/// <summary>
/// Callback for when focused component changes, if <see cref="Component"/> was part of the action invokes PropertyChanged event
/// for <see cref="IsFocused"/>
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FocusedComponentChanged(object sender, FocusedComponentChangedEventArgs e)
{
if (e.GotFocus == Component || e.LostFocus == Component)
{
InvokePropertyChanged(nameof(IsFocused));
}
}
/// <summary>
/// Callback for when focused component changes; removes, updates or creates a new <see cref="_Value"/>
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FocusedComponentChanged(object sender, FocusedComponentChangedEventArgs e)
{
// If the focus did not change (shouldn't happen but it's better to cover this case)
if (e.LostFocus == e.GotFocus)
{
// Don't do anything
return;
}
// Unsubscribe from the component that lost focus
if (e.LostFocus != null)
{
e.LostFocus.PropertyChanged -= FocusedComponentPropertyChangedCallback;
}
// Subscribe to the newly focused component
if (e.GotFocus != null)
{
e.GotFocus.PropertyChanged += FocusedComponentPropertyChangedCallback;
}
// If both the old and new component aren't null, they have the same type and _Info is already constructed
if (e.LostFocus != null && e.GotFocus != null && e.LostFocus.GetType() == e.GotFocus.GetType() && _Value != null)
{
// Update it
_Value.Update(e.GotFocus);
// And return it
return;
}
// If we got here it means that the _Info will either be removed, changed or constructed so, no matter which case it is,
// reset _Info
_Value = null;
// If an element gets focus and it requests info display
if (e.GotFocus != null && _DisplaySettings.TryGetValue(e.GotFocus.GetType(), out var infoSections))
{
// Construct a ComponentInfo for it
_Value = new ComponentInfo(infoSections, e.GotFocus);
}
}
