larger than the available size, re-measure according to that size 
      // child.Arrange(new Rect()); 
      // if (child.RenderSize != child.DesiredSize) 
      // { 
      //  _transformRoot.Measure(child.RenderSize); 
      // } 

      // Transform DesiredSize to find its width/height 
      Rect transformedDesiredRect = RectTransform(new Rect(0, 0, _transformRoot.DesiredSize.Width, _transformRoot.DesiredSize.Height), _transformation); 
      Size transformedDesiredSize = new Size(transformedDesiredRect.Width, transformedDesiredRect.Height); 

      // Return result to allocate enough space for the transformation 
      //DiagnosticWriteLine("MeasureOverride > " + transformedDesiredSize); 
      return transformedDesiredSize; 
     } 

     /// <summary> 
     /// Provides the behavior for the "Arrange" pass of layout. 
     /// </summary> 
     /// <param name="finalSize">The final area within the parent that this element should use to arrange itself and its children.</param> 
     /// <returns>The actual size used.</returns> 
     /// <remarks> 
     /// Using the WPF paramater name finalSize instead of Silverlight's finalSize for clarity 
     /// </remarks> 
     protected override Size ArrangeOverride(Size finalSize) 
     { 
      FrameworkElement child = Child; 
      if ((null == _transformRoot) || (null == child)) 
      { 
       // No child, use whatever was given 
       return finalSize; 
      } 

      //DiagnosticWriteLine("ArrangeOverride < " + finalSize); 
      // Determine the largest available size after the transformation 
      Size finalSizeTransformed = ComputeLargestTransformedSize(finalSize); 
      if (IsSizeSmaller(finalSizeTransformed, _transformRoot.DesiredSize)) 
      { 
       // Some elements do not like being given less space than they asked for (ex: TextBlock) 
       // Bump the working size up to do the right thing by them 
       //DiagnosticWriteLine(" Replacing finalSizeTransformed with larger _transformRoot.DesiredSize"); 
       finalSizeTransformed = _transformRoot.DesiredSize; 
      } 
      //DiagnosticWriteLine(" finalSizeTransformed = " + finalSizeTransformed); 

      // Transform the working size to find its width/height 
      Rect transformedRect = RectTransform(new Rect(0, 0, finalSizeTransformed.Width, finalSizeTransformed.Height), _transformation); 
      // Create the Arrange rect to center the transformed content 
      Rect finalRect = new Rect(
       -transformedRect.Left + ((finalSize.Width - transformedRect.Width)/2), 
       -transformedRect.Top + ((finalSize.Height - transformedRect.Height)/2), 
       finalSizeTransformed.Width, 
       finalSizeTransformed.Height); 

      // Perform an Arrange on _transformRoot (containing Child) 
      //DiagnosticWriteLine(" _transformRoot.Arrange < " + finalRect); 
      _transformRoot.Arrange(finalRect); 
      //DiagnosticWriteLine(" Child.RenderSize = " + child.RenderSize); 

      // This is the first opportunity under Silverlight to find out the Child's true DesiredSize 
      if (IsSizeSmaller(finalSizeTransformed, child.RenderSize) && (Size.Empty == _childActualSize)) 
      { 
       // Unfortunately, all the work so far is invalid because the wrong DesiredSize was used 
       //DiagnosticWriteLine(" finalSizeTransformed smaller than Child.RenderSize"); 
       // Make a note of the actual DesiredSize 
       _childActualSize = new Size(child.ActualWidth, child.ActualHeight); 
       //DiagnosticWriteLine(" _childActualSize = " + _childActualSize); 
       // Force a new measure/arrange pass 
       InvalidateMeasure(); 
      } 
      else 
      { 
       // Clear the "need to measure/arrange again" flag 
       _childActualSize = Size.Empty; 
      } 
      //DiagnosticWriteLine(" _transformRoot.RenderSize = " + _transformRoot.RenderSize); 

      // Return result to perform the transformation 
      //DiagnosticWriteLine("ArrangeOverride > " + finalSize); 
      return finalSize; 
     } 

     /// <summary> 
     /// Compute the largest usable size (greatest area) after applying the transformation to the specified bounds. 
     /// </summary> 
     /// <param name="arrangeBounds">Arrange bounds.</param> 
     /// <returns>Largest Size possible.</returns> 
     [SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification = "Closely corresponds to WPF's FrameworkElement.FindMaximalAreaLocalSpaceRect.")] 
     private Size ComputeLargestTransformedSize(Size arrangeBounds) 
     { 
      //DiagnosticWriteLine(" ComputeLargestTransformedSize < " + arrangeBounds); 

      // Computed largest transformed size 
      Size computedSize = Size.Empty; 

      // Detect infinite bounds and constrain the scenario 
      bool infiniteWidth = double.IsInfinity(arrangeBounds.Width); 
      if (infiniteWidth) 
      { 
       arrangeBounds.Width = arrangeBounds.Height; 
      } 
      bool infiniteHeight = double.IsInfinity(arrangeBounds.Height); 
      if (infiniteHeight) 
      { 
       arrangeBounds.Height = arrangeBounds.Width; 
      } 

      // Capture the matrix parameters 
      double a = _transformation.M11; 
      double b = _transformation.M12; 
      double c = _transformation.M21; 
      double d = _transformation.M22; 

      // Compute maximum possible transformed width/height based on starting width/height 
      // These constraints define two lines in the positive x/y quadrant 
      double maxWidthFromWidth = Math.Abs(arrangeBounds.Width/a); 
      double maxHeightFromWidth = Math.Abs(arrangeBounds.Width/c); 
      double maxWidthFromHeight = Math.Abs(arrangeBounds.Height/b); 
      double maxHeightFromHeight = Math.Abs(arrangeBounds.Height/d); 

      // The transformed width/height that maximize the area under each segment is its midpoint 
      // At most one of the two midpoints will satisfy both constraints 
      double idealWidthFromWidth = maxWidthFromWidth/2; 
      double idealHeightFromWidth = maxHeightFromWidth/2; 
      double idealWidthFromHeight = maxWidthFromHeight/2; 
      double idealHeightFromHeight = maxHeightFromHeight/2; 

      // Compute slope of both constraint lines 
      double slopeFromWidth = -(maxHeightFromWidth/maxWidthFromWidth); 
      double slopeFromHeight = -(maxHeightFromHeight/maxWidthFromHeight); 

      if ((0 == arrangeBounds.Width) || (0 == arrangeBounds.Height)) 
      { 
       // Check for empty bounds 
       computedSize = new Size(arrangeBounds.Width, arrangeBounds.Height); 
      } 
      else if (infiniteWidth && infiniteHeight) 
      { 
       // Check for completely unbound scenario 
       computedSize = new Size(double.PositiveInfinity, double.PositiveInfinity); 
      } 
      else if (!MatrixHasInverse(_transformation)) 
      { 
       // Check for singular matrix 
       computedSize = new Size(0, 0); 
      } 
      else if ((0 == b) || (0 == c)) 
      { 
       // Check for 0/180 degree special cases 
       double maxHeight = (infiniteHeight ? double.PositiveInfinity : maxHeightFromHeight); 
       double maxWidth = (infiniteWidth ? double.PositiveInfinity : maxWidthFromWidth); 
       if ((0 == b) && (0 == c)) 
       { 
        // No constraints 
        computedSize = new Size(maxWidth, maxHeight); 
       } 
       else if (0 == b) 
       { 
        // Constrained by width 
        double computedHeight = Math.Min(idealHeightFromWidth, maxHeight); 
        computedSize = new Size(
         maxWidth - Math.Abs((c * computedHeight)/a), 
         computedHeight); 
       } 
       else if (0 == c) 
       { 
        // Constrained by height 
        double computedWidth = Math.Min(idealWidthFromHeight, maxWidth); 
        computedSize = new Size(
         computedWidth, 
         maxHeight - Math.Abs((b * computedWidth)/d)); 
       } 
      } 
      else if ((0 == a) || (0 == d)) 
      { 
       // Check for 90/270 degree special cases 
       double maxWidth = (infiniteHeight ? double.PositiveInfinity : maxWidthFromHeight); 
       double maxHeight = (infiniteWidth ? double.PositiveInfinity : maxHeightFromWidth); 
       if ((0 == a) && (0 == d)) 
       { 
        // No constraints 
        computedSize = new Size(maxWidth, maxHeight); 
       } 
       else if (0 == a) 
       { 
        // Constrained by width 
        double computedHeight = Math.Min(idealHeightFromHeight, maxHeight); 
        computedSize = new Size(
         maxWidth - Math.Abs((d * computedHeight)/b), 
         computedHeight); 
       } 
       else if (0 == d) 
       { 
        // Constrained by height 
        double computedWidth = Math.Min(idealWidthFromWidth, maxWidth); 
        computedSize = new Size(
         computedWidth, 
         maxHeight - Math.Abs((a * computedWidth)/c)); 
       } 
      } 
      else if (idealHeightFromWidth <= ((slopeFromHeight * idealWidthFromWidth) + maxHeightFromHeight)) 
      { 
       // Check the width midpoint for viability (by being below the height constraint line) 
       computedSize = new Size(idealWidthFromWidth, idealHeightFromWidth); 
      } 
      else if (idealHeightFromHeight <= ((slopeFromWidth * idealWidthFromHeight) + maxHeightFromWidth)) 
      { 
       // Check the height midpoint for viability (by being below the width constraint line) 
       computedSize = new Size(idealWidthFromHeight, idealHeightFromHeight); 
      } 
      else 
      { 
       // Neither midpoint is viable; use the intersection of the two constraint lines instead 
       computedSize = new Size(
        computedWidth, 
        (slopeFromWidth * computedWidth) + maxHeightFromWidth); 
      } 

      // Return result 
      //DiagnosticWriteLine(" ComputeLargestTransformedSize > " + computedSize); 
      return computedSize; 
     } 

     /// <summary> 
     /// Returns true if Size a is smaller than Size b in either dimension. 
     /// </summary> 
     /// <param name="a">Second Size.</param> 
     /// <param name="b">First Size.</param> 
     /// <returns>True if Size a is smaller than Size b in either dimension.</returns> 
     private static bool IsSizeSmaller(Size a, Size b) 
     {     
      return ((a.Width + AcceptableDelta < b.Width) || (a.Height + AcceptableDelta < b.Height)); 
     } 

     /// <summary> 
     /// Rounds the non-offset elements of a Matrix to avoid issues due to floating point imprecision. 
     /// </summary> 
     /// <param name="matrix">Matrix to round.</param> 
     /// <param name="decimals">Number of decimal places to round to.</param> 
     /// <returns>Rounded Matrix.</returns> 
     private static Matrix RoundMatrix(Matrix matrix, int decimals) 
     { 
      return new Matrix(
       Math.Round(matrix.M11, decimals), 
       Math.Round(matrix.M12, decimals), 
       Math.Round(matrix.M21, decimals), 
       Math.Round(matrix.M22, decimals), 
       matrix.OffsetX, 
       matrix.OffsetY); 
     } 

     /// <summary> 
     /// Implements WPF's Rect.Transform on Silverlight. 
     /// </summary> 
     /// <param name="rect">Rect to transform.</param> 
     /// <param name="matrix">Matrix to transform with.</param> 
     /// <returns>Bounding box of transformed Rect.</returns> 
     private static Rect RectTransform(Rect rect, Matrix matrix) 
     { 
      // WPF equivalent of following code: 
      Point leftTop = matrix.Transform(new Point(rect.Left, rect.Top)); 
      Point rightTop = matrix.Transform(new Point(rect.Right, rect.Top)); 
      Point leftBottom = matrix.Transform(new Point(rect.Left, rect.Bottom)); 
      Point rightBottom = matrix.Transform(new Point(rect.Right, rect.Bottom)); 
      double left = Math.Min(Math.Min(leftTop.X, rightTop.X), Math.Min(leftBottom.X, rightBottom.X)); 
      double top = Math.Min(Math.Min(leftTop.Y, rightTop.Y), Math.Min(leftBottom.Y, rightBottom.Y)); 
      double right = Math.Max(Math.Max(leftTop.X, rightTop.X), Math.Max(leftBottom.X, rightBottom.X)); 
      double bottom = Math.Max(Math.Max(leftTop.Y, rightTop.Y), Math.Max(leftBottom.Y, rightBottom.Y)); 
      Rect rectTransformed = new Rect(left, top, right - left, bottom - top); 
      return rectTransformed; 
     } 

     /// <summary> 
     /// Implements WPF's Matrix.Multiply on Silverlight. 
     /// </summary> 
     /// <param name="matrix1">First matrix.</param> 
     /// <param name="matrix2">Second matrix.</param> 
     /// <returns>Multiplication result.</returns> 
     private static Matrix MatrixMultiply(Matrix matrix1, Matrix matrix2) 
     { 
      // WPF equivalent of following code: 
      // return Matrix.Multiply(matrix1, matrix2); 
      return new Matrix(
       (matrix1.M11 * matrix2.M11) + (matrix1.M12 * matrix2.M21), 
       (matrix1.M11 * matrix2.M12) + (matrix1.M12 * matrix2.M22), 
       (matrix1.M21 * matrix2.M11) + (matrix1.M22 * matrix2.M21), 
       (matrix1.M21 * matrix2.M12) + (matrix1.M22 * matrix2.M22), 
       ((matrix1.OffsetX * matrix2.M11) + (matrix1.OffsetY * matrix2.M21)) + matrix2.OffsetX, 
       ((matrix1.OffsetX * matrix2.M12) + (matrix1.OffsetY * matrix2.M22)) + matrix2.OffsetY); 
     } 

     /// <summary> 
     /// Implements WPF's Matrix.HasInverse on Silverlight. 
     /// </summary> 
     /// <param name="matrix">Matrix to check for inverse.</param> 
     /// <returns>True if the Matrix has an inverse.</returns> 
     private static bool MatrixHasInverse(Matrix matrix) 
     {     
      return (0 != ((matrix.M11 * matrix.M22) - (matrix.M12 * matrix.M21))); 
     } 
    } 
} 

Und fügen Sie diesen Code in App.xaml

xmlns:common="using:Common" 

einen neuen Stil

innerhalb von Application erstellen

<Application.Resources> 
    <Style TargetType="common:LayoutTransformer"> 
     <Setter Property="Foreground" Value="#FF000000"/> 
     <Setter Property="Template"> 
      <Setter.Value> 
       <ControlTemplate TargetType="common:LayoutTransformer"> 
        <Grid x:Name="TransformRoot" Background="{TemplateBinding Background}"> 
         <ContentPresenter 
        x:Name="Presenter" 
        Content="{TemplateBinding Content}" 
        ContentTemplate="{TemplateBinding ContentTemplate}"/> 
        </Grid> 
       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 
    </Style> 
</Application.Resources> 

Und ich in XAML.

<Button Margin="10,10,10,10" Content="rot" Click="Button_OnClick"></Button> 

     <common:LayoutTransformer x:Name="jnuTphpltg"> 
      <Image Margin="10,10,10,10" Source="Assets/158839197671.jpg" RenderTransformOrigin="0.5,0.5"> 

      </Image> 
     </common:LayoutTransformer> 

Und ich schreibe etwas in Klick.

jnuTphpltg.LayoutTransform = new RotateTransform() 
    { 
     Angle = 90   
    }; 

schreibe ich den Code in github