// Copyright 2017 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

using UnityEngine;
using UnityEditor;

/// A custom editor for the GvrEditorEmulator script.
/// It adds an info panel describing the camera controls.
[CustomEditor(typeof(GvrEditorEmulator)), CanEditMultipleObjects]
public class GvrEditorEmulatorEditor : Editor {
  private float infoHeight;

  private const string INFO_TEXT = "Camera Controls:\n" +
                                   "   • Alt + Move Mouse = Change Yaw/Pitch\n" +
                                   "   • Ctrl + Move Mouse = Change Roll";

  private const int NUM_INFO_LINES = 3;

  void OnEnable() {
    infoHeight = GvrInfoDrawer.GetHeightForLines(NUM_INFO_LINES);
  }

  public override void OnInspectorGUI() {
    DrawDefaultInspector();

    Rect rect = EditorGUILayout.GetControlRect(false, infoHeight);
    GvrInfoDrawer.Draw(rect, INFO_TEXT);
  }
}