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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Annotations / Component / AnnotationComponentManager.cs / 1 / AnnotationComponentManager.cs
//---------------------------------------------------------------------------- //// Copyright(C) Microsoft Corporation. All rights reserved. // // // Description: // AnnotationComponentManager // // History: // 04/01/2004 [....]: Created AnnotationComponentManager.cs // // Copyright(C) 2002 by Microsoft Corporation. All rights reserved. //--------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Diagnostics; using System.Windows; using System.Windows.Annotations; using System.Windows.Documents; using System.Windows.Media; namespace MS.Internal.Annotations.Component { ////// Instances of this class manage listen for events from the annotation service and create/remove/modify annotation components in response. /// Annotation components are created via indirection through an AnnotationComponentChooser which is set in a DP on the app tree. /// Annotation components are hosted, wrapped inside AnnotationAdorners, in an AdornerLayer respective to the annotated element. /// Every time an annotation service is instantiated an instance of this class is created. /// internal class AnnotationComponentManager : DependencyObject { #region Constructors ////// Return an annotation component manager. If an annotation service is passed in, manager will /// receive notification from the service. Otherwise it will expect to be called directly. /// /// optional, annotation service the annotation component manager will register on internal AnnotationComponentManager(AnnotationService service) : base() { // Only register if a service was passed in. If no service was passed in, we will not receive events. // This means a client will be calling us directly. if (service != null) { service.AttachedAnnotationChanged += new AttachedAnnotationChangedEventHandler(AttachedAnnotationUpdateEventHandler); } } #endregion Constructors #region Internal Methods ////// The given attached annotation was added by the annotation service /// Find annotation components for the given attached annotation, maintain /// mapping from attached annotation to annotation components, and add to the /// adorner layer if the annotation component is not already in a presentation context. /// /// Attached annotation to add /// If true - update components ZOrder after adding the component internal void AddAttachedAnnotation(IAttachedAnnotation attachedAnnotation, bool reorder) { Debug.Assert(attachedAnnotation != null, "AttachedAnnotation should not be null"); IAnnotationComponent component = FindComponent(attachedAnnotation); if (component == null) return; AddComponent(attachedAnnotation, component, reorder); } ////// The given attached annotation was removed by the annotation service. /// Find all annotation components and let them know. /// If an annotation component does not have any other attached annotations, remove it. /// Update the attachedAnnotations map. /// /// Attached annotation to remove /// If true - update components ZOrder after removing the component internal void RemoveAttachedAnnotation(IAttachedAnnotation attachedAnnotation, bool reorder) { Debug.Assert(attachedAnnotation != null, "AttachedAnnotation should not be null"); if (!_attachedAnnotations.ContainsKey(attachedAnnotation)) { // note, this is not always a bug, since an annotation might have resolved, but no annotation component found // the tree traversal bug we have currently results in this failing even if annotation components were found, because // in certain cases annotationService.AttachedAnnotations returns wrong list. return; } IListcurrentList = _attachedAnnotations[attachedAnnotation]; _attachedAnnotations.Remove(attachedAnnotation); // clean up the map foreach (IAnnotationComponent component in currentList) { component.RemoveAttachedAnnotation(attachedAnnotation); // let the annotation component know if (component.AttachedAnnotations.Count == 0) { // if it has no more attached annotations, remove it if (component.PresentationContext != null) component.PresentationContext.RemoveFromHost(component, reorder); } } } #endregion Internal Methods #region Private Methods /// /// Handle the notification coming from the service. Attached annotations can be added, removed, modified. /// Delegate to appropriate method /// /// The sender of the event, an annotation service /// The event arguments containing information on added/deleted/modified attached annotation. private void AttachedAnnotationUpdateEventHandler(object sender, AttachedAnnotationChangedEventArgs e) { switch (e.Action) { case AttachedAnnotationAction.Added: this.AddAttachedAnnotation(e.AttachedAnnotation, true); break; case AttachedAnnotationAction.Deleted: this.RemoveAttachedAnnotation(e.AttachedAnnotation, true); break; case AttachedAnnotationAction.Loaded: this.AddAttachedAnnotation(e.AttachedAnnotation, false); break; case AttachedAnnotationAction.Unloaded: this.RemoveAttachedAnnotation(e.AttachedAnnotation, false); break; case AttachedAnnotationAction.AnchorModified: this.ModifyAttachedAnnotation(e.AttachedAnnotation, e.PreviousAttachedAnchor, e.PreviousAttachmentLevel); break; } } ////// given an attachedAnnotation find the chooser attached at its parent /// and ask it to choose a component suitable to handle the attachedAnnotation /// /// the attachedAnnotation we are to find a component for ///an IAnnotationComponent that can handle the attachedAnnotation (or null) private IAnnotationComponent FindComponent(IAttachedAnnotation attachedAnnotation) { Debug.Assert(attachedAnnotation != null, "AttachedAnnotation should not be null"); UIElement annotatedElement = attachedAnnotation.Parent as UIElement; // casted from DependencyObject Debug.Assert(annotatedElement != null, "the annotatedElement should inherit from UIElement"); AnnotationComponentChooser chooser = AnnotationService.GetChooser(annotatedElement); // should we return a list instead? IAnnotationComponent component = chooser.ChooseAnnotationComponent(attachedAnnotation); return component; } ////// Add an attached annotation to a component and add the component to the adorner layer /// if the annotation component is not already in a presentation context. /// /// the attachedAnnotation we are to add to the component /// the component we are to add to the adorner layer /// if true - the z-order must be reevaluated private void AddComponent(IAttachedAnnotation attachedAnnotation, IAnnotationComponent component, bool reorder) { UIElement annotatedElement = attachedAnnotation.Parent as UIElement; // casted from DependencyObject Debug.Assert(annotatedElement != null, "the annotatedElement should inherit from UIElement"); // if annotation component is already in presentation context, nothing else to do if (component.PresentationContext != null) return; // otherwise host in the appropriate adorner layer AdornerLayer layer = AdornerLayer.GetAdornerLayer(annotatedElement); // note, GetAdornerLayer requires UIElement if (layer == null) { if (PresentationSource.FromVisual(annotatedElement) == null) { // The annotated element is no longer part of the application tree. // This probably means we are out of sync - trying to add an annotation // for an element that has already gone away. Bug # 1580288 tracks // the need to figure this out. return; } throw new InvalidOperationException(SR.Get(SRID.NoPresentationContextForGivenElement, annotatedElement)); } // add to the attachedAnnotations this.AddToAttachedAnnotations(attachedAnnotation, component); // let the annotation component know about the attached annotation // call add before adding to adorner layer so the component can be initialized component.AddAttachedAnnotation(attachedAnnotation); // this might cause recursion in modify if annotation component adds to annotation AdornerPresentationContext.HostComponent(layer, component, annotatedElement, reorder); } ////// Service indicates attached annotation has changed. /// For now, take all annotation components maped from old attached annotation and map from new. /// Then iterate through annotation components to let them know. /// Note, this needs to change later. If modify is radical, existing component might not want it anymore, /// and new one might need to be found... /// /// The modified attached annotation /// The previous attached anchor for the attached annotation /// The previous attachment level for the attached annotation private void ModifyAttachedAnnotation(IAttachedAnnotation attachedAnnotation, object previousAttachedAnchor, AttachmentLevel previousAttachmentLevel) { Debug.Assert(attachedAnnotation != null, "attachedAnnotation should not be null"); Debug.Assert(previousAttachedAnchor != null, "previousAttachedAnchor should not be null"); // if there was no component found for this attached annotation // then we treat the modify case as an add if (!_attachedAnnotations.ContainsKey(attachedAnnotation)) { // this is not necessarily a bug, it can be that the old attached annotation does not have an // associated annotation component. this.AddAttachedAnnotation(attachedAnnotation, true); return; } // we have a previous component for this attached annotation // we find the chooser for the new attached annotation // and ask it to choose a component // 1- if it returned null then we just remove the attached annotation // 2- if it returned a different component, then we treat it as a remove/add // 3- if it returned the same component then we call ModifyAttachedAnnotation on the component IAnnotationComponent newComponent = FindComponent(attachedAnnotation); if (newComponent == null) { RemoveAttachedAnnotation(attachedAnnotation, true); } else { IListcurrentList = _attachedAnnotations[attachedAnnotation]; //save the current list // if we found the new component in any of the list of components we already have for this // attached annotation if (currentList.Contains(newComponent)) { // ask the components to handle the anchor modification event foreach (IAnnotationComponent component in currentList) { component.ModifyAttachedAnnotation(attachedAnnotation, previousAttachedAnchor, previousAttachmentLevel); // let the annotation component know if (component.AttachedAnnotations.Count == 0) { // if component decides it can not handle it, remove it component.PresentationContext.RemoveFromHost(component, true); } } } else { // remove all components RemoveAttachedAnnotation(attachedAnnotation, true); // add the new component AddComponent(attachedAnnotation, newComponent, true); } } } /// /// Add to the map from attached annotations -> annotation components /// /// The attached annotation to use as key /// The component to add to list private void AddToAttachedAnnotations(IAttachedAnnotation attachedAnnotation, IAnnotationComponent component) { Debug.Assert(attachedAnnotation != null, "attachedAnnotation should not be null"); Debug.Assert(component != null, "component should not be null"); IListcurrentList; if (!_attachedAnnotations.TryGetValue(attachedAnnotation, out currentList)) { currentList = new List (); _attachedAnnotations[attachedAnnotation] = currentList; } currentList.Add(component); } #endregion Private Methods #region Private Fields /// /// Map from attached annotation to list of annotation components. /// This map contains all attached anntotations the component manager currently knows. /// private Dictionary> _attachedAnnotations = new Dictionary >(); #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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