89 lines
2.4 KiB
C#
89 lines
2.4 KiB
C#
//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace System.Activities.Statements
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{
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using System.Collections.Generic;
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using System.Activities;
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using System.ComponentModel;
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public abstract class FlowNode
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{
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Flowchart owner;
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int cacheId;
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internal FlowNode()
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{
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Index = -1;
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}
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internal abstract Activity ChildActivity
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{
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get;
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}
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internal int Index
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{
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get;
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set;
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}
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internal bool IsOpen
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{
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get
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{
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return this.owner != null;
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}
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}
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internal Flowchart Owner
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{
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get
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{
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return this.owner;
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}
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}
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// Returns true if this is the first time we've visited this node during this pass
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internal bool Open(Flowchart owner, NativeActivityMetadata metadata)
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{
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if (this.cacheId == owner.CacheId)
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{
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// We've already visited this node during this pass
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if (!object.ReferenceEquals(this.owner, owner))
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{
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metadata.AddValidationError(SR.FlowNodeCannotBeShared(this.owner.DisplayName, owner.DisplayName));
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}
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// Whether we found an issue or not we don't want to change
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// the metadata during this pass.
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return false;
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}
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// if owner.ValidateUnconnectedNodes - Flowchart will be responsible for calling OnOpen for all the Nodes (connected and unconnected)
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if (!owner.ValidateUnconnectedNodes)
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{
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OnOpen(owner, metadata);
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}
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this.owner = owner;
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this.cacheId = owner.CacheId;
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this.Index = -1;
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return true;
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}
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internal abstract void OnOpen(Flowchart owner, NativeActivityMetadata metadata);
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internal void GetChildActivities(ICollection<Activity> children)
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{
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if (ChildActivity != null)
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{
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children.Add(ChildActivity);
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}
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}
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internal abstract void GetConnectedNodes(IList<FlowNode> connections);
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}
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}
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