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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:
先实现一个自定义的KeyboardControl,它继承自Window。
Xaml代码如下:
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(); } }
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。
在App.Xaml中引入TouchTextBox.Xaml资源。
MainWindow界面代码:
设置TextBox的Style为TouchTextBox,则该TextBox实现了自带触控键盘的效果。
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