SwitchDesigner.xaml.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Core.Presentation / System / Activities / Core / Presentation / SwitchDesigner.xaml.cs / 1305376 / SwitchDesigner.xaml.cs
                        

                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Activities.Core.Presentation 
{
    using System; 
    using System.Activities; 
    using System.Activities.Presentation;
    using System.Activities.Presentation.Metadata; 
    using System.Activities.Presentation.Model;
    using System.Activities.Statements;
    using System.ComponentModel;
    using System.Diagnostics; 
    using System.Windows;
    using System.Windows.Controls; 
    using System.Windows.Data; 
    using System.Windows.Input;
    using System.Windows.Media; 
    using System.Windows.Threading;
    using System.Runtime;
    using System.Collections.Generic;
    using System.Activities.Presentation.View; 
    using System.Diagnostics.CodeAnalysis;
    using System.Collections.ObjectModel; 
    using System.Globalization; 

    partial class SwitchDesigner 
    {
        const string ExpandViewStateKey = "IsExpanded";

        public static readonly DependencyProperty CaseTypeProperty = 
            DependencyProperty.Register(
            "CaseType", 
            typeof(Type), 
            typeof(SwitchDesigner),
            new UIPropertyMetadata(null)); 

        public static readonly DependencyProperty SelectedCaseProperty =
            DependencyProperty.Register(
            "SelectedCase", 
            typeof(ModelItem),
            typeof(SwitchDesigner), 
            new UIPropertyMetadata(null)); 

        public static readonly DependencyProperty ShowDefaultCaseExpandedProperty = 
            DependencyProperty.Register(
            "ShowDefaultCaseExpanded",
            typeof(bool),
            typeof(SwitchDesigner), 
            new UIPropertyMetadata(false));
 
        public static readonly DependencyProperty NewKeyProperty = 
            DependencyProperty.Register(
            "NewKey", 
            typeof(object),
            typeof(SwitchDesigner),
            new UIPropertyMetadata(null));
 
        static TypeResolvingOptions argumentTypeResolvingOptions;
 
        TextBlock addNewCaseLabel; 
        CaseKeyBox caseKeyBox;
 
        public bool ShowDefaultCaseExpanded
        {
            get
            { 
                return (bool)this.GetValue(ShowDefaultCaseExpandedProperty);
            } 
            set 
            {
                this.SetValue(ShowDefaultCaseExpandedProperty, value); 
            }
        }

        ModelItem SelectedCase 
        {
            get 
            { 
                return (ModelItem)this.GetValue(SelectedCaseProperty);
            } 
            set
            {
                this.SetValue(SelectedCaseProperty, value);
            } 
        }
 
        Type CaseType 
        {
            get { return (Type)GetValue(CaseTypeProperty); } 
            set { SetValue(CaseTypeProperty, value); }
        }

 		object NewKey 
        {
            get { return GetValue(NewKeyProperty); } 
            set { SetValue(NewKeyProperty, value); } 
        }
 
        public CaseKeyValidationCallbackDelegate CheckDuplicateCaseKey
        {
            get
            { 
                return (object obj, out string reason) =>
                { 
                    reason = string.Empty; 
                    if (ContainsCaseKey(obj))
                    { 
                        string key = obj != null ? obj.ToString() : "(null)";
                        reason = string.Format(CultureInfo.CurrentCulture, SR.DuplicateCaseKey, key);
                        return false;
                    } 
                    return true;
                }; 
            } 
        }
 
        static ObservableCollection mostRecentlyUsedTypes;
        static ObservableCollection MostRecentlyUsedTypes
        {
            get 
            {
                if (mostRecentlyUsedTypes == null) 
                { 
                    mostRecentlyUsedTypes = new ObservableCollection
                    { 
                        new TypeWrapper(typeof(bool)),
                        new TypeWrapper(typeof(int)),
                        new TypeWrapper(typeof(string)),
                    }; 
                }
                return mostRecentlyUsedTypes; 
            } 
        }
 
        static TypeResolvingOptions ArgumentTypeResolvingOptions
        {
            get
            { 
                if (argumentTypeResolvingOptions == null)
                { 
                    argumentTypeResolvingOptions = new TypeResolvingOptions 
                    {
                        Filter = null, 
                        MostRecentlyUsedTypes = MostRecentlyUsedTypes,
                    };
                }
                return argumentTypeResolvingOptions; 
            }
        } 
 
        [SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public SwitchDesigner() 
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(OnLoaded);
            this.Unloaded += new RoutedEventHandler(OnUnloaded); 
            this.Resources.Add("ModelItemKeyValuePairType", typeof(ModelItemKeyValuePair<,>));
        } 
 
        protected override void OnModelItemChanged(object newItem)
        { 
            base.OnModelItemChanged(newItem);
            Type modelItemType = this.ModelItem.ItemType;
            Type[] types = modelItemType.GetGenericArguments();
            Fx.Assert(types.Length == 1, "Switch should have exactly one generic argument"); 
            this.CaseType = types[0];
        } 
 
        void OnModelItemPropertyChanged(object sender, PropertyChangedEventArgs e)
        { 
            if (e.PropertyName == "Default" && !this.ShowDefaultCaseExpanded)
            {
                ExpandDefaultView();
                this.UpdateSelection(null); 
            }
        } 
 
        void OnLoaded(object sender, RoutedEventArgs e)
        { 
            this.Context.Items.Subscribe(OnSelectionChanged);
            this.ModelItem.PropertyChanged += OnModelItemPropertyChanged;

            ViewStateService viewStateService = this.Context.Services.GetService(); 

            foreach (ModelItem modelItem in this.ModelItem.Properties["Cases"].Dictionary.Properties["ItemsCollection"].Collection) 
            { 
                bool? isExpanded = (bool?)viewStateService.RetrieveViewState(modelItem, ExpandViewStateKey);
                if (isExpanded != null && isExpanded.Value) 
                {
                    this.SelectedCase = modelItem;
                    CollapseDefaultView();
                    break; 
                }
            } 
        } 

        void OnUnloaded(object sender, RoutedEventArgs e) 
        {
            this.ModelItem.PropertyChanged -= OnModelItemPropertyChanged;
            this.Context.Items.Unsubscribe(OnSelectionChanged);
        } 

        void OnSelectionChanged(Selection selection) 
        { 
            if (this.IsDescendantOfDefault(selection.PrimarySelection))
            { 
                this.ExpandDefaultView();
            }
            else
            { 
                foreach (ModelItem caseObject in this.ModelItem.Properties["Cases"].Dictionary.Properties["ItemsCollection"].Collection)
                 { 
                     if (IsDescendantOfCase(caseObject, selection.PrimarySelection)) 
                     {
                         UpdateSelection(caseObject); 
                         break;
                     }
                 }
             } 
        }
 
        static bool IsAncestorOf(ModelItem ancester, ModelItem descendant) 
        {
            if (ancester == null) 
            {
                return false;
            }
 
            ModelItem itr = descendant;
            while (itr != null) 
            { 
                if (itr == ancester)
                { 
                    return true;
                }
                itr = itr.Parent;
            } 
            return false;
        } 
 
        bool IsDescendantOfDefault(ModelItem descendant)
        { 
            if (descendant == null)
            {
                return false;
            } 
            else
            { 
                ModelItem defaultValue = this.ModelItem.Properties["Default"].Value; 
                return IsAncestorOf(defaultValue, descendant);
            } 
        }

        internal static bool IsDescendantOfCase(ModelItem caseObject, ModelItem descendant)
        { 
            Fx.Assert(caseObject != null, "Case object mustn't be null.");
            if (caseObject == descendant) 
            { 
                return true;
            } 
            else
            {
                ModelItem caseValue = caseObject.Properties["Value"].Value;
                return IsAncestorOf(caseValue, descendant); 
            }
        } 
 
        void UpdateSelection(ModelItem newSelectedCase)
        { 
            ModelItem oldSelectedCase = this.SelectedCase;
            this.SelectedCase = newSelectedCase;

            this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() => 
            {
                if (oldSelectedCase != null) 
                { 
                    CaseDesigner oldSelectedCaseDesigner = (CaseDesigner)oldSelectedCase.View;
                    if (oldSelectedCaseDesigner != null) 
                    {
                        oldSelectedCaseDesigner.ExpandState = false;
                        oldSelectedCaseDesigner.PinState = false;
                    } 
                }
                if (newSelectedCase != null) 
                { 
                    CollapseDefaultView();
 
                    CaseDesigner newSelectedCaseDesigner = (CaseDesigner)newSelectedCase.View;
                    if (newSelectedCaseDesigner != null)
                    {
                        newSelectedCaseDesigner.ExpandState = true; 
                        newSelectedCaseDesigner.PinState = true;
                    } 
                } 
            }));
        } 

        internal static void RegisterMetadata(AttributeTableBuilder builder)
        {
            Type type = typeof(Switch<>); 
            builder.AddCustomAttributes(type, new DesignerAttribute(typeof(SwitchDesigner)));
            builder.AddCustomAttributes(type, type.GetProperty("Default"), BrowsableAttribute.No); 
            builder.AddCustomAttributes(type, new TypeResolvingOptionsAttribute(ArgumentTypeResolvingOptions)); 
        }
 
        void OnDefaultCaseViewMouseDown(object sender, MouseButtonEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed && e.ClickCount == 2)
            { 
                SwitchTryCatchDesignerHelper.MakeRootDesigner(this);
                e.Handled = true; 
            } 
            else if (e.LeftButton == MouseButtonState.Pressed)
            { 
                ExpandDefaultView();
                Keyboard.Focus((IInputElement)sender);
            }
            else if (e.RightButton == MouseButtonState.Pressed) 
            {
                if (this.IsDefaultCaseViewExpanded()) 
                { 
                    Keyboard.Focus((IInputElement)sender);
                } 
                e.Handled = true;
            }
        }
 
        void OnDefaultCaseViewMouseUp(object sender, MouseButtonEventArgs e)
        { 
            // avoid context menu upon right-click when it's collapsed 
            if (!IsDefaultCaseViewExpanded() && e.RightButton == MouseButtonState.Released)
            { 
                e.Handled = true;
            }
        }
 
        bool IsDefaultCaseViewExpanded()
        { 
            DesignerView designerView = this.Context.Services.GetService(); 
            return this.ShowDefaultCaseExpanded || designerView.ShouldExpandAll;
        } 

        void OnDefaultCaseViewKeyDown(object sender, KeyEventArgs e)
        {
            if (sender == e.OriginalSource && (e.Key == Key.Space || e.Key == Key.Enter)) 
            {
                ExpandDefaultView(); 
                e.Handled = true; 
            }
        } 

        void ExpandDefaultView()
        {
            UpdateSelection(null); 
            this.ShowDefaultCaseExpanded = true;
        } 
 
        void CollapseDefaultView()
        { 
            this.ShowDefaultCaseExpanded = false;
        }

        void OnAddNewCaseLabelLoaded(object sender, RoutedEventArgs e) 
        {
            this.addNewCaseLabel = (TextBlock)sender; 
            this.addNewCaseLabel.Visibility = Visibility.Collapsed; 
        }
 
        void OnAddNewCaseLabelUnloaded(object sender, RoutedEventArgs e)
        {
            this.addNewCaseLabel = null;
        } 

        void OnNewKeyTextBoxGotFocus(object sender, RoutedEventArgs e) 
        { 
            this.addNewCaseLabel.Visibility = Visibility.Visible;
        } 

        void OnNewKeyCommitted(object sender, RoutedEventArgs e)
        {
            this.addNewCaseLabel.Visibility = Visibility.Collapsed; 
            try
            { 
                AddNewCase(this.NewKey); 
            }
            catch (ArgumentException ex) 
            {
                ErrorReporting.ShowErrorMessage(ex.Message);
            }
        } 

        void OnNewKeyEditCancelled(object sender, RoutedEventArgs e) 
        { 
            this.addNewCaseLabel.Visibility = Visibility.Collapsed;
        } 

        void OnCaseKeyBoxLoaded(object sender, RoutedEventArgs e)
        {
            this.caseKeyBox = (CaseKeyBox)sender; 
        }
 
        void AddNewCase(object newKey) 
        {
            Type caseType = typeof(ModelItemKeyValuePair<,>).MakeGenericType(new Type[] { this.CaseType, typeof(Activity) }); 
            object mutableKVPair = Activator.CreateInstance(caseType, new object[] { newKey, null });
            ModelProperty casesProp = this.ModelItem.Properties["Cases"];
            Fx.Assert(casesProp != null, "Property Cases is not available");
            ModelItem cases = casesProp.Value; 
            Fx.Assert(cases != null, "Cannot get ModelItem from property Cases");
            ModelProperty itemsCollectionProp = cases.Properties["ItemsCollection"]; 
            Fx.Assert(itemsCollectionProp != null, "Cannot get property ItemsCollection from Cases"); 
            ModelItemCollection itemsCollection = itemsCollectionProp.Collection;
            Fx.Assert(itemsCollection != null, "Cannot get ModelItemCollection from property ItemsCollection"); 
            itemsCollection.Add(mutableKVPair);

            this.caseKeyBox.ResetText();
        } 

        bool ContainsCaseKey(object key) 
        { 
            Type caseType = typeof(ModelItemKeyValuePair<,>).MakeGenericType(new Type[] { this.CaseType, typeof(Activity) });
            ModelProperty casesProp = this.ModelItem.Properties["Cases"]; 
            ModelItem cases = casesProp.Value;
            ModelProperty itemsCollectionProp = cases.Properties["ItemsCollection"];
            ModelItemCollection itemsCollection = itemsCollectionProp.Collection;
 
            foreach (ModelItem item in itemsCollection)
            { 
                object itemKey = caseType.GetProperty("Key").GetGetMethod().Invoke(item.GetCurrentValue(), null); 
                if ((itemKey != null && itemKey.Equals(key)) || (itemKey == key))
                { 
                    return true;
                }
            }
            return false; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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