月更

AntDesignWPF/Utils/DpiUtil.cs

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+namespace AntDesign.WPF.Utils
+{
+    using System.Windows;
+    using System.Windows.Media;
+
+    public  static class DpiUtil
+    {
+        public static DpiScale GetDpi(Visual visual)
+        {
+#if NET40 || NET45
+            var source = PresentationSource.FromVisual(visual);
+
+            if (source?.CompositionTarget == null)
+            {
+                return new DpiScale(1.0, 1.0);
+            }
+
+            var device = source.CompositionTarget.TransformToDevice;
+            return new DpiScale(device.M11, device.M22); 
+#else
+            return VisualTreeHelper.GetDpi(visual);
+#endif
+        }
+    }
+
+#if NET40 || NET45
+    /// <summary>Stores DPI information from which a <see cref="T:System.Windows.Media.Visual" /> or <see cref="T:System.Windows.UIElement" /> is rendered.</summary>
+    public struct DpiScale
+    {
+        /// <summary>Gets the DPI scale on the X axis.</summary>
+        /// <returns>The DPI scale for the X axis.</returns>
+        public double DpiScaleX { get; private set; }
+
+        /// <summary>Gets the DPI scale on the Yaxis.</summary>
+        /// <returns>The DPI scale for the Y axis.</returns>
+        public double DpiScaleY { get; private set; }
+
+        /// <summary>Get or sets the PixelsPerDip at which the text should be rendered.</summary>
+        /// <returns>The current <see cref="P:System.Windows.DpiScale.PixelsPerDip" /> value.</returns>
+        public double PixelsPerDip
+        {
+            get
+            {
+                return DpiScaleY;
+            }
+        }
+
+        /// <summary>Gets the DPI along X axis.</summary>
+        /// <returns>The DPI along the X axis.</returns>
+        public double PixelsPerInchX
+        {
+            get
+            {
+                return 96.0 * DpiScaleX;
+            }
+        }
+
+        /// <summary>Gets the DPI along Y axis.</summary>
+        /// <returns>The DPI along the Y axis.</returns>
+        public double PixelsPerInchY
+        {
+            get
+            {
+                return 96.0 * DpiScaleY;
+            }
+        }
+
+        /// <summary>Initializes a new instance of the <see cref="T:System.Windows.DpiScale" /> structure.</summary>
+        /// <param name="dpiScaleX">The DPI scale on the X axis.</param>
+        /// <param name="dpiScaleY">The DPI scale on the Y axis. </param>
+        public DpiScale(double dpiScaleX, double dpiScaleY)
+        {
+            DpiScaleX = dpiScaleX;
+            DpiScaleY = dpiScaleY;
+        }
+    }
+#endif
+}