flutter_package / dart_pdf

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Hasan
Committed by GitHub
4aef6b80 1 parent f97471a5

fix: re-init UIPrinter cause issues with delegate (#1363) 

* fix: re-init UIPrinter cause issues with delegate

* change selectedPrinters to map of URL:UIPrinter
Inline Side-by-side
Showing 1 changed file with 97 additions and 75 deletions
... ... @@ -21,6 +21,10 @@ func dataProviderReleaseDataCallback(info _: UnsafeMutableRawPointer?, data: Uns
data.deallocate()
}
// A variable that holds the selected printers to prevent recreate it if selected again
// Each printer will be identified by its URL string
var selectedPrinters = [String: UIPrinter]()
public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate {
private var printing: PrintingPlugin
public var index: Int
... ... @@ -32,14 +36,14 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
private let semaphore = DispatchSemaphore(value: 0)
private var dynamic = false
private var currentSize: CGSize?
public init(printing: PrintingPlugin, index: Int) {
self.printing = printing
self.index = index
pdfDocument = nil
super.init()
}
override public func drawPage(at pageIndex: Int, in _: CGRect) {
let ctx = UIGraphicsGetCurrentContext()
let page = pdfDocument?.page(at: pageIndex + 1)
... ... @@ -49,7 +53,7 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
ctx?.drawPDFPage(page!)
}
}
func cancelJob(_ error: String?) {
pdfDocument = nil
if dynamic {
... ... @@ -58,23 +62,23 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
printing.onCompleted(printJob: self, completed: false, error: error as NSString?)
}
}
func setDocument(_ data: Data?) {
let bytesPointer = UnsafeMutablePointer<UInt8>.allocate(capacity: data?.count ?? 0)
data?.copyBytes(to: bytesPointer, count: data?.count ?? 0)
let dataProvider = CGDataProvider(dataInfo: nil, data: bytesPointer, size: data?.count ?? 0, releaseData: dataProviderReleaseDataCallback)
pdfDocument = CGPDFDocument(dataProvider!)
if dynamic {
// Unblock the main thread
semaphore.signal()
return
}
DispatchQueue.main.async { [self] in
let controller = UIPrintInteractionController.shared
controller.delegate = self
let printInfo = UIPrintInfo.printInfo()
printInfo.jobName = jobName!
printInfo.outputType = .general
... ... @@ -84,30 +88,35 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
}
controller.printInfo = printInfo
controller.printPageRenderer = self
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!)
printer.contactPrinter { available in
let printerURLString = printerURL!.absoluteString
if !selectedPrinters.keys.contains(printerURLString) {
selectedPrinters[printerURLString] = UIPrinter(url: printerURL!)
}
selectedPrinters[printerURLString]!.contactPrinter { available in
if !available {
self.printing.onCompleted(printJob: self, completed: false, error: "Printer not available")
return
}
controller.print(to: printer, completionHandler: self.completionHandler)
controller.print(to: selectedPrinters[printerURLString]!, completionHandler: self.completionHandler)
}
} else {
controller.present(animated: true, completionHandler: self.completionHandler)
}
}
}
override public var numberOfPages: Int {
if dynamic {
printing.onLayout(
... ... @@ -119,19 +128,19 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
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
}
func completionHandler(printController _: UIPrintInteractionController, completed: Bool, error: Error?) {
if !completed, error != nil {
print("Unable to print: \(error?.localizedDescription ?? "unknown error")")
}
printing.onCompleted(printJob: self, completed: completed, error: error?.localizedDescription as NSString?)
}
... ... @@ -144,7 +153,7 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
return bestPaper
}
func printPdf(name: String, withPageSize size: CGSize, andMargin margin: CGRect, withPrinter printerID: String?, dynamically dyn: Bool) {
currentSize = size
dynamic = dyn
... ... @@ -153,17 +162,17 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
self.printing.onCompleted(printJob: self, completed: false, error: "Printing not available")
return
}
if size.width > size.height {
orientation = UIPrintInfo.Orientation.landscape
}
jobName = name
printerName = printerID
let controller = UIPrintInteractionController.shared
controller.delegate = self
let printInfo = UIPrintInfo.printInfo()
printInfo.jobName = jobName!
printInfo.outputType = .general
... ... @@ -173,27 +182,40 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
}
controller.printInfo = printInfo
controller.showsPaperSelectionForLoadedPapers = true
controller.printPageRenderer = self
if printerID != nil {
let printerURL = URL(string: printerID!)
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: completionHandler)
let printerURLString = printerURL!.absoluteString
if !selectedPrinters.keys.contains(printerURLString) {
selectedPrinters[printerURLString] = UIPrinter(url: printerURL!)
}
selectedPrinters[printerURLString]!.contactPrinter { available in
if !available {
self.printing.onCompleted(printJob: self, completed: false, error: "Printer not available")
return
}
controller.print(to: selectedPrinters[printerURLString]!, completionHandler: self.completionHandler)
}
return
}
if dynamic {
controller.present(animated: true, completionHandler: completionHandler)
return
}
self.printing.onLayout(
printJob: self,
width: size.width,
... ... @@ -204,18 +226,18 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
marginBottom: size.height - margin.maxY
)
}
static func sharePdf(data: Data, withSourceRect rect: CGRect, andName name: String, subject: String?, body: String?) {
let tmpDirURL = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
let fileURL = tmpDirURL.appendingPathComponent(name)
do {
try data.write(to: fileURL, options: .atomic)
} catch {
print("sharePdf error: \(error.localizedDescription)")
return
}
let activityViewController = UIActivityViewController(activityItems: [fileURL, body as Any], applicationActivities: nil)
activityViewController.setValue(subject, forKey: "subject")
if UIDevice.current.userInterfaceIdiom == .pad {
... ... @@ -225,7 +247,7 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
}
UIApplication.shared.keyWindow?.rootViewController?.present(activityViewController, animated: true)
}
func convertHtml(_ data: String, withPageSize rect: CGRect, andMargin margin: CGRect, andBaseUrl baseUrl: URL?) {
let viewController = UIApplication.shared.delegate?.window?!.rootViewController
let wkWebView = WKWebView(frame: viewController!.view.bounds)
... ... @@ -233,32 +255,32 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
wkWebView.tag = 100
viewController?.view.addSubview(wkWebView)
wkWebView.loadHTMLString(data, baseURL: baseUrl ?? Bundle.main.bundleURL)
urlObservation = wkWebView.observe(\.isLoading, changeHandler: { _, _ in
// this is workaround for issue with loading local images
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
// assign the print formatter to the print page renderer
let renderer = UIPrintPageRenderer()
renderer.addPrintFormatter(wkWebView.viewPrintFormatter(), startingAtPageAt: 0)
// assign paperRect and printableRect values
renderer.setValue(rect, forKey: "paperRect")
renderer.setValue(margin, forKey: "printableRect")
// create pdf context and draw each page
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, rect, nil)
for i in 0 ..< renderer.numberOfPages {
UIGraphicsBeginPDFPage()
renderer.drawPage(at: i, in: UIGraphicsGetPDFContextBounds())
}
UIGraphicsEndPDFContext()
if let viewWithTag = viewController?.view.viewWithTag(wkWebView.tag) {
viewWithTag.removeFromSuperview() // remove hidden webview when pdf is generated
// clear WKWebView cache
if #available(iOS 9.0, *) {
WKWebsiteDataStore.default().fetchDataRecords(ofTypes: WKWebsiteDataStore.allWebsiteDataTypes()) { records in
... ... @@ -268,40 +290,40 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
}
}
}
// dispose urlObservation
self.urlObservation = nil
self.printing.onHtmlRendered(printJob: self, pdfData: pdfData as Data)
}
})
}
static func pickPrinter(result: @escaping FlutterResult, withSourceRect rect: CGRect) {
let controller = UIPrinterPickerController(initiallySelectedPrinter: nil)
let pickPrinterCompletionHandler: UIPrinterPickerController.CompletionHandler = {
(printerPickerController: UIPrinterPickerController, completed: Bool, error: Error?) in
if !completed, error != nil {
print("Unable to pick printer: \(error?.localizedDescription ?? "unknown error")")
result(nil)
return
}
if printerPickerController.selectedPrinter == nil {
result(nil)
return
}
let printer = printerPickerController.selectedPrinter!
let data: NSDictionary = [
"url": printer.url.absoluteString as Any,
"name": printer.displayName as Any,
"model": printer.makeAndModel as Any,
"location": printer.displayLocation as Any,
]
result(data)
if !completed, error != nil {
print("Unable to pick printer: \(error?.localizedDescription ?? "unknown error")")
result(nil)
return
}
if printerPickerController.selectedPrinter == nil {
result(nil)
return
}
let printer = printerPickerController.selectedPrinter!
let data: NSDictionary = [
"url": printer.url.absoluteString as Any,
"name": printer.displayName as Any,
"model": printer.makeAndModel as Any,
"location": printer.displayLocation as Any,
]
result(data)
}
if UIDevice.current.userInterfaceIdiom == .pad {
let viewController: UIViewController? = UIApplication.shared.keyWindow?.rootViewController
if viewController != nil {
... ... @@ -309,10 +331,10 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
return
}
}
controller.present(animated: true, completionHandler: pickPrinterCompletionHandler)
}
public func rasterPdf(data: Data, pages: [Int]?, scale: CGFloat) {
guard
let provider = CGDataProvider(data: data as CFData),
... ... @@ -321,10 +343,10 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
printing.onPageRasterEnd(printJob: self, error: "Cannot raster a malformed PDF file")
return
}
DispatchQueue.global().async {
let pageCount = document.numberOfPages
for pageNum in pages ?? Array(0 ... pageCount - 1) {
guard let page = document.page(at: pageNum + 1) else { continue }
let angle = CGFloat(page.rotationAngle) * CGFloat.pi / -180
... ... @@ -333,7 +355,7 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
let height = Int(abs((cos(angle) * rect.height + sin(angle) * rect.width) * scale))
let stride = width * 4
var data = Data(repeating: 0, count: stride * height)
data.withUnsafeMutableBytes { (outputBytes: UnsafeMutableRawBufferPointer) in
let rgb = CGColorSpaceCreateDeviceRGB()
let context = CGContext(
... ... @@ -345,7 +367,7 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
space: rgb,
bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
)
if context != nil {
context!.translateBy(x: CGFloat(width) / 2, y: CGFloat(height) / 2)
context!.scaleBy(x: scale, y: scale)
... ... @@ -354,18 +376,18 @@ public class PrintJob: UIPrintPageRenderer, UIPrintInteractionControllerDelegate
context!.drawPDFPage(page)
}
}
DispatchQueue.main.sync {
self.printing.onPageRasterized(printJob: self, imageData: data, width: width, height: height)
}
}
DispatchQueue.main.sync {
self.printing.onPageRasterEnd(printJob: self, error: nil)
}
}
}
public static func printingInfo() -> NSDictionary {
let data: NSDictionary = [
"directPrint": true,
... ...