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//------------------------------------------------------------------------------
// <copyright file="TransformerConfigurationWizardBase.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;
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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