/// <summary> /// If the DO is frozen, we'll return our frozen sentinel. Otherwise we'll make /// an unfrozen copy. /// </summary> internal override object CreateDefaultValue(DependencyObject owner, DependencyProperty property) { Debug.Assert(owner != null && property != null, "It is the caller responsibility to ensure that owner and property are non-null."); Freezable result = _defaultValuePrototype; Freezable ownerFreezable = owner as Freezable; // If the owner is frozen, just return the frozen prototype. if (ownerFreezable != null && ownerFreezable.IsFrozen) { return(result); } result = _defaultValuePrototype.Clone(); // Wire up a FreezableDefaultPromoter to observe the default value we // just created and automatically promote it to local if it is modified. FreezableDefaultPromoter promoter = new FreezableDefaultPromoter(owner, property); promoter.SetFreezableDefaultValue(result); result.Changed += promoter.OnDefaultValueChanged; return(result); }
/// <summary> /// If the DO is frozen, we'll return our frozen sentinel. Otherwise we'll make /// an unfrozen copy. /// </summary> internal override object CreateDefaultValue(DependencyObject owner, DependencyProperty property) { Debug.Assert(owner != null && property != null, "It is the caller responsibility to ensure that owner and property are non-null."); Freezable result = _defaultValuePrototype; Freezable ownerFreezable = owner as Freezable; // If the owner is frozen, just return the frozen prototype. if (ownerFreezable != null && ownerFreezable.IsFrozen) { return result; } result = _defaultValuePrototype.Clone(); // Wire up a FreezableDefaultPromoter to observe the default value we // just created and automatically promote it to local if it is modified. FreezableDefaultPromoter promoter = new FreezableDefaultPromoter(owner, property); promoter.SetFreezableDefaultValue(result); result.Changed += promoter.OnDefaultValueChanged; return result; }