FlowSwitchLink.cs source code in C# .NET

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                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Core.Presentation / System / Activities / Core / Presentation / FlowSwitchLink.cs / 1407647 / FlowSwitchLink.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Activities.Core.Presentation 
{
    using System; 
    using System.Activities.Presentation; 
    using System.Activities.Presentation.Model;
    using System.Activities.Presentation.View; 
    using System.Activities.Statements;
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Windows; 
    using System.Runtime;
    using System.Collections.Generic; 
    using System.Windows.Data; 
    using System.Globalization;
    using System.Activities.Presentation.PropertyEditing; 
    using System.Activities.Presentation.Internal.PropertyEditing.Model;

    sealed class FlowSwitchLink : DependencyObject, IFlowSwitchLink
    { 
        static DependencyProperty caseProperty = DependencyProperty.Register("Case", typeof(T), typeof(FlowSwitchLink), new FrameworkPropertyMetadata(new PropertyChangedCallback(FlowSwitchLink.OnCasePropertyChanged)));
        static DependencyProperty isDefaultCaseProperty = DependencyProperty.Register("IsDefault", typeof(bool), typeof(FlowSwitchLink), new FrameworkPropertyMetadata(new PropertyChangedCallback(FlowSwitchLink.OnIsDefaultCasePropertyChanged))); 
 
        private FlowSwitch parentFlowSwitch;
        bool internalChange = false; 
        ModelItem flowSwitchModelItem;
        const string DefaultConnectorViewStateKey = "Default";
        const string CaseViewStateKeyAppendString = "Connector";
        bool internalDefaultCaseChange = false; 

        public FlowSwitchLink(ModelItem flowSwitchMI, T caseValue, bool isDefault) 
        { 
            flowSwitchModelItem = flowSwitchMI;
            object flowSwitch = flowSwitchModelItem.GetCurrentValue(); 
            parentFlowSwitch = (FlowSwitch)flowSwitchModelItem.GetCurrentValue();
            this.internalChange = true;
            this.internalDefaultCaseChange = true;
            if (!isDefault) 
            {
                this.CaseObject = caseValue; 
            } 
            this.IsDefaultCase = isDefault;
            this.internalDefaultCaseChange = false; 
            this.internalChange = false;
        }

        [BrowsableAttribute(false)] 
        public ModelItem ModelItem
        { get; set; } 
 
        public CaseKeyValidationCallbackDelegate ValidateCaseKey
        { 
            get
            {
                return (object obj, out string reason) =>
                { 
                    return GenericFlowSwitchHelper.ValidateCaseKey(obj,
                        flowSwitchModelItem.Properties["Cases"], 
                        typeof(T), 
                        out reason);
                }; 
            }
        }

        [BrowsableAttribute(false)] 
        public FlowNode ParentFlowSwitch
        { 
            get 
            {
                return this.parentFlowSwitch; 
            }
            set
            {
                this.parentFlowSwitch = value as FlowSwitch; 
            }
        } 
 
        public bool IsDefaultCase
        { 
            get
            {
                return (bool) GetValue(FlowSwitchLink.isDefaultCaseProperty);
            } 
            set
            { 
                SetValue(FlowSwitchLink.isDefaultCaseProperty, value); 
            }
        } 

        [Browsable(false)]
        public string CaseName
        { 
            get
            { 
               object value = GetValue(FlowSwitchLink.caseProperty); 
               return GenericFlowSwitchHelper.GetString((T)value, typeof(T));
            } 
        }

        [Browsable(false)]
        public object CaseObject 
        {
            get 
            { 
                return GetValue(FlowSwitchLink.caseProperty);
            } 
            set
            {
                SetValue(FlowSwitchLink.caseProperty, value);
            } 
        }
 
 
        public T Case
        { 
            get
            {
                return (T) GetValue(FlowSwitchLink.caseProperty);
            } 
            set
            { 
                SetValue(FlowSwitchLink.caseProperty, value); 
            }
        } 

        public DependencyProperty CaseProperty
        {
            get 
            {
                return caseProperty; 
            } 
        }
 
        public DependencyProperty IsDefaultCaseProperty
        {
            get
            { 
                return isDefaultCaseProperty;
            } 
        } 

        [Browsable(false)] 
        public Type GenericType
        {
            get
            { 
                return typeof(T);
            } 
        } 

        bool ContainsKey(object key) 
        {
            return this.parentFlowSwitch.Cases.ContainsKey((T)key);
        }
 
        void OnIsDefaultPropertyChanged(DependencyPropertyChangedEventArgs e)
        { 
            bool isUndoRedoInProgress; 
            FlowSwitchDesigner designer = ((FlowSwitchDesigner)((FlowSwitchDesigner)this.flowSwitchModelItem.View));
            if (designer == null) 
            {
                isUndoRedoInProgress = false;
            }
            else 
            {
                isUndoRedoInProgress = designer.Context.Services.GetService().IsUndoRedoInProgress; 
            } 

            if (!this.internalDefaultCaseChange && !isUndoRedoInProgress) 
            {
                bool value = (bool)e.NewValue;
                bool oldValue = (bool)e.OldValue;
 
                if (value)
                { 
                    if (object.Equals(flowSwitchModelItem.Properties["Default"].Value, null)) 
                    {
                        using (EditingScope es = (EditingScope)flowSwitchModelItem.BeginEdit(SR.FlowSwitchCaseRenameEditingScopeDesc)) 
                        {
                            ModelItem flowNodeMI = GenericFlowSwitchHelper.GetCaseModelItem(flowSwitchModelItem.Properties["Cases"], this.CaseObject);
                            GenericFlowSwitchHelper.RemoveCase(flowSwitchModelItem.Properties["Cases"], this.CaseObject);
                            flowSwitchModelItem.Properties["Default"].SetValue(flowNodeMI); 
                            UpdateViewState(this.CaseName + CaseViewStateKeyAppendString, DefaultConnectorViewStateKey);
                            this.internalChange = true; 
                            es.Complete(); 
                        }
                    } 
                    else
                    {
                        internalDefaultCaseChange = true;
                        this.IsDefaultCase = oldValue; 
                        throw FxTrace.Exception.AsError(new InvalidOperationException(SR.DefaultCaseExists));
                    } 
                } 
                else
                { 
                    if (oldValue)
                    {
                        using (EditingScope es = (EditingScope)flowSwitchModelItem.BeginEdit(SR.FlowSwitchCaseRenameEditingScopeDesc))
                        { 
                            ModelItem defaultCase = flowSwitchModelItem.Properties["Default"].Value;
                            object uniqueCase = null; 
                            string errorMessage = string.Empty; 
                            Type typeArgument = typeof(T);
                            if (GenericFlowSwitchHelper.CanBeGeneratedUniquely(typeArgument)) 
                            {
                                string caseName = GenericFlowSwitchHelper.GetCaseName(flowSwitchModelItem.Properties["Cases"], typeArgument, out errorMessage);
                                if (!string.IsNullOrEmpty(errorMessage))
                                { 
                                    internalDefaultCaseChange = true;
                                    this.IsDefaultCase = oldValue; 
                                    throw FxTrace.Exception.AsError(new InvalidOperationException(errorMessage)); 
                                }
                                uniqueCase = GenericFlowSwitchHelper.GetObject(caseName, typeArgument); 

                            }
                            else
                            { 
                                FlowSwitchCaseEditorDialog editor = new FlowSwitchCaseEditorDialog(this.flowSwitchModelItem, ((FlowSwitchDesigner)this.flowSwitchModelItem.View).Context, ((FlowSwitchDesigner)this.flowSwitchModelItem.View), SR.ChangeCaseValue, this.flowSwitchModelItem.ItemType.GetGenericArguments()[0]);
                                editor.WindowSizeToContent = SizeToContent.WidthAndHeight; 
 
                                if (!editor.ShowOkCancel())
                                { 
                                    internalDefaultCaseChange = true;
                                    this.IsDefaultCase = oldValue;
                                    return;
                                } 
                                uniqueCase = editor.Case;
                                if (GenericFlowSwitchHelper.ContainsCaseKey(this.flowSwitchModelItem.Properties["Cases"], uniqueCase)) 
                                { 
                                    internalDefaultCaseChange = true;
                                    this.IsDefaultCase = oldValue; 
                                    throw FxTrace.Exception.AsError(new InvalidOperationException(SR.InvalidFlowSwitchCaseMessage));
                                }
                            }
 
                            flowSwitchModelItem.Properties["Default"].SetValue(null);
                            this.internalChange = true; 
                            if (typeof(string) != typeof(T)) 
                            {
                                this.ModelItem.Properties["Case"].SetValue(uniqueCase); 
                                GenericFlowSwitchHelper.AddCase(this.flowSwitchModelItem.Properties["Cases"], uniqueCase, defaultCase.GetCurrentValue());
                            }
                            else
                            { 
                                this.ModelItem.Properties["Case"].SetValue(uniqueCase);
                                GenericFlowSwitchHelper.AddCase(this.flowSwitchModelItem.Properties["Cases"], uniqueCase, defaultCase.GetCurrentValue()); 
                            } 
                            UpdateViewState(DefaultConnectorViewStateKey, GenericFlowSwitchHelper.GetString(uniqueCase, typeof(T)) + CaseViewStateKeyAppendString);
                            es.Complete(); 
                            this.internalChange = false;
                        }
                        this.internalDefaultCaseChange = false;
                    } 
                }
            } 
            this.internalDefaultCaseChange = false; 
        }
 
        void OnCasePropertyChanged(DependencyPropertyChangedEventArgs e)
        {
            bool isUndoRedoInProgress;
            FlowSwitchDesigner designer = ((FlowSwitchDesigner)this.flowSwitchModelItem.View); 
            if (designer == null)
            { 
                isUndoRedoInProgress = false; 
            }
            else 
            {
                isUndoRedoInProgress = designer.Context.Services.GetService().IsUndoRedoInProgress;
            }
 
            if (!internalChange && !isUndoRedoInProgress)
            { 
                    T oldValue = (T)e.OldValue; 
                    T newValue = (T)e.NewValue;
 
                    if (newValue is string && newValue != null)
                    {
                        newValue = (T) ((object)((string)((object)newValue)).Trim());
                    } 

                    string oldViewStateKey = string.Empty; 
                    if (!ContainsKey(newValue)) 
                    {
                        using (EditingScope es = (EditingScope)flowSwitchModelItem.BeginEdit(SR.FlowSwitchCaseRenameEditingScopeDesc)) 
                        {
                            ModelItem flowElementMI = null;

                            flowElementMI = GenericFlowSwitchHelper.GetCaseModelItem(flowSwitchModelItem.Properties["Cases"], oldValue); 
                            GenericFlowSwitchHelper.RemoveCase(flowSwitchModelItem.Properties["Cases"], oldValue);
                            oldViewStateKey = GenericFlowSwitchHelper.GetString(oldValue, typeof(T)) + CaseViewStateKeyAppendString; 
                            //Add the new value 
                            GenericFlowSwitchHelper.AddCase(flowSwitchModelItem.Properties["Cases"], newValue, flowElementMI.GetCurrentValue());
                            //Update the viewstate for the flowswitch. 
                            UpdateViewState(oldViewStateKey, GenericFlowSwitchHelper.GetString(newValue, typeof(T)) + CaseViewStateKeyAppendString);
                            //Making sure the value for Case is always trimmed.
                            internalChange = true;
                            this.ModelItem.Properties["Case"].SetValue(newValue); 
                            es.Complete();
                        } 
                    } 
                    else
                    { 
                        internalChange = true;
                        this.CaseObject = oldValue;
                        throw FxTrace.Exception.AsError(new InvalidOperationException(SR.InvalidFlowSwitchCaseMessage));
                    } 
             }
            internalChange = false; 
        } 

        void UpdateViewState(string oldValue, string newValue) 
        {
            EditingContext context = flowSwitchModelItem.GetEditingContext();
            ViewStateService viewStateService = (ViewStateService)context.Services.GetService(typeof(ViewStateService));
            if (viewStateService != null) 
            {
                object viewState = viewStateService.RetrieveViewState(flowSwitchModelItem, oldValue); 
                if (viewState != null) 
                {
                    viewStateService.StoreViewStateWithUndo(flowSwitchModelItem, oldValue, null); 
                    viewStateService.StoreViewStateWithUndo(flowSwitchModelItem, newValue, viewState);
                }
            }
        } 

        static void OnCasePropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) 
        { 
            FlowSwitchLink link = (FlowSwitchLink)dependencyObject;
            link.OnCasePropertyChanged(e); 
        }

        static void OnIsDefaultCasePropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
        { 
            FlowSwitchLink link = (FlowSwitchLink)dependencyObject;
            link.OnIsDefaultPropertyChanged(e); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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FlowSwitchLink.cs source code in C# .NET

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