Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / ReverseInheritProperty.cs / 2 / ReverseInheritProperty.cs
using System; using System.Collections; using System.Windows.Media; using System.Windows.Input; using MS.Internal; namespace System.Windows { internal abstract class ReverseInheritProperty { internal ReverseInheritProperty( DependencyPropertyKey flagKey, CoreFlags flagCache, CoreFlags flagChanged) { FlagKey = flagKey; FlagCache = flagCache; FlagChanged = flagChanged; } internal abstract void FireNotifications(UIElement uie, ContentElement ce, UIElement3D uie3D, bool oldValue); internal void OnOriginValueChanged(DependencyObject oldOrigin, DependencyObject newOrigin, ref DeferredElementTreeState oldTreeState) { DeferredElementTreeState treeStateLocalCopy = oldTreeState; oldTreeState = null; // Step #1 // Update the cache flags for all elements in the ancestry // of the element that got turned off and record the changed nodes if (oldOrigin != null) { SetCacheFlagInAncestry(oldOrigin, false, treeStateLocalCopy); } // Step #2 // Update the cache flags for all elements in the ancestry // of the element that got turned on and record the changed nodes if (newOrigin != null) { SetCacheFlagInAncestry(newOrigin, true, null); } // Step #3 // Fire value changed on elements in the ancestry of the element that got turned off. if (oldOrigin != null) { FirePropertyChangeInAncestry(oldOrigin, true /* oldValue */, treeStateLocalCopy); } // Step #4 // Fire value changed on elements in the ancestry of the element that got turned on. if (newOrigin != null) { FirePropertyChangeInAncestry(newOrigin, false /* oldValue */, null); } if (oldTreeState == null && treeStateLocalCopy != null) { // Now that we have applied the old tree state, throw it away. treeStateLocalCopy.Clear(); oldTreeState = treeStateLocalCopy; } } void SetCacheFlagInAncestry(DependencyObject element, bool newValue, DeferredElementTreeState treeState) { // If the cache flag value is undergoing change, record it and // propagate the change to the ancestors. if ((!newValue && IsFlagSet(element, FlagCache)) || (newValue && !IsFlagSet(element, FlagCache))) { SetFlag(element, FlagCache, newValue); // NOTE: we toggle the changed flag instead of setting it so that that way common // ancestors show resultant unchanged and do not receive any change notification. SetFlag(element, FlagChanged, !IsFlagSet(element, FlagChanged)); // Check for block reverse inheritance flag, elements like popup want to set this. { UIElement uie = element as UIElement; if (uie != null) { if (uie.BlockReverseInheritance()) { return; } } ContentElement ce = element as ContentElement; if (ce != null) { if (ce.BlockReverseInheritance()) { return; } } UIElement3D ui3D = element as UIElement3D; if (ui3D != null) { if (ui3D.BlockReverseInheritance()) { return; } } } // Propagate the flag up the visual and logical trees. Note our // minimal optimization check to avoid walking both the core // and logical parents if they are the same. { DependencyObject coreParent = DeferredElementTreeState.GetInputElementParent(element, treeState); DependencyObject logicalParent = DeferredElementTreeState.GetLogicalParent(element, treeState); if (coreParent != null) { SetCacheFlagInAncestry(coreParent, newValue, treeState); } if (logicalParent != null && logicalParent != coreParent) { SetCacheFlagInAncestry(logicalParent, newValue, treeState); } } } } void FirePropertyChangeInAncestry(DependencyObject element, bool oldValue, DeferredElementTreeState treeState) { // If the cache value on the owner has been changed fire changed event if (IsFlagSet(element, FlagChanged)) { SetFlag(element, FlagChanged, false); if (oldValue) { element.ClearValue(FlagKey); } else { element.SetValue(FlagKey, true); } UIElement uie = element as UIElement; ContentElement ce = (uie != null) ? null : element as ContentElement; UIElement3D uie3D = (uie != null || ce != null) ? null : element as UIElement3D; FireNotifications(uie, ce, uie3D, oldValue); // Check for block reverse inheritance flag, elements like popup want to set this. if (uie != null) { if (uie.BlockReverseInheritance()) { return; } } else if (ce != null) { if (ce.BlockReverseInheritance()) { return; } } else if (uie3D != null) { if (uie3D.BlockReverseInheritance()) { return; } } // Call FirePropertyChange up the visual and logical trees. // Note our minimal optimization check to avoid walking both // the core and logical parents if they are the same. { DependencyObject coreParent = DeferredElementTreeState.GetInputElementParent(element, treeState); DependencyObject logicalParent = DeferredElementTreeState.GetLogicalParent(element, treeState); if (coreParent != null) { FirePropertyChangeInAncestry(coreParent, oldValue, treeState); } if (logicalParent != null && logicalParent != coreParent) { FirePropertyChangeInAncestry(logicalParent, oldValue, treeState); } } } } ///////////////////////////////////////////////////////////////////// void SetFlag(DependencyObject o, CoreFlags flag, bool value) { UIElement uie = o as UIElement; ContentElement ce = (uie != null) ? null : o as ContentElement; UIElement3D uie3D = (uie != null || ce != null) ? null : o as UIElement3D; if (uie != null) { uie.WriteFlag(flag, value); } else if (ce != null) { ce.WriteFlag(flag, value); } else if (uie3D != null) { uie3D.WriteFlag(flag, value); } } ///////////////////////////////////////////////////////////////////// bool IsFlagSet(DependencyObject o, CoreFlags flag) { UIElement uie = o as UIElement; ContentElement ce = (uie != null) ? null : o as ContentElement; UIElement3D uie3D = (uie != null || ce != null) ? null : o as UIElement3D; if (uie != null) { return uie.ReadFlag(flag); } else if (ce != null) { return ce.ReadFlag(flag); } else if (uie3D != null) { return uie3D.ReadFlag(flag); } return false; } ///////////////////////////////////////////////////////////////////// internal DependencyPropertyKey FlagKey; internal CoreFlags FlagCache, FlagChanged; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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