Move printing library files

@@ -14,48 +14,15 @@
  * limitations under the License.
  */
 
+library printing;
+
 import 'dart:async';
 import 'dart:typed_data';
-import 'dart:ui';
+import 'dart:ui' as ui;
 
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:pdf/pdf.dart';
 
-class Printing {
-  static const MethodChannel _channel = MethodChannel('printing');
-
-  static Future<Null> printPdf({PdfDocument document, List<int> bytes}) async {
-    assert(document != null || bytes != null);
-    assert(!(document == null && bytes == null));
-
-    if (document != null) bytes = document.save();
-
-    final Map<String, dynamic> params = <String, dynamic>{
-      'doc': Uint8List.fromList(bytes),
-    };
-
-    await _channel.invokeMethod('printPdf', params);
-  }
-
-  static Future<Null> sharePdf(
-      {PdfDocument document, List<int> bytes, Rect bounds}) async {
-    assert(document != null || bytes != null);
-    assert(!(document == null && bytes == null));
-
-    if (document != null) bytes = document.save();
-
-    if (bounds == null) {
-      bounds = Rect.fromCircle(center: Offset.zero, radius: 10.0);
-    }
-
-    final Map<String, dynamic> params = <String, dynamic>{
-      'doc': Uint8List.fromList(bytes),
-      'x': bounds.left,
-      'y': bounds.top,
-      'w': bounds.width,
-      'h': bounds.height,
-    };
-    await _channel.invokeMethod('sharePdf', params);
-  }
-}
+part 'src/asset_utils.dart';
+part 'src/printing.dart';

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+part of printing;
+
+Future<PdfImage> pdfImageFromImage(
+    {@required PdfDocument pdf, @required ui.Image image}) async {
+  var bytes = await image.toByteData(format: ui.ImageByteFormat.rawRgba);
+
+  return PdfImage(pdf,
+      image: bytes.buffer.asUint8List(),
+      width: image.width,
+      height: image.height);
+}
+
+Future<PdfImage> pdfImageFromImageProvider(
+    {@required PdfDocument pdf,
+    @required ImageProvider image,
+    ImageConfiguration configuration,
+    ImageErrorListener onError}) async {
+  final Completer<PdfImage> completer = Completer<PdfImage>();
+  final ImageStream stream =
+      image.resolve(configuration ?? ImageConfiguration.empty);
+
+  void listener(ImageInfo image, bool sync) async {
+    final result = await pdfImageFromImage(pdf: pdf, image: image.image);
+    if (!completer.isCompleted) completer.complete(result);
+    stream.removeListener(listener);
+  }
+
+  void errorListener(dynamic exception, StackTrace stackTrace) {
+    if (!completer.isCompleted) completer.complete(null);
+    if (onError != null) {
+      onError(exception, stackTrace);
+    } else {
+      FlutterError.reportError(FlutterErrorDetails(
+        context: 'image failed to load',
+        library: 'printing',
+        exception: exception,
+        stack: stackTrace,
+        silent: true,
+      ));
+    }
+  }
+
+  stream.addListener(listener, onError: errorListener);
+  return completer.future;
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+part of printing;
+
+class Printing {
+  static const MethodChannel _channel = MethodChannel('printing');
+
+  static Future<Null> printPdf({PdfDocument document, List<int> bytes}) async {
+    assert(document != null || bytes != null);
+    assert(!(document == null && bytes == null));
+
+    if (document != null) bytes = document.save();
+
+    final Map<String, dynamic> params = <String, dynamic>{
+      'doc': Uint8List.fromList(bytes),
+    };
+
+    await _channel.invokeMethod('printPdf', params);
+  }
+
+  static Future<Null> sharePdf(
+      {PdfDocument document, List<int> bytes, Rect bounds}) async {
+    assert(document != null || bytes != null);
+    assert(!(document == null && bytes == null));
+
+    if (document != null) bytes = document.save();
+
+    if (bounds == null) {
+      bounds = Rect.fromCircle(center: Offset.zero, radius: 10.0);
+    }
+
+    final Map<String, dynamic> params = <String, dynamic>{
+      'doc': Uint8List.fromList(bytes),
+      'x': bounds.left,
+      'y': bounds.top,
+      'w': bounds.width,
+      'h': bounds.height,
+    };
+    await _channel.invokeMethod('sharePdf', params);
+  }
+}