improve the CoverView

add ItemContentHeightFixedProperty for CoverView

HandyControl/Tools/Helper/ValidateHelper.cs

@@ -3,17 +3,41 @@
     /// <summary>
     ///     验证帮助类
     /// </summary>
-    internal class ValidateHelper
+    public class ValidateHelper
     {
         /// <summary>
         ///     是否在浮点数范围内
         /// </summary>
         /// <param name="value"></param>
         /// <returns></returns>
-        internal static bool IsInRangeOfDouble(object value)
+        public static bool IsInRangeOfDouble(object value)
         {
             var v = (double)value;
             return !(double.IsNaN(v) || double.IsInfinity(v));
         }
+
+        /// <summary>
+        ///     是否在正浮点数范围内
+        /// </summary>
+        /// <param name="value"></param>
+        /// <param name="includeZero"></param>
+        /// <returns></returns>
+        public static bool IsInRangeOfPosDouble(object value, bool includeZero = false)
+        {
+            var v = (double)value;
+            return !(double.IsNaN(v) || double.IsInfinity(v)) && (includeZero ? v >= 0 : v > 0);
+        }
+
+        /// <summary>
+        ///     是否在正浮点数范围内
+        /// </summary>
+        /// <param name="value"></param>
+        /// <param name="includeZero"></param>
+        /// <returns></returns>
+        public static bool IsInRangeOfNegDouble(object value, bool includeZero = false)
+        {
+            var v = (double)value;
+            return !(double.IsNaN(v) || double.IsInfinity(v)) && (includeZero ? v <= 0 : v < 0);
+        }
     }
 }