Add Pigeon API, and update Dart to use it

packages/image_picker/image_picker_ios/ios/Classes/messages.g.h

@@ -0,0 +1,54 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Autogenerated from Pigeon (v3.0.1), do not edit directly.
+// See also: https://pub.dev/packages/pigeon
+#import <Foundation/Foundation.h>
+@protocol FlutterBinaryMessenger;
+@protocol FlutterMessageCodec;
+@class FlutterError;
+@class FlutterStandardTypedData;
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NS_ENUM(NSUInteger, FLTSourceCamera) {
+  FLTSourceCameraRear = 0,
+  FLTSourceCameraFront = 1,
+};
+
+typedef NS_ENUM(NSUInteger, FLTSourceType) {
+  FLTSourceTypeCamera = 0,
+  FLTSourceTypeGallery = 1,
+};
+
+@class FLTMaxSize;
+@class FLTSourceSpecification;
+
+@interface FLTMaxSize : NSObject
++ (instancetype)makeWithWidth:(nullable NSNumber *)width
+    height:(nullable NSNumber *)height;
+@property(nonatomic, strong, nullable) NSNumber * width;
+@property(nonatomic, strong, nullable) NSNumber * height;
+@end
+
+@interface FLTSourceSpecification : NSObject
+/// `init` unavailable to enforce nonnull fields, see the `make` class method.
+- (instancetype)init NS_UNAVAILABLE;
++ (instancetype)makeWithType:(FLTSourceType)type
+    camera:(FLTSourceCamera)camera;
+@property(nonatomic, assign) FLTSourceType type;
+@property(nonatomic, assign) FLTSourceCamera camera;
+@end
+
+/// The codec used by FLTImagePickerApi.
+NSObject<FlutterMessageCodec> *FLTImagePickerApiGetCodec(void);
+
+@protocol FLTImagePickerApi
+- (void)pickImageWithSource:(FLTSourceSpecification *)source maxSize:(FLTMaxSize *)maxSize quality:(nullable NSNumber *)imageQuality completion:(void(^)(NSString *_Nullable, FlutterError *_Nullable))completion;
+- (void)pickMultiImageWithMaxSize:(FLTMaxSize *)maxSize quality:(nullable NSNumber *)imageQuality completion:(void(^)(NSArray<NSString *> *_Nullable, FlutterError *_Nullable))completion;
+- (void)pickVideoWithSource:(FLTSourceSpecification *)source maxDuration:(nullable NSNumber *)maxDurationSeconds completion:(void(^)(NSString *_Nullable, FlutterError *_Nullable))completion;
+@end
+
+extern void FLTImagePickerApiSetup(id<FlutterBinaryMessenger> binaryMessenger, NSObject<FLTImagePickerApi> *_Nullable api);
+
+NS_ASSUME_NONNULL_END

packages/image_picker/image_picker_ios/ios/Classes/messages.g.m

@@ -0,0 +1,209 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Autogenerated from Pigeon (v3.0.1), do not edit directly.
+// See also: https://pub.dev/packages/pigeon
+#import "messages.g.h"
+#import <Flutter/Flutter.h>
+
+#if !__has_feature(objc_arc)
+#error File requires ARC to be enabled.
+#endif
+
+static NSDictionary<NSString *, id> *wrapResult(id result, FlutterError *error) {
+  NSDictionary *errorDict = (NSDictionary *)[NSNull null];
+  if (error) {
+    errorDict = @{
+        @"code": (error.code ? error.code : [NSNull null]),
+        @"message": (error.message ? error.message : [NSNull null]),
+        @"details": (error.details ? error.details : [NSNull null]),
+        };
+  }
+  return @{
+      @"result": (result ? result : [NSNull null]),
+      @"error": errorDict,
+      };
+}
+static id GetNullableObject(NSDictionary* dict, id key) {
+  id result = dict[key];
+  return (result == [NSNull null]) ? nil : result;
+}
+static id GetNullableObjectAtIndex(NSArray* array, NSInteger key) {
+  id result = array[key];
+  return (result == [NSNull null]) ? nil : result;
+}
+
+
+@interface FLTMaxSize ()
++ (FLTMaxSize *)fromMap:(NSDictionary *)dict;
+- (NSDictionary *)toMap;
+@end
+@interface FLTSourceSpecification ()
++ (FLTSourceSpecification *)fromMap:(NSDictionary *)dict;
+- (NSDictionary *)toMap;
+@end
+
+@implementation FLTMaxSize
++ (instancetype)makeWithWidth:(nullable NSNumber *)width
+    height:(nullable NSNumber *)height {
+  FLTMaxSize* pigeonResult = [[FLTMaxSize alloc] init];
+  pigeonResult.width = width;
+  pigeonResult.height = height;
+  return pigeonResult;
+}
++ (FLTMaxSize *)fromMap:(NSDictionary *)dict {
+  FLTMaxSize *pigeonResult = [[FLTMaxSize alloc] init];
+  pigeonResult.width = GetNullableObject(dict, @"width");
+  pigeonResult.height = GetNullableObject(dict, @"height");
+  return pigeonResult;
+}
+- (NSDictionary *)toMap {
+  return [NSDictionary dictionaryWithObjectsAndKeys:(self.width ? self.width : [NSNull null]), @"width", (self.height ? self.height : [NSNull null]), @"height", nil];
+}
+@end
+
+@implementation FLTSourceSpecification
++ (instancetype)makeWithType:(FLTSourceType)type
+    camera:(FLTSourceCamera)camera {
+  FLTSourceSpecification* pigeonResult = [[FLTSourceSpecification alloc] init];
+  pigeonResult.type = type;
+  pigeonResult.camera = camera;
+  return pigeonResult;
+}
++ (FLTSourceSpecification *)fromMap:(NSDictionary *)dict {
+  FLTSourceSpecification *pigeonResult = [[FLTSourceSpecification alloc] init];
+  pigeonResult.type = [GetNullableObject(dict, @"type") integerValue];
+  pigeonResult.camera = [GetNullableObject(dict, @"camera") integerValue];
+  return pigeonResult;
+}
+- (NSDictionary *)toMap {
+  return [NSDictionary dictionaryWithObjectsAndKeys:@(self.type), @"type", @(self.camera), @"camera", nil];
+}
+@end
+
+@interface FLTImagePickerApiCodecReader : FlutterStandardReader
+@end
+@implementation FLTImagePickerApiCodecReader
+- (nullable id)readValueOfType:(UInt8)type 
+{
+  switch (type) {
+    case 128:     
+      return [FLTMaxSize fromMap:[self readValue]];
+
+    case 129:     
+      return [FLTSourceSpecification fromMap:[self readValue]];
+
+    default:    
+      return [super readValueOfType:type];
+
+  }
+}
+@end
+
+@interface FLTImagePickerApiCodecWriter : FlutterStandardWriter
+@end
+@implementation FLTImagePickerApiCodecWriter
+- (void)writeValue:(id)value 
+{
+  if ([value isKindOfClass:[FLTMaxSize class]]) {
+    [self writeByte:128];
+    [self writeValue:[value toMap]];
+  } else 
+  if ([value isKindOfClass:[FLTSourceSpecification class]]) {
+    [self writeByte:129];
+    [self writeValue:[value toMap]];
+  } else 
+{
+    [super writeValue:value];
+  }
+}
+@end
+
+@interface FLTImagePickerApiCodecReaderWriter : FlutterStandardReaderWriter
+@end
+@implementation FLTImagePickerApiCodecReaderWriter
+- (FlutterStandardWriter *)writerWithData:(NSMutableData *)data {
+  return [[FLTImagePickerApiCodecWriter alloc] initWithData:data];
+}
+- (FlutterStandardReader *)readerWithData:(NSData *)data {
+  return [[FLTImagePickerApiCodecReader alloc] initWithData:data];
+}
+@end
+
+NSObject<FlutterMessageCodec> *FLTImagePickerApiGetCodec() {
+  static dispatch_once_t sPred = 0;
+  static FlutterStandardMessageCodec *sSharedObject = nil;
+  dispatch_once(&sPred, ^{
+    FLTImagePickerApiCodecReaderWriter *readerWriter = [[FLTImagePickerApiCodecReaderWriter alloc] init];
+    sSharedObject = [FlutterStandardMessageCodec codecWithReaderWriter:readerWriter];
+  });
+  return sSharedObject;
+}
+
+
+void FLTImagePickerApiSetup(id<FlutterBinaryMessenger> binaryMessenger, NSObject<FLTImagePickerApi> *api) {
+  {
+    FlutterBasicMessageChannel *channel =
+      [[FlutterBasicMessageChannel alloc]
+        initWithName:@"dev.flutter.pigeon.ImagePickerApi.pickImage"
+        binaryMessenger:binaryMessenger
+        codec:FLTImagePickerApiGetCodec()        ];
+    if (api) {
+      NSCAssert([api respondsToSelector:@selector(pickImageWithSource:maxSize:quality:completion:)], @"FLTImagePickerApi api (%@) doesn't respond to @selector(pickImageWithSource:maxSize:quality:completion:)", api);
+      [channel setMessageHandler:^(id _Nullable message, FlutterReply callback) {
+        NSArray *args = message;
+        FLTSourceSpecification *arg_source = GetNullableObjectAtIndex(args, 0);
+        FLTMaxSize *arg_maxSize = GetNullableObjectAtIndex(args, 1);
+        NSNumber *arg_imageQuality = GetNullableObjectAtIndex(args, 2);
+        [api pickImageWithSource:arg_source maxSize:arg_maxSize quality:arg_imageQuality completion:^(NSString *_Nullable output, FlutterError *_Nullable error) {
+          callback(wrapResult(output, error));
+        }];
+      }];
+    }
+    else {
+      [channel setMessageHandler:nil];
+    }
+  }
+  {
+    FlutterBasicMessageChannel *channel =
+      [[FlutterBasicMessageChannel alloc]
+        initWithName:@"dev.flutter.pigeon.ImagePickerApi.pickMultiImage"
+        binaryMessenger:binaryMessenger
+        codec:FLTImagePickerApiGetCodec()        ];
+    if (api) {
+      NSCAssert([api respondsToSelector:@selector(pickMultiImageWithMaxSize:quality:completion:)], @"FLTImagePickerApi api (%@) doesn't respond to @selector(pickMultiImageWithMaxSize:quality:completion:)", api);
+      [channel setMessageHandler:^(id _Nullable message, FlutterReply callback) {
+        NSArray *args = message;
+        FLTMaxSize *arg_maxSize = GetNullableObjectAtIndex(args, 0);
+        NSNumber *arg_imageQuality = GetNullableObjectAtIndex(args, 1);
+        [api pickMultiImageWithMaxSize:arg_maxSize quality:arg_imageQuality completion:^(NSArray<NSString *> *_Nullable output, FlutterError *_Nullable error) {
+          callback(wrapResult(output, error));
+        }];
+      }];
+    }
+    else {
+      [channel setMessageHandler:nil];
+    }
+  }
+  {
+    FlutterBasicMessageChannel *channel =
+      [[FlutterBasicMessageChannel alloc]
+        initWithName:@"dev.flutter.pigeon.ImagePickerApi.pickVideo"
+        binaryMessenger:binaryMessenger
+        codec:FLTImagePickerApiGetCodec()        ];
+    if (api) {
+      NSCAssert([api respondsToSelector:@selector(pickVideoWithSource:maxDuration:completion:)], @"FLTImagePickerApi api (%@) doesn't respond to @selector(pickVideoWithSource:maxDuration:completion:)", api);
+      [channel setMessageHandler:^(id _Nullable message, FlutterReply callback) {
+        NSArray *args = message;
+        FLTSourceSpecification *arg_source = GetNullableObjectAtIndex(args, 0);
+        NSNumber *arg_maxDurationSeconds = GetNullableObjectAtIndex(args, 1);
+        [api pickVideoWithSource:arg_source maxDuration:arg_maxDurationSeconds completion:^(NSString *_Nullable output, FlutterError *_Nullable error) {
+          callback(wrapResult(output, error));
+        }];
+      }];
+    }
+    else {
+      [channel setMessageHandler:nil];
+    }
+  }
+}