如何使用箭頭在文本框之間移動光標？

Question

我有幾個textboxes，我希望光標使用箭頭鍵從一個textbox移動到另一個。

我該怎麼做？

它看起來像這樣，水龍頭也垂直移動，這很奇怪。

謝謝。

Answer 1

可以重寫窗體的ProcessCmdKey功能，並辦理按鍵，專注於文本框在裏面。

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 TextBoxes 
{ 
    public partial class Form1 : Form 
    { 

     List<TextBox[]> _textBoxes; 
     public Form1() 
     { 
      InitializeComponent(); 

      //Getting a 2 dimentional structure to hold textboxes 
      this._textBoxes= new List<TextBox[]>(); 

      TextBox[] row1 = new TextBox[4]; 
      row1[0] = textBox1; 
      row1[1] = textBox2; 
      row1[2] = textBox3; 
      row1[3] = textBox4; 

      TextBox[] row2 = new TextBox[4]; 
      row2[0] = textBox5; 
      row2[1] = textBox6; 
      row2[2] = textBox7; 
      row2[3] = textBox8; 

      TextBox[] row3 = new TextBox[4]; 
      row3[0] = textBox9; 
      row3[1] = textBox10; 
      row3[2] = textBox11; 
      row3[3] = textBox12; 

      TextBox[] row4 = new TextBox[4]; 
      row4[0] = textBox13; 
      row4[1] = textBox14; 
      row4[2] = textBox15; 
      row4[3] = textBox16; 

      this._textBoxes.Add(row1); 
      this._textBoxes.Add(row2); 
      this._textBoxes.Add(row3); 
      this._textBoxes.Add(row4); 



     } 

     /// <summary> 
     /// Processes a command key. 
     /// </summary> 
     /// <param name="msg">A <see cref="T:System.Windows.Forms.Message"/>, passed by reference, that represents the Win32 message to process.</param> 
     /// <param name="keyData">One of the <see cref="T:System.Windows.Forms.Keys"/> values that represents the key to process.</param> 
     /// <returns> 
     /// true if the keystroke was processed and consumed by the control; otherwise, false to allow further processing. 
     /// </returns> 
     protected override bool ProcessCmdKey(ref Message msg, Keys keyData) 
     { 
      //A key was pressed! 
      Control activeCtrl = this.ActiveControl; 
      TextBox txb = activeCtrl as TextBox; 
      //Handle it only if it was sent when a textbox was focused 
      if (txb != null) 
      { 
       int row; 
       int column; 
       //find out which text box is currently active 
       this.GetTextBoxIndexes(txb, out row, out column); 

       //change indexes according to key stroke 
       if (keyData == Keys.Up) 
       { 
        row--; 
       } 
       else if (keyData == Keys.Down) 
       { 
        row++; 
       } 
       else if (keyData == Keys.Left) 
       { 
        column--; 
       } 
       else if (keyData == Keys.Right) 
       { 
        column++; 
       } 
       //Make sure we are not in negative/out of ranfe index 
       row = Math.Abs(row + 4) % 4; 
       column = Math.Abs(column + 4) % 4; 

       //focus requested text box 
       TextBox slected = this._textBoxes[row][column]; 
       slected.Focus(); 

      } 
      //don't forget not to break the chain... 
      return base.ProcessCmdKey(ref msg, keyData); 


     } 

     /// <summary> 
     /// Gets the text box indexes. 
     /// </summary> 
     /// <param name="txb">The texbox.</param> 
     /// <param name="row">The out row index.</param> 
     /// <param name="column">The out column index.</param> 
     private void GetTextBoxIndexes(TextBox txb, out int row, out int column) 
     { 
      row = -1; 
      column = -1; 
      for (int rowIdx = 0; rowIdx < this._textBoxes.Count; rowIdx++) 
      { 
       TextBox[] currRow = this._textBoxes[rowIdx]; 
       for (int colIdx = 0; colIdx < currRow.Length; colIdx++) 
       { 
        TextBox currTextBox = this._textBoxes[rowIdx][colIdx]; 
        if (currTextBox.Equals(txb)) 
        { 
         row = rowIdx; 
         column = colIdx; 
         return; 
        } 
       } 
      } 
     } 
    } 
} 

Answer 2

如果在文本框中有一些文本，下面的解決方案工作。

首先創建一個KeyDown事件處理程序：

private void textBoxLeft_KeyDown(object sender, KeyEventArgs e) 
    { 
    if (e.KeyCode.Equals(Keys.Right)) 
    { 
     e.Handled = true; 
     //SendKeys.Send("{TAB}"); 
     textBoxRight.Focus(); 
    } 
    } 
    private void textBoxRight_KeyDown(object sender, KeyEventArgs e) 
    { 
    if (e.KeyCode.Equals(Keys.Left)) 
    { 
     e.Handled = true; 
    //SendKeys.Send("+{TAB}"); 
    textBoxLeft.Focus(); 
    } 
} 

Answer 3

嘗試處理按鍵事件
→，←可以強制標籤，Shift + Tab鍵分別按下。
只是一個粗略的想法，因爲我從來沒有試過這個。

Answer 4

剛剛創造性地將這件事擺在了我頭上。這會給你想要的東西。

第1步創建一個TableLayoutPanel並創建列4和行5.刪除所有原始文本框和 第2步將其添加到您的代碼中。

TextBox[] text = new TextBox[20]; //these are your new textboxes 
    private void Form1_Load(object sender, EventArgs e) 
    { 
     for(int i=0; i<text.Length;i++) text[i] = new TextBox() {Text="0"}; //initialize each textbox 
     tableLayoutPanel1.Controls.AddRange(text); //add textboxes to the tablelayoutpanel 
     for(int i = 0; i<tableLayoutPanel1.Controls.Count;i++) //add everything in the tablelayoutpanel to the same keydown event 
     tableLayoutPanel1.Controls[i].KeyDown+=new KeyEventHandler(tableLayoutPanel1_KeyDown); 
    } 

    void tableLayoutPanel1_KeyDown(object sender, KeyEventArgs e) 
    { // this moves the box focus up down left or right 
     if (e.KeyData == Keys.Left) 
      for (int i = 0; i < text.Length; i++) 
      { 
       if (sender.Equals(text[i])) 
       { text[i - 1 < 0 ? text.Length - 1 : i - 1].Focus(); break; } 
      } 
     else if (e.KeyData == Keys.Right) 
      for (int i = 0; i < text.Length; i++) 
      { 
       if (sender.Equals(text[i])) 
       { text[i + 1 > text.Length - 1 ? 0 : i + 1].Focus(); break; } 
      } 
     else if (e.KeyData == Keys.Up) 
      for (int i = 0; i < text.Length; i++) 
      { 
       if (sender.Equals(text[i])) 
       { text[i - 4 < 0 ? i - 4 + text.Length : i - 4].Focus(); break; } 
      } 
     else if (e.KeyData == Keys.Down) 
      for (int i = 0; i < text.Length; i++) 
      { 
       if (sender.Equals(text[i])) 
       { text[i + 4 > text.Length - 1 ? i + 4 - text.Length : i + 4].Focus(); break; } 
      } 
    } 

這將允許您使用箭頭鍵導航上下左右，它會修復與標籤的問題，所以選項卡現在會去正確的Shift + Tab鍵會回去。此外，此解決方案非常好，因爲如果您上下移動，它會像您直覺上預期的那樣迴轉。另外如果你感覺很好，你現在可以對角地移動。