Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Controls / InkCanvasInnerCanvas.cs / 2 / InkCanvasInnerCanvas.cs
//---------------------------------------------------------------------------- // // File: InkCanvas.cs // // Description: // Defines a Canvas-like class which is used by InkCanvas for the layout. // // Features: // // History: // 02/02/2006 [....]: Ported from the old InnerCanvas. // // Copyright (C) 2001 by Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Collections; using System.ComponentModel; using System.Diagnostics; using System.Windows; using System.Windows.Controls; using System.Windows.Media; namespace MS.Internal.Controls { ////// A subclass of Panel which does layout for InkCanvas. /// internal class InkCanvasInnerCanvas : Panel { //----------------------------------------------------- // // Cnostructors // //----------------------------------------------------- #region Constructors internal InkCanvasInnerCanvas(InkCanvas inkCanvas) { Debug.Assert(inkCanvas != null); _inkCanvas = inkCanvas; } // No default constructor private InkCanvasInnerCanvas() { } #endregion Constructors //------------------------------------------------------ // // Protected Methods // //----------------------------------------------------- #region Protected Methods ////// Override OnVisualChildrenChanged /// /// /// protected internal override void OnVisualChildrenChanged(DependencyObject visualAdded, DependencyObject visualRemoved) { base.OnVisualChildrenChanged(visualAdded, visualRemoved); UIElement removedElement = visualRemoved as UIElement; // If there is an element being removed, we should make sure to update our selected elements list.. if ( removedElement != null ) { InkCanvas.InkCanvasSelection.RemoveElement(removedElement); } //resurface this on the containing InkCanvas InkCanvas.RaiseOnVisualChildrenChanged(visualAdded, visualRemoved); } ////// Override of /// Constraint size. ////// The code is similar to Canvas.MeasureOverride. The only difference we have is that /// InkCanvasInnerCanvas does report the size based on its children's sizes. /// Computed desired size. protected override Size MeasureOverride(Size constraint) { Size childConstraint = new Size(Double.PositiveInfinity, Double.PositiveInfinity); Size newSize = new Size(); foreach ( UIElement child in InternalChildren ) { if ( child == null ) { continue; } child.Measure(childConstraint); // NOTICE-2006/02/03-[....], // We only honor Left and/or Top property for the measure. // For Right/Bottom, only the child.Width/Height will be used. Those properties will be used by the arrange // but not the measure. double left = (double)InkCanvas.GetLeft(child); if ( !DoubleUtil.IsNaN(left) ) { newSize.Width = Math.Max(newSize.Width, left + child.DesiredSize.Width); } else { newSize.Width = Math.Max(newSize.Width, child.DesiredSize.Width); } double top = (double)InkCanvas.GetTop(child); if ( !DoubleUtil.IsNaN(top) ) { newSize.Height = Math.Max(newSize.Height, top + child.DesiredSize.Height); } else { newSize.Height = Math.Max(newSize.Height, child.DesiredSize.Height); } } return newSize; } ////// Canvas computes a position for each of its children taking into account their margin and /// attached Canvas properties: Top, Left. /// /// Canvas will also arrange each of its children. /// This code is same as the Canvas'. /// /// Size that Canvas will assume to position children. protected override Size ArrangeOverride(Size arrangeSize) { //Canvas arranges children at their DesiredSize. //This means that Margin on children is actually respected and added //to the size of layout partition for a child. //Therefore, is Margin is 10 and Left is 20, the child's ink will start at 30. foreach ( UIElement child in InternalChildren ) { if ( child == null ) { continue; } double x = 0; double y = 0; //Compute offset of the child: //If Left is specified, then Right is ignored //If Left is not specified, then Right is used //If both are not there, then 0 double left = (double)InkCanvas.GetLeft(child); if ( !DoubleUtil.IsNaN(left) ) { x = left; } else { double right = (double)InkCanvas.GetRight(child); if ( !DoubleUtil.IsNaN(right) ) { x = arrangeSize.Width - child.DesiredSize.Width - right; } } double top = (double)InkCanvas.GetTop(child); if ( !DoubleUtil.IsNaN(top) ) { y = top; } else { double bottom = (double)InkCanvas.GetBottom(child); if ( !DoubleUtil.IsNaN(bottom) ) { y = arrangeSize.Height - child.DesiredSize.Height - bottom; } } child.Arrange(new Rect(new Point(x, y), child.DesiredSize)); } return arrangeSize; } ////// OnChildDesiredSizeChanged /// /// protected override void OnChildDesiredSizeChanged(UIElement child) { base.OnChildDesiredSizeChanged(child); // Invalid InkCanvasInnerCanvas' measure. InvalidateMeasure(); } ////// Override CreateUIElementCollection method. /// The logical parent of InnerCanvas will be set to InkCanvas instead. /// /// ///protected override UIElementCollection CreateUIElementCollection(FrameworkElement logicalParent) { // Replace the logical parent of the InnerCanvas children with our InkCanvas. return base.CreateUIElementCollection(_inkCanvas); } /// /// Returns LogicalChildren /// protected internal override IEnumerator LogicalChildren { get { // InnerCanvas won't have any logical children publicly. return EmptyEnumerator.Instance; } } ////// The overridden GetLayoutClip method /// ///Geometry to use as additional clip if ClipToBounds=true protected override Geometry GetLayoutClip(Size layoutSlotSize) { // if ( ClipToBounds ) { return base.GetLayoutClip(layoutSlotSize); } else return null; } #endregion Protected Methods //------------------------------------------------------ // // Internal Methods // //------------------------------------------------------ #region Internal Methods ////// Hit test on the children /// /// ///internal UIElement HitTestOnElements(Point point) { UIElement hitElement = null; // Do hittest. HitTestResult hitTestResult = VisualTreeHelper.HitTest(this, point); // Now find out which element is hit if there is a result. if ( hitTestResult != null ) { Visual visual = hitTestResult.VisualHit as Visual; System.Windows.Media.Media3D.Visual3D visual3D = hitTestResult.VisualHit as System.Windows.Media.Media3D.Visual3D; DependencyObject currentObject = null; if ( visual != null ) { currentObject = visual; } else if ( visual3D != null ) { currentObject = visual3D; } while ( currentObject != null ) { DependencyObject parent = VisualTreeHelper.GetParent(currentObject); if ( parent == InkCanvas.InnerCanvas ) { // Break when we hit the inner canvas in the visual tree. hitElement = currentObject as UIElement; Debug.Assert(Children.Contains(hitElement), "The hit element should be a child of InnerCanvas."); break; } else { currentObject = parent; } } } return hitElement; } /// /// Returns the private logical children /// internal IEnumerator PrivateLogicalChildren { get { // Return the logical children of the base - Canvas return base.LogicalChildren; } } ////// Returns the associated InkCanvas /// internal InkCanvas InkCanvas { get { return _inkCanvas; } } #endregion Internal Methods //----------------------------------------------------- // // Private Methods // //------------------------------------------------------ #region Private Methods #endregion Private Methods //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields // The host InkCanvas private InkCanvas _inkCanvas; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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