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  • 《学习笔记》WPF 自定义控件并使用(例如带水印和字体图标的文本框)

    一睹为快

     创建方式:

    1. 先创建用户使用控件(UserControl)
    2. 修改用户使用控件前台代码左上角UserControl改为TextBox,后台带代码将UserControl替换为TextBox目的是让其控件继承TextBox控件,注意当前图中
      前台代码效果图:


       后台的代码效果图:

    3. 创建依赖属性:

       输入快捷键propdp双击Tab键生成代码

      public int MyProperty
              {
                  get { return (int)GetValue(MyPropertyProperty); }
                  set { SetValue(MyPropertyProperty, value); }
              }
              public static readonly DependencyProperty MyPropertyProperty =
                  DependencyProperty.Register("MyProperty", typeof(int), typeof(ownerclass), new PropertyMetadata(0));
      
      提示:int 是你控件属性的类型,MyProperty是控件属性名称,MypropertyProperty是依赖属性名称,ownerclass是自定义控件名称,new PropertyMetadata(0)中的0是默认值(必填),切记相同颜色的文字都是一一对应的 必须相同
      例如我要添加字体图标,如下代码:
      public string Ico
              {
                  get { return (string)GetValue(IcoProperty); }
                  set { SetValue(IcoProperty, value); }
              }
              public static readonly DependencyProperty IcoProperty =
                  DependencyProperty.Register("Ico", typeof(string), typeof(LayuiTextBox), new PropertyMetadata("xf007"));
      

     返回前台代码修改其控件样式(d:DesignHeight="50" d:DesignWidth="200"-->>>是指当前界面模拟设计宽高),用鼠标右击当前界面选中编辑模板中的编辑副本,此时我们VS工具将自动在当前界面中显示改控件用到的所有内容,如图:

      5.修改ControlTemplate中的样式,我们直接在Border中Grid,并且在Grid中加入两列,一列存放字体图标,另一列存放输入框的内容,如上图中Name为ico的TextBlock控件就是存字体图标,Nane为prompt和PART_ContentHost是分别为水印字体输入内容

      

    <Border x:Name="border" CornerRadius="{Binding ElementName=LayTextBox,Path=BorderRadius}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Name="icoWidth" Width="50"/>
                                        <ColumnDefinition  />
                                    </Grid.ColumnDefinitions>
                                    <TextBlock Name="ico" Text="{Binding ElementName=LayTextBox,Path=Ico}" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>
                                    <TextBlock Name="prompt" Grid.Column="1" Opacity="0" Margin="0,0,5,0" Text="{Binding ElementName=LayTextBox,Path=Prompt}" HorizontalAlignment="Left" VerticalAlignment="Center"></TextBlock>
                                    <ScrollViewer Grid.Column="1" x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden" Grid.ColumnSpan="2" Margin="0,0,5,0"/>
                                </Grid>
                            </Border>
    

      注意:红色背景文字中Text内容是在绑定我们在后台中注册的Ico属性,此Ico是用来传值,Binding ElementName=LayTextBox,Path=Ico是在说寻找当前控件LayTextBox中的Ico属性名称,ElementName是指当前控件名称,Path为属性名称

      6.设置触发器

    <ControlTemplate.Triggers>
                                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self},Path=IcoStatus}" Value="false">
                                    <Setter TargetName="icoWidth" Property="Width" Value="0" />
                                    <Setter TargetName="PART_ContentHost" Property="Margin" Value="5,0,5,0" />
                                    <Setter TargetName="prompt" Property="Margin" Value="5,0,5,0" />
                                </DataTrigger>
                                <Trigger Property="Text" Value="">
                                    <Setter Property="Opacity" Value=".3" TargetName="prompt"/>
                                </Trigger>
                                <Trigger Property="IsEnabled" Value="false">
                                    <Setter Property="Opacity" TargetName="border" Value="0.56"/>
                                </Trigger>
                                <Trigger Property="IsMouseOver" Value="true">
                                    <Setter Property="BorderBrush" TargetName="border" Value="#D2D2D2"/>
                                </Trigger>
                                <Trigger Property="IsKeyboardFocused" Value="true">
                                    <Setter Property="BorderBrush" TargetName="border" Value="#D2D2D2"/>
                                </Trigger>
     </ControlTemplate.Triggers>
    

      注意:DataTrigger为数据触发器,是指当用户输入相对应的值时出发的事件,如 Binding="{Binding RelativeSource={RelativeSource Self},Path=IcoStatus}" Value="false" 是在说当用户输入的值为空时将触发效果,Trigger是属性触发器档该控件属性达到一定条件下触发相对应的事件

      7.返回当前主界面调用自定义控件(LayuiTextBox),在当前主界面引用 xmlns:layui="clr-namespace:LayUI_WPF.CustomControl",这个引用是在告诉当前窗体调用当前项目LayUI_WPF中的CustomControl文件夹下面的自定义控件并取名为layui

      8.使用我们自定义好的控件<layui:LayuiTextBox Ico="&#xf2b9;" x:Name="text" Prompt="输入用户名" BorderRadius="10" FontFamily="/LayUI-WPF;component/Fonts/#FontAwesome" /> ,其中Ico就就是我们定义行的Ico属性我们可以在里面存放字体图标代码带到我们想要的效果

      9.依次类推 水印,边框 甚至带清空按钮的输入框都能实现,以下是我写好的带水印和字体图标的输入框代码

      前台代码为:

    <TextBox.Resources>
            <Style x:Key="TextBoxStyle" TargetType="{x:Type TextBox}">
                <Setter Property="BorderBrush" Value="#ddd"/>
                <Setter Property="Width" Value="200"/>
                <Setter Property="Height" Value="50"/>
                <Setter Property="Foreground" Value="Black"/>
                <Setter Property="VerticalContentAlignment" Value="Center"/>
                <Setter Property="BorderThickness" Value="1"/>
                <Setter Property="AllowDrop" Value="true"/>
                <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
                <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type TextBox}">
                            <Border x:Name="border" CornerRadius="{Binding ElementName=LayTextBox,Path=BorderRadius}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Name="icoWidth" Width="50"/>
                                        <ColumnDefinition  />
                                    </Grid.ColumnDefinitions>
                                    <TextBlock Name="ico" Text="{Binding ElementName=LayTextBox,Path=Ico}" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>
                                    <TextBlock Name="prompt" Grid.Column="1" Opacity="0" Margin="0,0,5,0" Text="{Binding ElementName=LayTextBox,Path=Prompt}" HorizontalAlignment="Left" VerticalAlignment="Center"></TextBlock>
                                    <ScrollViewer Grid.Column="1" x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden" Grid.ColumnSpan="2" Margin="0,0,5,0"/>
                                </Grid>
                            </Border>
                            <ControlTemplate.Triggers>
                                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self},Path=IcoStatus}" Value="false">
                                    <Setter TargetName="icoWidth" Property="Width" Value="0" />
                                    <Setter TargetName="PART_ContentHost" Property="Margin" Value="5,0,5,0" />
                                    <Setter TargetName="prompt" Property="Margin" Value="5,0,5,0" />
                                </DataTrigger>
                                <Trigger Property="Text" Value="">
                                    <Setter Property="Opacity" Value=".3" TargetName="prompt"/>
                                </Trigger>
                                <Trigger Property="IsEnabled" Value="false">
                                    <Setter Property="Opacity" TargetName="border" Value="0.56"/>
                                </Trigger>
                                <Trigger Property="IsMouseOver" Value="true">
                                    <Setter Property="BorderBrush" TargetName="border" Value="#D2D2D2"/>
                                </Trigger>
                                <Trigger Property="IsKeyboardFocused" Value="true">
                                    <Setter Property="BorderBrush" TargetName="border" Value="#D2D2D2"/>
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
                <Style.Triggers>
                </Style.Triggers>
            </Style>
        </TextBox.Resources>
    

      后台代码为:

    /// <summary>
        /// LayuiTextBox.xaml 的交互逻辑
        /// </summary>
        public partial class LayuiTextBox : TextBox
        {
            public LayuiTextBox()
            {
                InitializeComponent();
            }
            public string Ico
            {
                get { return (string)GetValue(IcoProperty); }
                set { SetValue(IcoProperty, value); }
            }
            public static readonly DependencyProperty IcoProperty =
                DependencyProperty.Register("Ico", typeof(string), typeof(LayuiTextBox), new PropertyMetadata("xf007"));
            public bool IcoStatus
            {
                get { return (bool)GetValue(IcoStatusProperty); }
                set { SetValue(IcoStatusProperty, value); }
            }
            public static readonly DependencyProperty IcoStatusProperty =
                DependencyProperty.Register("IcoStatus", typeof(bool), typeof(LayuiTextBox), new PropertyMetadata(true));
            public string Prompt
            {
                get { return (string)GetValue(PromptProperty); }
                set { SetValue(PromptProperty, value); }
            }
            public static readonly DependencyProperty PromptProperty =
                DependencyProperty.Register("Prompt", typeof(string), typeof(LayuiTextBox), new PropertyMetadata("这是水印"));
            public int BorderRadius
            {
                get { return (int)GetValue(BorderRadiusProperty); }
                set { SetValue(BorderRadiusProperty, value); }
            }
            
            public static readonly DependencyProperty BorderRadiusProperty =
                DependencyProperty.Register("BorderRadius", typeof(int), typeof(LayuiTextBox), new PropertyMetadata(2));
            
        }
    

      最终样式图为一睹为中的样式

    特别提示:字体图标为 Font Awesome

    作者:会害羞的青蛙

    时间:2020-3-28 18:39

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  • 原文地址:https://www.cnblogs.com/ShyFrog/p/12588718.html
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