inputbox.cs

能实现文本编辑的功能

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace TextEditor
{
	/// <summary>
	/// The InputBox class is used to show a prompt in a dialog box using the static method Show().
	/// </summary>
	/// <remarks>
	/// Copyright ?2003 Reflection IT
	/// 
	/// This software is provided 'as-is', without any express or implied warranty.
	/// In no event will the authors be held liable for any damages arising from the
	/// use of this software.
	/// 
	/// Permission is granted to anyone to use this software for any purpose,
	/// including commercial applications, subject to the following restrictions:
	/// 
	/// 1. The origin of this software must not be misrepresented; you must not claim
	/// that you wrote the original software. 
	/// 
	/// 2. No substantial portion of the source code of this library may be redistributed
	/// without the express written permission of the copyright holders, where
	/// "substantial" is defined as enough code to be recognizably from this library. 
	/// 
	/// </remarks>
	public class InputBox : System.Windows.Forms.Form
	{
		protected System.Windows.Forms.Button buttonOK;
		protected System.Windows.Forms.Button buttonCancel;
		protected System.Windows.Forms.Label labelPrompt;
		protected System.Windows.Forms.TextBox textBoxText;
        protected System.Windows.Forms.ErrorProvider errorProviderText;
        private IContainer components;

		/// <summary>
		/// Delegate used to validate the object
		/// </summary>
		private InputBoxValidatingHandler _validator;

		private InputBox()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
            this.components = new System.ComponentModel.Container();
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(InputBox));
            this.buttonOK = new System.Windows.Forms.Button();
            this.buttonCancel = new System.Windows.Forms.Button();
            this.textBoxText = new System.Windows.Forms.TextBox();
            this.labelPrompt = new System.Windows.Forms.Label();
            this.errorProviderText = new System.Windows.Forms.ErrorProvider(this.components);
            ((System.ComponentModel.ISupportInitialize)(this.errorProviderText)).BeginInit();
            this.SuspendLayout();
            // 
            // buttonOK
            // 
            this.buttonOK.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.buttonOK.DialogResult = System.Windows.Forms.DialogResult.OK;
            this.buttonOK.Location = new System.Drawing.Point(165, 78);
            this.buttonOK.Name = "buttonOK";
            this.buttonOK.Size = new System.Drawing.Size(90, 24);
            this.buttonOK.TabIndex = 1;
            this.buttonOK.Text = "查找";
            this.buttonOK.Click += new System.EventHandler(this.buttonOK_Click);
            // 
            // buttonCancel
            // 
            this.buttonCancel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.buttonCancel.CausesValidation = false;
            this.buttonCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
            this.buttonCancel.Location = new System.Drawing.Point(298, 78);
            this.buttonCancel.Name = "buttonCancel";
            this.buttonCancel.Size = new System.Drawing.Size(90, 24);
            this.buttonCancel.TabIndex = 2;
            this.buttonCancel.Text = "取消";
            this.buttonCancel.Click += new System.EventHandler(this.buttonCancel_Click);
            // 
            // textBoxText
            // 
            this.textBoxText.Location = new System.Drawing.Point(19, 40);
            this.textBoxText.Name = "textBoxText";
            this.textBoxText.Size = new System.Drawing.Size(369, 21);
            this.textBoxText.TabIndex = 0;
            this.textBoxText.Validating += new System.ComponentModel.CancelEventHandler(this.textBoxText_Validating);
            this.textBoxText.TextChanged += new System.EventHandler(this.textBoxText_TextChanged);
            // 
            // labelPrompt
            // 
            this.labelPrompt.AutoSize = true;
            this.labelPrompt.Location = new System.Drawing.Point(18, 16);
            this.labelPrompt.Name = "labelPrompt";
            this.labelPrompt.Size = new System.Drawing.Size(113, 12);
            this.labelPrompt.TabIndex = 0;
            this.labelPrompt.Text = "请输入要查找的内容";
            // 
            // errorProviderText
            // 
            this.errorProviderText.ContainerControl = this;
            this.errorProviderText.DataMember = "";
            // 
            // InputBox
            // 
            this.AcceptButton = this.buttonOK;
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.CancelButton = this.buttonCancel;
            this.ClientSize = new System.Drawing.Size(407, 126);
            this.Controls.Add(this.labelPrompt);
            this.Controls.Add(this.textBoxText);
            this.Controls.Add(this.buttonCancel);
            this.Controls.Add(this.buttonOK);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "InputBox";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
            this.Text = "查找";
            ((System.ComponentModel.ISupportInitialize)(this.errorProviderText)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

		}
		#endregion

		private void buttonCancel_Click(object sender, System.EventArgs e) {
			this.Validator = null;
			this.Close();
		}

		private void buttonOK_Click(object sender, System.EventArgs e) {
            this.Close();
		}

		/// <summary>
		/// Displays a prompt in a dialog box, waits for the user to input text or click a button.
		/// </summary>
		/// <param name="prompt">String expression displayed as the message in the dialog box</param>
		/// <param name="title">String expression displayed in the title bar of the dialog box</param>
		/// <param name="defaultResponse">String expression displayed in the text box as the default response</param>
		/// <param name="validator">Delegate used to validate the text</param>
		/// <param name="xpos">Numeric expression that specifies the distance of the left edge of the dialog box from the left edge of the screen.</param>
		/// <param name="ypos">Numeric expression that specifies the distance of the upper edge of the dialog box from the top of the screen</param>
		/// <returns>An InputBoxResult object with the Text and the OK property set to true when OK was clicked.</returns>
		public static InputBoxResult Show(string prompt, string title, string defaultResponse, InputBoxValidatingHandler validator, int xpos, int ypos) {
			using (InputBox form = new InputBox()) {
				form.labelPrompt.Text = prompt;
				form.Text = title;
				form.textBoxText.Text = defaultResponse;
				if (xpos >= 0 && ypos >= 0) {
					form.StartPosition = FormStartPosition.Manual;
					form.Left = xpos;
					form.Top = ypos;
				}
				form.Validator = validator;

				DialogResult result = form.ShowDialog();

				InputBoxResult retval = new InputBoxResult();
				if (result == DialogResult.OK) {
					retval.Text = form.textBoxText.Text;
					retval.OK = true;
				}
				return retval;
			}
		}

		/// <summary>
		/// Displays a prompt in a dialog box, waits for the user to input text or click a button.
		/// </summary>
		/// <param name="prompt">String expression displayed as the message in the dialog box</param>
		/// <param name="title">String expression displayed in the title bar of the dialog box</param>
		/// <param name="defaultResponse">String expression displayed in the text box as the default response</param>
		/// <param name="validator">Delegate used to validate the text</param>
		/// <returns>An InputBoxResult object with the Text and the OK property set to true when OK was clicked.</returns>
		public static InputBoxResult Show(string prompt, string title, string defaultText, InputBoxValidatingHandler validator) {
			return Show(prompt, title, defaultText, validator, -1, -1);
		}


		/// <summary>
		/// Reset the ErrorProvider
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void textBoxText_TextChanged(object sender, System.EventArgs e) {
			errorProviderText.SetError(textBoxText, "");
		}

		/// <summary>
		/// Validate the Text using the Validator
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void textBoxText_Validating(object sender, System.ComponentModel.CancelEventArgs e) {
			if (Validator != null) {
				InputBoxValidatingArgs args = new InputBoxValidatingArgs();
				args.Text = textBoxText.Text;
				Validator(this, args);
				if (args.Cancel) {
					e.Cancel = true;
					errorProviderText.SetError(textBoxText, args.Message);
				}
            }
		}

		protected InputBoxValidatingHandler Validator {
			get {
				return (this._validator);
			}
			set {
				this._validator = value;
			}
		}
	}

	/// <summary>
	/// Class used to store the result of an InputBox.Show message.
	/// </summary>
	public class InputBoxResult {
		public bool OK;
		public string Text;
	}

	/// <summary>
	/// EventArgs used to Validate an InputBox
	/// </summary>
	public class InputBoxValidatingArgs : EventArgs {
		public string Text;
		public string Message;
		public bool Cancel;
	}

	/// <summary>
	/// Delegate used to Validate an InputBox
	/// </summary>
	public delegate void InputBoxValidatingHandler(object sender, InputBoxValidatingArgs e);

}