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//------------------------------------------------------------------------------
// <copyright file="RowToFieldTransformer.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls.WebParts {
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Web.UI.WebControls;
[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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