[smuxi: 151/179] Engine: implement ImageMessagePartModel.Equals()

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit 22f94c5083e69373a4ed6591ab0ece61b2990616
Author: Mirco Bauer <meebey meebey net>
Date:   Wed May 31 23:30:04 2017 +0800

    Engine: implement ImageMessagePartModel.Equals()

 src/Engine-Tests/MessageModelTests.cs        |    9 ++++++
 src/Engine/Messages/ImageMessagePartModel.cs |   35 ++++++++++++++++++++-----
 2 files changed, 37 insertions(+), 7 deletions(-)
---
diff --git a/src/Engine-Tests/MessageModelTests.cs b/src/Engine-Tests/MessageModelTests.cs
index 96760c1..5cd5283 100644
--- a/src/Engine-Tests/MessageModelTests.cs
+++ b/src/Engine-Tests/MessageModelTests.cs
@@ -63,6 +63,15 @@ namespace Smuxi.Engine
             var textPart = (TextMessagePartModel) msg.MessageParts[0];
             textPart.ForegroundColor = TextColor.Grey;
             Assert.IsFalse(msg.Equals(SimpleMessage));
+
+            var actualMsg = new MessageModel();
+            actualMsg.MessageParts.Add(new ImageMessagePartModel("filename", "text"));
+            var expectedMsg = new MessageModel();
+            expectedMsg.MessageParts.Add(new ImageMessagePartModel("filename", "text"));
+            Assert.IsTrue(expectedMsg.Equals(actualMsg));
+            var imagePart = (ImageMessagePartModel) actualMsg.MessageParts[0];
+            imagePart.AlternativeText = "foo";
+            Assert.IsFalse(expectedMsg.Equals(actualMsg));
         }
 
         [Test]
diff --git a/src/Engine/Messages/ImageMessagePartModel.cs b/src/Engine/Messages/ImageMessagePartModel.cs
index d6ea51a..dec9abc 100644
--- a/src/Engine/Messages/ImageMessagePartModel.cs
+++ b/src/Engine/Messages/ImageMessagePartModel.cs
@@ -1,13 +1,7 @@
 /*
- * $Id: Config.cs 100 2005-08-07 14:54:22Z meebey $
- * $URL: svn+ssh://svn.qnetp.net/svn/smuxi/smuxi/trunk/src/Engine/Config.cs $
- * $Rev: 100 $
- * $Author: meebey $
- * $Date: 2005-08-07 16:54:22 +0200 (Sun, 07 Aug 2005) $
- *
  * Smuxi - Smart MUltipleXed Irc
  *
- * Copyright (c) 2005-2006 Mirco Bauer <meebey meebey net>
+ * Copyright (c) 2008, 2012, 2017 Mirco Bauer <meebey meebey net>
  *
  * Full GPL License: <http://www.gnu.org/licenses/gpl.txt>
  *
@@ -113,5 +107,32 @@ namespace Smuxi.Engine
             sw.Write( f_ImageFileName);
             sw.Write( f_AlternativeText);
         }
+
+        public override bool Equals(object obj)
+        {
+            if (!(obj is ImageMessagePartModel)) {
+                return false;
+            }
+
+            var textPart = (ImageMessagePartModel) obj;
+            return Equals(textPart);
+        }
+
+        public override bool Equals(MessagePartModel part)
+        {
+            var imagePart = part as ImageMessagePartModel;
+            if ((object) imagePart == null) {
+                return false;
+            }
+
+            if (f_ImageFileName != imagePart.ImageFileName) {
+                return false;
+            }
+            if (f_AlternativeText != imagePart.AlternativeText) {
+                return false;
+            }
+
+            return base.Equals(imagePart);
+        }
     }
 }