Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / AdornerDecorator.cs / 1 / AdornerDecorator.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // AdornerDecorator class. // See spec at: [....]/uis/Specs/AdornerLayer%20Spec.htm // // History: // 1/29/2004 [....]: Created // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Windows; using System.Windows.Controls; using System.Windows.Media; using System.Windows.Threading; namespace System.Windows.Documents { ////// This AdornerDecorator does not hookup its child in the logical tree. It's being /// used by PopupRoot and FixedDocument. /// internal class NonLogicalAdornerDecorator : AdornerDecorator { public override UIElement Child { get { return IntChild; } set { if (IntChild != value) { this.RemoveVisualChild(IntChild); this.RemoveVisualChild(AdornerLayer); IntChild = value; if(value != null) { this.AddVisualChild(value); this.AddVisualChild(AdornerLayer); } InvalidateMeasure(); } } } } ////// Object which allows elements beneath it in the visual tree to be adorned. /// AdornerDecorator has two children. /// The first child is the parent of the rest of the visual tree below the AdornerDecorator. /// The second child is the AdornerLayer on which adorners are rendered. /// /// AdornerDecorator is intended to be used as part of an object's Style. /// public class AdornerDecorator : Decorator { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors ////// Constructor /// public AdornerDecorator() : base() { _adornerLayer = new AdornerLayer(); } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ #region Public Properties ////// AdornerLayer on which adorners are rendered. /// public AdornerLayer AdornerLayer { get { return _adornerLayer; } } #endregion Public Properties //----------------------------------------------------- // // Protected Methods // //------------------------------------------------------ #region Protected Methods ////// Measurement override. Implement your size-to-content logic here. /// /// /// Sizing constraint. /// protected override Size MeasureOverride(Size constraint) { Size desiredSize = base.MeasureOverride(constraint); if (VisualTreeHelper.GetParent(_adornerLayer) != null) { // We don't really care about the size of the AdornerLayer-- we'll // always just make the AdornerDecorator the full desiredSize. But // we need to measure it anyway, to make sure Adorners render. _adornerLayer.Measure(constraint); } return desiredSize; } ////// Override for /// The size reserved for this element by the parent ////// The actual ink area of the element, typically the same as finalSize protected override Size ArrangeOverride(Size finalSize) { Size inkSize = base.ArrangeOverride(finalSize); if (VisualTreeHelper.GetParent(_adornerLayer) != null) { _adornerLayer.Arrange(new Rect(finalSize)); } return (inkSize); } ////// Gets or sets the child of the AdornerDecorator. /// public override UIElement Child { get { return base.Child; } set { Visual old = base.Child; if (old == value) { return; } if (value == null) { base.Child = null; RemoveVisualChild(_adornerLayer); } else { base.Child = value; AddVisualChild(_adornerLayer); } } } ////// Returns the Visual children count. /// protected override int VisualChildrenCount { get { if (base.Child != null) { return 2; // One for the child and one for the adorner layer. } else { return 0; } } } ////// Returns the child at the specified index. /// protected override Visual GetVisualChild(int index) { if (base.Child == null) { throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange)); } else { switch (index) { case 0: return base.Child; case 1: return _adornerLayer; default: throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange)); } } } #endregion Protected Methods //----------------------------------------------------- // // Private Members // //----------------------------------------------------- #region Private Members // // This property // 1. Finds the correct initial size for the _effectiveValues store on the current DependencyObject // 2. This is a performance optimization // internal override int EffectiveValuesInitialSize { get { return 6; } } readonly AdornerLayer _adornerLayer; #endregion Private Members } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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