Add dynamicLayout setting to prevent iOS to freeze

@@ -27,8 +27,10 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
     private var pdfDocument: CGPDFDocument?
     private var urlObservation: NSKeyValueObservation?
     private var jobName: String?
+    private var printerName: String?
     private var orientation: UIPrintInfo.Orientation?
     private let semaphore = DispatchSemaphore(value: 0)
+    private var dynamic = false
 
     public init(printing: PrintingPlugin, index: Int) {
         self.printing = printing
@@ -47,9 +49,13 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
         }
     }
 
-    func cancelJob(_: String?) {
+    func cancelJob(_ error: String?) {
         pdfDocument = nil
-        semaphore.signal()
+        if dynamic {
+            semaphore.signal()
+        } else {
+            printing.onCompleted(printJob: self, completed: false, error: error as NSString?)
+        }
     }
 
     func setDocument(_ data: Data?) {
@@ -58,23 +64,57 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
         let dataProvider = CGDataProvider(dataInfo: nil, data: bytesPointer, size: data?.count ?? 0, releaseData: dataProviderReleaseDataCallback)
         pdfDocument = CGPDFDocument(dataProvider!)
 
-        // Unblock the main thread
-        semaphore.signal()
+        if dynamic {
+            // Unblock the main thread
+            semaphore.signal()
+            return
+        }
+
+        let controller = UIPrintInteractionController.shared
+        controller.delegate = self
+
+        let printInfo = UIPrintInfo.printInfo()
+        printInfo.jobName = jobName!
+        printInfo.outputType = .general
+        if orientation != nil {
+            printInfo.orientation = orientation!
+            orientation = nil
+        }
+        controller.printInfo = printInfo
+        controller.printPageRenderer = self
+
+        DispatchQueue.main.async {
+            if self.printerName != nil {
+                let printerURL = URL(string: self.printerName!)
+
+                if printerURL == nil {
+                    self.printing.onCompleted(printJob: self, completed: false, error: "Unable to find printer URL")
+                    return
+                }
+
+                let printer = UIPrinter(url: printerURL!)
+                controller.print(to: printer, completionHandler: self.completionHandler)
+            } else {
+                controller.present(animated: true, completionHandler: self.completionHandler)
+            }
+        }
     }
 
     override public var numberOfPages: Int {
-        printing.onLayout(
-            printJob: self,
-            width: paperRect.size.width,
-            height: paperRect.size.height,
-            marginLeft: printableRect.origin.x,
-            marginTop: printableRect.origin.y,
-            marginRight: paperRect.size.width - (printableRect.origin.x + printableRect.size.width),
-            marginBottom: paperRect.size.height - (printableRect.origin.y + printableRect.size.height)
-        )
-
-        // Block the main thread, waiting for a document
-        semaphore.wait()
+        if dynamic {
+            printing.onLayout(
+                printJob: self,
+                width: paperRect.size.width,
+                height: paperRect.size.height,
+                marginLeft: printableRect.origin.x,
+                marginTop: printableRect.origin.y,
+                marginRight: paperRect.size.width - (printableRect.origin.x + printableRect.size.width),
+                marginBottom: paperRect.size.height - (printableRect.origin.y + printableRect.size.height)
+            )
+
+            // Block the main thread, waiting for a document
+            semaphore.wait()
+        }
 
         return pdfDocument?.numberOfPages ?? 0
     }
@@ -87,7 +127,8 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
         printing.onCompleted(printJob: self, completed: completed, error: error?.localizedDescription as NSString?)
     }
 
-    func printPdf(name: String, withPageSize size: CGSize, andMargin _: CGRect, withPrinter printerID: String?) {
+    func printPdf(name: String, withPageSize size: CGSize, andMargin margin: CGRect, withPrinter printerID: String?, dynamically dyn: Bool) {
+        dynamic = dyn
         let printing = UIPrintInteractionController.isPrintingAvailable
         if !printing {
             self.printing.onCompleted(printJob: self, completed: false, error: "Printing not available")
@@ -99,6 +140,7 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
         }
 
         jobName = name
+        printerName = printerID
 
         let controller = UIPrintInteractionController.shared
         controller.delegate = self
@@ -128,7 +170,20 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
             return
         }
 
-        controller.present(animated: true, completionHandler: completionHandler)
+        if dynamic {
+            controller.present(animated: true, completionHandler: completionHandler)
+            return
+        }
+
+        self.printing.onLayout(
+            printJob: self,
+            width: size.width,
+            height: size.height,
+            marginLeft: margin.minX,
+            marginTop: margin.minY,
+            marginRight: size.width - margin.maxX,
+            marginBottom: size.height - margin.maxY
+        )
     }
 
     static func sharePdf(data: Data, withSourceRect rect: CGRect, andName name: String) {

@@ -59,6 +59,7 @@ public class PrintingPlugin: NSObject, FlutterPlugin {
             let marginRight = CGFloat((args["marginRight"] as! NSNumber).floatValue)
             let marginBottom = CGFloat((args["marginBottom"] as! NSNumber).floatValue)
             let printJob = PrintJob(printing: self, index: args["job"] as! Int)
+            let dynamic = args["dynamic"] as! Bool
             jobs[args["job"] as! UInt32] = printJob
             printJob.printPdf(name: name,
                               withPageSize: CGSize(
@@ -70,7 +71,8 @@ public class PrintingPlugin: NSObject, FlutterPlugin {
                                   y: marginTop,
                                   width: width - marginRight - marginLeft,
                                   height: height - marginBottom - marginTop
-                              ), withPrinter: printer)
+                              ), withPrinter: printer,
+                              dynamically: dynamic)
             result(NSNumber(value: 1))
         } else if call.method == "sharePdf" {
             let object = args["doc"] as! FlutterStandardTypedData

@@ -64,6 +64,7 @@ abstract class PrintingPlatform extends PlatformInterface {
     LayoutCallback onLayout,
     String name,
     PdfPageFormat format,
+    bool dynamicLayout,
   );
 
   /// Enumerate the available printers on the system.

@@ -142,6 +142,7 @@ class MethodChannelPrinting extends PrintingPlatform {
     LayoutCallback onLayout,
     String name,
     PdfPageFormat format,
+    bool dynamicLayout,
   ) async {
     final job = _printJobs.add(
       onCompleted: Completer<bool>(),
@@ -158,6 +159,7 @@ class MethodChannelPrinting extends PrintingPlatform {
       'marginTop': format.marginTop,
       'marginRight': format.marginRight,
       'marginBottom': format.marginBottom,
+      'dynamic': dynamicLayout,
     };
 
     await _channel.invokeMethod<int>('printPdf', params);

@@ -34,6 +34,7 @@ class PdfPreview extends StatefulWidget {
     this.pdfFileName,
     this.useActions = true,
     this.pages,
+    this.dynamicLayout = true,
   }) : super(key: key);
 
   /// Called when a pdf document is needed
@@ -90,6 +91,11 @@ class PdfPreview extends StatefulWidget {
   /// Pages to display. Default will display all the pages.
   final List<int>? pages;
 
+  /// Request page re-layout to match the printer paper and margins.
+  /// Mitigate an issue with iOS and macOS print dialog that prevent any
+  /// channel message while opened.
+  final bool dynamicLayout;
+
   @override
   _PdfPreviewState createState() => _PdfPreviewState();
 }
@@ -512,6 +518,7 @@ class _PdfPreviewState extends State<PdfPreview> {
         onLayout: widget.build,
         name: widget.pdfFileName ?? 'Document',
         format: format,
+        dynamicLayout: widget.dynamicLayout,
       );
 
       if (result && widget.onPrinted != null) {

@@ -40,12 +40,14 @@ mixin Printing {
     required LayoutCallback onLayout,
     String name = 'Document',
     PdfPageFormat format = PdfPageFormat.standard,
+    bool dynamicLayout = true,
   }) {
     return PrintingPlatform.instance.layoutPdf(
       null,
       onLayout,
       name,
       format,
+      dynamicLayout,
     );
   }
 
@@ -122,12 +124,14 @@ mixin Printing {
     required LayoutCallback onLayout,
     String name = 'Document',
     PdfPageFormat format = PdfPageFormat.standard,
+    bool dynamicLayout = true,
   }) {
     return PrintingPlatform.instance.layoutPdf(
       printer,
       onLayout,
       name,
       format,
+      dynamicLayout,
     );
   }
 

@@ -30,6 +30,7 @@ public class PrintJob: NSView, NSSharingServicePickerDelegate {
     private var pdfDocument: CGPDFDocument?
     private var page: CGPDFPage?
     private let semaphore = DispatchSemaphore(value: 0)
+    private var dynamic = false
 
     public init(printing: PrintingPlugin, index: Int) {
         self.printing = printing
@@ -49,18 +50,20 @@ public class PrintJob: NSView, NSSharingServicePickerDelegate {
         setFrameSize(size)
         setBoundsSize(size)
 
-        printing.onLayout(
-            printJob: self,
-            width: printOperation!.printInfo.paperSize.width,
-            height: printOperation!.printInfo.paperSize.height,
-            marginLeft: printOperation!.printInfo.leftMargin,
-            marginTop: printOperation!.printInfo.topMargin,
-            marginRight: printOperation!.printInfo.rightMargin,
-            marginBottom: printOperation!.printInfo.bottomMargin
-        )
-
-        // Block the main thread, waiting for a document
-        semaphore.wait()
+        if dynamic {
+            printing.onLayout(
+                printJob: self,
+                width: printOperation!.printInfo.paperSize.width,
+                height: printOperation!.printInfo.paperSize.height,
+                marginLeft: printOperation!.printInfo.leftMargin,
+                marginTop: printOperation!.printInfo.topMargin,
+                marginRight: printOperation!.printInfo.rightMargin,
+                marginBottom: printOperation!.printInfo.bottomMargin
+            )
+
+            // Block the main thread, waiting for a document
+            semaphore.wait()
+        }
 
         if pdfDocument != nil {
             range.pointee.length = pdfDocument!.numberOfPages
@@ -90,8 +93,16 @@ public class PrintJob: NSView, NSSharingServicePickerDelegate {
         let dataProvider = CGDataProvider(dataInfo: nil, data: bytesPointer, size: data?.count ?? 0, releaseData: dataProviderReleaseDataCallback)
         pdfDocument = CGPDFDocument(dataProvider!)
 
-        // Unblock the main thread
-        semaphore.signal()
+        if dynamic {
+            // Unblock the main thread
+            semaphore.signal()
+            return
+        }
+
+        DispatchQueue.main.async {
+            let window = NSApplication.shared.mainWindow!
+            self.printOperation!.runModal(for: window, delegate: self, didRun: #selector(self.printOperationDidRun(printOperation:success:contextInfo:)), contextInfo: nil)
+        }
     }
 
     override public func draw(_: NSRect) {
@@ -119,7 +130,8 @@ public class PrintJob: NSView, NSSharingServicePickerDelegate {
         return printers
     }
 
-    public func printPdf(name: String, withPageSize size: CGSize, andMargin _: CGRect, withPrinter printer: String?) {
+    public func printPdf(name: String, withPageSize size: CGSize, andMargin _: CGRect, withPrinter printer: String?, dynamically dyn: Bool) {
+        dynamic = dyn
         let sharedInfo = NSPrintInfo.shared
         let sharedDict = sharedInfo.dictionary()
         let printInfoDict = NSMutableDictionary(dictionary: sharedDict)
@@ -133,20 +145,38 @@ public class PrintJob: NSView, NSSharingServicePickerDelegate {
         // Print the custom view
         printOperation = NSPrintOperation(view: self, printInfo: printInfo)
         printOperation!.jobTitle = name
-        printOperation!.printPanel.options = [.showsPreview, .showsPaperSize, .showsOrientation]
+        printOperation!.printPanel.options = [.showsPreview]
         if printer != nil {
             printInfo.printer = NSPrinter(name: printer!)!
             printOperation!.showsPrintPanel = false
             printOperation!.showsProgressPanel = false
         }
 
-        let window = NSApplication.shared.mainWindow!
-        printOperation!.runModal(for: window, delegate: self, didRun: #selector(printOperationDidRun(printOperation:success:contextInfo:)), contextInfo: nil)
+        if dynamic {
+            let window = NSApplication.shared.mainWindow!
+            printOperation!.printPanel.options = [.showsPreview, .showsPaperSize, .showsOrientation]
+            printOperation!.runModal(for: window, delegate: self, didRun: #selector(printOperationDidRun(printOperation:success:contextInfo:)), contextInfo: nil)
+            return
+        }
+
+        printing.onLayout(
+            printJob: self,
+            width: printOperation!.printInfo.paperSize.width,
+            height: printOperation!.printInfo.paperSize.height,
+            marginLeft: printOperation!.printInfo.leftMargin,
+            marginTop: printOperation!.printInfo.topMargin,
+            marginRight: printOperation!.printInfo.rightMargin,
+            marginBottom: printOperation!.printInfo.bottomMargin
+        )
     }
 
-    func cancelJob(_: String?) {
+    func cancelJob(_ error: String?) {
         pdfDocument = nil
-        semaphore.signal()
+        if dynamic {
+            semaphore.signal()
+        } else {
+            printing.onCompleted(printJob: self, completed: false, error: error as NSString?)
+        }
     }
 
     public static func sharePdf(data: Data, withSourceRect rect: CGRect, andName name: String) {

@@ -59,6 +59,7 @@ public class PrintingPlugin: NSObject, FlutterPlugin {
             let marginRight = CGFloat((args["marginRight"] as! NSNumber).floatValue)
             let marginBottom = CGFloat((args["marginBottom"] as! NSNumber).floatValue)
             let printJob = PrintJob(printing: self, index: args["job"] as! Int)
+            let dynamic = args["dynamic"] as! Bool
             jobs[args["job"] as! UInt32] = printJob
             printJob.printPdf(name: name,
                               withPageSize: CGSize(
@@ -70,7 +71,8 @@ public class PrintingPlugin: NSObject, FlutterPlugin {
                                   y: marginTop,
                                   width: width - marginRight - marginLeft,
                                   height: height - marginBottom - marginTop
-                              ), withPrinter: printer)
+                              ), withPrinter: printer,
+                              dynamically: dynamic)
             result(NSNumber(value: 1))
         } else if call.method == "listPrinters" {
             let printJob = PrintJob(printing: self, index: -1)

@@ -113,6 +113,7 @@ class MockPrinting extends Mock
     LayoutCallback onLayout,
     String name,
     PdfPageFormat format,
+    bool dynamicLayout,
   ) async =>
       true;