// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.fonts;

/// Protocol for listening to possible events that may occur in the `Provider`'s set of fonts.
///
/// Register a listener using [`fuchsia.fonts/Provider.RegisterFontSetEventListener`].
protocol FontSetEventListener {
    /// The set of fonts available in the `Provider` has changed. See
    /// [`fuchsia.fonts/FontSetUpdatedEvent`].
    OnFontSetUpdated(FontSetUpdatedEvent event) -> ();

    // A future addition might include an event that is triggered when the user changes the mapping
    // for generic font families (e.g. configuring "monospace" to default to "Inconsolata" instead of
    // "Roboto Mono").
};

/// An event indicating that the set of fonts available in the `Provider` has changed. This is most
/// frequently caused by an ephemeral font being downloaded and cached. Clients should consider
/// re-requesting fonts and re-rendering any displayed text.
table FontSetUpdatedEvent {
    // No fields at the moment.
};