Improve Linux and Windows printing

@@ -27,6 +27,7 @@ class PdfPreview extends StatefulWidget {
     this.pageFormats,
     this.onError,
     this.onPrinted,
+    this.onPrintError,
     this.onShared,
     this.scrollViewDecoration,
     this.pdfPreviewPageDecoration,
@@ -65,12 +66,15 @@ class PdfPreview extends StatefulWidget {
   /// List of page formats the user can choose
   final Map<String, PdfPageFormat>? pageFormats;
 
-  /// Called if an error creating the Pdf occured
+  /// Widget to display if the PDF document cannot be displayed
   final Widget Function(BuildContext context)? onError;
 
   /// Called if the user prints the pdf document
   final void Function(BuildContext context)? onPrinted;
 
+  /// Called if an error creating the Pdf occured
+  final void Function(BuildContext context, dynamic error)? onPrintError;
+
   /// Called if the user shares the pdf document
   final void Function(BuildContext context)? onShared;
 
@@ -514,8 +518,8 @@ class _PdfPreviewState extends State<PdfPreview> {
         widget.onPrinted!(context);
       }
     } catch (e) {
-      if (widget.onError != null) {
-        widget.onError!(context);
+      if (widget.onPrintError != null) {
+        widget.onPrintError!(context, e);
       }
     }
   }

@@ -138,29 +138,34 @@ bool print_job::print_pdf(const gchar* name,
         GTK_PRINT_UNIX_DIALOG(gtk_print_unix_dialog_new(name, nullptr));
     gtk_print_unix_dialog_set_manual_capabilities(
         dialog, (GtkPrintCapabilities)(GTK_PRINT_CAPABILITY_GENERATE_PDF));
+    gtk_print_unix_dialog_set_embed_page_setup(dialog, true);
+    gtk_print_unix_dialog_set_support_selection(dialog, false);
 
     gtk_widget_realize(GTK_WIDGET(dialog));
 
-    auto response = gtk_dialog_run(GTK_DIALOG(dialog));
-    gtk_widget_hide(GTK_WIDGET(dialog));
-
-    switch (response) {
-      case GTK_RESPONSE_OK: {
-        _printer = gtk_print_unix_dialog_get_selected_printer(
-            GTK_PRINT_UNIX_DIALOG(dialog));
-        settings =
-            gtk_print_unix_dialog_get_settings(GTK_PRINT_UNIX_DIALOG(dialog));
-        setup =
-            gtk_print_unix_dialog_get_page_setup(GTK_PRINT_UNIX_DIALOG(dialog));
-        gtk_widget_destroy(GTK_WIDGET(dialog));
-      } break;
-      case GTK_RESPONSE_DELETE_EVENT:  // Fall through.
-      case GTK_RESPONSE_CANCEL:        // Cancel
-      case GTK_RESPONSE_APPLY:         // Preview
-      default:
-        gtk_widget_destroy(GTK_WIDGET(dialog));
-        on_completed(this, false, nullptr);
-        return true;
+    auto loop = true;
+
+    while (loop) {
+      auto response = gtk_dialog_run(GTK_DIALOG(dialog));
+
+      switch (response) {
+        case GTK_RESPONSE_OK: {
+          _printer = gtk_print_unix_dialog_get_selected_printer(
+              GTK_PRINT_UNIX_DIALOG(dialog));
+          settings =
+              gtk_print_unix_dialog_get_settings(GTK_PRINT_UNIX_DIALOG(dialog));
+          setup = gtk_print_unix_dialog_get_page_setup(
+              GTK_PRINT_UNIX_DIALOG(dialog));
+          gtk_widget_destroy(GTK_WIDGET(dialog));
+          loop = false;
+        } break;
+        case GTK_RESPONSE_APPLY:  // Preview
+          break;
+        default:  // Cancel
+          gtk_widget_destroy(GTK_WIDGET(dialog));
+          on_completed(this, false, nullptr);
+          return true;
+      }
     }
   }
 
@@ -172,8 +177,8 @@ bool print_job::print_pdf(const gchar* name,
     return false;
   }
 
-  auto _width = gtk_page_setup_get_page_width(setup, GTK_UNIT_POINTS);
-  auto _height = gtk_page_setup_get_page_height(setup, GTK_UNIT_POINTS);
+  auto _width = gtk_page_setup_get_paper_width(setup, GTK_UNIT_POINTS);
+  auto _height = gtk_page_setup_get_paper_height(setup, GTK_UNIT_POINTS);
   auto _marginLeft = gtk_page_setup_get_left_margin(setup, GTK_UNIT_POINTS);
   auto _marginTop = gtk_page_setup_get_top_margin(setup, GTK_UNIT_POINTS);
   auto _marginRight = gtk_page_setup_get_right_margin(setup, GTK_UNIT_POINTS);

@@ -71,7 +71,7 @@ std::wstring fromUtf8(std::string str) {
 }
 
 PrintJob::PrintJob(Printing* printing, int index)
-    : printing(printing), index(index) {}
+    : printing{printing}, index{index} {}
 
 bool PrintJob::printPdf(std::string name, std::string printer) {
   documentName = name;
@@ -102,11 +102,18 @@ bool PrintJob::printPdf(std::string name, std::string printer) {
 
     auto r = PrintDlg(&pd);
 
-    if (r == 1) {
+    if (r != 1) {
+      printing->onCompleted(this, false, "");
+        DeleteDC(hDC);
+  GlobalFree(hDevNames);
+  ClosePrinter(hDevMode);
+      return true;
+    }
+
       hDC = pd.hDC;
       hDevMode = pd.hDevMode;
       hDevNames = pd.hDevNames;
-    }
+
   } else {
     hDC = CreateDC(TEXT("WINSPOOL"), fromUtf8(printer).c_str(), NULL, NULL);
     if (!hDC) {
@@ -235,6 +242,8 @@ void PrintJob::writeJob(std::vector<uint8_t> data) {
   DeleteDC(hDC);
   GlobalFree(hDevNames);
   ClosePrinter(hDevMode);
+
+  printing->onCompleted(this, true, "");
 }
 
 void PrintJob::cancelJob(std::string error) {}

@@ -55,7 +55,7 @@ void Printing::onPageRasterEnd(PrintJob* job) {
 
 class OnLayoutResult : public flutter::MethodResult<flutter::EncodableValue> {
  public:
-  OnLayoutResult(PrintJob* job) : job(job) {}
+  OnLayoutResult(PrintJob* job) : job{job} {}
 
  private:
   PrintJob* job;