dialogmessagebox.cs

一个非常好的Web自定义控件

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections.Specialized;
using System.Text;
using System.Reflection;
using System.ComponentModel;

namespace MetaBuilders.WebControls {

	/// <summary>
	/// Provides an interface similar to the Windows.Forms.MessageBox.
	/// Call <see cref="DialogWindowBase.Open"/> to display the MessageBox dialog window, or point a <see cref="DialogOpenButton"/> at it.
	/// </summary>
	/// <remarks>
	/// <p>The DialogMessageBox control requires a custom httpHandler setting in the application web.config file. To do this, add the following line to the httpHandlers section of your web.config file</p>
	/// <code>
	/// &lt;add verb="*" 
	/// path="MetaBuilders_DialogWindow.axd" 
	/// type="MetaBuilders.WebControls.DialogHandlerFactory,MetaBuilders.WebControls.DialogWindow" 
	/// validate="false"/&gt;</code>
	/// <p>
	/// The DialogMessageBox control requires javascript support in order to function.
	/// </p>
	/// </remarks>
	/// <example>
	/// The following example shows you how to use the <see cref="DialogMessageBox"/> on your page.
	/// <code>
	/// <![CDATA[
	/// <%@ Register TagPrefix="mbdw" Namespace="MetaBuilders.WebControls" Assembly="MetaBuilders.WebControls.DialogWindow" %>
	/// <script runat="server" language="c#" >
	/// protected void MyDialogWindow_DialogClosed( Object sender, DialogResultEventArgs e ) {
	///		Entry.Text = e.Results;
	/// }
	/// </script>
	/// <form runat="server">
	///		<asp:TextBox runat="server" Id="Entry" />
	///		<mbdw:DialogMessageBox runat="server" Id="MyMessageBox" 
	///			OnDialogClosed="MyDialogWindow_DialogClosed" 
	///			Prompt="What Is Your Answer?" />
	///		<mbdw:DialogOpenButton runat="server" 
	///			DialogToOpen="MyMessageBox" 
	///			Text="Open A MessageBox" />
	/// </form>
	/// ]]>
	/// </code>
	/// </example>
	public class DialogMessageBox : DialogWindowBase {

		#region Properties

		/// <summary>
		/// Gets or sets the main text of the messagebox.
		/// </summary>
		[
		Description("Gets or sets the main text of the messagebox."),
		Category("Dialog"),
		DefaultValue(""),
		Bindable(true),
		]
		public virtual String Prompt {
			get {
				Object savedState = this.ViewState["Prompt"];
				if ( savedState != null ) {
					return (String)savedState;
				}
				return "";
			}
			set {
				this.ViewState["Prompt"] = value;
			}
		}

		/// <summary>
		/// Gets or sets the title of the messagebox window.
		/// </summary>
		[
		Description("Gets or sets the title of the messagebox window."),
		Category("Dialog"),
		DefaultValue(""),
		Bindable(true),
		]
		public virtual String Title {
			get {
				Object savedState = this.ViewState["Title"];
				if ( savedState != null ) {
					return (String)savedState;
				}
				return "";
			}
			set {
				this.ViewState["Title"] = value;
			}
		}

		/// <summary>
		/// Gets or sets the buttons of the messagebox.
		/// </summary>
		[
		Description("Gets or sets the buttons of the messagebox."),
		Category("Dialog"),
		DefaultValue(DialogMessageBoxButtons.OKCancel),
		Bindable(true),
		]
		public virtual DialogMessageBoxButtons Buttons {
			get {
				Object savedState = this.ViewState["Buttons"];
				if ( savedState != null ) {
					return (DialogMessageBoxButtons)savedState;
				}
				return DialogMessageBoxButtons.OKCancel;
			}
			set {
				if ( !Enum.IsDefined(typeof(DialogMessageBoxButtons),value) ) {
					throw new ArgumentOutOfRangeException("value");
				}
				this.ViewState["Buttons"] = value;
			}
		}

		/// <summary>
		/// Gets or sets the buttons of the messagebox.
		/// </summary>
		[
		Description("Gets or sets the buttons of the messagebox."),
		Category("Dialog"),
		DefaultValue(DialogMessageBoxIcon.None),
		Bindable(true),
		]
		public virtual DialogMessageBoxIcon Icon {
			get {
				Object savedState = this.ViewState["Icon"];
				if ( savedState != null ) {
					return (DialogMessageBoxIcon)savedState;
				}
				return DialogMessageBoxIcon.None;
			}
			set {
				if ( !Enum.IsDefined(typeof(DialogMessageBoxIcon),value) ) {
					throw new ArgumentOutOfRangeException("value");
				}
				this.ViewState["Icon"] = value;
			}
		}
		#endregion

		/// <summary>
		/// Generates the script neccessary to open the current messagebox.
		/// </summary>
		/// <remarks>
		/// <p>Calling <see cref="DialogWindowBase.Open"/> will cause this script to be sent to the client browser.</p>
		/// <p>This method can also be used to open the messagebox on the client without postingback.</p>
		/// <p>This method is only public for developers who want to customize how and when the window is opened via code or a custom server control.</p>
		/// </remarks>
		public override String GetDialogOpenScript() {

			DialogHandlerFactory.EnsureHandlerFactory();
			StringBuilder url = new StringBuilder();
			url.Append( "~/" );
			url.Append(DialogHandlerFactory.HandlerName);
			url.Append("?");
			url.Append(DialogHandlerFactory.HandlerNameKey);
			url.Append("=DialogMessageBoxPage");
			url.Append("&prompt=");
			url.Append(HttpUtility.UrlEncode(this.Prompt));
			if ( this.Title != null && this.Title.Length > 0 ) {
				url.Append("&title=");
				url.Append(HttpUtility.UrlEncode(this.Title));
			}
			url.Append("&icon=");
			url.Append(this.Icon.ToString());
			url.Append("&buttons=");
			url.Append(this.Buttons.ToString());
			String finalUrl = this.ResolveUrl(url.ToString());

			NameValueCollection features = this.GetStandardFeatures();
			Int32 windowHeight = 125;
			if ( this.Prompt.Length > 80 ) {
				Int32 overLength = this.Prompt.Length - 80;
				windowHeight += ( ( ( overLength / 40 ) + 1 ) * 25 );
			}
			features["height"] = windowHeight.ToString();
			features["innerHeight"] = windowHeight.ToString();
			features["width"] = "300";
			features["innerWidth"] = "300";

			return this.GetDialogOpenScript(finalUrl,features);
		}


	}

}