Enable to cancel ChatdollCamera and RequestProviders using camera

Make it possible to cancel RequestProviders below when cancel word is detected by WakeWordListener:

- CameraRequestProvider
- QRCodeRequestProvider

ChatdollKit/Scripts/Dialog/CameraRequestProvider.cs

@@ -30,7 +30,7 @@ public async Task<Request> GetRequestAsync(User user, Context context, Cancellat
 
             if (chatdollCamera != null)
             {
-                payloads.Add(await chatdollCamera.CaptureTextureWithTimerAsync(CameraCaption, SelfTimerSeconds));
+                payloads.Add(await chatdollCamera.CaptureTextureWithTimerAsync(CameraCaption, SelfTimerSeconds, token));
             }
             else
             {

ChatdollKit/Scripts/Dialog/QRCodeRequestProvider.cs

@@ -27,7 +27,7 @@ public async Task<Request> GetRequestAsync(User user, Context context, Cancellat
 
             if (chatdollCamera != null)
             {
-                payloads.Add(await chatdollCamera.ReadCodeAsync());
+                payloads.Add(await chatdollCamera.ReadCodeAsync(token));
             }
             else
             {

ChatdollKit/Scripts/IO/ChatdollCamera.cs

@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Threading;
 using System.Threading.Tasks;
 using UnityEngine;
 using UnityEngine.UI;
@@ -278,7 +279,7 @@ public void SetCaption(string caption)
         }
 
         // Self-timer
-        public async Task<Texture2D> CaptureTextureWithTimerAsync(string caption, int timerSeconds)
+        public async Task<Texture2D> CaptureTextureWithTimerAsync(string caption, int timerSeconds, CancellationToken token)
         {
             if (!Launch(caption))
             {
@@ -296,9 +297,18 @@ public async Task<Texture2D> CaptureTextureWithTimerAsync(string caption, int ti
 
                 for (var i = timerSeconds; i > 0; i--)
                 {
+                    if (token.IsCancellationRequested)
+                    {
+                        break;
+                    }
                     selfTimerCounter.text = i.ToString();
                     OnTimer?.Invoke(i);
-                    await Task.Delay(1000);
+                    await Task.Delay(1000, token);
+                }
+
+                if (token.IsCancellationRequested)
+                {
+                    return null;
                 }
                 selfTimerCounter.text = string.Empty;
 
@@ -308,7 +318,12 @@ public async Task<Texture2D> CaptureTextureWithTimerAsync(string caption, int ti
                 {
                     // Preview captured photo when preview time is longer than zero
                     previewWindow.texture = photo;
-                    await Task.Delay((int)(PreviewTime * 1000));
+                    await Task.Delay((int)(PreviewTime * 1000), token);
+                }
+
+                if (token.IsCancellationRequested)
+                {
+                    return null;
                 }
 
                 return photo;
@@ -330,7 +345,7 @@ public async Task<Texture2D> CaptureTextureWithTimerAsync(string caption, int ti
         }
 
         // QRCode/Barcode reader
-        public async Task<string> ReadCodeAsync()
+        public async Task<string> ReadCodeAsync(CancellationToken token)
         {
             if (DecodeCode == null)
             {
@@ -354,8 +369,8 @@ public async Task<string> ReadCodeAsync()
                 }
 
                 var startTime = Time.time;
-                // Exit loop when camera is closed
-                while (IsAlreadyLaunched)
+                // Exit loop when camera is closed or cancel requested
+                while (IsAlreadyLaunched && !token.IsCancellationRequested)
                 {
                     var texture = GetTexture();
                     result = DecodeCode(texture);