189 8069 5689

如何用WPF代码实现自带触控键盘的文本框

本文小编为大家详细介绍“如何用WPF代码实现自带触控键盘的文本框”,内容详细,步骤清晰,细节处理妥当,希望这篇“如何用WPF代码实现自带触控键盘的文本框”文章能帮助大家解决疑惑,下面跟着小编的思路慢慢深入,一起来学习新知识吧。

让客户满意是我们工作的目标,不断超越客户的期望值来自于我们对这个行业的热爱。我们立志把好的技术通过有效、简单的方式提供给客户,将通过不懈努力成为客户在信息化领域值得信任、有价值的长期合作伙伴,公司提供的服务项目有:域名注册、网页空间、营销软件、网站建设、诸城网站维护、网站推广。

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:

如何用WPF代码实现自带触控键盘的文本框

二 KeyboardControl

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();
    }
}

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。


    
        
    

四 效果展示

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。

读到这里,这篇“如何用WPF代码实现自带触控键盘的文本框”文章已经介绍完毕,想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会,如果想了解更多相关内容的文章,欢迎关注创新互联行业资讯频道。


网站名称:如何用WPF代码实现自带触控键盘的文本框
当前网址:http://jkwzsj.com/article/ihsodp.html

其他资讯