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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / GeometryHitTestParameters.cs / 1 / GeometryHitTestParameters.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2003 // // File: GeometryHitTestParameters //----------------------------------------------------------------------------- using System; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Threading; using System.Security; using System.Security.Permissions; using System.Collections; using System.Diagnostics; using MS.Internal; namespace System.Windows.Media { ////// This is the class for specifying parameters hit testing with a geometry. /// public class GeometryHitTestParameters : HitTestParameters { private PathGeometry _hitGeometryInternal; // The internal geometry we use for hit testing private Geometry _hitGeometryCache = null; // Cached frozen copy we hand out from HitGeometry property. private Rect _origBounds; private Rect _bounds; private MatrixStack _matrixStack; ////// The constructor takes the geometry to hit test with. /// public GeometryHitTestParameters(Geometry geometry) : base() { // This ctor guarantees that we are initialized in the following way: // // 1. The geometry provided by the user is unmodified // 2. _hitGeometryInternal is a PathGeometry equivilent to the supplied geometry // 3. _hitGeometryInternal.Tranform is a MatrixTransform equivilent to the supplied // geometry.Transform // 4. _origBounds is the untransformed bounds of the _hitGeometryInternal (inner space). // 5. _bounds is the transformed bounds of the _hitGeometryInternal (outer space). // 6. _matrixStack is an empty stack. if (geometry == null) { throw new ArgumentNullException("geometry"); } // Convert the Geometry to an equivilent PathGeometry up front to prevent // conversion on every call to DoesContainWithDetail. If the geometry is // animate this also has the side effect of eliminating animation interplay. _hitGeometryInternal = geometry.GetAsPathGeometry(); // If GetAsPathGeometry was a no-op, force the copy because we do not // went to modify the user's Geometry. if (object.ReferenceEquals(_hitGeometryInternal, geometry)) { _hitGeometryInternal = _hitGeometryInternal.Clone(); } // Convert _hitGeometryInternal.Transform to an equivilent MatrixTransform // so that we can aggregate in PushMatrix/PopMatrix without building a // TransformCollection. Transform origTransform = _hitGeometryInternal.Transform; MatrixTransform newTransform = new MatrixTransform(); _hitGeometryInternal.Transform = newTransform; // Before we initialize MatrixTransform.Matrix, cache the bounds of this // geometry without any transforms. _origBounds = _hitGeometryInternal.Bounds; // If we had a non-Identity transform, update our MatrixTransform.Matrix // with its Value. (Note that when GetAsPathGeometry *isn't* a no-op // it applies the transform to the figures and returns with a Geometry // with an identity Transform.) if (origTransform != null && !origTransform.IsIdentity) { newTransform.Matrix = origTransform.Value; } // Initialize the current transformed bounds of this Geometry _bounds = _hitGeometryInternal.Bounds; _matrixStack = new MatrixStack(); } ////// The geometry to hit test against. This will be a frozen copy of the /// hit geometry transformed into the local space of the Visual being hit /// tested. /// public Geometry HitGeometry { get { if (_hitGeometryCache == null) { _hitGeometryCache = (Geometry) _hitGeometryInternal.GetAsFrozen(); } Debug.Assert(_hitGeometryInternal.Transform.Value == _hitGeometryCache.Transform.Value, "HitGeometry has a different transform than HitGeometryInternal. Did we forget to invalidate the cache?"); return _hitGeometryCache; } } // Use this property when retrieving the hit geometry internally. Right now it avoids a // a cast. In the future it will avoid a copy as well (see bug 1133159). The value from // this property should never be exposed to the user (e.g., do not use it to return // hit test results.) internal PathGeometry InternalHitGeometry { get { return _hitGeometryInternal; } } internal Rect Bounds { get { return _bounds; } } internal void PushMatrix(ref Matrix newMatrix) { MatrixTransform matrixTransform = (MatrixTransform) _hitGeometryInternal.Transform; // Grab the old composedMatrix from our MatrixTransform and save // it on our MatrixStack. Matrix composedMatrix = matrixTransform.Value; _matrixStack.Push(ref composedMatrix, false); // Compose the new matrix into our MatrixTransform MatrixUtil.MultiplyMatrix(ref composedMatrix, ref newMatrix); matrixTransform.Matrix = composedMatrix; // Update active bounds based on new tranform. _bounds = Rect.Transform(_origBounds, composedMatrix); ClearHitGeometryCache(); } internal void PopMatrix() { Matrix matrix = _matrixStack.Peek(); // Restore saved transform. ((MatrixTransform) (_hitGeometryInternal.Transform)).Matrix = matrix; // Update active bounds based on new X-form. _bounds = Rect.Transform(_origBounds, matrix); _matrixStack.Pop(); ClearHitGeometryCache(); } // This method is called to restore the _hitGeometryInternal's transform to its original state // in the event that a user's delegate threw an exception during the hit test walk. internal void EmergencyRestoreOriginalTransform() { // Replace the current transform with the first matrix pushed onto the stack. Matrix matrix = ((MatrixTransform) (_hitGeometryInternal.Transform)).Matrix; while (!_matrixStack.IsEmpty) { matrix = _matrixStack.Peek(); _matrixStack.Pop(); } ((MatrixTransform) (_hitGeometryInternal.Transform)).Matrix = matrix; ClearHitGeometryCache(); } // This clears the private void ClearHitGeometryCache() { _hitGeometryCache = null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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