Cross-platform port: WPF → Avalonia 12 + .NET 10 (Windows/macOS/Linux)

.github/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  push:
+    branches: [main, migrate-to-avalonia]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
+        with:
+          global-json-file: global.json
+      - name: Restore
+        run: dotnet restore
+      - name: Build
+        run: dotnet build -c Release --no-restore

.github/workflows/release.yml

@@ -0,0 +1,93 @@
+name: Release
+
+# Builds self-contained apps for Windows, Linux and macOS and publishes them to a GitHub Release.
+# Trigger by pushing a tag like `v1.2.3`, or run manually (workflow_dispatch) to just build artifacts.
+
+on:
+  push:
+    tags: ['v*']
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    name: Build ${{ matrix.rid }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { rid: win-x64,   os: ubuntu-latest, kind: zip }
+          - { rid: linux-x64, os: ubuntu-latest, kind: targz }
+          - { rid: osx-x64,   os: macos-latest,  kind: app }
+          - { rid: osx-arm64, os: macos-latest,  kind: app }
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-dotnet@v4
+        with:
+          global-json-file: global.json
+
+      - name: Determine version
+        id: ver
+        shell: bash
+        run: |
+          VER=1.0.0
+          if [ "$GITHUB_REF_TYPE" = "tag" ]; then VER="${GITHUB_REF_NAME#v}"; fi
+          echo "version=$VER" >> "$GITHUB_OUTPUT"
+
+      - name: Publish (self-contained)
+        run: >
+          dotnet publish ReceiptPrinterEmulator.csproj
+          -c Release
+          -r ${{ matrix.rid }}
+          --self-contained true
+          -p:PublishSingleFile=false
+          -p:Version=${{ steps.ver.outputs.version }}
+          -o publish/${{ matrix.rid }}
+
+      - name: Package — zip (Windows)
+        if: matrix.kind == 'zip'
+        run: |
+          cd publish/${{ matrix.rid }}
+          zip -r ../../ReceiptPrinterEmulator-${{ matrix.rid }}.zip .
+
+      - name: Package — tar.gz (Linux)
+        if: matrix.kind == 'targz'
+        run: tar -czf ReceiptPrinterEmulator-${{ matrix.rid }}.tar.gz -C publish/${{ matrix.rid }} .
+
+      - name: Package — .app bundle (macOS)
+        if: matrix.kind == 'app'
+        run: |
+          chmod +x scripts/make-macos-app.sh
+          scripts/make-macos-app.sh publish/${{ matrix.rid }} dist "${{ steps.ver.outputs.version }}"
+          ditto -c -k --keepParent dist/ReceiptPrinterEmulator.app ReceiptPrinterEmulator-${{ matrix.rid }}.zip
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.rid }}
+          path: |
+            ReceiptPrinterEmulator-${{ matrix.rid }}.zip
+            ReceiptPrinterEmulator-${{ matrix.rid }}.tar.gz
+          if-no-files-found: ignore
+
+  release:
+    name: Create GitHub Release
+    needs: build
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: artifacts
+
+      - name: List artifacts
+        run: find artifacts -type f
+
+      - uses: softprops/action-gh-release@v2
+        with:
+          files: artifacts/**/*
+          generate_release_notes: true
+          fail_on_unmatched_files: false

.gitignore

@@ -5,3 +5,8 @@ riderModule.iml
 /_ReSharper.Caches/
 /.vs
 /.idea/
+
+# Runtime debug dumps written by ReceiptPrinter.FeedEscPos
+last_escpos_receive.txt
+last_ticket.bin
+last_*.txt

App.axaml

@@ -0,0 +1,10 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="ReceiptPrinterEmulator.App"
+             RequestedThemeVariant="Dark">
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+
+</Application>

App.axaml.cs

@@ -0,0 +1,61 @@
+using System;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
+using ReceiptPrinterEmulator.Emulator;
+using ReceiptPrinterEmulator.Services;
+using ReceiptPrinterEmulator.ViewModels;
+using ReceiptPrinterEmulator.Views;
+
+namespace ReceiptPrinterEmulator;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            var printer = new ReceiptPrinter(PaperConfiguration.Default);
+            // Marshal off-thread state mutations (e.g. a drawer kick over TCP) to the UI thread.
+            printer.UiDispatch = a => Dispatcher.UIThread.Post(a);
+            var notifications = new NotificationService();
+            var dialogs = new FileDialogService();
+
+            // Initial transport settings come from environment variables; the UI can change them at
+            // runtime. ESCPOS_TCP_PORT ("off"/"0" disables auto-start), ESCPOS_SERIAL_PORT / _BAUD.
+            var (tcpEnabled, tcpPort) = ReadTcpSettings();
+            var serialPort = Environment.GetEnvironmentVariable("ESCPOS_SERIAL_PORT");
+            int serialBaud = int.TryParse(Environment.GetEnvironmentVariable("ESCPOS_SERIAL_BAUD"), out var b) ? b : 9600;
+            var listenAddress = Environment.GetEnvironmentVariable("ESCPOS_LISTEN_ADDRESS") ?? "0.0.0.0";
+
+            var viewModel = new MainWindowViewModel(printer, notifications, dialogs,
+                listenAddress, tcpPort, tcpEnabled,
+                string.IsNullOrWhiteSpace(serialPort) ? null : serialPort, serialBaud);
+
+            var window = new MainWindow { DataContext = viewModel };
+            notifications.AttachWindow(window);
+            dialogs.AttachTopLevel(window); // Window is a TopLevel
+            desktop.MainWindow = window;
+
+            desktop.ShutdownRequested += (_, _) => viewModel.Shutdown();
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    private static (bool enabled, int port) ReadTcpSettings()
+    {
+        var setting = Environment.GetEnvironmentVariable("ESCPOS_TCP_PORT");
+        if (setting is "off" or "none" or "disabled" or "0")
+            return (false, 9100);
+
+        int port = int.TryParse(setting, out var p) && p > 0 ? p : 9100;
+        return (true, port);
+    }
+}

Assets/Fonts/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2020 The JetBrains Mono Project Authors (https://github.com/JetBrains/JetBrainsMono)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

Emulator/Abstraction/IPrinterResponder.cs

@@ -0,0 +1,11 @@
+namespace ReceiptPrinterEmulator.Emulator.Abstraction;
+
+/// <summary>
+/// A channel the printer can write bytes back to the host over (TCP client or serial port).
+/// Implemented by the transports so status / transmit-back commands can reply to the host that
+/// sent the request.
+/// </summary>
+public interface IPrinterResponder
+{
+    void Send(byte[] data);
+}

Emulator/Abstraction/IReceiptPrintable.cs

@@ -1,9 +1,13 @@
-using System.Drawing;
+using SkiaSharp;
 
 namespace ReceiptPrinterEmulator.Emulator.Abstraction;
 
 public interface IReceiptPrintable
 {
-    public void Render(Bitmap bitmap, Graphics g, int offsetX, int offsetY);
+    /// <summary>
+    /// Draws this line onto the receipt canvas at the given top-left offset.
+    /// </summary>
+    public void Render(SKCanvas canvas, int offsetX, int offsetY);
+
     public int GetPrintHeight();
-}
+}

Emulator/Enums/HriPosition.cs

@@ -0,0 +1,12 @@
+namespace ReceiptPrinterEmulator.Emulator.Enums;
+
+/// <summary>
+/// Human Readable Interpretation (HRI) text position for 1D barcodes (ESC/POS GS H).
+/// </summary>
+public enum HriPosition
+{
+    None = 0,
+    Above = 1,
+    Below = 2,
+    Both = 3
+}