[WIP] Stream reader

BigIslandBarcode/App.xaml.cs

@@ -11,7 +11,7 @@ public App()
 		{
 			InitializeComponent();
 
-			MainPage = new MainPage();
+			MainPage = new NavigationPage(new MainPage());
 		}
 	}
 }

BigIslandBarcode/MainPage.xaml

@@ -15,7 +15,21 @@
 		<Grid
 			Grid.Row="0"
 			BackgroundColor="#aa000000">
-			<Label Grid.Row="2" Text="Top text..." HorizontalOptions="Center" VerticalOptions="Center" TextColor="White" />
+
+            <Button Text="Pick File" 
+                    HorizontalOptions="Start" 
+                    VerticalOptions="Center" 
+                    Clicked="PickClicked" />
+
+            <Label Text="Top text..." 
+                   HorizontalOptions="Center" 
+                   VerticalOptions="Center" 
+                   TextColor="White" />
+
+            <Button Text="Take Photo" 
+                    HorizontalOptions="End" 
+                    VerticalOptions="Center" 
+                    Clicked="TakeClicked" />
 		</Grid>
 
 		<Grid

BigIslandBarcode/MainPage.xaml.cs

@@ -45,6 +45,16 @@ void SwitchCameraButton_Clicked(object sender, EventArgs e)
 		void TorchButton_Clicked(object sender, EventArgs e)
 		{
 			barcodeView.IsTorchOn = !barcodeView.IsTorchOn;
-		}
-	}
+        }
+
+        async void PickClicked(object sender, EventArgs e)
+        {
+            await Navigation.PushAsync(new PickImagePage());
+        }
+
+        async void TakeClicked(object sender, EventArgs e)
+        {
+            await Navigation.PushAsync(new TakeImagePage());
+        }
+    }
 }

BigIslandBarcode/PickImage.xaml

@@ -0,0 +1,56 @@
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+	xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+	xmlns:zxing="clr-namespace:ZXing.Net.Maui.Controls;assembly=ZXing.Net.MAUI.Controls"
+	xmlns:zxing2="clr-namespace:ZXing.Net.Maui;assembly=ZXing.Net.MAUI"
+	x:Class="BigIslandBarcode.PickImagePage"
+	BackgroundColor="#000000">
+
+    <ScrollView HorizontalOptions="CenterAndExpand">
+        <StackLayout Padding="0,30"
+                     Spacing="30"
+                     HorizontalOptions="CenterAndExpand">
+
+            <Button x:Name="PickButton"
+                    Text="Pick a Barcode"
+                    Clicked="PickClicked"
+                    HorizontalOptions="Center"/>
+
+            <Label x:Name="FileInfo"
+                   HorizontalTextAlignment="Center"
+                   HorizontalOptions="CenterAndExpand"/>
+
+            <Image x:Name="ImageOutput"
+                   WidthRequest="150"
+                   HeightRequest="150" />
+
+            <VerticalStackLayout x:Name="ActivityContainer"
+                         Spacing="30"
+                         HorizontalOptions="Center"
+                         IsVisible="False">
+
+                <ActivityIndicator x:Name="ActivityIndicator"
+                                   HorizontalOptions="Center"
+                                   Scale="1.5" />
+                <Label x:Name="ActivityLabel"
+                       HorizontalTextAlignment="Center"
+                       HorizontalOptions="Center"/>
+            </VerticalStackLayout>
+
+            <Label x:Name="ParseResult"
+                   HorizontalTextAlignment="Center"
+                   HorizontalOptions="CenterAndExpand"/>
+
+            <zxing:BarcodeGeneratorView
+				x:Name="barcodeGenerator"
+				HorizontalOptions="Center"
+				HeightRequest="100"
+				WidthRequest="150"
+				ForegroundColor="DarkBlue"
+				Format="QrCode"
+				BarcodeMargin="1"
+                IsVisible="False"/>
+
+        </StackLayout>
+    </ScrollView>
+
+</ContentPage>

BigIslandBarcode/PickImage.xaml.cs

@@ -0,0 +1,164 @@
+using System;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.Maui.ApplicationModel;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Storage;
+using ZXing.Net.Maui;
+using ZXing.Net.Maui.Readers;
+
+namespace BigIslandBarcode;
+
+public partial class PickImagePage : ContentPage
+{
+	readonly IBarcodeReader _reader;
+    bool _working = false;
+
+    public PickImagePage()
+	{
+		InitializeComponent();
+
+		_reader = 
+            new ZXingBarcodeReader
+            {
+                Options = new BarcodeReaderOptions
+                {
+                    Formats = BarcodeFormats.All,
+                    AutoRotate = true
+                }
+            };
+
+        NavigatedTo += PageNavigatedTo;
+    }
+
+    async void PageNavigatedTo(object? sender, NavigatedToEventArgs e)
+        => await CallFilePicker();
+
+    async void PickClicked(object sender, EventArgs e)
+        => await CallFilePicker();
+
+    async Task CallFilePicker()
+    {
+		if (!_working)
+		{
+			_working = true;
+
+			FileInfo.Text = "Awaiting file selection";
+			ParseResult.Text = "";
+			ImageOutput.Source = null;
+
+			try
+			{
+                var result =
+					await FilePicker.PickAsync(
+						new PickOptions
+						{
+							FileTypes = FilePickerFileType.Images,
+							PickerTitle = "Choose your barcode"
+						}
+					);
+
+                if (result == null)
+				{
+					FileInfo.Text = "No file selected";
+                    _working = false;
+				}
+				else
+                {
+                    ActivityContainer.IsVisible = true;
+                    ActivityIndicator.IsRunning = true;
+                    PickButton.IsEnabled = false;
+                    barcodeGenerator.IsVisible = false;
+
+                    var worker = new BackgroundWorker();
+                    worker.DoWork += Worker_DoWork;
+                    worker.RunWorkerCompleted += Worker_Completed;
+
+                    worker.RunWorkerAsync(result);
+                }
+            }
+			catch (Exception ex)
+			{
+				FileInfo.Text = $"Something's wrong: {ex.Message}";
+				ParseResult.Text = $"Something's wrong: {ex.Message}";
+
+                _working = false;
+			}
+        }
+		else
+        {
+			await DisplayAlert("Task Already Running", "Please cancel the runnning task first", "Okay");
+        }
+    }
+
+    async void Worker_DoWork(object? sender, DoWorkEventArgs e)
+    {
+        var fileResult = e.Argument as FileResult;
+        BarcodeResult? result = null;
+
+        var sW = new Stopwatch();
+
+        if (fileResult != null)
+        {
+
+            await MainThread.InvokeOnMainThreadAsync(() => ActivityLabel.Text = "Loading file");
+
+            using var stream = await fileResult.OpenReadAsync();
+
+            await MainThread.InvokeOnMainThreadAsync(() =>
+            {
+                FileInfo.Text = $"Name: {fileResult.FileName} - Size: {(stream.Length / 1024d):#.##} KiB";
+                ActivityLabel.Text = "Decoding";
+            });
+
+            sW.Start();
+
+            var decodeResult = _reader.Decode(stream);
+
+            sW.Stop();
+
+            result = decodeResult?.FirstOrDefault();
+        }
+
+        await MainThread.InvokeOnMainThreadAsync(() =>
+        {
+            if (fileResult != null)
+                ImageOutput.Source = ImageSource.FromFile(fileResult.FullPath);
+
+            if (result != null)
+            {
+                ParseResult.Text = $"Found Barcode (in {sW.ElapsedMilliseconds}ms)\nValue: {result.Value}";
+
+                try
+                {
+                    barcodeGenerator.Value = result.Value;
+                    barcodeGenerator.Format = result.Format;
+                    barcodeGenerator.IsVisible = true;
+                }
+                catch (Exception ex)
+                {
+                    ParseResult.Text += "\r\nError displaying barcode: " + ex.Message;
+                }
+            }
+            else
+            {
+                ParseResult.Text = $"No Barcode Found (in {sW.ElapsedMilliseconds}ms)";
+            }
+
+            Worker_Completed(true, null!);
+        });
+    }
+
+    void Worker_Completed(object? sender, RunWorkerCompletedEventArgs e)
+    {
+        if (sender is bool finished && finished == true)
+        {
+            ActivityContainer.IsVisible = false;
+            ActivityIndicator.IsRunning = false;
+            PickButton.IsEnabled = true;
+            _working = false;
+        }
+    }
+}

BigIslandBarcode/TakeImage.xaml

@@ -0,0 +1,56 @@
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+	xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+	xmlns:zxing="clr-namespace:ZXing.Net.Maui.Controls;assembly=ZXing.Net.MAUI.Controls"
+	xmlns:zxing2="clr-namespace:ZXing.Net.Maui;assembly=ZXing.Net.MAUI"
+	x:Class="BigIslandBarcode.TakeImagePage"
+	BackgroundColor="#000000">
+
+    <ScrollView HorizontalOptions="CenterAndExpand">
+        <StackLayout Padding="0,30"
+                     Spacing="30"
+                     HorizontalOptions="CenterAndExpand">
+
+            <Button x:Name="CaptureButton"
+                    Text="Take a picture of your barcode"
+                    Clicked="CaptureClicked"
+                    HorizontalOptions="Center"/>
+
+            <Label x:Name="FileInfo"
+                   HorizontalTextAlignment="Center"
+                   HorizontalOptions="CenterAndExpand"/>
+
+            <Image x:Name="ImageOutput"
+                   WidthRequest="150"
+                   HeightRequest="150" />
+
+            <VerticalStackLayout x:Name="ActivityContainer"
+                         Spacing="30"
+                         HorizontalOptions="Center"
+                         IsVisible="False">
+
+                <ActivityIndicator x:Name="ActivityIndicator"
+                                   HorizontalOptions="Center"
+                                   Scale="1.5" />
+                <Label x:Name="ActivityLabel"
+                       HorizontalTextAlignment="Center"
+                       HorizontalOptions="Center"/>
+            </VerticalStackLayout>
+
+            <Label x:Name="ParseResult"
+                   HorizontalTextAlignment="Center"
+                   HorizontalOptions="CenterAndExpand"/>
+
+            <zxing:BarcodeGeneratorView
+				x:Name="barcodeGenerator"
+				HorizontalOptions="Center"
+				HeightRequest="100"
+				WidthRequest="150"
+				ForegroundColor="DarkBlue"
+				Format="QrCode"
+				BarcodeMargin="1"
+                IsVisible="False"/>
+
+        </StackLayout>
+    </ScrollView>
+
+</ContentPage>