EmotionRecognitionPage.xaml.cs

// 
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license.
// 
// Microsoft Cognitive Services: http://www.microsoft.com/cognitive
// 
// Microsoft Cognitive Services Github:
// https://github.com/Microsoft/Cognitive
// 
// Copyright (c) Microsoft Corporation
// All rights reserved.
// 
// MIT License:
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED ""AS IS"", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// 

using ServiceHelpers;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace IntelligentKioskSample.Views
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    [KioskExperience(Title = "Emotion API Explorer", ImagePath = "ms-appx:/Assets/EmotionRecognition.PNG", ExperienceType = ExperienceType.Other)]
    public sealed partial class EmotionRecognitionPage : Page
    {
        public EmotionRecognitionPage()
        {
            this.InitializeComponent();

            this.cameraControl.ImageCaptured += CameraControl_ImageCaptured;
            this.cameraControl.CameraRestarted += CameraControl_CameraRestarted;
        }

        private async void CameraControl_CameraRestarted(object sender, EventArgs e)
        {
            // We induce a delay here to give the camera some time to start rendering before we hide the last captured photo.
            // This avoids a black flash.
            await Task.Delay(500);

            this.imageFromCameraWithFaces.Visibility = Visibility.Collapsed;
        }

        private async void CameraControl_ImageCaptured(object sender, ImageAnalyzer e)
        {
            this.imageFromCameraWithFaces.DataContext = e;
            this.imageFromCameraWithFaces.Visibility = Visibility.Visible;

            await this.cameraControl.StopStreamAsync();
        }

        protected override async void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            await this.cameraControl.StopStreamAsync();
            base.OnNavigatingFrom(e);
        }

        protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            await this.StartWebCameraAsync();
            base.OnNavigatedTo(e);
        }

        private async void OnImageSearchCompleted(object sender, IEnumerable<ImageAnalyzer> args)
        {
            this.imageSearchFlyout.Hide();
            ImageAnalyzer image = args.First();
            image.ShowDialogOnFaceApiErrors = true;

            this.imageWithFacesControl.Visibility = Visibility.Visible;
            this.webCamHostGrid.Visibility = Visibility.Collapsed;
            await this.cameraControl.StopStreamAsync();

            this.imageWithFacesControl.DataContext = image;
        }

        private void OnImageSearchCanceled(object sender, EventArgs e)
        {
            this.imageSearchFlyout.Hide();
        }

        private async void OnWebCamButtonClicked(object sender, RoutedEventArgs e)
        {
            await StartWebCameraAsync();
        }

        private async Task StartWebCameraAsync()
        {
            webCamHostGrid.Visibility = Visibility.Visible;
            imageWithFacesControl.Visibility = Visibility.Collapsed;

            await this.cameraControl.StartStreamAsync();
            await Task.Delay(250);
            this.imageFromCameraWithFaces.Visibility = Visibility.Collapsed;

            UpdateWebCamHostGridSize();
        }

        private void OnPageSizeChanged(object sender, SizeChangedEventArgs e)
        {
            UpdateWebCamHostGridSize();
        }

        private void UpdateWebCamHostGridSize()
        {
            this.webCamHostGrid.Width = this.webCamHostGrid.ActualHeight * (this.cameraControl.CameraAspectRatio != 0 ? this.cameraControl.CameraAspectRatio : 1.777777777777);
        }
    }
}