Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / TransformerConfigurationWizardBase.cs / 1 / TransformerConfigurationWizardBase.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls.WebParts { using System; using System.ComponentModel; using System.Diagnostics; using System.Web.UI.WebControls; internal abstract class TransformerConfigurationWizardBase : Wizard, ITransformerConfigurationControl { private string[] _oldProviderNames; private string[] _oldConsumerNames; private const int baseIndex = 0; private const int oldProviderNamesIndex = 1; private const int oldConsumerNamesIndex = 2; private const int controlStateArrayLength = 3; private static readonly object EventCancelled = new object(); private static readonly object EventSucceeded = new object(); protected abstract PropertyDescriptorCollection ConsumerSchema { get; } protected string[] OldConsumerNames { get { return _oldConsumerNames; } set { _oldConsumerNames = value; } } protected string[] OldProviderNames { get { return _oldProviderNames; } set { _oldProviderNames = value; } } protected abstract PropertyDescriptorCollection ProviderSchema { get; } public event EventHandler Cancelled { add { Events.AddHandler(EventCancelled, value); } remove { Events.RemoveHandler(EventCancelled, value); } } public event EventHandler Succeeded { add { Events.AddHandler(EventSucceeded, value); } remove { Events.RemoveHandler(EventSucceeded, value); } } protected abstract void CreateWizardSteps(); protected internal override void LoadControlState(object savedState) { if (savedState == null) { // Create wizard steps before loading base ControlState. CreateWizardSteps(); base.LoadControlState(null); } else { object[] myState = (object[])savedState; if (myState.Length != controlStateArrayLength) { throw new ArgumentException(SR.GetString(SR.Invalid_ControlState)); } if (myState[oldProviderNamesIndex] != null) { OldProviderNames = (string[])myState[oldProviderNamesIndex]; } if (myState[oldConsumerNamesIndex] != null) { OldConsumerNames = (string[])myState[oldConsumerNamesIndex]; } // Create wizard steps before loading base ControlState. CreateWizardSteps(); base.LoadControlState(myState[baseIndex]); } } protected override void OnCancelButtonClick(EventArgs e) { OnCancelled(EventArgs.Empty); base.OnCancelButtonClick(e); } private void OnCancelled(EventArgs e) { EventHandler handler = (EventHandler)Events[EventCancelled]; if (handler != null) { handler(this, e); } } protected override void OnFinishButtonClick(WizardNavigationEventArgs e) { OnSucceeded(EventArgs.Empty); base.OnFinishButtonClick(e); } protected internal override void OnInit(EventArgs e) { DisplayCancelButton = true; DisplaySideBar = false; if (Page != null) { Page.RegisterRequiresControlState(this); Page.PreRenderComplete += new EventHandler(this.OnPagePreRenderComplete); } base.OnInit(e); } private void OnPagePreRenderComplete(object sender, EventArgs e) { // Copy current schemas into arrays string[] providerNames = ConvertSchemaToArray(ProviderSchema); string[] consumerNames = ConvertSchemaToArray(ConsumerSchema); // If current schemas are not the same as the old schemas, or if the WizardSteps have // not been created yet, update the old schemas and recreate the Wizard steps. if (StringArraysDifferent(providerNames, OldProviderNames) || StringArraysDifferent(consumerNames, OldConsumerNames) || WizardSteps.Count == 0) { OldProviderNames = providerNames; OldConsumerNames = consumerNames; WizardSteps.Clear(); ClearChildState(); CreateWizardSteps(); ActiveStepIndex = 0; } // We should always have at least 1 WizardStep before we Render Debug.Assert(WizardSteps.Count > 0); } private string[] ConvertSchemaToArray(PropertyDescriptorCollection schema) { string[] names = null; if (schema != null && schema.Count > 0) { names = new string[schema.Count * 2]; for (int i=0; i < schema.Count; i++) { PropertyDescriptor descriptor = schema[i]; if (descriptor != null) { names[2*i] = descriptor.DisplayName; names[2*i + 1] = descriptor.Name; } } } return names; } private void OnSucceeded(EventArgs e) { EventHandler handler = (EventHandler)Events[EventSucceeded]; if (handler != null) { handler(this, e); } } protected internal override object SaveControlState() { object[] myState = new object[controlStateArrayLength]; myState[baseIndex] = base.SaveControlState(); myState[oldProviderNamesIndex] = OldProviderNames; myState[oldConsumerNamesIndex] = OldConsumerNames; for (int i=0; i < controlStateArrayLength; i++) { if (myState[i] != null) { return myState; } } // More performant to return null than an array of null values return null; } private bool StringArraysDifferent(string[] arrA, string[] arrB) { int lengthA = (arrA == null) ? 0 : arrA.Length; int lengthB = (arrB == null) ? 0 : arrB.Length; if (lengthA != lengthB) { return true; } else { for (int i=0; i < lengthB; i++) { if (arrA[i] != arrB[i]) { return true; } } } return false; } } }
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