自定义TextBox,实现自增自减

我们使用附加属性来实现，依赖属性也可以实现，原理一样

如图

xmal

 

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:TextBoxTest">


    <local:BoolToVisibleConverter x:Key="BoolToVisibleConverter"/>


    <Style TargetType="{x:Type TextBox}" >
        <Setter Property="BorderBrush"
                Value="LightGray"/>
        <Setter Property="BorderThickness"
                Value="1"/>
        <Setter Property="Foreground"
                Value="#3E3E3E" />
        <Setter Property="Background"
                Value="White"/>
        <Setter Property="FontSize" Value="15"/>
       

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TextBox}">
                    <Border x:Name="border" 
                                BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}" 
                                Background="{TemplateBinding Background}"
                                CornerRadius="{Binding Path=(local:TextBoxHelper.CornerRadius),RelativeSource={RelativeSource AncestorType=TextBox}, Mode=OneWay}"
                                SnapsToDevicePixels="True">
                        <Grid >
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*" />
                                <ColumnDefinition Width="Auto" />
                            </Grid.ColumnDefinitions>
                            <ScrollViewer x:Name="PART_ContentHost" 
                                          Focusable="false" 
                                          HorizontalScrollBarVisibility="Hidden"
                                          VerticalScrollBarVisibility="Hidden"/>

                            <Grid Grid.Column="1">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="*"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <Grid>
                                    <RepeatButton Width="25" 
                                                  VerticalAlignment="Center"
                                                  HorizontalAlignment="Center"
                                                  Name="PART_BtnAdd"
                                                  Visibility="{Binding Path=(local:TextBoxHelper.IsAddButtonVisible),RelativeSource={RelativeSource AncestorType=TextBox}, Converter={StaticResource BoolToVisibleConverter}}">
                                        <RepeatButton.Content>
                                            <Image Source="上箭头1.png"></Image>
                                        </RepeatButton.Content>
                                    </RepeatButton>
                                </Grid>
                                <Grid  Grid.Row="1">
                                    <RepeatButton Width="25"
                                                  VerticalAlignment="Center"
                                                   HorizontalAlignment="Center"
                                                  Name="PART_BtnRemove"
                                                   Visibility="{Binding Path=(local:TextBoxHelper.IsRemoveButtonVisible),RelativeSource={RelativeSource AncestorType=TextBox}, Converter={StaticResource BoolToVisibleConverter}}" >
                                        <RepeatButton.Content>
                                            <Image Source="下箭头1.png"></Image>
                                        </RepeatButton.Content>
                                    </RepeatButton>
                                </Grid>
                            </Grid>

                        </Grid>
                    </Border>

                    <ControlTemplate.Triggers>
                        <Trigger  Property="IsEnabled"
                                  Value="False">
                            <Setter Property="Opacity"
                                    Value="0.4"/>
                        </Trigger>

                    </ControlTemplate.Triggers>
                </ControlTemplate>

            </Setter.Value>
        </Setter>



    </Style>

</ResourceDictionary>

CS,定义附加属性

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;

namespace TextBoxTest
{

 public class BoolToVisibleConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return (bool)value ? Visibility.Visible : Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }

    /// <summary>
    /// 测试附加属性
    /// </summary>
    public class TextBoxHelper
    {

        public static bool GetIsAddButtonVisible(DependencyObject obj)
        {
            return (bool)obj.GetValue(IsAddButtonVisibleProperty);
        }

        public static void SetIsAddButtonVisible(DependencyObject obj, bool value)
        {
            obj.SetValue(IsAddButtonVisibleProperty, value);
        }

        // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty IsAddButtonVisibleProperty =
            DependencyProperty.RegisterAttached("IsAddButtonVisible", typeof(bool), typeof(TextBoxHelper), new PropertyMetadata(OnTextChanged));




        public static bool GetIsRemoveButtonVisible(DependencyObject obj)
        {
            return (bool)obj.GetValue(IsRemoveButtonVisibleProperty);
        }

        public static void SetIsRemoveButtonVisible(DependencyObject obj, bool value)
        {
            obj.SetValue(IsRemoveButtonVisibleProperty, value);
        }

      
        public static readonly DependencyProperty IsRemoveButtonVisibleProperty =
            DependencyProperty.RegisterAttached("IsRemoveButtonVisible", typeof(bool), typeof(TextBoxHelper), new PropertyMetadata(OnTextChanged));



        private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var textbox = d as TextBox;

            if ((bool)e.NewValue == true)
            {
                textbox.MouseWheel += Textbox_MouseWheel; 

            }
            else
            {
                textbox.MouseWheel -= Textbox_MouseWheel; 

            }

            textbox.RemoveHandler(Button.ClickEvent, new RoutedEventHandler(ButtonClicked));
            textbox.AddHandler(Button.ClickEvent, new RoutedEventHandler(ButtonClicked));
        }

        /// <summary>
        /// 鼠标滚轮
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private static void Textbox_MouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
        {
            var textbox = sender as TextBox;
            double temp;
            bool result = double.TryParse(textbox.Text, out temp);

            if (result == true)
            {
                if (e.Delta > 0)
                {
                    textbox.Text = (temp + 1).ToString();

                }
                else
                {
                    textbox.Text = (temp - 1).ToString();
                }
                textbox.Select(textbox.Text.Length, 0);//光标设置到文本尾部
            }

        }

        private static void ButtonClicked(object sender, RoutedEventArgs e)
        {
            var button = e.OriginalSource as RepeatButton;

            if (button == null)
                return;

            var textbox = sender as TextBox;

            if (textbox == null)
                return;

            double temp;
            bool result = double.TryParse(textbox.Text, out temp);
            if (result == true)
            {
                if (button.Name == "PART_BtnAdd")
                {
                    textbox.Text = (temp + 1).ToString();
                }
                else
                {
                    textbox.Text = (temp - 1).ToString();
                }
                textbox.Focus();
                textbox.Select(textbox.Text.Length, 0);
            }

        }





    }
}

使用

  <TextBox Width="100" Height="25" 
                 local:TextBoxHelper.IsAddButtonVisible="True"
                 local:TextBoxHelper.IsRemoveButtonVisible="True"></TextBox>

 

demo

https://github.com/danyueming/AddDeleteTextBox/tree/master/TextBoxTest

 

来源：CSDN

作者：淡月明

链接：https://blog.csdn.net/sinat_31608641/article/details/103461238