Added ImageAspectRatio and ImageSize to CarouselTemplate.

Author: Dirk Lemstra

src/LineBot/Messages/Template/CarouselTemplate.cs

@@ -64,5 +64,19 @@ public IEnumerable<ICarouselColumn> Columns
                 _columns = value;
             }
         }
+
+        /// <summary>
+        /// Gets or sets the aspect ratio of the image.
+        /// </summary>
+        [JsonProperty("imageAspectRatio")]
+        [JsonConverter(typeof(EnumConverter<ImageAspectRatio>))]
+        public ImageAspectRatio ImageAspectRatio { get; set; } = ImageAspectRatio.Rectangle;
+
+        /// <summary>
+        /// Gets or sets the size of the image.
+        /// </summary>
+        [JsonProperty("imageSize")]
+        [JsonConverter(typeof(EnumConverter<MessageType>))]
+        public ImageSize ImageSize { get; set; } = ImageSize.Cover;
     }
 }

src/LineBot/Messages/Template/ImageAspectRatio.cs

@@ -0,0 +1,32 @@
+// Copyright 2017 Dirk Lemstra (https://github.com/dlemstra/line-bot-sdk-dotnet)
+//
+// Dirk Lemstra licenses this file to you 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:
+//
+//   https://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.
+
+namespace Line
+{
+    /// <summary>
+    /// Encapsulates the image aspect ratios
+    /// </summary>
+    public enum ImageAspectRatio
+    {
+        /// <summary>
+        /// 1.51:1
+        /// </summary>
+        Rectangle,
+
+        /// <summary>
+        /// 1:1
+        /// </summary>
+        Square,
+    }
+}

src/LineBot/Messages/Template/ImageSize.cs

@@ -0,0 +1,32 @@
+// Copyright 2017 Dirk Lemstra (https://github.com/dlemstra/line-bot-sdk-dotnet)
+//
+// Dirk Lemstra licenses this file to you 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:
+//
+//   https://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.
+
+namespace Line
+{
+    /// <summary>
+    /// Encapsulates the image sizes
+    /// </summary>
+    public enum ImageSize
+    {
+        /// <summary>
+        ///  The image fills the entire image area. Parts of the image that do not fit in the area are not displayed.
+        /// </summary>
+        Cover,
+
+        /// <summary>
+        /// The entire image is displayed in the image area. A background is displayed in the unused areas to the left and right of vertical images and in the areas above and below horizontal images.
+        /// </summary>
+        Contain,
+    }
+}

tests/LineBot.Tests/Messages/Template/CarouselTemplateTests/TheConstructor.cs

@@ -28,7 +28,7 @@ public void ShouldInitializeTheInstance()
                 CarouselTemplate template = new CarouselTemplate();
 
                 string serialized = JsonConvert.SerializeObject(template);
-                Assert.AreEqual(@"{""type"":""carousel"",""columns"":null}", serialized);
+                Assert.AreEqual(@"{""type"":""carousel"",""columns"":null,""imageAspectRatio"":""rectangle"",""imageSize"":""cover""}", serialized);
             }
         }
     }