ActivityDesigner.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / ActivityDesigner.cs / 1305376 / ActivityDesigner.cs
                        
                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------

namespace System.Activities.Presentation 
{
    using System.Activities.Presentation.Model; 
    using System.Activities.Presentation.View; 
    using System.ComponentModel;
    using System.Diagnostics.CodeAnalysis; 
    using System.Runtime;
    using System.Text;
    using System.Windows;
    using System.Windows.Controls.Primitives; 
    using System.Windows.Markup;
    using System.Windows.Media; 
    using System.Windows.Controls; 
    using System.Windows.Input;
    using System.Windows.Threading; 

    public class ActivityDesigner : WorkflowViewElement
    {
        UserControl defaultDisplayNameReadOnlyControl; 
        TextBox defaultDisplayNameBox;
        bool defaultDisplayNameReadOnlyControlMouseDown; 
 
        [Fx.Tag.KnownXamlExternal]
        public DrawingBrush Icon 
        {
            get { return (DrawingBrush)GetValue(IconProperty); }
            set { SetValue(IconProperty, value); }
        } 

        public static readonly DependencyProperty IconProperty = 
            DependencyProperty.Register("Icon", typeof(DrawingBrush), typeof(ActivityDesigner), new UIPropertyMetadata(null)); 

 

        [SuppressMessage(FxCop.Category.Performance, FxCop.Rule.InitializeReferenceTypeStaticFieldsInline,
            Justification="Calls to OverrideMetadata for a dependency property should be done in the static constructor.")]
        static ActivityDesigner() 
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ActivityDesigner), new FrameworkPropertyMetadata(typeof(ActivityDesigner))); 
        } 

        public ActivityDesigner() 
        {
            this.Loaded += (sender, args) =>
            {
                this.SetupDefaultIcon(); 
            };
        } 
 

        protected override string GetAutomationIdMemberName() 
        {
            return "DisplayName";
        }
 
        protected override string GetAutomationHelpText()
        { 
            StringBuilder descriptiveText = new StringBuilder(); 

            EmitPropertyValuePair(descriptiveText, "IsPrimarySelection"); 
            EmitPropertyValuePair(descriptiveText, "IsSelection");
            EmitPropertyValuePair(descriptiveText, "IsCurrentLocation");
            EmitPropertyValuePair(descriptiveText, "IsCurrentContext");
            EmitPropertyValuePair(descriptiveText, "IsBreakpointEnabled"); 
            EmitPropertyValuePair(descriptiveText, "IsBreakpointBounded");
            EmitPropertyValuePair(descriptiveText, "ValidationState"); 
            return descriptiveText.ToString(); 
        }
 
        void EmitPropertyValuePair(StringBuilder description,string propertyName)
        {
            PropertyDescriptor property = TypeDescriptor.GetProperties(this.ModelItem)[propertyName];
            object propertyValue = (property == null) ? null : property.GetValue(this.ModelItem); 
            string propertyValueString = propertyValue == null ? "null" : propertyValue.ToString();
            description.AppendFormat("{0}={1} ", propertyName, propertyValueString); 
        } 

        public override void OnApplyTemplate() 
        {
            base.OnApplyTemplate();
            if (this.defaultDisplayNameBox != null)
            { 
                this.defaultDisplayNameBox.LostFocus -= new RoutedEventHandler(OnDefaultDisplayNameBoxLostFocus);
                this.defaultDisplayNameBox.ContextMenuOpening -= new ContextMenuEventHandler(OnDefaultDisplayNameBoxContextMenuOpening); 
            } 
            if(this.defaultDisplayNameReadOnlyControl != null)
            { 
                this.defaultDisplayNameReadOnlyControl.MouseLeftButtonDown -= new MouseButtonEventHandler(OnDefaultDisplayNameReadOnlyControlMouseLeftButtonDown);
                this.defaultDisplayNameReadOnlyControl.GotKeyboardFocus -= new KeyboardFocusChangedEventHandler(OnDefaultDisplayNameReadOnlyControlGotKeyboardFocus);
            }
            this.defaultDisplayNameReadOnlyControl = this.Template.FindName("DisplayNameReadOnlyControl_6E8E4954_F6B2_4c6c_9E28_33A7A78F1E81", this) as UserControl; 
            this.defaultDisplayNameBox = this.Template.FindName("DisplayNameBox_570C5205_7195_4d4e_953A_8E4B57EF7E7F", this) as TextBox;
            if (this.defaultDisplayNameBox != null && this.defaultDisplayNameReadOnlyControl != null) 
            { 
                this.defaultDisplayNameBox.LostFocus += new RoutedEventHandler(OnDefaultDisplayNameBoxLostFocus);
                this.defaultDisplayNameBox.ContextMenuOpening += new ContextMenuEventHandler(OnDefaultDisplayNameBoxContextMenuOpening); 
                this.defaultDisplayNameReadOnlyControl.MouseLeftButtonDown += new MouseButtonEventHandler(OnDefaultDisplayNameReadOnlyControlMouseLeftButtonDown);
                this.defaultDisplayNameReadOnlyControl.GotKeyboardFocus += new KeyboardFocusChangedEventHandler(OnDefaultDisplayNameReadOnlyControlGotKeyboardFocus);
            }
        } 

        void OnDefaultDisplayNameReadOnlyControlGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e) 
        { 
            if (this.defaultDisplayNameBox != null && this.defaultDisplayNameReadOnlyControl != null)
            { 
                DesignerView designerView = this.Context.Services.GetService();
                if (!designerView.IsReadOnly && !designerView.IsMultipleSelectionMode)
                {
                    this.EnterDisplayNameEditMode(); 
                }
            } 
        } 

        void OnDefaultDisplayNameReadOnlyControlMouseLeftButtonDown(object sender, MouseButtonEventArgs e) 
        {
            this.defaultDisplayNameReadOnlyControlMouseDown = true;
        }
 
        void OnDefaultDisplayNameBoxLostFocus(object sender, RoutedEventArgs e)
        { 
            if (this.defaultDisplayNameBox != null && this.defaultDisplayNameReadOnlyControl != null) 
            {
                this.ExitDisplayNameEditMode(); 
            }
        }

        void OnDefaultDisplayNameBoxContextMenuOpening(object sender, ContextMenuEventArgs e) 
        {
            // to disable the context menu 
            e.Handled = true; 
        }
 
        protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
        {
            this.defaultDisplayNameReadOnlyControlMouseDown = false;
            base.OnPreviewMouseDown(e); 
        }
 
        protected override void OnMouseUp(MouseButtonEventArgs e) 
        {
            // We have to check the defaultDisplayNameReadOnlyControlMouseDown flag to determine whether the mouse is clicked on 
            // the defaultDisplayNameReadOnlyControl. This is because the mouse capture is set on the WorkflowViewElement in
            // OnMouseDown, and as a result MouseUp event is not fired on the defaultDisplayNameReadOnlyControl.
            if (this.defaultDisplayNameBox != null && this.defaultDisplayNameReadOnlyControl != null &&
                this.defaultDisplayNameReadOnlyControlMouseDown) 
            {
                this.defaultDisplayNameReadOnlyControlMouseDown = false; 
                DesignerView designerView = this.Context.Services.GetService(); 
                if (!designerView.IsReadOnly)
                { 
                    this.EnterDisplayNameEditMode();
                }
            }
            base.OnMouseUp(e); 
        }
 
        void EnterDisplayNameEditMode() 
        {
            this.defaultDisplayNameBox.Visibility = Visibility.Visible; 
            this.defaultDisplayNameReadOnlyControl.Visibility = Visibility.Collapsed;
            this.Dispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle, (Action)(() =>
            {
                Keyboard.Focus(this.defaultDisplayNameBox); 
                this.defaultDisplayNameBox.ScrollToHome();
            })); 
        } 

        void ExitDisplayNameEditMode() 
        {
            this.defaultDisplayNameReadOnlyControl.Visibility = Visibility.Visible;
            this.defaultDisplayNameBox.Visibility = Visibility.Collapsed;
        } 

        private void SetupDefaultIcon() 
        { 
            if (this.Icon == null )
            { 
                // Look for a named icon if this property is not set

                if (this.ModelItem != null)
                { 
                    string iconKey = this.ModelItem.ItemType.IsGenericType ? this.ModelItem.ItemType.GetGenericTypeDefinition().Name : this.ModelItem.ItemType.Name;
                    int genericParamsIndex = iconKey.IndexOf('`'); 
                    if (genericParamsIndex > 0) 
                    {
                        iconKey = iconKey.Remove(genericParamsIndex); 
                    }
                    iconKey = iconKey + "Icon";
                    try
                    { 
                        object resourceItem = this.TryFindResource(iconKey);
                        if (resourceItem is DrawingBrush) 
                        { 
                            this.Icon = (DrawingBrush)resourceItem;
                        } 
                    }
                    catch (ResourceReferenceKeyNotFoundException) { }
                    catch (InvalidCastException) { }
                } 
                if (this.Icon == null)
                { 
                    // as a last resort fall back to the default generic leaf activity icon. 
                    this.Icon = (DrawingBrush)this.FindResource("GenericLeafActivityIcon");
                } 
            }
        }
    }
} 

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

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