XhtmlBasicSelectionListAdapter.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / Adapters / XhtmlAdapters / XhtmlBasicSelectionListAdapter.cs / 1305376 / XhtmlBasicSelectionListAdapter.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.Globalization; 
using System.Security.Permissions;
using System.Web.UI; 
using System.Collections.Specialized;
using System.Web.UI.MobileControls;
using System.Web.UI.MobileControls.Adapters;
using System.Text.RegularExpressions; 
using System.Text;
 
#if COMPILING_FOR_SHIPPED_SOURCE 
namespace System.Web.UI.MobileControls.ShippedAdapterSource.XhtmlAdapters
#else 
namespace System.Web.UI.MobileControls.Adapters.XhtmlAdapters
#endif
{
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")] 
    public class XhtmlSelectionListAdapter : XhtmlControlAdapter {
 
        /// 
        protected new SelectionList Control {
            get {
                return base.Control as SelectionList; 
            }
        } 
 
        /// 
        public override void Render(XhtmlMobileTextWriter writer) { 
            // Assumption: XhtmlBasic devices all support tables (conforming to spec).

            if (Control.Items.Count == 0) {
                return; 
            }
 
 
            if ((String) Device[XhtmlConstants.RequiresOnEnterForward] == "true") {
                AddOnEnterForward(writer); 
            }

            int selectedIndex = Control.SelectedIndex;
 
            switch(Control.SelectType) {
                case ListSelectType.DropDown: 
                case ListSelectType.ListBox: 
                case ListSelectType.MultiSelectListBox:
                    RenderSelectElement (writer); 
                    break;

                case ListSelectType.Radio:
                case ListSelectType.CheckBox: 
                    RenderInputElementSet (writer);
                    break; 
            } 
        }
 
        private void AddOnEnterForward(XhtmlMobileTextWriter writer) {
            if (Control.SelectType == ListSelectType.CheckBox) {
                // ASURT 142732
                writer.AddOnEnterForwardSetVar(Control.UniqueID); 
                return;
            } 
            bool firstIndex = true; 
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < Control.Items.Count; i++) { 
                if (Control.Items[i].Selected) {
                    if (!firstIndex) {
                        builder.Append(";");
                    } 
                    builder.Append(i.ToString(CultureInfo.InvariantCulture));
                    firstIndex = false; 
                } 
            }
            writer.AddOnEnterForwardSetVar(Control.UniqueID, builder.ToString()); 
        }

        /// 
        public override bool LoadPostData (String key, 
            NameValueCollection data,
            Object controlPrivateData, 
            out bool dataChanged) { 
            String[] selectedItems = data.GetValues(key);
 
            // If no post data is included, and the control is either not visible, or
            // not on active form, this call should be ignored (the lack of post data
            // is not due to there being no selection, but due to there being no
            // markup rendered that could generate the post data). 
            if (selectedItems == null &&
                (!Control.Visible || Control.Form != Control.MobilePage.ActiveForm)) { 
                dataChanged = false; 
                return true;
            } 

            // Case where nothing is selected.
            if(selectedItems == null ||
                (selectedItems.Length == 1 && (selectedItems[0] == null || selectedItems[0].Length == 0))) { 
                selectedItems = new String[] {};
            } 
 
            // multiselect case with more than one selection.
            if(selectedItems.Length == 1 && selectedItems[0].IndexOf(';') > -1) { 
                String selected = selectedItems[0];
                // Eliminate trailing semicolon, if there is one.
                selected = Regex.Replace(selected, ";$", "");
                selectedItems = Regex.Split(selected, ";"); 
            }
 
            int[] selectedItemIndices = new int[selectedItems.Length]; 

            // Note: controlPrivateData is selected indices from the viewstate. 
            int[] originalSelectedIndices = (int[])controlPrivateData;
            dataChanged = false;

            // If SelectType is DropDown && nothing was selected, select 
            // first elt.  (Non-mobile DropDown does same by getting SelectedIndex).
            if(Control.SelectType == ListSelectType.DropDown && 
                originalSelectedIndices.Length == 0 && 
                Control.Items.Count > 0) {
                Control.Items[0].Selected = true; 
                originalSelectedIndices = new int[]{0};
            }

            for(int i = 0; i < selectedItems.Length; i++) { 
                selectedItemIndices[i] = Int32.Parse(selectedItems[i], CultureInfo.InvariantCulture);
            } 
 
            // Do not assume posted selected indices are ascending.
            // We do know originalSelectedIndices are ascending. 
            Array.Sort(selectedItemIndices);

            // Check whether selections have changed.
            if(selectedItemIndices.Length != originalSelectedIndices.Length) { 
                dataChanged = true;
            } 
            else { 
                for(int i = 0; i < selectedItems.Length; i++) {
                    if(selectedItemIndices[i] != originalSelectedIndices[i]) { 
                        dataChanged = true;
                    }
                }
            } 

            for (int i = 0; i < Control.Items.Count; i++) { 
                Control.Items[i].Selected = false; 
            }
 
            for(int i = 0; i < selectedItemIndices.Length; i++) {
                Control.Items[selectedItemIndices[i]].Selected = true;
            }
            return true; 
        }
 
 
        void RenderInputElementSet (XhtmlMobileTextWriter writer) {
            string wrappingTag = Device.Tables ? "table" : 
                (((string)Device["usePOverDiv"]  == "true") ? "p" : "div");
            ListSelectType selectType = Control.SelectType;
            MobileListItemCollection items = Control.Items;
            // Review: We always render a table.  Should we optimize away the table tags when the alignment is left? 
            String selectTypeString =
                (selectType == ListSelectType.Radio) ? 
                "radio" : 
                "checkbox";
 
            ClearPendingBreakIfDeviceBreaksOnBlockLevel(writer); // Since we are writing a block-level element in all cases.
            ConditionalEnterLayout(writer, Style);
            RenderOpeningListTag(writer, wrappingTag);
            for(int itemIndex = 0; itemIndex < items.Count; itemIndex++) { 
                MobileListItem item = items[itemIndex];
                if (Device.Tables) { 
                    writer.WriteFullBeginTag("tr"); 
                    writer.WriteFullBeginTag("td");
                } 

                writer.WriteBeginTag("input");
                writer.WriteAttribute("type", selectTypeString);
                writer.WriteAttribute("name", Control.UniqueID); 
                WriteItemValueAttribute(writer, itemIndex, item.Value);
                String accessKey = GetCustomAttributeValue(item, XhtmlConstants.AccessKeyCustomAttribute); 
                if (accessKey != null && accessKey.Length > 0) { 
                    writer.WriteAttribute("accesskey", accessKey, true);
                } 
                // Assumption: Device.SupportsUncheck is always true for Xhtml devices.
                if (item.Selected &&
                    (Control.IsMultiSelect || itemIndex == Control.SelectedIndex)) {
                    writer.Write(" checked=\"checked\"/>"); 
                }
                else { 
                    writer.Write("/>"); 
                }
 
                writer.WriteEncodedText(item.Text);
                if (Device.Tables) {
                    writer.WriteEndTag("td");
                } 
                if((string)Device["usePOverDiv"]  == "true" || !Device.Tables) {
                    writer.Write("
"); } if (Device.Tables) { writer.WriteEndTag("tr"); } } RenderClosingListTag(writer, wrappingTag); ConditionalExitLayout(writer, Style); } void RenderSelectElement (XhtmlMobileTextWriter writer) { if ((String)Device["supportsSelectFollowingTable"] == "false" && writer.CachedEndTag == "table") { writer.Write(" "); } ConditionalEnterStyle(writer, Style); writer.WriteBeginTag ("select"); if (Control.SelectType == ListSelectType.MultiSelectListBox) { writer.WriteAttribute ("multiple", "multiple"); } if (Control.SelectType == ListSelectType.ListBox || Control.SelectType == ListSelectType.MultiSelectListBox) { writer.WriteAttribute ("size", Control.Rows.ToString(CultureInfo.InvariantCulture)); } writer.WriteAttribute ("name", Control.UniqueID); ConditionalRenderClassAttribute(writer); writer.Write (">"); for (int itemIndex = 0; itemIndex < Control.Items.Count; itemIndex++) { MobileListItem item = Control.Items[itemIndex]; writer.WriteBeginTag ("option"); WriteItemValueAttribute (writer, itemIndex, item.Value); if (item.Selected && (Control.IsMultiSelect || itemIndex == Control.SelectedIndex)) { writer.Write (" selected=\"selected\">"); } else { writer.Write (">"); } writer.WriteEncodedText (item.Text); writer.WriteLine (""); } ConditionalSetPendingBreak(writer); writer.WriteEndTag ("select"); writer.WriteLine (); ConditionalPopPhysicalCssClass(writer); ConditionalExitStyle(writer, Style); } private void WriteItemValueAttribute (XhtmlMobileTextWriter writer, int index, String value) { String controlFormAction = Control.Form.Action; if (controlFormAction == null || controlFormAction.Length == 0) { writer.WriteAttribute ("value", index.ToString(CultureInfo.InvariantCulture)); } else { writer.WriteAttribute ("value", value, true /*encode*/); } } /// protected override void RenderAsHiddenInputField(XhtmlMobileTextWriter writer) { // Optimization - if viewstate is enabled for this control, and the // postback returns to this page, we just let it do the trick. // One catch though - if the control is multiselect, it always // interprets return values, so we do need to write out. if (Control.IsMultiSelect || Control.Form.Action.Length > 0 || !IsViewStateEnabled()) { String uniqueID = Control.UniqueID; MobileListItemCollection items = Control.Items; for (int i = 0; i < items.Count; i++) { if (items[i].Selected) { writer.WriteHiddenField(uniqueID, i.ToString(CultureInfo.InvariantCulture)); } } } } private bool IsViewStateEnabled() { Control ctl = Control; while (ctl != null) { if (!ctl.EnableViewState) { return false; } ctl = ctl.Parent; } return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK