sources/Google.Solutions.Testing.Application/Views/ControlExtensions.cs

//
// Copyright 2020 Google LLC
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 System.Collections.Generic;
using System.Windows.Forms;

namespace Google.Solutions.Testing.Application.Views
{
    public static class ControlExtensions
    {
        public static IEnumerable<Control> GetAllControls(this Control parent)
        {
            foreach (Control control in parent.Controls)
            {
                yield return control;
                foreach (var descendant in control.GetAllControls())
                {
                    yield return descendant;
                }
            }
        }

        public static T GetChild<T>(this Control control, string name) where T : Control
        {
            if (control.Controls.ContainsKey(name))
            {
                return (T)control.Controls[name];
            }
            else
            {
                throw new KeyNotFoundException(
                    $"Control {control.Name} does not have a child control named {name}");
            }
        }
    }
}