/// <summary>
/// <see cref="PropertyMetadata.PropertyChangedCallback"/>
/// </summary>
private static void OnSharedSizeGroupPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase)d;
if (definition.InParentLogicalTree)
{
string sharedSizeGroupId = (string)e.NewValue;
if (definition._sharedState != null)
{
// if definition is already registered AND shared size group id is changing,
// then un-register the definition from the current shared size state object.
definition._sharedState.RemoveMember(definition);
definition._sharedState = null;
}
if ((definition._sharedState == null) && (sharedSizeGroupId != null))
{
SharedSizeScope privateSharedSizeScope = definition.PrivateSharedSizeScope;
if (privateSharedSizeScope != null)
{
// if definition is not registered and both: shared size group id AND private shared scope
// are available, then register definition.
definition._sharedState = privateSharedSizeScope.EnsureSharedState(sharedSizeGroupId);
definition._sharedState.AddMember(definition);
}
}
}
}
/// <remark>
/// OnPrivateSharedSizeScopePropertyChanged is called when new scope enters or
/// existing scope just left. In both cases if the DefinitionBase object is already registered
/// in SharedSizeState, it should un-register and register itself in a new one.
/// </remark>
private static void OnPrivateSharedSizeScopePropertyChanged(AvaloniaObject d, AvaloniaPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase)d;
if (definition.Parent != null)
{
SharedSizeScope privateSharedSizeScope = (SharedSizeScope)e.NewValue;
if (definition._sharedState != null)
{
// if definition is already registered And shared size scope is changing,
// then un-register the definition from the current shared size state object.
definition._sharedState.RemoveMember(definition);
definition._sharedState = null;
}
if ((definition._sharedState == null) && (privateSharedSizeScope != null))
{
string sharedSizeGroup = definition.SharedSizeGroup;
if (sharedSizeGroup != null)
{
// if definition is not registered and both: shared size group id AND private shared scope
// are available, then register definition.
definition._sharedState = privateSharedSizeScope.EnsureSharedState(definition.SharedSizeGroup);
definition._sharedState.AddMember(definition);
}
}
}
}
/// <summary>
/// Default ctor.
/// </summary>
internal SharedSizeState(SharedSizeScope sharedSizeScope, string sharedSizeGroupId)
{
Debug.Assert(sharedSizeScope != null && sharedSizeGroupId != null);
_sharedSizeScope = sharedSizeScope;
_sharedSizeGroupId = sharedSizeGroupId;
_registry = new List <DefinitionBase>();
_layoutUpdated = new EventHandler(OnLayoutUpdated);
_broadcastInvalidation = true;
}
/// <remarks>
/// This method reflects Grid.SharedScopeProperty state by setting / clearing
/// dynamic property PrivateSharedSizeScopeProperty. Value of PrivateSharedSizeScopeProperty
/// is a collection of SharedSizeState objects for the scope.
/// </remarks>
internal static void OnIsSharedSizeScopePropertyChanged(AvaloniaObject d, AvaloniaPropertyChangedEventArgs e)
{
if ((bool)e.NewValue)
{
SharedSizeScope sharedStatesCollection = new SharedSizeScope();
d.SetValue(PrivateSharedSizeScopeProperty, sharedStatesCollection);
}
else
{
d.ClearValue(PrivateSharedSizeScopeProperty);
}
}
/// <summary>
/// <see cref="PropertyMetadata.PropertyChangedCallback"/>
/// </summary>
/// <remarks>
/// This method reflects Grid.SharedScopeProperty state by setting / clearing
/// dynamic property PrivateSharedSizeScopeProperty. Value of PrivateSharedSizeScopeProperty
/// is a collection of SharedSizeState objects for the scope.
/// Also PrivateSharedSizeScopeProperty is FrameworkPropertyMetadataOptions.Inherits property. So that all children
/// elements belonging to a certain scope can easily access SharedSizeState collection. As well
/// as been norified about enter / exit a scope.
/// </remarks>
internal static void OnIsSharedSizeScopePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
// is it possible to optimize here something like this:
// if ((bool)d.GetValue(Grid.IsSharedSizeScopeProperty) == (d.GetLocalValue(PrivateSharedSizeScopeProperty) != null)
// { /* do nothing */ }
if ((bool)e.NewValue)
{
SharedSizeScope sharedStatesCollection = new SharedSizeScope();
d.SetValue(PrivateSharedSizeScopeProperty, sharedStatesCollection);
}
else
{
d.ClearValue(PrivateSharedSizeScopeProperty);
}
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
/// <summary>
/// Callback to notify about entering model tree.
/// </summary>
internal void OnEnterParentTree()
{
if (_sharedState == null)
{
// start with getting SharedSizeGroup value.
// this property is NOT inhereted which should result in better overall perf.
string sharedSizeGroupId = SharedSizeGroup;
if (sharedSizeGroupId != null)
{
SharedSizeScope privateSharedSizeScope = PrivateSharedSizeScope;
if (privateSharedSizeScope != null)
{
_sharedState = privateSharedSizeScope.EnsureSharedState(sharedSizeGroupId);
_sharedState.AddMember(this);
}
}
}
}
/// <summary>
/// Default ctor.
/// </summary>
internal SharedSizeState(SharedSizeScope sharedSizeScope, string sharedSizeGroupId)
{
Debug.Assert(sharedSizeScope != null && sharedSizeGroupId != null);
_sharedSizeScope = sharedSizeScope;
_sharedSizeGroupId = sharedSizeGroupId;
_registry = new List<DefinitionBase>();
_layoutUpdated = new EventHandler(OnLayoutUpdated);
_broadcastInvalidation = true;
}
/// <summary>
/// <see cref="PropertyMetadata.PropertyChangedCallback"/>
/// </summary>
/// <remarks>
/// This method reflects Grid.SharedScopeProperty state by setting / clearing
/// dynamic property PrivateSharedSizeScopeProperty. Value of PrivateSharedSizeScopeProperty
/// is a collection of SharedSizeState objects for the scope.
/// Also PrivateSharedSizeScopeProperty is FrameworkPropertyMetadataOptions.Inherits property. So that all children
/// elements belonging to a certain scope can easily access SharedSizeState collection. As well
/// as been norified about enter / exit a scope.
/// </remarks>
internal static void OnIsSharedSizeScopePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
//
if ((bool) e.NewValue)
{
SharedSizeScope sharedStatesCollection = new SharedSizeScope();
d.SetValue(PrivateSharedSizeScopeProperty, sharedStatesCollection);
}
else
{
d.ClearValue(PrivateSharedSizeScopeProperty);
}
}
