internal static void IsChecked_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ToggleButton toggleButton = (ToggleButton)d;
bool?isChecked = (bool?)e.NewValue;
// Update DOM appearance (if not using a ControlTemplate):
if (INTERNAL_VisualTreeManager.IsElementInVisualTree(toggleButton) && !(toggleButton.HasTemplate))
{
toggleButton.UpdateDomBasedOnCheckedState(isChecked);
}
// Raise user events if the new value is different from the old value:
bool hasValueRemainedTheSame = (e.NewValue != null && e.NewValue.Equals(e.OldValue)) || (e.NewValue == null && e.OldValue == null);
if (!hasValueRemainedTheSame) // note: We do not simply check "e.NewValue != e.OldValue" because it does not work as expected for boxed values, so example if both values are "true", it returns "false". //todo: do the same for other similar comparisons in the project.
{
if (isChecked == null)
{
toggleButton.OnIndeterminate();
}
else if (isChecked == true)
{
toggleButton.OnChecked();
}
else // false
{
toggleButton.OnUnchecked();
}
}
}
private static void OnIsCheckedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ToggleButton button = (ToggleButton)d;
bool? oldValue = (bool?)e.OldValue;
bool? newValue = (bool?)e.NewValue;
if (newValue == true)
{
button.OnChecked(new RoutedEventArgs {
OriginalSource = button
});
}
else if (newValue == false)
{
button.OnUnchecked(new RoutedEventArgs {
OriginalSource = button
});
}
else
{
button.OnIndeterminate(new RoutedEventArgs {
OriginalSource = button
});
}
button.UpdateVisualStates();
}