Implementing #7

Incrementing/Decrementing via mouse can be configured to:
- Vertical only
- Horizontal only
- Vertical and Horizontal

mouse drags.

source/NumericUpDownLib/Base/AbstractBaseUpDown.xaml.cs

@@ -1,5 +1,6 @@
 namespace NumericUpDownLib.Base
 {
+    using NumericUpDownLib.Enums;
     using NumericUpDownLib.Models;
     using System;
     using System.Windows;
@@ -165,6 +166,13 @@ public abstract partial class AbstractBaseUpDown<T> : InputBaseUpDown
             DependencyProperty.Register("IsMouseDragEnabled", typeof(bool),
                 typeof(AbstractBaseUpDown<T>), new PropertyMetadata(true, OnIsMouseDragEnabledChanged));
 
+        /// <summary>
+        /// Backing store of <see cref="CanIncDecMouseDrag"/> dependency property.
+        /// </summary>
+        public static readonly DependencyProperty CanMouseDragProperty =
+            DependencyProperty.Register("CanMouseDrag", typeof(CanIncDecMouseDrag),
+                typeof(AbstractBaseUpDown<T>), new PropertyMetadata(CanIncDecMouseDrag.VerticalHorizontal));
+
         /// <summary>
         /// Holds the REQUIRED textbox instance part for this control.
         /// </summary>
@@ -353,6 +361,18 @@ public bool IsMouseDragEnabled
             set { SetValue(IsMouseDragEnabledProperty, value); }
         }
 
+        /// <summary>
+        /// Gets/sets wether small/large step sizes can be incremented/decremented
+        /// both with vertical/horizontal mouse drag moves or,
+        /// whether only horizontal or only vertical mouse drag moves can
+        /// incremented/decremented only in small or only in large values.
+        /// </summary>
+        public CanIncDecMouseDrag CanMouseDrag
+        {
+            get { return (CanIncDecMouseDrag)GetValue(CanMouseDragProperty); }
+            set { SetValue(CanMouseDragProperty, value); }
+        }
+
         /// <summary>
         /// Determines whether last text input was from a user (key was down) or not.
         /// </summary>
@@ -594,8 +614,8 @@ private void _PART_TextBox_MouseMove(object sender, MouseEventArgs e)
             }
 
             var pos = GetPositionFromThis(e);
-            double deltaX = _objMouseIncr.Point.X - pos.X;
-            double deltaY = _objMouseIncr.Point.Y - pos.Y;
+            double deltaX = (CanMouseDrag == CanIncDecMouseDrag.VerticalOnly ? 0 : _objMouseIncr.Point.X - pos.X);
+            double deltaY = (CanMouseDrag == CanIncDecMouseDrag.HorizontalOnly ? 0 : _objMouseIncr.Point.Y - pos.Y);
 
             if (_objMouseIncr.MouseDirection == MouseDirections.None)
             {

source/NumericUpDownLib/Enums/CanIncDecMouseDrag.cs

@@ -0,0 +1,26 @@
+namespace NumericUpDownLib.Enums
+{
+	/// <summary>
+	/// Defines the mouse drag modes that are supported to increment/decrement
+	/// small/large values allowing horizontal/vertical mouse drag moves at the same
+	/// time or each direction only by itself.
+	/// </summary>
+	public enum CanIncDecMouseDrag
+	{
+		/// <summary>
+		/// A value can be incremented/decremented in small steps using vertical mouse drag moves only.
+		/// </summary>
+		VerticalOnly,
+
+		/// <summary>
+		/// A value can be incremented/decremented in large steps using horizontal mouse drag moves only.
+		/// </summary>
+		HorizontalOnly,
+
+		/// <summary>
+		/// A value can be incremented/decremented in small steps or large steps
+		/// using vertical or horizontal mouse drag moves at the same time.
+		/// </summary>
+		VerticalHorizontal
+	}
+}

source/NumericUpDownLib/NumericUpDownLib.csproj

@@ -24,7 +24,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <None Include="images/SyncArrow_64x.png" Pack="true" PackagePath=""/>
+    <None Include="images/SyncArrow_64x.png" Pack="true" PackagePath="" />
   </ItemGroup>
 
   <ItemGroup>