如何在windows应用程序中制作键盘

Question

我需要在我正在使用的 Windows 窗体应用程序中使用键盘功能

private void btnW_Click(object sender, EventArgs e)
{
    txtCategory.Text += btnW.Text;      
}

但我需要多个textbox ，例如如果专注于textbox1，它将在textbox1 中添加text，如果TextBox2 专注于键盘button 只会影响TextBox2。

像真正的键盘功能 在.Net 3.5 版本中

在屏幕截图中看到

Answer 1

试试这个：

object obj;
private void btnW_Click(object sender, EventArgs e)
{
    if (obj != null)
    {
        (obj as TextBox).Text += btnW.Text;
    }
}
private void txtCategory_Click(object sender, EventArgs e)
{
    obj = txtCategory;
}
private void textBox1_Click(object sender, EventArgs e)
{
    obj = textBox1;
}

Answer 2

首先找到焦点所在的文本框，然后在该框中设置文本：

private void btnW_Click(object sender, EventArgs e)
{
    Func<Control, TextBox> FindFocusedTextBox(Control control)
    {
        var container = this as IContainerControl;
        while (container != null)
        {
            control = container.ActiveControl;
            container = control as IContainerControl;
        }
        return control as TextBox;
    }

    var focussedTextBox = FindFocusedTextBox(this);
    if(focussedTextBox != null)
        focussedTextBox.Text += btnW.Text;
}

脚注：寻找焦点来源于：What is the preferred way to find focused control in WinForms app?

Answer 3

我想向您推荐一个选项。希望对你有帮助

在页面中声明一个全局TextBoxObject，并将当前聚焦的文本框分配给这个对象。将有一个事件处理程序，让它成为所有按钮的btnW_Click。然后您可以将文本添加到焦点文本框中。参见代码：

TextBox TextBoxObject; // this will be global

// Event handler for all button
private void btnW_Click(object sender, EventArgs e)
{
   if(TextBoxObject!=null)
   {
      TextBoxObject.Text += btnW.Text;   // This will add the character at the end of the current text
      // if you want to Add at the current position means use like this
        int currentIndex = TextBoxObject.SelectionStart;
      TextBoxObject.Text = TextBoxObject.Text.Insert(currentIndex, btnW.Text);
   }
}

您必须使用以下代码将焦点分配给文本框：

private void textBox2_Click(object sender, EventArgs e)
{
    TextBoxObject = textBox1;   
}

Answer 4

试试这个：

对你有帮助。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace StackOverflow
{    
public partial class Form2 : Form
{
    TextBox txtName; 
    public Form2()
    {
        InitializeComponent();
    }

    private void textBox1_Click(object sender, EventArgs e)
    {
        txtName = textBox1;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (txtName != null)
        {
            txtName.Text += button1.Text;                                
        }
    }
    private void button2_Click(object sender, EventArgs e)
    {
        if (txtName != null)
        {
            txtName.Text += button2.Text;             
        }
    }
    private void textBox2_Click(object sender, EventArgs e)
    {
        txtName = textBox2;
    }
}
}