WF4 自定义容器活动

最新推荐文章于 2023-03-19 18:44:10 发布

原创最新推荐文章于 2023-03-19 18:44:10 发布 · 1k 阅读

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#活动 #object #vss #class #null

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主要参考资料：http://blogs.msdn.com/tilovell/default.aspx

1、先定义一个自定义容器活动

[Designer(typeof(CanvasDesigner))] [ContentProperty("Children")] public sealed class CanvasActivity : NativeActivity { [DefaultValue(null)] private Collection<Activity> _children; public Collection<Activity> Children { get { return (_children = _children ?? new Collection<Activity>()); } } protected override void Execute(NativeActivityContext context) { //TODO Console.WriteLine("CanvasActivity"); if (this._children != null && this._children.Count > 0) { foreach (Activity activity in _children) { Console.WriteLine("activity name"+activity.DisplayName); context.ScheduleActivity(activity); } } } }

2、自定义设计器xaml代码如下：

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Activities.Presentation; using System.Activities; using System.Activities.Presentation.Services; using System.Activities.Presentation.Model; using System.Activities.Presentation.View; namespace ActivityLibrary { // Interaction logic for CanvasDesigner.xaml public partial class CanvasDesigner : ICompositeView { public CanvasDesigner() { InitializeComponent(); } #region ICompositeView Members public bool CanPasteItems(List<object> itemsToPaste) { //throw new NotImplementedException(); if (itemsToPaste[0] is Activity) return true; else return false; } public System.Activities.Presentation.View.TypeResolvingOptions DroppingTypeResolvingOptions { get { throw new NotImplementedException(); } } public bool IsDefaultContainer { get { throw new NotImplementedException(); } } public void OnItemMoved(System.Activities.Presentation.Model.ModelItem modelItem) { ModelItem canvasActivity = this.ModelItem; canvasActivity.Properties["Children"].Collection.Remove(modelItem); } public object OnItemsCopied(List<System.Activities.Presentation.Model.ModelItem> itemsToCopy) { throw new NotImplementedException(); } public object OnItemsCut(List<System.Activities.Presentation.Model.ModelItem> itemsToCut) { throw new NotImplementedException(); } public void OnItemsDelete(List<System.Activities.Presentation.Model.ModelItem> itemsToDelete) { ModelItem canvasActivity = ModelItem; foreach (var i in itemsToDelete) { canvasActivity.Properties["Children"].Collection.Remove(i); } } public void OnItemsPasted(List<object> itemsToPaste, List<object> metadata, Point pastePoint, WorkflowViewElement pastePointReference) { ModelItem canvasActivity = this.ModelItem; foreach (var i in itemsToPaste) { ModelItem createdModelItem = canvasActivity.Properties["Children"].Collection.Add(i); } } protected override void OnModelItemChanged(object newItem) { ModelItem canvasActivity = (ModelItem)newItem; Update(canvasActivity); canvasActivity.Properties["Children"].Collection.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler ((senders, args) => Update(this.ModelItem)); } void Update(ModelItem canvasActivity) { this.ContentCanvas.Children.Clear(); foreach (ModelItem modelItem in canvasActivity.Properties["Children"].Collection) { ViewStateService vss = Context.Services.GetService<ViewStateService>(); double x = (double)(vss.RetrieveViewState(modelItem, "CanvasActivity.X") ?? 0.0); double y = (double)(vss.RetrieveViewState(modelItem, "CanvasActivity.Y") ?? 0.0); var view = Context.Services.GetService<ViewService>().GetView(modelItem); Canvas.SetLeft((UIElement)view, x); Canvas.SetTop((UIElement)view, y); this.ContentCanvas.Children.Add((UIElement)view); DragDropHelper.SetCompositeView((WorkflowViewElement)view, this); } } protected override void OnDragEnter(DragEventArgs e) { //Check the object is actually something we want to be droppable if (DragDropHelper.AllowDrop( e.Data, this.Context, typeof(Activity))) { e.Effects = (DragDropEffects.Move & e.AllowedEffects); e.Handled = true; } base.OnDragEnter(e); } protected override void OnDragOver(DragEventArgs e) { if (DragDropHelper.AllowDrop( e.Data, this.Context, typeof(Activity))) { e.Effects = (DragDropEffects.Move & e.AllowedEffects); e.Handled = true; } base.OnDragOver(e); } protected override void OnDrop(DragEventArgs e) { ModelItem canvasActivity = this.ModelItem; //droppedItem - may be a ModelItem or a newly instantiated object (from toolbox) object droppedItem = DragDropHelper.GetDroppedObject(this, e, this.Context); Point p = e.GetPosition(this.ContentCanvas); ModelItem droppedModelItem = canvasActivity.Properties["Children"].Collection.Add(droppedItem); using (ModelEditingScope scope = canvasActivity.BeginEdit()) { ViewStateService vss = Context.Services.GetService<ViewStateService>(); vss.StoreViewStateWithUndo(droppedModelItem, "CanvasActivity.X", p.X); vss.StoreViewStateWithUndo(droppedModelItem, "CanvasActivity.Y", p.Y); Canvas.SetLeft((UIElement)droppedModelItem.View, p.X); Canvas.SetTop((UIElement)droppedModelItem.View, p.Y); //ModelItem sameGuy = canvasActivity.Properties["Children"].Collection.Add(droppedItem); System.Diagnostics.Debug.Assert(Object.ReferenceEquals(droppedModelItem, droppedModelItem)); scope.Complete(); } e.Handled = true; DragDropHelper.SetDragDropCompletedEffects(e, DragDropEffects.Move); base.OnDrop(e); } #endregion } }

3、自定义设计器，CS代码如下：

代码已经上传到csdn了，大家可以下载下来运行看看。http://download.youkuaiyun.com/source/2015265