Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / View / ViewUtilities.cs / 1407647 / ViewUtilities.cs
//---------------------------------------------------------------- // Copyright (c) Microsoft Corporation. All rights reserved. //--------------------------------------------------------------- namespace System.Activities.Presentation.View { using System.Activities.Presentation.Model; using System.Activities.Presentation.Services; static class ViewUtilities { const string ExpandViewStateKey = "IsExpanded"; internal static bool DoesParentAlwaysExpandChildren(ModelItem modelItem, EditingContext context) { return IsParentOfType(modelItem, typeof(IExpandChild), context); } internal static bool DoesParentAlwaysCollapseChildren(ModelItem modelItem, EditingContext context) { bool parentAlwaysCollapsesChild = false; Type parentDesignerType = GetParentDesignerType(modelItem, context); if (typeof(WorkflowViewElement).IsAssignableFrom(parentDesignerType)) { ActivityDesignerOptionsAttribute options = WorkflowViewService.GetAttribute(parentDesignerType); parentAlwaysCollapsesChild = (options != null && options.AlwaysCollapseChildren); } return parentAlwaysCollapsesChild; } // Determines whether a particular ModelItem's view will be visible for a given breadcrumb root. //It depends on whether the intermediate designers are expanded or collapsed. internal static bool IsViewVisible(ModelItem child, ModelItem root, EditingContext context) { ModelItem parent = child; while (parent != null && !object.Equals(parent, root)) { parent = GetParentModelItemWithView(parent, context, false); if (!IsViewExpanded(parent, context)) { break; } } return object.Equals(parent, root); } // Get the first parent ModelItem that has a view internal static ModelItem GetParentModelItemWithView(ModelItem modelItem, EditingContext context, bool allowDrillIn) { if (modelItem == null) { return null; } ModelItem parent = modelItem.Parent; WorkflowViewService viewService = GetViewService(context); while (parent != null) { ActivityDesignerOptionsAttribute options = WorkflowViewService.GetAttribute (parent.ItemType); Type viewType = viewService.GetDesignerType(parent.ItemType); if (typeof(WorkflowViewElement).IsAssignableFrom(viewType) && (!allowDrillIn || options == null || options.AllowDrillIn)) { break; } parent = parent.Parent; } return parent; } // Determine whether the view of a ModelItem is expanded without querying the view itself - the view may have not been constructed. internal static bool IsViewExpanded(ModelItem modelItem, EditingContext context) { if (modelItem == null) { return false; } bool isDesignerExpanded = true; bool isDesignerPinned = false; object isExpandedViewState = GetViewStateService(context).RetrieveViewState(modelItem, ExpandViewStateKey); object isPinnedViewState = GetViewStateService(context).RetrieveViewState(modelItem, WorkflowViewElement.PinnedViewStateKey); if (isExpandedViewState != null) { isDesignerExpanded = (bool)isExpandedViewState; } if (isPinnedViewState != null) { isDesignerPinned = (bool)isPinnedViewState; } DesignerView designerView = context.Services.GetService (); return ShouldShowExpanded(IsBreadcrumbRoot(modelItem, context), DoesParentAlwaysExpandChildren(modelItem, context), DoesParentAlwaysCollapseChildren(modelItem, context), isDesignerExpanded, designerView.ShouldExpandAll, designerView.ShouldCollapseAll, isDesignerPinned); } internal static bool IsBreadcrumbRoot(ModelItem modelItem, EditingContext context) { DesignerView designerView = context.Services.GetService (); return modelItem != null && modelItem.View != null && modelItem.View.Equals(designerView.RootDesigner); } internal static bool ShouldShowExpanded( bool isRootDesigner, bool parentAlwaysExpandChildren, bool parentAlwaysCollapseChildren, bool expandState, bool expandAll, bool collapseAll, bool pinState) { //ShowExpanded based on ExpandAll, CollapseAll, PinState, ExpandState bool showExpanded; if (pinState) { showExpanded = expandState; } else { showExpanded = !collapseAll && (expandAll || expandState); } //return value based on the position of the element in the workflow tree. return (isRootDesigner || parentAlwaysExpandChildren || (!parentAlwaysCollapseChildren && showExpanded)); } static WorkflowViewService GetViewService(EditingContext context) { return context.Services.GetService () as WorkflowViewService; } static ViewStateService GetViewStateService(EditingContext context) { return context.Services.GetService (); } //Checks to see if the immediate parent WorkflowViewElement is of type "parentType". static bool IsParentOfType(ModelItem modelItem, Type parentType, EditingContext context) { Type parentDesignerType = GetParentDesignerType(modelItem, context); return parentType.IsAssignableFrom(parentDesignerType); } static Type GetParentDesignerType(ModelItem modelItem, EditingContext context) { ModelItem parent = GetParentModelItemWithView(modelItem, context, false); if (parent != null) { return GetViewService(context).GetDesignerType(parent.ItemType); } return null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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