88 lines
2.9 KiB
C#
88 lines
2.9 KiB
C#
using CloudPrint.Client.Models;
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using System.Drawing;
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using System.Drawing.Printing;
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using System.IO;
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namespace CloudPrint.Client.Services.Printing;
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public sealed class ImagePrintJobExecutor : IPrintJobExecutor
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{
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private readonly IWindowsPrintQueueService _queueService;
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private static readonly HashSet<string> SupportedExtensions = new(StringComparer.OrdinalIgnoreCase)
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{
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".jpg", ".jpeg", ".png", ".bmp", ".gif"
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};
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public ImagePrintJobExecutor(IWindowsPrintQueueService queueService)
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{
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_queueService = queueService;
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}
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public bool CanHandle(PrintJob job)
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{
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return SupportedExtensions.Contains(Path.GetExtension(job.FilePath));
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}
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public Task ExecuteAsync(PrintJob job, IProgress<int>? progress, CancellationToken cancellationToken = default)
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{
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PrintFileGuards.EnsurePrintableFile(job);
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return Task.Run(() =>
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{
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cancellationToken.ThrowIfCancellationRequested();
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using var image = Image.FromFile(job.FilePath);
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using var document = new PrintDocument
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{
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DocumentName = string.IsNullOrWhiteSpace(job.FileName) ? job.JobNo : job.FileName,
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PrinterSettings =
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{
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PrinterName = job.PrinterName,
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Copies = (short)Math.Clamp(job.Copies, 1, short.MaxValue)
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}
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};
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if (document.PrinterSettings.CanDuplex)
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{
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document.PrinterSettings.Duplex = job.Duplex ? Duplex.Vertical : Duplex.Simplex;
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}
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document.DefaultPageSettings.Color = job.Color;
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document.PrintPage += (_, args) => DrawImageToPage(image, args);
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progress?.Report(20);
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document.Print();
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CaptureWindowsJob(job, document.DocumentName);
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progress?.Report(100);
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}, cancellationToken);
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}
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private void CaptureWindowsJob(PrintJob job, string documentName)
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{
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var queueJob = _queueService.FindLatestJob(job.PrinterName, documentName);
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if (queueJob is null)
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{
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return;
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}
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job.WindowsJobId = queueJob.JobId;
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job.WindowsJobStatus = queueJob.Status;
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}
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private static void DrawImageToPage(Image image, PrintPageEventArgs args)
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{
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if (args.Graphics is null)
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{
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throw new InvalidOperationException("打印图形上下文不可用");
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}
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var bounds = args.MarginBounds;
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var ratio = Math.Min(bounds.Width / (double)image.Width, bounds.Height / (double)image.Height);
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var width = (int)(image.Width * ratio);
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var height = (int)(image.Height * ratio);
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var x = bounds.Left + (bounds.Width - width) / 2;
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var y = bounds.Top + (bounds.Height - height) / 2;
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args.Graphics.DrawImage(image, x, y, width, height);
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args.HasMorePages = false;
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}
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} |