From d24c44940741c7b81356ab654ea7e8c230f04b31 Mon Sep 17 00:00:00 2001
From: "Marcel W." <marcel.alex.wagner@outlook.com>
Date: Fri, 6 Dec 2024 13:23:32 +0100
Subject: [PATCH] Fix camera still being used after closing camera preview page
 (#1638)

<!--- Provide a general summary of your changes in the Title above -->

## Description
<!--- Describe your changes in detail -->
When leaving the camera capture page, the camera now no longer is in
use.

## Motivation and Context
<!--- Why is this change required? What problem does it solve? -->
<!--- If it fixes an open issue, please link to the issue here. -->
Closes #1610
## How Has This Been Tested?
<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->

## Screenshots (if appropriate):

## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
---
 .../ControlPages/CaptureElementPreviewPage.xaml.cs   | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/WinUIGallery/ControlPages/CaptureElementPreviewPage.xaml.cs b/WinUIGallery/ControlPages/CaptureElementPreviewPage.xaml.cs
index 2a95669df..3ef43a808 100644
--- a/WinUIGallery/ControlPages/CaptureElementPreviewPage.xaml.cs
+++ b/WinUIGallery/ControlPages/CaptureElementPreviewPage.xaml.cs
@@ -19,6 +19,7 @@
 using Windows.Storage.Streams;
 using System.ComponentModel;
 using WinUIGallery.Helper;
+using System.Threading.Tasks;
 
 namespace WinUIGallery.ControlPages
 {
@@ -38,6 +39,17 @@ public CaptureElementPreviewPage()
             captureContainer.Children.Remove(sv);
             captureContainer.Children.Add(expandToFillContainer);
             expandToFillContainer.Children.Add(sv);
+
+            this.Unloaded += this.CaptureElementPreviewPage_Unloaded;
+        }
+
+        private void CaptureElementPreviewPage_Unloaded(object sender, RoutedEventArgs e)
+        {
+            // Needs to run as task to unblock UI thread
+            if (mediaCapture != null)
+            {
+                new Task(mediaCapture.Dispose).Start();
+            }
         }
 
         private MediaFrameSourceGroup mediaFrameSourceGroup;