WPF开发经验-实现自带触控键盘的TextBox

一引入

项目有个新需求，当点击或触碰TextBox时，基于TextBox的相对位置，弹出一个自定义的Keyboard，如下图所示：

二 KeyboardControl

先实现一个自定义的KeyboardControl，它继承自Window。

Xaml代码如下：

<Window x:Class="WpfApp1.KeyboardControl"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:local="clr-namespace:WpfApp1" AllowsTransparency="True" WindowStyle="None"

        ResizeMode="NoResize" Background="Transparent" Height="290" Width="668">

    <FrameworkElement.Resources>

        <ResourceDictionary>

            <Style TargetType="{x:Type Button}" x:Key="btnNum">

                <Setter Property="Width" Value="50"/>

                <Setter Property="Height" Value="50"/>

                <Setter Property="Margin" Value="0 0 5 5"/>

                <Setter Property="HorizontalContentAlignment" Value="Center" />

                <Setter Property="VerticalContentAlignment" Value="Center" />

                <Setter Property="Cursor" Value="Hand"/>

                <Setter Property="Template">

                    <Setter.Value>

                        <ControlTemplate TargetType="{x:Type Button}">

                            <Border Name="border" BorderBrush="#FF474747" BorderThickness="1" CornerRadius="6">

                                <Border.Background>

                                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

                                        <GradientStop Color="#FFCCCCCC" />

                                        <GradientStop Color="WhiteSmoke" Offset="0.5" />

                                        <GradientStop Color="#FFCCCCCC" Offset="1" />

                                    </LinearGradientBrush>

                                </Border.Background>

                                <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"

                                    TextElement.Foreground="#333333" TextElement.FontSize="18" />

                            </Border>

                        </ControlTemplate>

                    </Setter.Value>

                </Setter>

            </Style>

            <Style TargetType="{x:Type Button}" x:Key="btnFunc">

                <Setter Property="HorizontalContentAlignment" Value="Center" />

                <Setter Property="VerticalContentAlignment" Value="Center" />

                <Setter Property="Width" Value="50"/>

                <Setter Property="Height" Value="50"/>

                <Setter Property="Margin" Value="0 0 5 5"/>

                <Setter Property="Foreground" Value="#333333"/>

                <Setter Property="Cursor" Value="Hand"/>

                <Setter Property="Template">

                    <Setter.Value>

                        <ControlTemplate TargetType="{x:Type Button}">

                            <Border

                                Name="border"

                                BorderBrush="#FF565656"

                                BorderThickness="1"

                                CornerRadius="6"  Background="Orange">

                                <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"

                                    TextElement.Foreground="White" TextElement.FontSize="18" />

                            </Border>

                        </ControlTemplate>

                    </Setter.Value>

                </Setter>

            </Style>

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

        </ResourceDictionary>

    </FrameworkElement.Resources>

    <Border Background="Gray" CornerRadius="6" BorderThickness="1" BorderBrush="#333333">

        <StackPanel Margin="5 10 5 5" >

            <Grid>

                <TextBox Name="tbValue" FontSize="28" Height="40"

                    Background="Transparent" BorderBrush="Silver" BorderThickness="1"

                    Foreground="White" HorizontalContentAlignment="Right"

                    SelectionChanged="tbValue_TextChanged"

                    TextChanged="tbValue_TextChanged" />

            </Grid>

            <WrapPanel  Orientation="Vertical" >

                <WrapPanel Margin="0 10 0 0">

                    <Button Content="1" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="2" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="3" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="4" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="5" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="6" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="7" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="8" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="9" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="0" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="-" Click="Button_Click"  Style="{StaticResource btnNum}" />

                    <Button Content="Del" Click="DELButton_Click"   Style="{StaticResource btnFunc}"  Margin="0 0 0 5"/>

                </WrapPanel>

                <WrapPanel Margin="25 0 0 0">

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=q}"

                            Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=w}"

                            Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=e}"

                            Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=r}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=t}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=y}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=u}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=i}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=o}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=p}"

                             Click="Button_Click"/>

                    <Button Content="Clear" Click="ClearButton_Click"  Style="{StaticResource btnFunc}"  />

                </WrapPanel>

                <WrapPanel Margin="45 0 0 0">

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=a}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=s}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=d}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=f}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=g}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=h}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=j}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=k}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=l}"

                             Click="Button_Click"/>

                    <Button Content="." Click="Button_Click"  Style="{StaticResource btnNum}" />

                </WrapPanel>

                <WrapPanel Margin="70 0 0 0">

                    <Button Content="A/a" Click="CapsButton_Click"  Style="{StaticResource btnFunc}"  />

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=z}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=x}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=c}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=v}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=b}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=n}"

                             Click="Button_Click"/>

                    <Button Style="{StaticResource btnNum}" Content="{Binding Path=Caps,RelativeSource={RelativeSource AncestorType={x:Type local:KeyboardControl}},Converter={StaticResource CapsConverter},ConverterParameter=m}"

                             Click="Button_Click"/>

                    <Button Content="Cancel" Click="CancelButton_Click" IsCancel="True" Style="{StaticResource btnFunc}" Width="70"  />

                    <Button Content="OK" Click="OKButton_Click" IsDefault="True" Style="{StaticResource btnFunc}" Width="70"  Margin="0 0 0 5"/>

                </WrapPanel>

            </WrapPanel>

        </StackPanel>

    </Border>

</Window>

后台代码如下：

public partial class KeyboardControl : Window

{

    private int TextIndex { get; set; }

    public string TextStr { get; private set; }//通过该属性，访问Keyboard的文本

    public KeyboardControl(string inputStr)//构造方式传入初始文本

    {

        InitializeComponent();

        TextStr = inputStr;

        tbValue.Text = inputStr;

        tbValue.Focus();

        tbValue.CaretIndex = inputStr.Length;

    }

    public static readonly DependencyProperty CapsProperty = DependencyProperty.Register(

       "Caps", typeof(bool), typeof(KeyboardControl), new PropertyMetadata(default(bool)));

    public bool Caps

    {

        get { return (bool)GetValue(CapsProperty); }

        set { SetValue(CapsProperty, value); }

    }

    private void Button_Click(object sender, RoutedEventArgs e)

    {

        Button button = (Button)sender;

        if (TextIndex == 0)

        {

            tbValue.Text += (string)button.Content;

        }

        else

        {

            tbValue.Text = tbValue.Text.Insert(TextIndex, (string)button.Content);

        }

    }

    private void tbValue_TextChanged(object sender, RoutedEventArgs e)

    {

        TextBox textBox = (TextBox)sender;

        TextIndex = textBox.CaretIndex;

    }

    private void ClearButton_Click(object sender, RoutedEventArgs e)

    {

        tbValue.Text = "";

    }

    private void DELButton_Click(object sender, RoutedEventArgs e)

    {

        if (tbValue.Text.Length > 0)

        {

            if (TextIndex == 0 && tbValue.Text.Length >= 1)

            {

                tbValue.Text = tbValue.Text.Remove(tbValue.Text.Length - 1, 1);

            }

            else if (TextIndex > 0)

            {

                tbValue.Text = tbValue.Text.Remove(TextIndex - 1, 1);

            }

        }

    }

    private void OKButton_Click(object sender, RoutedEventArgs e)

    {

        TextStr = tbValue.Text;

        DialogResult = true;

        Close();

    }

    private void CancelButton_Click(object sender, RoutedEventArgs e)

    {

        DialogResult = false;

        Close();

    }

    private void CapsButton_Click(object sender, RoutedEventArgs e)

    {

        Caps = !Caps;

    }

}

Xaml代码中用到了一个大小写的转换类：

public class CapsConverter : IValueConverter

{

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

    {

        if (parameter == null)

        {

            return "";

        }

        if (value == null)

        {

            return parameter.ToString();

        }

        if (value is bool b)

        {

            return b ? parameter.ToString().ToUpper() : parameter.ToString().ToLower();

        }

        else

        {

            return parameter.ToString();

        }

    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

    {

        throw new NotImplementedException();

    }

}

三 TouchTextBox

定义一个TouchTextBox的分部类。

public partial class TouchTextBox

{

    private Control hostControl;

    //OnClick方法调用时，通过Window.ShowDialog方法，打开KeyboardControl

    public void OnClick(object sender, MouseButtonEventArgs e)

    {

        if (sender is TextBox textBox)

        {

            hostControl = textBox;

            //计算KeyboardControl的位置，弹出KeyboardControl

            var text = Show(textBox.Text, textBox);

            //KeyboardControl关闭后，获取其文本值，赋值给TextBox

            if (!string.IsNullOrEmpty(text))

            {

                textBox.Text = text;

            }

            else

            {

                textBox.Text = string.Empty;

            }

        }

    }

    private string Show(string initValue, object sender = null)

    {

        var keyboard = new KeyboardControl(initValue);

        SetPosition(keyboard);

        bool result = keyboard.ShowDialog().Value;

        if (result)

        {

            return keyboard.TextStr;

        }

        else

        {

            return string.Empty;

        }

    }

    private void SetPosition(Window window)

    {

        Point point = hostControl.PointFromScreen(new Point(0.0, 0.0));

        double width = SystemParameters.WorkArea.Width;

        double height = SystemParameters.WorkArea.Height;

        if (-point.Y + hostControl.ActualHeight + 5.0 + window.Height < height)

        {

            window.Top = -point.Y + hostControl.ActualHeight + 5.0;

        }

        else

        {

            window.Top = -point.Y - window.Height - 5.0;

        }

        if (-point.X + window.Width < width)

        {

            window.Left = -point.X;

        }

        else

        {

            window.Left = -point.X - (window.Width - hostControl.ActualWidth);

        }

    }

}

添加一个名为TouchTextBox的资源字典。

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

                    x:Class="WpfApp1.TouchTextBox">

    <Style x:Key="TouchTextBox" TargetType="{x:Type TextBox}">

        <EventSetter Event="PreviewMouseLeftButtonDown" Handler="OnClick" />

    </Style>

</ResourceDictionary>

四效果展示

在App.Xaml中引入TouchTextBox.Xaml资源。

<Application x:Class="WpfApp1.App"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:local="clr-namespace:WpfApp1"

             StartupUri="MainWindow.xaml">

    <Application.Resources>

        <ResourceDictionary>

            <ResourceDictionary.MergedDictionaries>

                <ResourceDictionary Source="/WpfApp1;component/TouchTextBox.xaml" />

            </ResourceDictionary.MergedDictionaries>

        </ResourceDictionary>

    </Application.Resources>

</Application>

MainWindow界面代码：

<Window x:Class="WpfApp1.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        mc:Ignorable="d"

        Title="MainWindow" Height="800" Width="1200">

    <StackPanel>

        <TextBox Text="Pop up the keyboard after touching" Width="400" HorizontalAlignment="Left" 
　　　　　　　　　　FontSize="18" Margin="20,20"

                 Style="{StaticResource TouchTextBox}"/>

    </StackPanel>

</Window>

设置TextBox的Style为TouchTextBox，则该TextBox实现了自带触控键盘的效果。

以上。

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WPF开发经验-实现自带触控键盘的TextBox

一 引入

二 KeyboardControl

三 TouchTextBox

四 效果展示

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一引入

四效果展示