// Copyright 2017 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.ui.policy;

using fuchsia.ui.input;

/// `Presentation.CaptureKeyboardEvent` will consume this listener interface and
/// call `OnEvent` when the registered keyboard event occurs.
protocol KeyboardCaptureListenerHACK {
    OnEvent(fuchsia.ui.input.KeyboardEvent event);
};

/// `Presentation.CapturePointerEvent` will consume this listener interface and
/// call `OnEvent` when a pointer event occurs.
protocol PointerCaptureListenerHACK {
    OnPointerEvent(fuchsia.ui.input.PointerEvent event);
};

/// Allows clients of Presenter.Present() to control a presentation.
/// Experimental.
[Discoverable]
protocol Presentation {
    /// This call exists so that base shell can capture hotkeys and do special
    /// things with it (e.g., switch a session shell). Phase and modifiers are always
    /// matched, and valid (non-zero) code points are matched. If there is no
    /// valid code point, the filter will match against the hid usage value.
    /// The full KeyboardEvent is supplied to `listener`'s OnEvent.
    // TODO: Figure out the feasibility of this feature and the best place to put
    // it.
    CaptureKeyboardEventHACK(fuchsia.ui.input.KeyboardEvent event_to_capture,
                             KeyboardCaptureListenerHACK listener);

    /// This call exists so that base shell can capture pointer events.
    // TODO: Figure out the feasibility of this feature and the best place to put
    // it. This call will be replaced by gesture disambiguation system in future.
    CapturePointerEventsHACK(PointerCaptureListenerHACK listener);

    /// EXPERIMENTAL. Inject pointer events into input stream. This WILL go
    /// away. Used exclusively by Session Shells to test focus navigation.
    // TODO(SCN-1186): Delete when RequestFocus is available.
    [Transitional]
    InjectPointerEventHACK(fuchsia.ui.input.PointerEvent event);
};