selectionlayerseditor.cs

C#开发的ArcGIS Server9.2地图选择控件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.ComponentModel;
using System.Windows.Forms.Design;
using System.Collections;

namespace SelectToolTask
{
    class SelectionLayersEditor: UITypeEditor
    {
        // Sets up and displays the dialog in Visual Studio, and gets the result
        public override object EditValue(ITypeDescriptorContext context, 
            IServiceProvider provider, object value)
        {
            if ((context != null) && (provider != null))
            {
                System.Web.UI.Control ctrl = context.Instance as System.Web.UI.Control;

                if (ctrl == null)
                    return value;

                // Get layers even when editor is accessed from the task's Properties dialog
                SelectToolTask grSelTask = context.Instance as SelectToolTask;
                string[] allLayers = null;
                string[] invalidServices = null;

                if (grSelTask != null)
                {
                    // Get a list of all queryable layers
                    allLayers = GetLayers(grSelTask, out invalidServices);
                }

                // split selected layers into array (these were passed in as a method argument)
                string[] selectedLayers = null;
                if (!String.IsNullOrEmpty(value as string))
                    selectedLayers = ((string)value).Split(new string[] { "::" }, StringSplitOptions.None);

                SelectionLayerEditorForm form = new SelectionLayerEditorForm(
                    selectedLayers, allLayers, invalidServices);
                    
                if (form.ShowDialog() == DialogResult.OK)
                {
                    selectedLayers = form.SelectableLayers;
                    // join layers into single string
                    value = String.Join("::", selectedLayers);
                }
            }
            return value;
        }

        /// <summary>
        /// Gets the editor style used by the EditValue method
        /// </summary>
        /// <param name="context">An ITypeDescriptorContext that can be used 
        /// to gain additional context information<see cref="System.ComponentModel.ITypeDescriptorContext"/></param>
        /// <returns>If the context is not null, the Style will 
        /// always be returned as Modal, otherwise will return a default edit style</returns>
        public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
        {
            if (context != null)
            {
                return UITypeEditorEditStyle.Modal;
            }
            return base.GetEditStyle(context);
        }

        // Gets a list of queryable layers associated with the Map control used in the task
        private string[] GetLayers(SelectToolTask grSelTask,
            out string[] invalidServices)
        {
            string[] layers = null;
            invalidServices = new string[0];
            string idStringDelim = "___";
            ESRI.ArcGIS.ADF.Web.UI.WebControls.Map mapControl =
                Utilities.FindControlRecursive(grSelTask.Page, grSelTask.Map) 
                    as ESRI.ArcGIS.ADF.Web.UI.WebControls.Map;
            // if Map property is null/blank, find first Map control on Page
            if (mapControl == null)
            {
                List<System.Web.UI.Control> maps = Utilities.FindControls(
                    typeof(ESRI.ArcGIS.ADF.Web.UI.WebControls.Map), grSelTask.Page.Controls);
                if (maps.Count > 0)
                    mapControl = maps[0] as ESRI.ArcGIS.ADF.Web.UI.WebControls.Map;
            }

            if (mapControl != null)
            {
                // get layers, also any invalid resources
                System.Web.UI.WebControls.ListItem[] lyrItems = 
                    Utilities.GetQueryLayers(mapControl, null,
                        idStringDelim, out invalidServices);
                layers = new string[lyrItems.Length];
                for (int i = 0; i < lyrItems.Length; i++)
                    layers[i] = lyrItems[i].Text;
            }

            return layers;
        }
    }
}