数字框优化

VIZ.Framework.Common/Widgets/NumberBox/NumberBox.cs

@@ -14,6 +14,7 @@ using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
+using VIZ.Framework.Core;
 
 namespace VIZ.Framework.Common
 {
@@ -109,7 +110,11 @@ namespace VIZ.Framework.Common
         /// Using a DependencyProperty as the backing store for Interval.  This enables animation, styling, binding, etc...
         /// </summary>
         public static readonly DependencyProperty IntervalProperty =
-            DependencyProperty.Register("Interval", typeof(double), typeof(NumberBox), new PropertyMetadata(1d));
+            DependencyProperty.Register("Interval", typeof(double), typeof(NumberBox), new PropertyMetadata(1d, new PropertyChangedCallback((s, e) =>
+            {
+                // 重置正则表达式
+                (s as NumberBox).ResetRegex();
+            })));
 
         #endregion
 
@@ -143,6 +148,16 @@ namespace VIZ.Framework.Common
         private RepeatButton PART_Down;
 
         /// <summary>
+        /// 之前的文本值
+        /// </summary>
+        private string old_text;
+
+        /// <summary>
+        /// 数字正则表达式
+        /// </summary>
+        private Regex regex;
+
+        /// <summary>
         /// 应用模板
         /// </summary>
         public override void OnApplyTemplate()
@@ -166,34 +181,43 @@ namespace VIZ.Framework.Common
         }
 
         /// <summary>
-        /// 文本改变之后
+        /// 失去焦点
         /// </summary>
-        protected override void OnTextChanged(TextChangedEventArgs e)
+        protected override void OnLostFocus(RoutedEventArgs e)
         {
-            base.OnTextChanged(e);
+            base.OnLostFocus(e);
 
-            if (string.IsNullOrWhiteSpace(this.Text))
+            if (!double.TryParse(this.Text, out double value))
             {
-                this.Text = "0";
+                value = this.MinValue;
+            }
 
-                return;
+            value = MathHelper.Clip(this.MinValue, this.MaxValue, value);
+            value = Math.Round(value, MathHelper.GetDigitsPrecision(value));
+
+            this.Text = value.ToString();
+            this.Value = value;
         }
 
-            if (!double.TryParse(this.Text, out double value))
+        /// <summary>
+        /// 文本改变之后
+        /// </summary>
+        protected override void OnTextChanged(TextChangedEventArgs e)
         {
-                this.Text = this.Value.ToString();
-            }
-            else if (value < this.MinValue)
+            base.OnTextChanged(e);
+
+            if (this.regex == null)
             {
-                this.Value = this.MinValue;
+                this.ResetRegex();
             }
-            else if (value > this.MaxValue)
+
+            if (!this.regex.IsMatch(this.Text))
             {
-                this.Value = this.MaxValue;
+                this.Text = this.old_text;
             }
             else
             {
-                this.Value = value;
+                this.old_text = this.Text;
             }
         }
 
@@ -203,11 +227,12 @@ namespace VIZ.Framework.Common
         private void PART_Down_Click(object sender, RoutedEventArgs e)
         {
             double value = this.Value - this.Interval;
+            value = Math.Round(value, MathHelper.GetDigitsPrecision(value));
 
             if (value < this.MinValue || value > this.MaxValue)
                 return;
 
-            this.Text = value.ToString();
+            this.Value = value;
         }
 
         /// <summary>
@@ -216,12 +241,49 @@ namespace VIZ.Framework.Common
         private void PART_Up_Click(object sender, RoutedEventArgs e)
         {
             double value = this.Value + this.Interval;
+            value = Math.Round(value, MathHelper.GetDigitsPrecision(value));
 
             if (value < this.MinValue || value > this.MaxValue)
                 return;
 
-            this.Text = value.ToString();
+            this.Value = value;
         }
 
+        /// <summary>
+        /// 重置正则表达式
+        /// </summary>
+        private void ResetRegex()
+        {
+            double precision = MathHelper.GetDigitsPrecision(this.Interval);
+            StringBuilder sb = new StringBuilder();
+            sb.Append("^");
+            if (this.MinValue < 0)
+            {
+                if (precision > 0)
+                {
+                    sb.Append("[-.]*");
+                }
+                else
+                {
+                    sb.Append("[-]*");
+                }
+            }
+            else
+            {
+                if (precision > 0)
+                {
+                    sb.Append("[.]*");
+                }
+            }
+            sb.Append("[0-9]*");
+            if (precision > 0)
+            {
+                sb.Append("[.]*[0-9]{0," + precision + "}");
+            }
+
+            sb.Append("$");
+
+            regex = new Regex(sb.ToString());
+        }
     }
 }

VIZ.Framework.Core/Math/MathHelper.cs

@@ -35,5 +35,23 @@ namespace VIZ.Framework.Core
 
             return result;
         }
+
+        /// <summary>
+        /// 获数值精度（小数点后几位）
+        /// </summary>
+        /// <param name="value">数值</param>
+        /// <returns>精度</returns>
+        public static int GetDigitsPrecision(double value)
+        {
+            string str = value.ToString();
+
+            string[] items = str.Split('.');
+            if (items.Length != 2)
+            {
+                return 0;
+            }
+
+            return items[1].Length;
+        }
     }
 }

VIZ.Framework.WpfTest/NumberBoxTest/NumberBoxTest.xaml

@@ -16,8 +16,13 @@
     </UserControl.Resources>
 
     <Grid>
-        <fcommon:NumberBox Height="40" Width="240" Interval="0.1" Value="{Binding Path=Value,Mode=TwoWay}"></fcommon:NumberBox>
+        <TextBlock Text="{Binding ElementName=nb,Path=Value}" 
+                   VerticalAlignment="Center" HorizontalAlignment="Center" FontSize="36" Foreground="Red" Margin="0,0,0,140"></TextBlock>
+        <fcommon:NumberBox x:Name="nb" Height="40" Width="240" Interval="0.01" Value="{Binding Path=Value,Mode=TwoWay}"></fcommon:NumberBox>
 
         <Button Width="120" Height="30" Margin="0,200,0,0" Click="Button_Click"></Button>
+        <Button Width="120" Height="30" Margin="400,200,0,0"></Button>
+        
+        
     </Grid>
 </UserControl>