Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Annotations / Component / AnnotationAdorner.cs / 1305600 / AnnotationAdorner.cs
//---------------------------------------------------------------------------- //// Copyright(C) Microsoft Corporation. All rights reserved. // // // Description: // AnnotationAdorner wraps an IAnnotationComponent. Its the bridge // between the component and the adorner layer. // // History: // 04/01/2004: axelk: Created AnnotationAdorner.cs // 10/20/2004: rruiz: Moved class to MS.Internal. // // Copyright(C) 2002 by Microsoft Corporation. All rights reserved. //--------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Diagnostics; using System.Windows; using System.Windows.Documents; using System.Windows.Media; namespace MS.Internal.Annotations.Component { ////// An adorner which wraps one IAnnotationComponent. The wrapped component must be at least a UIElement. /// Adorners are UIElements. /// Note:-This class is sealed because it calls OnVisualChildrenChanged virtual in the /// constructor and it does not override it, but derived classes could. /// internal sealed class AnnotationAdorner : Adorner { #region Constructors ////// Return an initialized annotation adorner /// /// The annotation component to wrap in the annotation adorner /// element being annotated public AnnotationAdorner(IAnnotationComponent component, UIElement annotatedElement): base(annotatedElement) { //The summary on top of the file says:- //The wrapped component must be at least a UIElement if(component is UIElement) { _annotationComponent = component; // wrapped annotation component is added as visual child this.AddVisualChild((UIElement)_annotationComponent); } else { throw new ArgumentException(SR.Get(SRID.AnnotationAdorner_NotUIElement), "component"); } } #endregion Constructors #region Public Methods ////// Forwarded to the annotation component to get desired transform relative to the annotated element /// /// Transform to adorned element ///Transform to annotation component public override GeneralTransform GetDesiredTransform(GeneralTransform transform) { //if the component is not visual we do not need this if (!(_annotationComponent is UIElement)) return null; // Give the superclass a chance to modify the transform transform = base.GetDesiredTransform(transform); GeneralTransform compTransform = _annotationComponent.GetDesiredTransform(transform); //ToDo. if the annotated element is null this component must be unloaded. //Temporary return null until the PageViewer Load/Unload bug is fixed //Convert it to an exception after that. if (_annotationComponent.AnnotatedElement == null) return null; if (compTransform == null) { // We need to store the element we are registering on. It may not // be available from the annotation component later. _annotatedElement = _annotationComponent.AnnotatedElement; // Wait for valid text view _annotatedElement.LayoutUpdated += OnLayoutUpdated; return transform; } return compTransform; } #endregion Public Methods #region Protected Methods ////// Derived class must implement to support Visual children. The method must return /// the child at the specified index. Index must be between 0 and GetVisualChildrenCount-1. /// /// By default a Visual does not have any children. /// /// Remark: /// During this virtual call it is not valid to modify the Visual tree. /// protected override Visual GetVisualChild(int index) { if(index != 0 || _annotationComponent == null) { throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange)); } return (UIElement)_annotationComponent; } ////// Derived classes override this property to enable the Visual code to enumerate /// the Visual children. Derived classes need to return the number of children /// from this method. /// /// By default a Visual does not have any children. /// /// Remark: During this virtual method the Visual tree must not be modified. /// protected override int VisualChildrenCount { get { return _annotationComponent != null ? 1 : 0; } } ////// Measurement override. Delegated to children. /// /// Available size for the component ///Return the size enclosing all children protected override Size MeasureOverride(Size availableSize) { Size childConstraint = new Size(Double.PositiveInfinity, Double.PositiveInfinity); Invariant.Assert(_annotationComponent != null, "AnnotationAdorner should only have one child - the annotation component."); ((UIElement)_annotationComponent).Measure(childConstraint); return new Size(0,0); } ////// Override for /// The location reserved for this element by the parent protected override Size ArrangeOverride(Size finalSize) { Invariant.Assert(_annotationComponent != null, "AnnotationAdorner should only have one child - the annotation component."); ((UIElement)_annotationComponent).Arrange(new Rect(((UIElement)_annotationComponent).DesiredSize)); return finalSize; } #endregion ProtectedMethods #region Internal Methods ////// /// Remove all visual children of this AnnotationAdorner. /// Called by AdornerPresentationContext when an annotation adorner is removed from the adorner layer hosting it. /// internal void RemoveChildren() { this.RemoveVisualChild((UIElement)_annotationComponent); _annotationComponent = null; } ////// Call this if the visual of the annotation changes. /// This ill invalidate the AnnotationAdorner and the AdornerLayer which /// will invoke remeasuring of the annotation visual. /// internal void InvalidateTransform() { AdornerLayer adornerLayer = (AdornerLayer)VisualTreeHelper.GetParent(this); InvalidateMeasure(); adornerLayer.InvalidateVisual(); } #endregion Internal Methods #region Internal Properties ////// Return the annotation component that is being wrapped. AdornerPresentationContext needs this. /// ///Wrapped annotation component internal IAnnotationComponent AnnotationComponent { get { return _annotationComponent; } } #endregion Internal Properties #region Private Methods ////// LayoutUpdate event handler /// /// event sender (not used) /// event arguments (not used) private void OnLayoutUpdated(object sender, EventArgs args) { // Unregister for the event _annotatedElement.LayoutUpdated -= OnLayoutUpdated; _annotatedElement = null; // If there are still annotations to display, update the UI if (_annotationComponent.AttachedAnnotations.Count > 0) { _annotationComponent.PresentationContext.Host.InvalidateMeasure(); this.InvalidateMeasure(); } } #endregion Private Methods #region Private Fields ////// The wrapped annotation component /// private IAnnotationComponent _annotationComponent; ////// Used to unregister for the LayoutUpdated event - necessary because in the /// the component may have its annotated element cleared before we can unregister. /// private UIElement _annotatedElement; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ResourceDescriptionAttribute.cs
- ModelEditingScope.cs
- AttributeSetAction.cs
- securestring.cs
- AndCondition.cs
- WebPageTraceListener.cs
- DbgUtil.cs
- _ChunkParse.cs
- SplayTreeNode.cs
- WeakRefEnumerator.cs
- SegmentInfo.cs
- UnionQueryOperator.cs
- TableRow.cs
- JsonDataContract.cs
- SamlAuthorizationDecisionClaimResource.cs
- ProfileService.cs
- ImageEditor.cs
- HtmlTitle.cs
- SchemaTableColumn.cs
- mediapermission.cs
- UserControlParser.cs
- MenuItemStyleCollectionEditor.cs
- TextEmbeddedObject.cs
- Executor.cs
- AsyncOperation.cs
- HMACSHA512.cs
- TemplateColumn.cs
- TimeSpanMinutesOrInfiniteConverter.cs
- JournalEntryListConverter.cs
- TableSectionStyle.cs
- OracleConnection.cs
- Ipv6Element.cs
- DynamicDocumentPaginator.cs
- DataTableMappingCollection.cs
- GeometryHitTestResult.cs
- Vector3D.cs
- HttpCookiesSection.cs
- DataGridViewRowPostPaintEventArgs.cs
- FillBehavior.cs
- Thumb.cs
- Cursor.cs
- MemoryRecordBuffer.cs
- GroupBox.cs
- TextCompositionEventArgs.cs
- DesignOnlyAttribute.cs
- StyleHelper.cs
- IndentTextWriter.cs
- SecondaryIndexDefinition.cs
- WindowInteropHelper.cs
- RoleManagerModule.cs
- BrowsableAttribute.cs
- ObjectDataProvider.cs
- FrameworkContextData.cs
- SafeRightsManagementPubHandle.cs
- HttpClientCertificate.cs
- DeclaredTypeElement.cs
- FixedLineResult.cs
- IpcChannel.cs
- DetailsViewInsertedEventArgs.cs
- CheckBox.cs
- DesignerActionUIStateChangeEventArgs.cs
- System.Data.OracleClient_BID.cs
- ISAPIWorkerRequest.cs
- EntityDescriptor.cs
- PathData.cs
- BamlLocalizabilityResolver.cs
- AssemblyAssociatedContentFileAttribute.cs
- Array.cs
- dataSvcMapFileLoader.cs
- Compiler.cs
- HttpCookieCollection.cs
- SqlServices.cs
- MenuScrollingVisibilityConverter.cs
- XmlWrappingReader.cs
- InvalidateEvent.cs
- ImageAutomationPeer.cs
- cache.cs
- MediaScriptCommandRoutedEventArgs.cs
- NavigationService.cs
- NavigationExpr.cs
- TypeSystem.cs
- ProfileInfo.cs
- PointConverter.cs
- MethodRental.cs
- AccessibleObject.cs
- WindowsBrush.cs
- ResourceAssociationTypeEnd.cs
- diagnosticsswitches.cs
- SqlBulkCopyColumnMapping.cs
- SoapAttributeAttribute.cs
- EntityProviderFactory.cs
- EventSinkHelperWriter.cs
- ReadOnlyTernaryTree.cs
- ProcessRequestArgs.cs
- StoreItemCollection.Loader.cs
- OleDbErrorCollection.cs
- XmlnsPrefixAttribute.cs
- SQLRoleProvider.cs
- ListBox.cs
- ThreadBehavior.cs