Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / RowToFieldTransformer.cs / 1 / RowToFieldTransformer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls.WebParts { using System; using System.ComponentModel; using System.Diagnostics; using System.Security.Permissions; using System.Web.UI.WebControls; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [WebPartTransformer(typeof(IWebPartRow), typeof(IWebPartField))] public sealed class RowToFieldTransformer : WebPartTransformer, IWebPartField { private IWebPartRow _provider; private string _fieldName; // We know there is only 1 RowCallback, since transformers can only have 1 consumer private FieldCallback _callback; public override Control CreateConfigurationControl() { return new RowToFieldConfigurationWizard(this); } public string FieldName { get { return (_fieldName != null) ? _fieldName : String.Empty; } set { _fieldName = value; } } private PropertyDescriptorCollection ProviderSchema { get { return (_provider != null) ? _provider.Schema : null; } } private void GetRowData(object rowData) { Debug.Assert(_callback != null); object fieldValue = null; if (rowData != null) { PropertyDescriptor prop = ((IWebPartField)this).Schema; if (prop != null) { fieldValue = prop.GetValue(rowData); } } _callback(fieldValue); } protected internal override void LoadConfigurationState(object savedState) { _fieldName = (string)savedState; } protected internal override object SaveConfigurationState() { return _fieldName; } public override object Transform(object providerData) { _provider = (IWebPartRow)providerData; return this; } #region Implementation of IWebPartField void IWebPartField.GetFieldValue(FieldCallback callback) { if (callback == null) { throw new ArgumentNullException("callback"); } if (_provider != null) { _callback = callback; _provider.GetRowData(new RowCallback(GetRowData)); } else { callback(null); } } PropertyDescriptor IWebPartField.Schema { get { PropertyDescriptorCollection schema = ProviderSchema; return (schema != null) ? schema.Find(FieldName, /* ignoreCase */ true) : null; } } #endregion private sealed class RowToFieldConfigurationWizard : TransformerConfigurationWizardBase { private DropDownList _fieldName; private RowToFieldTransformer _owner; private const string fieldNameID = "FieldName"; public RowToFieldConfigurationWizard(RowToFieldTransformer owner) { Debug.Assert(owner != null); _owner = owner; } // Dummy consumer schema protected override PropertyDescriptorCollection ConsumerSchema { get { return null; } } protected override PropertyDescriptorCollection ProviderSchema { get { return _owner.ProviderSchema; } } protected override void CreateWizardSteps() { // The WizardSteps should be empty when this is called Debug.Assert(WizardSteps.Count == 0); WizardStep s = new WizardStep(); _fieldName = new DropDownList(); _fieldName.ID = fieldNameID; if (OldProviderNames != null) { for (int i=0; i < OldProviderNames.Length / 2; i++) { ListItem item = new ListItem(OldProviderNames[2*i], OldProviderNames[2*i + 1]); // Ignore case when setting selected value, since we ignore case when // returing the connection data. (VSWhidbey 434566) if (String.Equals(item.Value, _owner.FieldName, StringComparison.OrdinalIgnoreCase)) { item.Selected = true; } _fieldName.Items.Add(item); } } else { _fieldName.Items.Add(new ListItem(SR.GetString(SR.RowToFieldTransformer_NoProviderSchema))); _fieldName.Enabled = false; } Label fieldNameLabel = new Label(); fieldNameLabel.Text = SR.GetString(SR.RowToFieldTransformer_FieldName); fieldNameLabel.AssociatedControlID = _fieldName.ID; s.Controls.Add(fieldNameLabel); s.Controls.Add(new LiteralControl(" ")); s.Controls.Add(_fieldName); WizardSteps.Add(s); } protected override void OnFinishButtonClick(WizardNavigationEventArgs e) { Debug.Assert(_fieldName != null); string selectedFieldName = null; if (_fieldName.Enabled) { selectedFieldName = _fieldName.SelectedValue; } _owner.FieldName = selectedFieldName; base.OnFinishButtonClick(e); } } } }
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