WPF 带清除按钮的文字框SearchTextBox

来源：互联网发布：剑网三菊花插件数据编辑：程序博客网时间：2024/06/16 11:22

基于TextBox的带清除按钮的搜索框

样式部分：

    <!--带清除按钮文字框-->    <Style TargetType="{x:Type local:XSearchTextBox}">        <Setter Property="VerticalContentAlignment" Value="Center"/>        <Setter Property="Template">            <Setter.Value>                <ControlTemplate TargetType="{x:Type local:XSearchTextBox}">                    <Border CornerRadius="0" BorderBrush="#FFE2E0E0" BorderThickness="1" Padding="0,0,5,0" Background="{TemplateBinding Background}">                        <DockPanel LastChildFill="True">                            <Button Width="16" Height="16" DockPanel.Dock="Right" x:Name="PART_ContentHostClearButton">                                <Button.Template>                                    <ControlTemplate TargetType="{x:Type Button}">                                        <Border x:Name="PART_Border" CornerRadius="8" BorderBrush="Transparent" BorderThickness="0" Padding="2">                                            <Path x:Name="PART_Path" Data="M6,6 L6,6 10,10 M10,6 L10,6 6,10" Fill="Gray" Stretch="Fill" Stroke="Gray" StrokeThickness="2" HorizontalAlignment="Center" VerticalAlignment="Center" />                                        </Border>                                        <ControlTemplate.Triggers>                                            <Trigger Property="IsMouseOver" Value="True">                                                <Setter Property="Background" TargetName="PART_Border">                                                    <Setter.Value>                                                        <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">                                                            <GradientStop Color="Silver" Offset="0.0" />                                                            <GradientStop Color="White" Offset="0.5" />                                                            <GradientStop Color="Silver" Offset="0.0" />                                                        </LinearGradientBrush>                                                    </Setter.Value>                                                </Setter>                                                <Setter Property="Stroke" TargetName="PART_Path" Value="#FFBA3232"/>                                            </Trigger>                                            <Trigger Property="IsPressed" Value="True">                                                <Setter Property="UIElement.Effect">                                                    <Setter.Value>                                                        <DropShadowEffect BlurRadius="10" Color="Black" Direction="0" Opacity="0.6" RenderingBias="Performance" ShadowDepth="0" />                                                    </Setter.Value>                                                </Setter>                                            </Trigger>                                            <Trigger Property="IsFocused" Value="True" />                                        </ControlTemplate.Triggers>                                    </ControlTemplate>                                </Button.Template>                            </Button>                            <Button Width="16" Height="16" DockPanel.Dock="Right" Visibility="Collapsed" x:Name="PART_ContentHostSeachButton">                                <Button.Template>                                    <ControlTemplate TargetType="{x:Type Button}">                                        <Path Name="searchPath" Stretch="Fill" Fill="Gray"                                              Data="F1 M 42.5,22C 49.4036,22 55,27.5964 55,34.5C 55,41.4036 49.4036,47 42.5,47C 40.1356,47 37.9245,46.3435 36,45.2426L 26.9749,54.2678C 25.8033,55.4393 23.9038,55.4393 22.7322,54.2678C 21.5607,53.0962 21.5607,51.1967 22.7322,50.0251L 31.7971,40.961C 30.6565,39.0755 30,36.8644 30,34.5C 30,27.5964 35.5964,22 42.5,22 Z M 42.5,26C 37.8056,26 34,29.8056 34,34.5C 34,39.1944 37.8056,43 42.5,43C 47.1944,43 51,39.1944 51,34.5C 51,29.8056 47.1944,26 42.5,26 Z ">                                            <Path.RenderTransform>                                                <RotateTransform Angle="-90" CenterX="8" CenterY="8" />                                            </Path.RenderTransform>                                        </Path>                                    </ControlTemplate>                                </Button.Template>                            </Button>                            <ScrollViewer DockPanel.Dock="Left" Margin="2" x:Name="PART_ContentHost" Background="{TemplateBinding Background}"/>                        </DockPanel>                    </Border>                </ControlTemplate>            </Setter.Value>        </Setter>    </Style>

代码部分：

    public class XSearchTextBox : TextBox    {        static XSearchTextBox()        {            DefaultStyleKeyProperty.OverrideMetadata(typeof(XSearchTextBox), new FrameworkPropertyMetadata(typeof(XSearchTextBox)));        }        [CategoryAttribute("自定义属性"), DescriptionAttribute("获取或设置默认文字")]        public string PlaceHolder        {            get { return (string)GetValue(PlaceHolderProperty); }            set { SetValue(PlaceHolderProperty, value); }        }        [CategoryAttribute("自定义属性"), DescriptionAttribute("获取或设置默认文字")]        public static readonly DependencyProperty PlaceHolderProperty = DependencyProperty.Register("PlaceHolder", typeof(string), typeof(XSearchTextBox));        public override void OnApplyTemplate()        {            base.OnApplyTemplate();            ButtonBase clearBtn = this.Template.FindName("PART_ContentHostClearButton", this) as ButtonBase;            ButtonBase searchBtn = this.Template.FindName("PART_ContentHostSeachButton", this) as ButtonBase;            searchBtn.Visibility = Visibility.Visible;            clearBtn.Visibility = Visibility.Collapsed;            this.Text = PlaceHolder;            this.Opacity = 0.4;            clearBtn.Click += (s, e) =>            {                this.Text = "";            };            this.LostFocus += (s, e) =>            {                if (this.Text.Length == 0)                {                    this.Text = PlaceHolder;                    this.Opacity = 0.4;                    searchBtn.Visibility = Visibility.Visible;                    clearBtn.Visibility = Visibility.Collapsed;                }                else                {                    clearBtn.Visibility = Visibility.Visible;                    searchBtn.Visibility = Visibility.Collapsed;                }            };            this.GotFocus += (s, e) =>            {                if (this.Text == PlaceHolder)                {                    this.Text = "";                }                clearBtn.Visibility = Visibility.Visible;                searchBtn.Visibility = Visibility.Collapsed;            };        }        protected override void OnTextChanged(TextChangedEventArgs e)        {            if (this.Text != PlaceHolder)            {                base.OnTextChanged(e);            }            if (this.Template != null)            {                ButtonBase clearBtn = this.Template.FindName("PART_ContentHostClearButton", this) as ButtonBase;                ButtonBase searchBtn = this.Template.FindName("PART_ContentHostSeachButton", this) as ButtonBase;                this.Opacity = 1;                if (this.Text.Length > 0)                {                    if (this.Text != PlaceHolder)                    {                        clearBtn.Visibility = Visibility.Visible;                        searchBtn.Visibility = Visibility.Collapsed;                    }                    else                    {                        this.Opacity = 0.4;                        searchBtn.Visibility = Visibility.Visible;                        clearBtn.Visibility = Visibility.Collapsed;                    }                }                else                {                    if (this.IsFocused)                    {                        clearBtn.Visibility = Visibility.Visible;                        searchBtn.Visibility = Visibility.Collapsed;                    }                    else                    {                        this.Text = PlaceHolder;                    }                }            }        }    }

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