TransformerConfigurationWizardBase.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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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