Use own Pdf viewer implementation. wip on universal InfoPanel

QuickLook.Plugin.PDFViewer/Plugin.cs

@@ -0,0 +1,53 @@
+using System.IO;
+using System.Text;
+
+namespace QuickLook.Plugin.PDFViewer
+{
+    public class Plugin : IViewer
+    {
+        private PdfViewerControl _pdfControl;
+        public int Priority => 9999;
+
+        public bool CanHandle(string path)
+        {
+            if (Directory.Exists(path))
+                return false;
+
+            if (File.Exists(path) && Path.GetExtension(path).ToLower() == ".pdf")
+                return true;
+
+            using (var br = new BinaryReader(new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
+            {
+                return Encoding.ASCII.GetString(br.ReadBytes(4)) == "%PDF";
+            }
+        }
+
+        public void View(string path, ViewContentContainer container)
+        {
+            _pdfControl = new PdfViewerControl();
+
+            var desiredSize = _pdfControl.GetDesiredControlSizeByFirstPage(path);
+
+            desiredSize.Width += 150; // add thumbnails column
+
+            container.SetPreferedSizeFit(desiredSize, 0.7);
+
+            container.SetContent(_pdfControl);
+
+            _pdfControl.Loaded += (sender, e) =>
+            {
+                _pdfControl.LoadPdf(path);
+
+                container.Title = $"{Path.GetFileName(path)} (1 / {_pdfControl.TotalPages})";
+                _pdfControl.CurrentPageChanged += (sender2, e2) => container.Title =
+                    $"{Path.GetFileName(path)} ({_pdfControl.CurrectPage + 1} / {_pdfControl.TotalPages})";
+            };
+        }
+
+        public void Close()
+        {
+            _pdfControl.Dispose();
+            _pdfControl = null;
+        }
+    }
+}