WPF 使用依赖属性自定义控件

使用依赖属性自定义控件，依赖属性必须定义在自定义控件中，不能定义在其他文件中

一、先实现一个类继承你要复写的类

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.Input;
using System.Windows.Media;

namespace Demo2.Controls
{
    public class UserNameBox : TextBox
    {

        #region 用户名图标
        public string Icon
        {
            get { return (string)GetValue(IconProperty); }
            set { SetValue(IconProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Icon.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty IconProperty =
            DependencyProperty.Register("Icon", typeof(string), typeof(UserNameBox));
        #endregion

        #region 获取焦点时，用户名图标

        public string Focused_Icon
        {
            get { return (string)GetValue(Focused_IconProperty); }
            set { SetValue(Focused_IconProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Focused_Icon.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty Focused_IconProperty =
            DependencyProperty.Register("Focused_Icon", typeof(string), typeof(UserNameBox));

        #endregion

        #region 水印内容

        public string WaterMark
        {
            get { return (string)GetValue(WaterMarkProperty); }
            set { SetValue(WaterMarkProperty, value); }
        }

        // Using a DependencyProperty as the backing store for WaterMark.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty WaterMarkProperty =
            DependencyProperty.Register("WaterMark", typeof(string), typeof(UserNameBox));

        #endregion

        #region 圆角大小

        public double CornerRadius
        {
            get { return (double)GetValue(CornerRadiusProperty); }
            set { SetValue(CornerRadiusProperty, value); }
        }

        // Using a DependencyProperty as the backing store for CornerRadius.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty CornerRadiusProperty =
            DependencyProperty.Register("CornerRadius", typeof(double), typeof(UserNameBox));

        #endregion

        #region 删除按钮

        public ImageBrush DeleteIcon
        {
            get { return (ImageBrush)GetValue(DeleteIconProperty); }
            set { SetValue(DeleteIconProperty, value); }
        }

        // Using a DependencyProperty as the backing store for DeleteIcon.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty DeleteIconProperty =
            DependencyProperty.Register("DeleteIcon", typeof(ImageBrush), typeof(UserNameBox));

        #endregion

        #region 是否显示密码框

        public bool IsVisiblityPassword
        {
            get { return (bool)GetValue(IsVisiblityPasswordProperty); }
            set { SetValue(IsVisiblityPasswordProperty, value); }
        }

        // Using a DependencyProperty as the backing store for IsVisiblityPassword.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty IsVisiblityPasswordProperty =
            DependencyProperty.Register("IsVisiblityPassword", typeof(bool), typeof(UserNameBox));

        #endregion

    }
}

　在里面定义的依赖属性就为你自定义控件的属性，可以在布局文件中使用它们来进行设定值

可以在布局中设定值，然后在style中进行引用

<Window x:Class="Demo2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:c="clr-namespace:Demo2.Controls"
        xmlns:s="clr-namespace:System;assembly=mscorlib"
        Background="Black"
        WindowStartupLocation="CenterScreen"
        Title="Demo2" Height="300" Width="300">

    <Window.Resources>
        <s:String x:Key="Username_Unclick">/Demo2;component/Resources/Icons/username_unclick.png</s:String>
        <s:String x:Key="Username_Onclick">/Demo2;component/Resources/Icons/username_onclick.png</s:String>
        <s:String x:Key="Password_Unclick">/Demo2;component/Resources/Icons/password_unclick.png</s:String>
        <s:String x:Key="Password_Onclick">/Demo2;component/Resources/Icons/password_onclick.png</s:String>

        <ImageBrush x:Key="Delete_Icon" ImageSource="/Demo2;component/Resources/Icons/delete.png" />
    </Window.Resources>

    <StackPanel>
        <!--用户名-->
        <c:UserNameBox Width="230"
                       Height="38"
                       Margin="0,20,0,0"
                       FontSize="18"
                       Text="{Binding UserName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                       VerticalContentAlignment="Center"
                       WaterMark="用户名"
                       CornerRadius="5"
                       DeleteIcon="{StaticResource Delete_Icon}"
                       Icon="{StaticResource Username_Unclick}"
                       IsVisiblityPassword="False"
                       Focused_Icon="{StaticResource Username_Onclick}"/>

        <!--密码-->
        <c:UserNameBox x:Name="password"
                       Width="230"
                       Height="38"
                       Margin="0,20,0,0"
                       FontSize="18"
                       Text="{Binding Password,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                       VerticalContentAlignment="Center"
                       WaterMark="密码"
                       CornerRadius="5"
                       IsVisiblityPassword="True"
                       DeleteIcon="{StaticResource Delete_Icon}"
                       Icon="{StaticResource Password_Unclick}"
                       Focused_Icon="{StaticResource Password_Onclick}"/>

    </StackPanel>
</Window>

　　

在style中进行引用

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:c="clr-namespace:Demo2.Controls"
                    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
                    xmlns:Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Style  TargetType="{x:Type c:UserNameBox}">
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
        <Setter Property="Background" Value="{x:Null}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Padding" Value="1"/>
        <Setter Property="AllowDrop" Value="true"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type c:UserNameBox}">
                    <Border Background="White"
                            BorderThickness="0"
                            CornerRadius="{Binding RelativeSource={RelativeSource TemplatedParent},Path=CornerRadius}">
                        <Grid>
                            <!--分为3列-->
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="30"/>
                                <ColumnDefinition/>
                                <ColumnDefinition Width="40"/>
                            </Grid.ColumnDefinitions>

                            <!--图标-->
                            <Image Grid.Column="0"
                                   Margin="5,0,5,0"
                                   x:Name="usernameIcon"
                                   Source="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Icon}" />

                            <!--文本和水印-->
                            <ScrollViewer Grid.Column="1"
                                          x:Name="PART_ContentHost"
                                          SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                          Focusable="True"/>
                            <TextBlock x:Name="waterMark"
                                       Grid.Column="1"
                                       VerticalAlignment="Center"
                                       Foreground="Silver"
                                       FontSize="18"
                                       Padding="5,0,0,0" />

                            <!--删除按钮-->
                            <c:DeleteButton x:Name="deleteTextButton"
                                            Grid.Column="2"
                                            Width="15"
                                            Height="15"
                                            Style="{DynamicResource ButtonStyle2}"
                                            ButtonBG="{Binding RelativeSource={RelativeSource TemplatedParent},Path=DeleteIcon}"
                                            Margin="0,5,10,5"
                                            Visibility="Visible"
                                            VerticalAlignment="Center"
                                            HorizontalAlignment="Right"
                                            Focusable="False"
                                            Command="{Binding CleanUserNameCommand}"/>
                        </Grid>
                    </Border>

                    <ControlTemplate.Triggers>
                        <!--当获取焦点时-->
                        <Trigger Property="IsFocused" Value="true">
                            <Setter Property="Source" TargetName="usernameIcon" Value="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Focused_Icon}" />
                        </Trigger>

                        <!--当文本为空时-->
                        <Trigger Property="Text" Value="">
                            <Setter Property="Text" TargetName="waterMark" Value="{Binding RelativeSource={RelativeSource TemplatedParent},Path=WaterMark}" />
                            <Setter Property="Visibility" TargetName="deleteTextButton" Value="Collapsed" />
                        </Trigger>

                        <!--当属性为true时，显示密码框(将文本显示格式更改位密码显示样式)-->
                        <Trigger Property="IsVisiblityPassword" Value="true">
                            <Setter Property="Command" TargetName="deleteTextButton" Value="{Binding CleanPasswordCommand}" />
                            <Setter Property="Height" Value="30"/>
                            <Setter Property="Foreground" Value="Transparent"></Setter>
                            <Setter Property="FontSize" Value="20"></Setter>
                            <Setter Property="FontFamily" Value="Courier New"></Setter>
                            <Setter Property="TextDecorations">
                                <Setter.Value>
                                    <TextDecorationCollection>
                                        <TextDecoration>
                                            <TextDecoration.Pen>
                                                <Pen Thickness="10"
                                                     Brush="Black"
                                                     EndLineCap="Round"
                                                     StartLineCap="Round"
                                                     DashCap="Round"  >
                                                    <Pen.DashStyle>
                                                        <DashStyle Dashes="0.0,1.2" Offset="0.6"/>
                                                    </Pen.DashStyle>
                                                </Pen>
                                            </TextDecoration.Pen>
                                            <TextDecoration.Location>
                                                <TextDecorationLocation>Strikethrough</TextDecorationLocation>
                                            </TextDecoration.Location>
                                        </TextDecoration>
                                    </TextDecorationCollection>
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>