mojo/services/native_viewport/public/interfaces/native_viewport.mojom

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module mojo;

import "geometry/public/interfaces/geometry.mojom";
import "gpu/public/interfaces/command_buffer.mojom";
import "input_events/public/interfaces/input_events.mojom";
import "surfaces/public/interfaces/surface_id.mojom";

struct ViewportMetrics {
  Size size;
  float device_pixel_ratio = 1.0;
};

[Client=NativeViewportClient]
interface NativeViewport {
  // TODO(sky): having a create function is awkward. Should there be a factory
  // to create the NativeViewport that takes the size?
  Create(Size size) => (uint64 native_viewport_id);
  Show();
  Hide();
  Close();
  SetSize(Size size);
  SubmittedFrame(SurfaceId surface_id);
  SetEventDispatcher(NativeViewportEventDispatcher dispatcher);
};

interface NativeViewportEventDispatcher {
  OnEvent(Event event) => ();
};

interface NativeViewportClient {
  // OnMetricsAvailable() is sent at least once after the callback from Create()
  // is called.
  OnMetricsChanged(ViewportMetrics metrics);
  OnDestroyed();
};