TryCatchDesigner.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 / TryCatchDesigner.xaml.cs / 1407647 / TryCatchDesigner.xaml.cs
                        

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

namespace System.Activities.Core.Presentation 
{
    using System.Activities.Presentation; 
    using System.Activities.Presentation.Metadata; 
    using System.Activities.Presentation.Model;
    using System.Activities.Presentation.View; 
    using System.Activities.Presentation.Services;
    using System.Activities.Statements;
    using System.Collections.ObjectModel;
    using System.Collections.Specialized; 
    using System.ComponentModel;
    using System.Diagnostics.CodeAnalysis; 
    using System.IO; 
    using System.Runtime;
    using System.Windows; 
    using System.Windows.Input;
    using System.Windows.Threading;
    using System.Windows.Controls;
 
    /// 
    /// Interaction logic for TryCatchDesigner.xaml 
    ///  
    partial class TryCatchDesigner
    { 
        const string CatchesPropertyName = "Catches";
        const string ExceptionTypePropertyName = "ExceptionType";
        const string ExpandViewStateKey = "IsExpanded";
 
        public static readonly DependencyProperty ShowTryExpandedProperty =
            DependencyProperty.Register( 
                "ShowTryExpanded", 
                typeof(bool),
                typeof(TryCatchDesigner), 
                new UIPropertyMetadata(true)
            );

        public static readonly DependencyProperty ShowFinallyExpandedProperty = 
            DependencyProperty.Register(
                "ShowFinallyExpanded", 
                typeof(bool), 
                typeof(TryCatchDesigner),
                new UIPropertyMetadata(false) 
            );

        public static readonly DependencyProperty ShowTypePresenterExpandedProperty =
            DependencyProperty.Register( 
                "ShowTypePresenterExpanded",
                typeof(bool), 
                typeof(TryCatchDesigner), 
                new UIPropertyMetadata(false)
            ); 

        public static readonly DependencyProperty SelectedCatchProperty =
            DependencyProperty.Register(
            "SelectedCatch", 
            typeof(ModelItem),
            typeof(TryCatchDesigner), 
            new UIPropertyMetadata(null)); 

        static ObservableCollection mostRecentlyUsedTypes; 
        static ObservableCollection MostRecentlyUsedTypes
        {
            get
            { 
                if (mostRecentlyUsedTypes == null)
                { 
                    mostRecentlyUsedTypes = new ObservableCollection 
                    {
                        typeof(ArgumentException), 
                        typeof(NullReferenceException),
                        typeof(IOException),
                        typeof(InvalidOperationException),
                        typeof(Exception), 
                    };
                } 
                return mostRecentlyUsedTypes; 
            }
        } 

        public bool ShowTryExpanded
        {
            get 
            {
                return (bool)this.GetValue(ShowTryExpandedProperty); 
            } 
            set
            { 
                this.SetValue(ShowTryExpandedProperty, value);
            }
        }
 
        public bool ShowFinallyExpanded
        { 
            get 
            {
                return (bool)this.GetValue(ShowFinallyExpandedProperty); 
            }
            set
            {
                this.SetValue(ShowFinallyExpandedProperty, value); 
            }
        } 
 
        public bool ShowTypePresenterExpanded
        { 
            get
            {
                return (bool)this.GetValue(ShowTypePresenterExpandedProperty);
            } 
            set
            { 
                this.SetValue(ShowTypePresenterExpandedProperty, value); 
            }
        } 

        ModelItem SelectedCatch
        {
            get 
            {
                return (ModelItem)this.GetValue(SelectedCatchProperty); 
            } 
            set
            { 
                this.SetValue(SelectedCatchProperty, value);
            }
        }
 
        TypePresenter typePresenter;
        Label addCatchHintLabel; 
 
        internal static void RegisterMetadata(AttributeTableBuilder builder)
        { 
            Type type = typeof(TryCatch);
            builder.AddCustomAttributes(type, new DesignerAttribute(typeof(TryCatchDesigner)));
            builder.AddCustomAttributes(type, type.GetProperty("Try"), BrowsableAttribute.No);
            builder.AddCustomAttributes(type, type.GetProperty("Finally"), BrowsableAttribute.No); 
            builder.AddCustomAttributes(type, type.GetProperty("Catches"), BrowsableAttribute.No);
            builder.AddCustomAttributes(type, type.GetProperty("Variables"), BrowsableAttribute.No); 
        } 

        [SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")] 
        public TryCatchDesigner()
        {
            InitializeComponent();
 
            this.Loaded += OnLoaded;
            this.Unloaded += OnUnloaded; 
        } 

        void OnLoaded(object sender, RoutedEventArgs e) 
        {
            this.Context.Items.Subscribe(OnSelectionChanged);
            // at this time, this.ModelItem is already set
            this.ModelItem.PropertyChanged += OnModelItemPropertyChanged; 
            this.ModelItem.Properties[CatchesPropertyName].Collection.CollectionChanged += OnModelItemCollectionChanged;
 
            ViewStateService viewStateService = this.Context.Services.GetService(); 

            foreach (ModelItem modelItem in this.ModelItem.Properties["Catches"].Collection) 
            {
                bool? isExpanded = (bool?)viewStateService.RetrieveViewState(modelItem, ExpandViewStateKey);
                if (isExpanded != null && isExpanded.Value)
                { 
                    this.SelectedCatch = modelItem;
                    CollapseTryView(); 
                    CollapseFinallyView(); 
                    break;
                } 
            }
        }

        void OnUnloaded(object sender, RoutedEventArgs e) 
        {
            this.ModelItem.PropertyChanged -= OnModelItemPropertyChanged; 
            this.ModelItem.Properties[CatchesPropertyName].Collection.CollectionChanged -= OnModelItemCollectionChanged; 
            this.Context.Items.Unsubscribe(OnSelectionChanged);
        } 

        void OnModelItemPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            switch (e.PropertyName) 
            {
                case "Try": 
                    ExpandTryView(); 
                    break;
 
                case "Finally":
                    ExpandFinallyView();
                    break;
 
                default:
                    break; 
            } 
        }
 
        void OnModelItemCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            // to update the filter
            this.typePresenter.Filter = this.ExceptionTypeFilter; 
        }
 
        void OnSelectionChanged(Selection selection) 
        {
            if (IsDescendantOfTry(selection.PrimarySelection)) 
            {
                this.ExpandTryView();
            }
            else if (IsDescendantOfFinally(selection.PrimarySelection)) 
            {
                this.ExpandFinallyView(); 
            } 
            else
            { 
                foreach (ModelItem catchObject in this.ModelItem.Properties["Catches"].Collection)
                {
                    if (IsDescendantOfCatch(catchObject, selection.PrimarySelection))
                    { 
                        UpdateSelection(catchObject);
                        break; 
                    } 
                }
            } 
        }

        bool IsDescendantOfTry(ModelItem descendant)
        { 
            return IsDescendantOf(descendant, "Try");
        } 
 
        bool IsDescendantOfFinally(ModelItem descendant)
        { 
            return IsDescendantOf(descendant, "Finally");
        }

        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 IsDescendantOf(ModelItem descendant, string property)
        { 
            if (descendant == null) 
            {
                return false; 
            }
            else
            {
                ModelItem propertyValue = this.ModelItem.Properties[property].Value; 
                return IsAncestorOf(propertyValue, descendant);
            } 
        } 

        internal static bool IsDescendantOfCatch(ModelItem catchObject, ModelItem descendant) 
        {
            Fx.Assert(catchObject != null, "Catch object mustn't be null.");
            if (catchObject == descendant)
            { 
                return true;
            } 
            else 
            {
                ModelItem activityAction = catchObject.Properties["Action"].Value; 
                if (activityAction != null)
                {
                    ModelItem activityActionHandler = activityAction.Properties["Handler"].Value;
                    if (activityActionHandler != null) 
                    {
                        return IsAncestorOf(activityActionHandler, descendant); 
                    } 
                }
                return false; 
            }
        }

        void UpdateSelection(ModelItem newSelectedCatch) 
        {
            ModelItem oldSelectedCatch = this.SelectedCatch; 
            this.SelectedCatch = newSelectedCatch; 

            this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() => 
            {
                if (oldSelectedCatch != null)
                {
                    CatchDesigner oldSelectedCatchDesigner = (CatchDesigner)oldSelectedCatch.View; 
                    if (oldSelectedCatchDesigner != null)
                    { 
                        oldSelectedCatchDesigner.ExpandState = false; 
                        oldSelectedCatchDesigner.PinState = false;
                    } 
                }
                if (newSelectedCatch != null)
                {
                    CollapseTryView(); 
                    CollapseFinallyView();
                    CatchDesigner newSelectedCatchDesigner = (CatchDesigner)newSelectedCatch.View; 
                    if (newSelectedCatchDesigner != null) 
                    {
                        newSelectedCatchDesigner.ExpandState = true; 
                        newSelectedCatchDesigner.PinState = true;
                    }
                }
            })); 
        }
 
        void CreateCatch(Type exceptionType) 
        {
            if (exceptionType != null) 
            {
                Type catchType = typeof(Catch<>).MakeGenericType(exceptionType);
                object catchObject = Activator.CreateInstance(catchType);
 
                Type activityActionType = typeof(ActivityAction<>).MakeGenericType(exceptionType);
                object activityAction = Activator.CreateInstance(activityActionType); 
 
                Type argumentType = typeof(DelegateInArgument<>).MakeGenericType(exceptionType);
                object exceptionArgument = Activator.CreateInstance(argumentType); 
                DelegateInArgument delegateArgument = exceptionArgument as DelegateInArgument;
                Fx.Assert(null != delegateArgument, "delegate argument must be of DelegateInArgument type!");
                delegateArgument.Name = "exception";
 
                catchType.GetProperty(PropertyNames.Action).SetValue(catchObject, activityAction, null);
                activityActionType.GetProperty(PropertyNames.ActionArgument).SetValue(activityAction, exceptionArgument, null); 
 
                this.ModelItem.Properties["Catches"].Collection.Add(catchObject);
            } 
        }

        void OnFinallyViewMouseDown(object sender, MouseButtonEventArgs e)
        { 
            if (e.LeftButton == MouseButtonState.Pressed && e.ClickCount == 2)
            { 
                SwitchTryCatchDesignerHelper.MakeRootDesigner(this); 
                e.Handled = true;
            } 
            else if (e.LeftButton == MouseButtonState.Pressed)
            {
                ExpandFinallyView();
                Keyboard.Focus((IInputElement)sender); 
            }
            else if (e.RightButton == MouseButtonState.Pressed) 
            { 
                if (this.IsExpanded(this.ShowFinallyExpanded))
                { 
                    Keyboard.Focus((IInputElement)sender);
                }
                e.Handled = true;
            } 
        }
 
        void OnFinallyViewMouseUp(object sender, MouseButtonEventArgs e) 
        {
            // avoid context menu upon right-click when it's collapsed 
            if (!IsExpanded(this.ShowFinallyExpanded) && e.RightButton == MouseButtonState.Released)
            {
                e.Handled = true;
            } 
        }
 
        bool IsExpanded(bool isExpanded) 
        {
            DesignerView designerView = this.Context.Services.GetService(); 
            return isExpanded || designerView.ShouldExpandAll;
        }

        void OnTryViewMouseDown(object sender, MouseButtonEventArgs e) 
        {
            if (e.LeftButton == MouseButtonState.Pressed && e.ClickCount == 2) 
            { 
                SwitchTryCatchDesignerHelper.MakeRootDesigner(this);
                e.Handled = true; 
            }
            else if (e.LeftButton == MouseButtonState.Pressed)
            {
                ExpandTryView(); 
                Keyboard.Focus((IInputElement)sender);
            } 
            else if (e.RightButton == MouseButtonState.Pressed) 
            {
                if (this.IsExpanded(this.ShowTryExpanded)) 
                {
                    Keyboard.Focus((IInputElement)sender);
                }
                e.Handled = true; 
            }
        } 
 
        void OnTryViewMouseUp(object sender, MouseButtonEventArgs e)
        { 
            // avoid context menu upon right-click when it's collapsed
            if (!IsExpanded(this.ShowTryExpanded) && e.RightButton == MouseButtonState.Released)
            {
                e.Handled = true; 
            }
        } 
 
        void ExpandFinallyView()
        { 
            UpdateSelection(null);
            this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() =>
            {
                this.ShowTryExpanded = false; 
                this.ShowFinallyExpanded = true;
            })); 
        } 

        void ExpandTryView() 
        {
            UpdateSelection(null);
            this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() =>
            { 
                this.ShowFinallyExpanded = false;
                this.ShowTryExpanded = true; 
            })); 
        }
 
        void CollapseFinallyView()
        {
            this.ShowFinallyExpanded = false;
        } 

        void CollapseTryView() 
        { 
            this.ShowTryExpanded = false;
        } 

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

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

        #region AddCatch Label & TypePresenter

        void OnAddCatchMouseDown(object sender, MouseButtonEventArgs e) 
        {
            if (e.LeftButton == MouseButtonState.Pressed) 
            { 
                this.SwitchToChooseException();
                e.Handled = true; 
            }
        }

        void OnAddCatchGotFocus(object sender, RoutedEventArgs e) 
        {
            this.SwitchToChooseException(); 
            e.Handled = true; 
        }
 
        void SwitchToChooseException()
        {
            this.ShowTypePresenterExpanded = true;
            this.typePresenter.FocusOnVisibleControl(); 
        }
 
        void SwitchToHintText() 
        {
            this.typePresenter.Type = null; 
            this.ShowTypePresenterExpanded = false;
            Keyboard.Focus((IInputElement)this);
        }
 
        void OnAddCatchHintLabelLoaded(object sender, RoutedEventArgs e)
        { 
            this.addCatchHintLabel = (Label)sender; 
        }
 
        void OnAddCatchHintLabelUnloaded(object sender, RoutedEventArgs e)
        {
            this.addCatchHintLabel = null;
        } 

        void OnTypePresenterLoaded(object sender, RoutedEventArgs e) 
        { 
            TypePresenter tp = (TypePresenter)sender;
            Fx.Assert(tp != null, "sender must be a TypePresenter."); 

            this.typePresenter = tp;
            this.typePresenter.Filter = this.ExceptionTypeFilter;
            this.typePresenter.MostRecentlyUsedTypes = MostRecentlyUsedTypes; 
            //UnRegistering because of 137896: Inside tab control multiple Loaded events happen without an Unloaded event.
            this.typePresenter.TypeBrowserClosed -= OnTypePresenterTypeBrowserClosed; 
            this.typePresenter.TypeBrowserClosed += OnTypePresenterTypeBrowserClosed; 
        }
 
        void OnTypePresenterUnloaded(object sender, RoutedEventArgs e)
        {
            if (this.typePresenter != null)
            { 
                this.typePresenter.TypeBrowserClosed -= OnTypePresenterTypeBrowserClosed;
                this.typePresenter = null; 
            } 
        }
 
        void OnTypePresenterTypeBrowserClosed(object sender, RoutedEventArgs e)
        {
            this.typePresenter.FocusOnVisibleControl();
        } 

        void OnTypePresenterKeyDown(object sender, KeyEventArgs e) 
        { 
            switch (e.Key)
            { 
                case Key.Escape:
                    this.SwitchToHintText();
                    e.Handled = true;
                    break; 

                case Key.Enter: 
                    this.AddCatch(); 
                    e.Handled = true;
                    break; 
            }
        }

        void OnTypePresenterLostFocus(object sender, RoutedEventArgs e) 
        {
            if (this.ShowTypePresenterExpanded) 
            { 
                this.AddCatch();
                e.Handled = true; 
            }
        }

        void AddCatch() 
        {
            if (this.typePresenter != null) 
            { 
                Type type = this.typePresenter.Type;
                if (type != null && this.ExceptionTypeFilter(type)) 
                {
                    CreateCatch(type);
                }
                this.SwitchToHintText(); 
            }
        } 
 
        #endregion
 
        bool ExceptionTypeFilter(Type type)
        {
            if (type == null)
            { 
                return false;
            } 
 
            if (type != typeof(Exception) && !type.IsSubclassOf(typeof(Exception)))
            { 
                return false;
            }

            ModelProperty catchesProperty = this.ModelItem.Properties[CatchesPropertyName]; 
            Fx.Assert(catchesProperty != null, "TryCatch.Catches could not be null");
            ModelItemCollection catches = catchesProperty.Collection; 
            Fx.Assert(catches != null, "Catches.Collection could not be null"); 
            foreach (ModelItem catchItem in catches)
            { 
                ModelProperty exceptionTypeProperty = catchItem.Properties[ExceptionTypePropertyName];
                Fx.Assert(exceptionTypeProperty != null, "Catch.ExceptionType could not be null");
                Type exceptionType = exceptionTypeProperty.ComputedValue as Type;
                Fx.Assert(exceptionType != null, "Catch.ExceptionType.Value could not be null"); 

                if (exceptionType == type) 
                { 
                    return false;
                } 
            }

            return true;
        } 
    }
} 

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

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