// Register with the given SolidColorBrush to receive notifications whenever
// the Color property changes.
void RegisterColorChangeCallback(SolidColorBrush colorBrush)
{
if (colorBrush != _foregroundSolidColorBrush)
{
UnregisterColorPropertyChangedCallback();
_foregroundSolidColorBrush = colorBrush;
if (colorBrush != null)
{
_colorPropertyChangedRegistration =
_foregroundSolidColorBrush.RegisterPropertyChangedCallback(
SolidColorBrush.ColorProperty,
OnForegroundBrushColorChanged);
}
}
}
internal static void ReInitAccentColorChanged()
{
if (_currentListenElement != null && _listenToken.HasValue)
{
_currentListenElement.UnregisterPropertyChangedCallback(SolidColorBrush.ColorProperty, _listenToken.Value);
}
if (_currentListenElement == null)
{
_currentListenElement = Window.Current.Content;
if (_currentListenElement != null)
{
SolidColorBrush accentColorBrush = (SolidColorBrush)XamlReader.Load("<SolidColorBrush xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" Color=\"{ThemeResource SystemAccentColor}\" />");
_listenToken = accentColorBrush.RegisterPropertyChangedCallback(SolidColorBrush.ColorProperty, (obj, dp) =>
{
if (AccentColorChanged != null)
{
Color accentColor = (Color)obj.GetValue(dp);
AccentColorChanged(obj, accentColor);
}
});
_currentListenElement.SetValue(AccentColorBrushProperty, accentColorBrush);
}
}
}
