wroxtoolbardesigner.cs

ASP.NET服务器控件高级编程电子书

using System;
using System.IO;
using System.Drawing;
using System.Web.UI;
using System.Web.UI.Design;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;

namespace  WroxDesign.Design
{
	public class WroxToolBarDesigner : ControlDesigner
	{
		public override DesignerVerbCollection Verbs
		{
			get 
			{
				DesignerVerb[] verbs = new DesignerVerb[] {
					new DesignerVerb("Wrox Format...", new System.EventHandler(OnWroxFormat)),
					new DesignerVerb("Edit Buttons...", new System.EventHandler(OnEditButtons))};
				return new DesignerVerbCollection(verbs); 
			}
		}

		public void OnWroxFormat(object sender, EventArgs e)
		{
			WroxToolBar wb = Component as WroxToolBar;
			//Apply a formatting style.
			wb.BackColor = Color.LightSkyBlue;
			wb.BorderColor = Color.Black;
			wb.Font.Name = "Tahoma";
			wb.Font.Size = new FontUnit("8pt");
			wb.ForeColor = Color.White;
			wb.BorderStyle = BorderStyle.Solid;
			wb.BorderWidth = new Unit(1, UnitType.Point);
			//Notify the environment we have changed the component.
			RaiseComponentChanged(null, null, null);
			UpdateDesignTimeHtml();
		}
		
		public void OnEditButtons(object sender, EventArgs e)
		{
			WroxToolBar wb = Component as WroxToolBar;
			WroxToolBarButtonsForm form = new WroxToolBarButtonsForm(wb.Buttons);

			if (form.ShowDialog() == System.Windows.Forms.DialogResult.OK)
			{
				wb.Buttons = form.Buttons;
				RaiseComponentChanged(null, null, null);
				UpdateDesignTimeHtml();
			}
		}

		private void TransferAttributes(WebControl source, WebControl destination)
		{
			destination.CopyBaseAttributes(source);
			destination.Style.Remove("POSITION");
			destination.Style.Remove("LEFT");
			destination.Style.Remove("TOP");
			destination.Font.CopyFrom(source.Font);
			destination.BackColor = source.BackColor;
			destination.BorderColor = source.BorderColor;
			destination.ForeColor = source.ForeColor;
		}

		public override string GetPersistInnerHtml()
		{
			StringWriter text = new StringWriter();
			HtmlTextWriter writer = new HtmlTextWriter(text);

			WroxToolBar tbr = Component as WroxToolBar;

			writer.WriteFullBeginTag("buttons");
			foreach (WroxButton btn in tbr.Buttons)
			{
				//We won't persist other attributes, which will be copied 
				//from the toolbar settings.
				writer.WriteBeginTag("button");
				writer.WriteAttribute("ID", btn.ID);
				writer.WriteAttribute("Text", btn.Text);
				writer.WriteAttribute("ImageUrl", btn.ImageUrl);
				writer.Write(" />");
			}
			writer.WriteEndTag("buttons");            
			return text.ToString();
		}
		
		public override string GetDesignTimeHtml()
		{
			try
			{
				WroxToolBar wb = (WroxToolBar) base.Component;
				if (wb.Buttons.Count == 0)
					return GetEmptyDesignTimeHtml();
				//Returns just the same runtime layout.
				return base.GetDesignTimeHtml();
			}
			catch (Exception e)
			{
				return GetErrorDesignTimeHtml(e);
			}
		}
	
		protected override string GetEmptyDesignTimeHtml() 
		{
			//Render design time warning if there's nothing to display.
			string text= "Please add WroxButtons to the toolbar.";
			return CreatePlaceHolderDesignTimeHtml(text);
		}

		protected override string GetErrorDesignTimeHtml(Exception e)
		{
			string text = string.Format("{0}{1}{2}{3}", 
				"There was an error and the control can't be displayed.",
				"<BR>", "Exception: ", e.Message);

			return CreatePlaceHolderDesignTimeHtml(text);
		}

	}
}