Merge pull request #5 from hansemannn/feature/swift

feat: move to Swift, extend "pdfFromAllPages" API

Classes/TiScanner.h

@@ -0,0 +1,17 @@
+//
+//  TiScanner.h
+//  titanium-scanner
+//
+//  Created by Your Name
+//  Copyright (c) 2021 Your Company. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+//! Project version number for TiScanner.
+FOUNDATION_EXPORT double TiScannerVersionNumber;
+
+//! Project version string for TiScanner.
+FOUNDATION_EXPORT const unsigned char TiScannerVersionString[];
+
+#import "TiScannerModuleAssets.h"

Classes/TiScannerModule.swift

@@ -0,0 +1,175 @@
+//
+//  TiScannerModule.swift
+//  titanium-scanner
+//
+//  Created by Your Name
+//  Copyright (c) 2021 Your Company. All rights reserved.
+//
+
+import UIKit
+import TitaniumKit
+import Vision
+import VisionKit
+import PDFKit
+
+@objc(TiScannerModule)
+class TiScannerModule: TiModule {
+
+  lazy var scanner: VNDocumentCameraViewController? = {
+    let scannerViewController = VNDocumentCameraViewController()
+    scannerViewController.delegate = self
+
+    return scannerViewController
+  }()
+
+  var currentScan: VNDocumentCameraScan?
+
+  func moduleGUID() -> String {
+    return "fc40b436-6d90-4cf0-9627-f56e4321b30f"
+  }
+
+  override func moduleId() -> String! {
+    return "ti.scanner"
+  }
+
+  func dismissAndCleanup() {
+    scanner?.dismiss(animated: true, completion: nil)
+    scanner?.delegate = nil
+    scanner = nil
+  }
+
+  // MARK: Public APIs
+
+  @objc(isSupported:)
+  func isSupported(unused: [Any]?) -> Bool {
+    return VNDocumentCameraViewController.isSupported
+  }
+
+  @objc(showScanner:)
+  func showScanner(unused: [Any]?) {
+    if let scanner = scanner {
+      TiApp.controller().present(scanner, animated: true, completion: nil)
+    }
+  }
+
+  @objc(imageOfPageAtIndex:)
+  func imageOfPageAtIndex(args: [Any]) -> TiBlob? {
+    guard let index = args.first as? Int, let scan = currentScan else { return nil }
+
+    let image = scan.imageOfPage(at: index)
+    return TiBlob(image: image)
+  }
+
+  @objc(pdfOfPageAtIndex:)
+  func pdfOfPageAtIndex(args: [Any]) -> TiBlob? {
+    guard let index = args.first as? Int, let scan = currentScan else { return nil }
+
+    let image = scan.imageOfPage(at: index)
+    let pdfDocument = PDFDocument()
+
+    if let pdfPage = PDFPage(image: image) {
+      pdfDocument.insert(pdfPage, at: 0)
+    }
+
+    return TiBlob(data: pdfDocument.dataRepresentation(), mimetype: "application/pdf")
+  }
+
+  @objc(pdfOfAllPages:)
+  func pdfOfAllPages(args: [Any]?) -> TiBlob? {
+    guard let scan = currentScan else { return nil }
+
+    var resizeImages = false
+    var padding = 80
+
+    if let params = args?.first as? [String: Any] {
+      resizeImages = params["resizeImages"] as? Bool ?? false
+      padding = params["padding"] as? Int ?? 80
+    }
+
+    let pdfDocument = PDFDocument()
+
+    for index in 0...scan.pageCount - 1 {
+      let image = scan.imageOfPage(at: index)
+
+      if resizeImages {
+        // Get the raw data representation
+        if let pdfData = A4PDFDataFromCentered(image: image, with: Float(padding)) {
+          // Generate a PDF document from the raw data
+          if let pdfDataDocument = PDFDocument(data: pdfData) {
+            // Get the page from the generate document
+            if let pdfPage = pdfDataDocument.page(at: 0) {
+              // Add the generated page to the actual document
+              pdfDocument.insert(pdfPage, at: index)
+            }
+          }
+        }
+      } else {
+        if let pdfPage = PDFPage(image: image) {
+          pdfDocument.insert(pdfPage, at: index)
+        }
+      }
+    }
+
+    return TiBlob(data: pdfDocument.dataRepresentation(), mimetype: "application/pdf")
+  }
+}
+
+// MARK: VNDocumentCameraViewControllerDelegate
+
+extension TiScannerModule: VNDocumentCameraViewControllerDelegate {
+  func documentCameraViewControllerDidCancel(_ controller: VNDocumentCameraViewController) {
+    fireEvent("cancel")
+    dismissAndCleanup()
+  }
+
+  func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFailWithError error: Error) {
+    fireEvent("error", with: ["error": error.localizedDescription])
+    dismissAndCleanup()
+  }
+
+  func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFinishWith scan: VNDocumentCameraScan) {
+    currentScan = scan
+
+    fireEvent("success", with: ["count": scan.pageCount, "title": scan.title])
+    dismissAndCleanup()
+  }
+}
+
+// MARK: Utils to generate a centered image
+
+extension TiScannerModule {
+  func A4PDFDataFromCentered(image: UIImage, with padding: Float) -> Data? {
+    let A4_WIDTH: Float = 595.2
+    let A4_HEIGHT: Float = 841.8
+
+    // Prepare raw data
+    let pdfData = NSMutableData()
+    let pdfConsumer = CGDataConsumer(data: pdfData as CFMutableData)!
+
+    // Calculate the aspect ratio
+    let imageWidth = A4_WIDTH - (padding * 2)
+    let imageHeight = round(CGFloat(imageWidth) * (image.size.height / image.size.width))
+
+    // Calculate the bounces
+    var mediaBox = CGRect(x: 0,
+                          y: 0,
+                          width: CGFloat(A4_WIDTH),
+                          height: CGFloat(A4_HEIGHT)); // A4
+
+    let imageBox = CGRect(x: CGFloat((A4_WIDTH / 2) - (imageWidth / 2)),
+                          y: (CGFloat(A4_HEIGHT) / 2) - (imageHeight / 2),
+                          width: CGFloat(imageWidth),
+                          height: CGFloat(imageHeight))
+
+    // Create the context to draw in
+    let pdfContext = CGContext(consumer: pdfConsumer, mediaBox: &mediaBox, nil)!
+
+    // Perform the drawing
+    pdfContext.beginPage(mediaBox: &mediaBox)
+    pdfContext.draw(image.cgImage!, in: imageBox)
+    pdfContext.endPage()
+    pdfContext.closePDF()
+
+    return pdfData as Data
+  }
+}

Info.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

README.md

@@ -19,7 +19,7 @@ document.
 - [x] `showScanner`
 - [x] `imageOfPageAtIndex(index)` (after the `success` event)
 - [x] `pdfOfPageAtIndex(index)` (after the `success` event)
-- [x] `pdfOfAllPages()` (after the `success` event)
+- [x] `pdfOfAllPages(params)` (after the `success` event - the params include `resizeImages` and `padding` to be used to generate resized A4 PDF's)
 
 ### Events
 

TiScanner_Prefix.pch

@@ -1,5 +1,5 @@
 
 #ifdef __OBJC__
     #import <Foundation/Foundation.h>
-    #import <UIKit/UIKit.h>
 #endif
+