定义模版选择器

DeedyDesigner/Deedy.Activity/Collection/ActionTemplateCollection.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Deedy.Activity
+{
+    public class ActionTemplateCollection : ObservableCollection<DataTemplate>
+    {
+        public ActionTemplateCollection() { }
+        public bool TryGetTemplate(Type type, out DataTemplate template)
+        {
+            DataTemplate dataTemplate = new DataTemplate(typeof(IActionElement));
+            bool result = false;
+            foreach (var item in this)
+            {
+                if (type.Equals(item.DataType))
+                {
+                    dataTemplate = item;
+                    result = true;
+                    break;
+                }
+            }
+            template = dataTemplate;
+            return result;
+        }
+    }
+}

DeedyDesigner/Deedy.Activity/Selector/ActionTemplateSelector.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Markup;
+
+namespace Deedy.Activity
+{
+    [ContentProperty("ActionTemplates")]
+    [Localizability(LocalizationCategory.Ignore)]
+    public class ActionTemplateSelector : DataTemplateSelector
+    {
+        [AllowNull]
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
+        public ActionTemplateCollection ActionTemplates { get; internal set; } = new ActionTemplateCollection();
+        [AllowNull]
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
+        public Uri Source { get; set; }
+
+        private bool IsLoaded = false;
+        private void LoadFromSource()
+        {
+            if (IsLoaded || Source == null) return;
+            //TODO：从Source中加载DataTemplate；要求DataType必须继承IActionElement接口（ActionTemplates中设置的模版高于Source中的模版）
+            IsLoaded = true;
+        }
+        public ActionTemplateSelector() { }
+        public override DataTemplate SelectTemplate(object item, DependencyObject container)
+        {
+            this.LoadFromSource();
+
+            return base.SelectTemplate(item, container);
+        }
+    }
+}

DeedyDesigner/Deedy.Activity/Themes/FlowTemplates.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    
+</ResourceDictionary>

DeedyDesigner/Deedy.Activity/Themes/FuncTemplates.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:local="clr-namespace:Deedy.Activity">
+    <local:ActionTemplateSelector x:Key="AuxTemplateSelector">
+        <DataTemplate DataType="{x:Type local:BasalAction}">
+            
+        </DataTemplate>
+    </local:ActionTemplateSelector>
+</ResourceDictionary>