You can override the form's ProcessCmdKey
method, and handle the key press and focusing on text boxes in it.
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;
}
}
}
}
}
}
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…