摘要：
使用系统；使用System.Collections.Generic；使用System.ComponentModel；使用System.Data；使用System.Drawing；使用System.Linq；使用System.Text；使用System.Threading.Tasks；使用System.Windows.Forms；名称
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace TomWinform.CustomerControl { public partial class BorderTextBox : TextBox { //设置Rect消息 private const int EM_SETRECT = 179; //获取Rect消息 private const int EM_GETRECT = 178; //粘贴消息 private const int WM_PASTE = 0x0302; private Color borderColor = Color.Black; private float leftBorderSize = 1; private float rightBorderSize = 1; private float topBorderSize = 1; private float bottomBorderSize = 1; private Padding textPadding = new Padding(1); private bool allowReturn = false; [System.Runtime.InteropServices.DllImport("user32.dll")] static extern IntPtr GetWindowDC(IntPtr hWnd); [System.Runtime.InteropServices.DllImport("user32.dll")] static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC); [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SendMessageA")] private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, string lParam); [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SendMessageA")] private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, ref Rectangle lParam); public BorderTextBox() { InitializeComponent(); } //画边框 private void DrawBorder(IntPtr hDC) { Graphics g = Graphics.FromHdc(hDC); #region 左边框 if (leftBorderSize > 0) { Pen penLeft = new Pen(borderColor, leftBorderSize); Point[] pointLeft = new Point[2]; pointLeft[0] = new Point(0, 0); pointLeft[1] = new Point(0, this.Width - 1); g.DrawLine(penLeft, pointLeft[0], pointLeft[1]); } #endregion #region 右边框 if (rightBorderSize > 0) { Pen penRight = new Pen(borderColor, rightBorderSize); Point[] pointRight = new Point[2]; pointRight[0] = new Point(this.Width - 1, 0); pointRight[1] = new Point(this.Width - 1, this.Height - 1); g.DrawLine(penRight, pointRight[0], pointRight[1]); } #endregion #region 上边框 if (topBorderSize > 0) { Pen penTop = new Pen(borderColor, topBorderSize); Point[] pointTop = new Point[2]; pointTop[0] = new Point(0, 0); pointTop[1] = new Point(this.Width - 1, 0); g.DrawLine(penTop, pointTop[0], pointTop[1]); } #endregion #region 下边框 if (bottomBorderSize > 0) { Pen penBottom = new Pen(borderColor, bottomBorderSize); Point[] pointBottom = new Point[2]; pointBottom[0] = new Point(0, this.Height - 1); pointBottom[1] = new Point(this.Width - 1, this.Height - 1); g.DrawLine(penBottom, pointBottom[0], pointBottom[1]); } #endregion } public void SetTextDispLayout() { if (Text == "") return; //当允许多行和禁止会车时，Paddin有效 if (this.Multiline && (!this.WordWrap)) { Rectangle rect = new Rectangle(); SendMessage(this.Handle, EM_GETRECT, (IntPtr)0, ref rect); //SizeF size = CreateGraphics().MeasureString(Text, Font); //rect.Y = (int)(Height - size.Height) / 2 + TextPadding.Top; rect.Y = textPadding.Top; rect.X = textPadding.Left; rect.Height = Height; rect.Width = Width - textPadding.Right - textPadding.Left; SendMessage(this.Handle, EM_SETRECT, IntPtr.Zero, ref rect); } } protected override void OnPaint(PaintEventArgs pe) { base.OnPaint(pe); } protected override void WndProc(ref Message m) { //string str = ""; //bool flag = false; //int i = 0; //if (m.Msg == 0x0204) // i++; //if (!AllowReturn // && m.Msg == WM_PASTE // && System.Windows.Forms.Clipboard.ContainsText()) //{ // str = System.Windows.Forms.Clipboard.GetText(); // System.Windows.Forms.Clipboard.Clear(); // string nstr = str.Replace(char.ConvertFromUtf32((int)Keys.Return), "").Replace(char.ConvertFromUtf32((int)Keys.LineFeed), ""); // System.Windows.Forms.Clipboard.SetText(nstr); // if (str.Length > 0) flag = true; //} base.WndProc(ref m); if (m.Msg == 0xf || m.Msg == 0x133) { IntPtr hDC = GetWindowDC(m.HWnd); if (hDC.ToInt32() == 0) return; DrawBorder(hDC); //返回结果 m.Result = IntPtr.Zero; //释放 ReleaseDC(m.HWnd, hDC); } //if (flag) //{ // flag = false; // System.Windows.Forms.Clipboard.SetText(str); // str = ""; //} } #region 属性 [Description("边框颜色"), Category("自定义属性")] public Color BorderColor { get { return borderColor; } set { borderColor = value; this.Invalidate(); } } [Description("左边框宽度"), Category("自定义属性")] public float LeftBorderSize { get { return leftBorderSize; } set { leftBorderSize = value; this.Invalidate(); } } [Description("右边框宽度"), Category("自定义属性")] public float RightBorderSize { get { return rightBorderSize; } set { rightBorderSize = value; this.Invalidate(); } } [Description("上边框宽度"), Category("自定义属性")] public float TopBorderSize { get { return topBorderSize; } set { topBorderSize = value; this.Invalidate(); } } [Description("下边框宽度"), Category("自定义属性")] public float BottomBorderSize { get { return bottomBorderSize; } set { bottomBorderSize = value; this.Invalidate(); } } [/*DisplayName("內邊距")*/Description("文本内边距，当允许多行和禁止回车时有效"), Category("自定义属性")] public Padding TextPadding { get { return textPadding; } set { textPadding = value; SetTextDispLayout(); } } [/*DisplayName("允許回車")*/Description("是否允许回车"), Category("自定义属性")] public bool AllowReturn { get { return allowReturn; } set { allowReturn = value;this.Invalidate(); } } #endregion #region 事件 protected override void OnKeyPress(KeyPressEventArgs e) { //如果不允许回车 屏蔽回车 换行键值 if (!AllowReturn && ((int)e.KeyChar == (int)Keys.Return || (int)e.KeyChar == (int)Keys.LineFeed)) { e.Handled = true; } base.OnKeyPress(e); } protected override void OnTextChanged(EventArgs e) { base.OnTextChanged(e); SetTextDispLayout(); } #endregion } }