ToolboxControl.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / Toolbox / ToolboxControl.cs / 1305376 / ToolboxControl.cs

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

 
namespace System.Activities.Presentation.Toolbox
{ 
    using System; 
    using System.Activities.Presentation.View;
    using System.Collections.Generic; 
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.Diagnostics.CodeAnalysis;
    using System.Drawing.Design; 
    using System.Runtime;
    using System.Windows; 
    using System.Windows.Controls; 
    using System.Windows.Input;
    using System.Windows.Markup; 

    // This class is responsible for rendering cate----ezed tools collection
    // It also provides methods for notifing user about tool selection/creation events
 
    [TemplatePart(Name = "PART_SearchBox"), TemplatePart(Name = "PART_Tools")]
    [ContentProperty("Categories")] 
    sealed public partial class ToolboxControl : Control 
    {
        public static readonly DependencyProperty ToolboxFileProperty = 
                DependencyProperty.Register("ToolboxFile",
                typeof(string),
                typeof(ToolboxControl),
                new PropertyMetadata( 
                string.Empty,
                new PropertyChangedCallback(OnToolboxFileChanged))); 
 
        static readonly DependencyPropertyKey SelectedToolPropertyKey =
                DependencyProperty.RegisterReadOnly("SelectedTool", 
                typeof(ToolboxItem),
                typeof(ToolboxControl),
                new PropertyMetadata(
                null, 
                new PropertyChangedCallback(OnToolSelected)));
 
        public static readonly DependencyProperty SelectedToolProperty = SelectedToolPropertyKey.DependencyProperty; 

        public static readonly DependencyProperty ToolItemStyleProperty = 
                DependencyProperty.Register("ToolItemStyle",
                typeof(Style),
                typeof(ToolboxControl),
                new UIPropertyMetadata(null)); 

        public static readonly DependencyProperty CategoryItemStyleProperty = 
                DependencyProperty.Register("CategoryItemStyle", 
                typeof(Style),
                typeof(ToolboxControl), 
                new UIPropertyMetadata(null));

        public static readonly DependencyProperty ToolTemplateProperty =
                DependencyProperty.Register("ToolTemplate", 
                typeof(DataTemplate),
                typeof(ToolboxControl), 
                new UIPropertyMetadata(null)); 

        public static readonly DependencyProperty CategoryTemplateProperty = 
                DependencyProperty.Register("CategoryTemplate",
                typeof(DataTemplate),
                typeof(ToolboxControl),
                new UIPropertyMetadata(null)); 

        public static readonly RoutedEvent ToolCreatedEvent = 
                EventManager.RegisterRoutedEvent("ToolCreated", 
                RoutingStrategy.Bubble,
                typeof(ToolCreatedEventHandler), 
                typeof(ToolboxControl));

        public static readonly RoutedEvent ToolSelectedEvent =
                EventManager.RegisterRoutedEvent("ToolSelected", 
                RoutingStrategy.Bubble,
                typeof(RoutedEventHandler), 
                typeof(ToolboxControl)); 

 
        internal TextBox searchBox;
        TreeView toolsTreeView;
        ToolboxCategoryItems categories;
 
        [SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline")]
        static ToolboxControl() 
        { 
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ToolboxControl), new FrameworkPropertyMetadata(typeof(ToolboxControl)));
        } 

        public ToolboxControl()
        {
            var callback = new NotifyCollectionChangedEventHandler(this.OnCategoryCollectionChanged); 
            this.categories = new ToolboxCategoryItems(callback);
        } 
 
        public event ToolCreatedEventHandler ToolCreated
        { 
            add
            {
                AddHandler(ToolCreatedEvent, value);
            } 
            remove
            { 
                RemoveHandler(ToolCreatedEvent, value); 
            }
        } 

        public event RoutedEventHandler ToolSelected
        {
            add 
            {
                AddHandler(ToolSelectedEvent, value); 
            } 
            remove
            { 
                RemoveHandler(ToolSelectedEvent, value);
            }
        }
 
        [Fx.Tag.KnownXamlExternal]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] 
        [SuppressMessage(FxCop.Category.Usage, "CA2227:CollectionPropertiesShouldBeReadOnly", 
            Justification = "The setter implemenation is required for XAML support. The setter doesn't replace the collection instance, but copies its content to internal collection")]
        public ToolboxCategoryItems Categories 
        {
            get { return this.categories; }
            set
            { 
                this.categories.Clear();
                if (null != value) 
                { 
                    foreach (var category in value)
                    { 
                        this.categories.Add(category);
                    }
                }
            } 
        }
 
        public string ToolboxFile 
        {
            get { return (string)GetValue(ToolboxFileProperty); } 
            set { SetValue(ToolboxFileProperty, value); }
        }

        [Fx.Tag.KnownXamlExternal] 
        public ToolboxItem SelectedTool
        { 
            get { return (ToolboxItem)GetValue(SelectedToolProperty); } 
            private set { SetValue(SelectedToolPropertyKey, value); }
        } 

        [Fx.Tag.KnownXamlExternal]
        public Style ToolItemStyle
        { 
            get { return (Style)GetValue(ToolItemStyleProperty); }
            set { SetValue(ToolItemStyleProperty, value); } 
        } 

        [Fx.Tag.KnownXamlExternal] 
        public Style CategoryItemStyle
        {
            get { return (Style)GetValue(CategoryItemStyleProperty); }
            set { SetValue(CategoryItemStyleProperty, value); } 
        }
 
        [Fx.Tag.KnownXamlExternal] 
        public DataTemplate ToolTemplate
        { 
            get { return (DataTemplate)GetValue(ToolTemplateProperty); }
            set { SetValue(ToolTemplateProperty, value); }
        }
 
        [Fx.Tag.KnownXamlExternal]
        public DataTemplate CategoryTemplate 
        { 
            get { return (DataTemplate)GetValue(CategoryTemplateProperty); }
            set { SetValue(CategoryTemplateProperty, value); } 
        }

        [Fx.Tag.KnownXamlExternal]
        public WorkflowDesigner AssociatedDesigner 
        {
            get; 
            set; 
        }
 
        static void OnToolboxFileChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            ToolboxControl toolboxControl = sender as ToolboxControl;
            string fileName = args.NewValue as string; 
            if (null == toolboxControl || null == fileName)
            { 
                throw FxTrace.Exception.AsError(new ArgumentNullException(null == toolboxControl ? "toolboxControl" : "fileName")); 
            }
 
            try
            {
                ToolboxItemLoader loader = ToolboxItemLoader.GetInstance();
                loader.LoadToolboxItems(fileName, toolboxControl.categories, false); 
            }
            catch 
            { 
                if (!DesignerProperties.GetIsInDesignMode(toolboxControl))
                { 
                    throw;
                }
            }
        } 

        static void OnToolSelected(DependencyObject sender, DependencyPropertyChangedEventArgs args) 
        { 
            ToolboxControl toolboxControl = sender as ToolboxControl;
            if (null == toolboxControl) 
            {
                throw FxTrace.Exception.AsError(new ArgumentNullException("sender"));
            }
            if (null != toolboxControl.SelectedTool) 
            {
                toolboxControl.RaiseEvent(new RoutedEventArgs(ToolSelectedEvent, toolboxControl)); 
            } 
        }
 
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            //template is applied, look for required controls within it 
            this.searchBox = this.Template.FindName("PART_SearchBox", this) as TextBox;
            this.toolsTreeView = this.Template.FindName("PART_Tools", this) as TreeView; 
            //if tools tree view exists - assign style and container selectors (there are different styles 
            //for Cateogries and Tools
            if (null != this.toolsTreeView) 
            {
                this.toolsTreeView.ItemsSource = this.Categories;
                this.toolsTreeView.ItemContainerStyleSelector = new TreeViewContainerStyleSelector(this);
                this.toolsTreeView.ItemTemplateSelector = new TreeViewTemplateSelector(this); 
                this.toolsTreeView.SelectedItemChanged += (s, e) =>
                    { 
                        var toolWrapper = e.NewValue as ToolboxItemWrapper; 
                        this.SelectedTool = toolWrapper != null ? toolWrapper.ToolboxItem : null;
                    }; 
            }
        }

        protected override void OnPreviewKeyDown(KeyEventArgs e) 
        {
            switch (e.Key) 
            { 
                case Key.Up:
                case Key.Down: 
                    if (null != this.searchBox &&
                        e.OriginalSource == this.searchBox &&
                        null != this.toolsTreeView)
                    { 
                        this.toolsTreeView.Focus();
                    } 
                    break; 

                case Key.Enter: 
                    ToolboxItemCreated();
                    e.Handled = true;
                    break;
 
                default:
                    if (null != this.searchBox && e.Source != this.searchBox) 
                    { 
                        if (((e.Key >= Key.A && e.Key <= Key.Z) || (e.Key >= Key.D0 && e.Key <= Key.D9)) &&
                            (e.KeyboardDevice.Modifiers == ModifierKeys.None || e.KeyboardDevice.Modifiers == ModifierKeys.Shift)) 
                        {
                            this.searchBox.Focus();
                        }
                    } 
                    break;
            } 
            base.OnPreviewKeyDown(e); 
        }
 
        void OnCategoryCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            switch (e.Action)
            { 
                case NotifyCollectionChangedAction.Add:
                    foreach (ToolboxCategory category in e.NewItems) 
                    { 
                        if (null == category)
                        { 
                            throw FxTrace.Exception.ArgumentNull("category");
                        }

                        var listener = new NotifyCollectionChangedEventHandler(OnToolsCollectionChange); 
                        category.HandleToolCollectionNotification(listener, true);
 
                        var items = new List(); 
                        foreach (ToolboxItemWrapper toolWrapper in category.Tools)
                        { 
                            items.Add(toolWrapper);
                        }
                        OnToolsCollectionChange(category,
                            new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, items, 0)); 
                    }
                    break; 
 
                default:
                    break; 
            }
            if (null != this.toolsTreeView)
            {
                this.toolsTreeView.ItemsSource = null; 
                this.toolsTreeView.ItemsSource = this.categories;
            } 
        } 

 
        void OnToolsCollectionChange(object sender, NotifyCollectionChangedEventArgs args)
        {
            switch (args.Action)
            { 
                case NotifyCollectionChangedAction.Add:
                    foreach (ToolboxItemWrapper tool in args.NewItems) 
                    { 
                        if (null == tool)
                        { 
                            throw FxTrace.Exception.ArgumentNull("tool");
                        }
                        tool.PropertyChanged += new PropertyChangedEventHandler(OnToolPropertyChanged);
                        OnToolPropertyChanged(tool, null); 
                    }
                    break; 
 
                default:
                    break; 
            }
        }

        void OnToolPropertyChanged(object sender, PropertyChangedEventArgs e) 
        {
            try 
            { 
                ToolboxItemWrapper tool = (ToolboxItemWrapper)sender;
                tool.ResolveToolboxItem(); 
            }
            catch
            {
                if (!DesignerProperties.GetIsInDesignMode(this)) 
                {
                    throw; 
                } 
            }
        } 

        internal void OnToolMouseMove(object sender, MouseEventArgs args)
        {
            ToolboxItem tool; 
            ToolboxItemWrapper toolWrapper;
            if (args.LeftButton == MouseButtonState.Pressed && TryGetSelectedToolboxItem(out tool, out toolWrapper)) 
            { 
                DataObject dataObject = new DataObject(DragDropHelper.WorkflowItemTypeNameFormat, toolWrapper.Type.AssemblyQualifiedName);
                DragDrop.DoDragDrop(this, dataObject, DragDropEffects.Link | DragDropEffects.Copy); 
            }
        }

        internal void OnTreeViewDoubleClick(object sender, MouseEventArgs args) 
        {
            ToolboxItemCreated(); 
        } 

        void ToolboxItemCreated() 
        {
            ToolboxItem tool;
            ToolboxItemWrapper toolWrapper;
            if (TryGetSelectedToolboxItem(out tool, out toolWrapper)) 
            {
                if (null != this.AssociatedDesigner && null != this.AssociatedDesigner.Context) 
                { 
                    DesignerView target = this.AssociatedDesigner.Context.Services.GetService();
                    Dictionary parameters = new Dictionary(); 
                    parameters["TypeName"] = toolWrapper.Type.AssemblyQualifiedName;
                    ((RoutedCommand)DesignerView.CreateWorkflowElementCommand).Execute(parameters, target);
                }
                ToolCreatedEventArgs args = new ToolCreatedEventArgs(ToolCreatedEvent, this, tool.CreateComponents()); 
                RaiseEvent(args);
            } 
        } 

        bool TryGetSelectedToolboxItem(out ToolboxItem toolboxItem, out ToolboxItemWrapper toolboxItemWrapper) 
        {
            toolboxItem = null;
            toolboxItemWrapper = null;
            if (null != this.toolsTreeView && null != this.toolsTreeView.SelectedItem) 
            {
                ToolboxItemWrapper tool = this.toolsTreeView.SelectedItem as ToolboxItemWrapper; 
                if (null != tool && null != tool.ToolboxItem) 
                {
                    toolboxItem = tool.ToolboxItem; 
                    toolboxItemWrapper = tool;

                }
            } 
            return (null != toolboxItem);
        } 
 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

 
namespace System.Activities.Presentation.Toolbox
{ 
    using System; 
    using System.Activities.Presentation.View;
    using System.Collections.Generic; 
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.Diagnostics.CodeAnalysis;
    using System.Drawing.Design; 
    using System.Runtime;
    using System.Windows; 
    using System.Windows.Controls; 
    using System.Windows.Input;
    using System.Windows.Markup; 

    // This class is responsible for rendering cate----ezed tools collection
    // It also provides methods for notifing user about tool selection/creation events
 
    [TemplatePart(Name = "PART_SearchBox"), TemplatePart(Name = "PART_Tools")]
    [ContentProperty("Categories")] 
    sealed public partial class ToolboxControl : Control 
    {
        public static readonly DependencyProperty ToolboxFileProperty = 
                DependencyProperty.Register("ToolboxFile",
                typeof(string),
                typeof(ToolboxControl),
                new PropertyMetadata( 
                string.Empty,
                new PropertyChangedCallback(OnToolboxFileChanged))); 
 
        static readonly DependencyPropertyKey SelectedToolPropertyKey =
                DependencyProperty.RegisterReadOnly("SelectedTool", 
                typeof(ToolboxItem),
                typeof(ToolboxControl),
                new PropertyMetadata(
                null, 
                new PropertyChangedCallback(OnToolSelected)));
 
        public static readonly DependencyProperty SelectedToolProperty = SelectedToolPropertyKey.DependencyProperty; 

        public static readonly DependencyProperty ToolItemStyleProperty = 
                DependencyProperty.Register("ToolItemStyle",
                typeof(Style),
                typeof(ToolboxControl),
                new UIPropertyMetadata(null)); 

        public static readonly DependencyProperty CategoryItemStyleProperty = 
                DependencyProperty.Register("CategoryItemStyle", 
                typeof(Style),
                typeof(ToolboxControl), 
                new UIPropertyMetadata(null));

        public static readonly DependencyProperty ToolTemplateProperty =
                DependencyProperty.Register("ToolTemplate", 
                typeof(DataTemplate),
                typeof(ToolboxControl), 
                new UIPropertyMetadata(null)); 

        public static readonly DependencyProperty CategoryTemplateProperty = 
                DependencyProperty.Register("CategoryTemplate",
                typeof(DataTemplate),
                typeof(ToolboxControl),
                new UIPropertyMetadata(null)); 

        public static readonly RoutedEvent ToolCreatedEvent = 
                EventManager.RegisterRoutedEvent("ToolCreated", 
                RoutingStrategy.Bubble,
                typeof(ToolCreatedEventHandler), 
                typeof(ToolboxControl));

        public static readonly RoutedEvent ToolSelectedEvent =
                EventManager.RegisterRoutedEvent("ToolSelected", 
                RoutingStrategy.Bubble,
                typeof(RoutedEventHandler), 
                typeof(ToolboxControl)); 

 
        internal TextBox searchBox;
        TreeView toolsTreeView;
        ToolboxCategoryItems categories;
 
        [SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline")]
        static ToolboxControl() 
        { 
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ToolboxControl), new FrameworkPropertyMetadata(typeof(ToolboxControl)));
        } 

        public ToolboxControl()
        {
            var callback = new NotifyCollectionChangedEventHandler(this.OnCategoryCollectionChanged); 
            this.categories = new ToolboxCategoryItems(callback);
        } 
 
        public event ToolCreatedEventHandler ToolCreated
        { 
            add
            {
                AddHandler(ToolCreatedEvent, value);
            } 
            remove
            { 
                RemoveHandler(ToolCreatedEvent, value); 
            }
        } 

        public event RoutedEventHandler ToolSelected
        {
            add 
            {
                AddHandler(ToolSelectedEvent, value); 
            } 
            remove
            { 
                RemoveHandler(ToolSelectedEvent, value);
            }
        }
 
        [Fx.Tag.KnownXamlExternal]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] 
        [SuppressMessage(FxCop.Category.Usage, "CA2227:CollectionPropertiesShouldBeReadOnly", 
            Justification = "The setter implemenation is required for XAML support. The setter doesn't replace the collection instance, but copies its content to internal collection")]
        public ToolboxCategoryItems Categories 
        {
            get { return this.categories; }
            set
            { 
                this.categories.Clear();
                if (null != value) 
                { 
                    foreach (var category in value)
                    { 
                        this.categories.Add(category);
                    }
                }
            } 
        }
 
        public string ToolboxFile 
        {
            get { return (string)GetValue(ToolboxFileProperty); } 
            set { SetValue(ToolboxFileProperty, value); }
        }

        [Fx.Tag.KnownXamlExternal] 
        public ToolboxItem SelectedTool
        { 
            get { return (ToolboxItem)GetValue(SelectedToolProperty); } 
            private set { SetValue(SelectedToolPropertyKey, value); }
        } 

        [Fx.Tag.KnownXamlExternal]
        public Style ToolItemStyle
        { 
            get { return (Style)GetValue(ToolItemStyleProperty); }
            set { SetValue(ToolItemStyleProperty, value); } 
        } 

        [Fx.Tag.KnownXamlExternal] 
        public Style CategoryItemStyle
        {
            get { return (Style)GetValue(CategoryItemStyleProperty); }
            set { SetValue(CategoryItemStyleProperty, value); } 
        }
 
        [Fx.Tag.KnownXamlExternal] 
        public DataTemplate ToolTemplate
        { 
            get { return (DataTemplate)GetValue(ToolTemplateProperty); }
            set { SetValue(ToolTemplateProperty, value); }
        }
 
        [Fx.Tag.KnownXamlExternal]
        public DataTemplate CategoryTemplate 
        { 
            get { return (DataTemplate)GetValue(CategoryTemplateProperty); }
            set { SetValue(CategoryTemplateProperty, value); } 
        }

        [Fx.Tag.KnownXamlExternal]
        public WorkflowDesigner AssociatedDesigner 
        {
            get; 
            set; 
        }
 
        static void OnToolboxFileChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            ToolboxControl toolboxControl = sender as ToolboxControl;
            string fileName = args.NewValue as string; 
            if (null == toolboxControl || null == fileName)
            { 
                throw FxTrace.Exception.AsError(new ArgumentNullException(null == toolboxControl ? "toolboxControl" : "fileName")); 
            }
 
            try
            {
                ToolboxItemLoader loader = ToolboxItemLoader.GetInstance();
                loader.LoadToolboxItems(fileName, toolboxControl.categories, false); 
            }
            catch 
            { 
                if (!DesignerProperties.GetIsInDesignMode(toolboxControl))
                { 
                    throw;
                }
            }
        } 

        static void OnToolSelected(DependencyObject sender, DependencyPropertyChangedEventArgs args) 
        { 
            ToolboxControl toolboxControl = sender as ToolboxControl;
            if (null == toolboxControl) 
            {
                throw FxTrace.Exception.AsError(new ArgumentNullException("sender"));
            }
            if (null != toolboxControl.SelectedTool) 
            {
                toolboxControl.RaiseEvent(new RoutedEventArgs(ToolSelectedEvent, toolboxControl)); 
            } 
        }
 
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            //template is applied, look for required controls within it 
            this.searchBox = this.Template.FindName("PART_SearchBox", this) as TextBox;
            this.toolsTreeView = this.Template.FindName("PART_Tools", this) as TreeView; 
            //if tools tree view exists - assign style and container selectors (there are different styles 
            //for Cateogries and Tools
            if (null != this.toolsTreeView) 
            {
                this.toolsTreeView.ItemsSource = this.Categories;
                this.toolsTreeView.ItemContainerStyleSelector = new TreeViewContainerStyleSelector(this);
                this.toolsTreeView.ItemTemplateSelector = new TreeViewTemplateSelector(this); 
                this.toolsTreeView.SelectedItemChanged += (s, e) =>
                    { 
                        var toolWrapper = e.NewValue as ToolboxItemWrapper; 
                        this.SelectedTool = toolWrapper != null ? toolWrapper.ToolboxItem : null;
                    }; 
            }
        }

        protected override void OnPreviewKeyDown(KeyEventArgs e) 
        {
            switch (e.Key) 
            { 
                case Key.Up:
                case Key.Down: 
                    if (null != this.searchBox &&
                        e.OriginalSource == this.searchBox &&
                        null != this.toolsTreeView)
                    { 
                        this.toolsTreeView.Focus();
                    } 
                    break; 

                case Key.Enter: 
                    ToolboxItemCreated();
                    e.Handled = true;
                    break;
 
                default:
                    if (null != this.searchBox && e.Source != this.searchBox) 
                    { 
                        if (((e.Key >= Key.A && e.Key <= Key.Z) || (e.Key >= Key.D0 && e.Key <= Key.D9)) &&
                            (e.KeyboardDevice.Modifiers == ModifierKeys.None || e.KeyboardDevice.Modifiers == ModifierKeys.Shift)) 
                        {
                            this.searchBox.Focus();
                        }
                    } 
                    break;
            } 
            base.OnPreviewKeyDown(e); 
        }
 
        void OnCategoryCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            switch (e.Action)
            { 
                case NotifyCollectionChangedAction.Add:
                    foreach (ToolboxCategory category in e.NewItems) 
                    { 
                        if (null == category)
                        { 
                            throw FxTrace.Exception.ArgumentNull("category");
                        }

                        var listener = new NotifyCollectionChangedEventHandler(OnToolsCollectionChange); 
                        category.HandleToolCollectionNotification(listener, true);
 
                        var items = new List(); 
                        foreach (ToolboxItemWrapper toolWrapper in category.Tools)
                        { 
                            items.Add(toolWrapper);
                        }
                        OnToolsCollectionChange(category,
                            new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, items, 0)); 
                    }
                    break; 
 
                default:
                    break; 
            }
            if (null != this.toolsTreeView)
            {
                this.toolsTreeView.ItemsSource = null; 
                this.toolsTreeView.ItemsSource = this.categories;
            } 
        } 

 
        void OnToolsCollectionChange(object sender, NotifyCollectionChangedEventArgs args)
        {
            switch (args.Action)
            { 
                case NotifyCollectionChangedAction.Add:
                    foreach (ToolboxItemWrapper tool in args.NewItems) 
                    { 
                        if (null == tool)
                        { 
                            throw FxTrace.Exception.ArgumentNull("tool");
                        }
                        tool.PropertyChanged += new PropertyChangedEventHandler(OnToolPropertyChanged);
                        OnToolPropertyChanged(tool, null); 
                    }
                    break; 
 
                default:
                    break; 
            }
        }

        void OnToolPropertyChanged(object sender, PropertyChangedEventArgs e) 
        {
            try 
            { 
                ToolboxItemWrapper tool = (ToolboxItemWrapper)sender;
                tool.ResolveToolboxItem(); 
            }
            catch
            {
                if (!DesignerProperties.GetIsInDesignMode(this)) 
                {
                    throw; 
                } 
            }
        } 

        internal void OnToolMouseMove(object sender, MouseEventArgs args)
        {
            ToolboxItem tool; 
            ToolboxItemWrapper toolWrapper;
            if (args.LeftButton == MouseButtonState.Pressed && TryGetSelectedToolboxItem(out tool, out toolWrapper)) 
            { 
                DataObject dataObject = new DataObject(DragDropHelper.WorkflowItemTypeNameFormat, toolWrapper.Type.AssemblyQualifiedName);
                DragDrop.DoDragDrop(this, dataObject, DragDropEffects.Link | DragDropEffects.Copy); 
            }
        }

        internal void OnTreeViewDoubleClick(object sender, MouseEventArgs args) 
        {
            ToolboxItemCreated(); 
        } 

        void ToolboxItemCreated() 
        {
            ToolboxItem tool;
            ToolboxItemWrapper toolWrapper;
            if (TryGetSelectedToolboxItem(out tool, out toolWrapper)) 
            {
                if (null != this.AssociatedDesigner && null != this.AssociatedDesigner.Context) 
                { 
                    DesignerView target = this.AssociatedDesigner.Context.Services.GetService();
                    Dictionary parameters = new Dictionary(); 
                    parameters["TypeName"] = toolWrapper.Type.AssemblyQualifiedName;
                    ((RoutedCommand)DesignerView.CreateWorkflowElementCommand).Execute(parameters, target);
                }
                ToolCreatedEventArgs args = new ToolCreatedEventArgs(ToolCreatedEvent, this, tool.CreateComponents()); 
                RaiseEvent(args);
            } 
        } 

        bool TryGetSelectedToolboxItem(out ToolboxItem toolboxItem, out ToolboxItemWrapper toolboxItemWrapper) 
        {
            toolboxItem = null;
            toolboxItemWrapper = null;
            if (null != this.toolsTreeView && null != this.toolsTreeView.SelectedItem) 
            {
                ToolboxItemWrapper tool = this.toolsTreeView.SelectedItem as ToolboxItemWrapper; 
                if (null != tool && null != tool.ToolboxItem) 
                {
                    toolboxItem = tool.ToolboxItem; 
                    toolboxItemWrapper = tool;

                }
            } 
            return (null != toolboxItem);
        } 
 
    }
} 

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

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