Add StyleBox.GetEnvelopBox.

SS14.Client/Graphics/Drawing/StyleBox.cs

@@ -234,6 +234,24 @@ namespace SS14.Client.Graphics.Drawing
             return new UIBox2(left, top, right, bottom);
         }
 
+        /// <summary>
+        ///     Gets the draw box, positioned at <paramref name="position"/>,
+        ///     that envelops a box with the given dimensions perfectly given this box's content margins.
+        /// </summary>
+        /// <remarks>
+        ///     It's basically a reverse <see cref="GetContentBox"/>.
+        /// </remarks>
+        /// <param name="position">The position at which the new box should be drawn.</param>
+        /// <param name="dimensions">The dimensions of the content box inside this new box.</param>
+        /// <returns>
+        ///     A box that, when ran through <see cref="GetContentBox"/>,
+        ///     has a content box of size <paramref name="dimensions"/>
+        /// </returns>
+        public UIBox2 GetEnvelopBox(Vector2 position, Vector2 dimensions)
+        {
+            return UIBox2.FromDimensions(position, dimensions + MinimumSize);
+        }
+
         public void SetContentMarginOverride(Margin margin, float value)
         {
             if ((margin & Margin.Left) != 0)

SS14.UnitTesting/Client/Graphics/StyleBoxTest.cs

@@ -25,7 +25,11 @@ namespace SS14.UnitTesting.Client.Graphics
 
             Assert.That(
                 styleBox.GetEnvelopBox(Vector2.Zero, new Vector2(50, 50)),
-                Is.EqualTo(new UIBox2(3, 5, 60, 66)));
+                Is.EqualTo(new UIBox2(0, 0, 60, 66)));
+
+            Assert.That(
+                styleBox.GetEnvelopBox(new Vector2(10, 10), new Vector2(50, 50)),
+                Is.EqualTo(new UIBox2(10, 10, 70, 76)));
         }
     }
 }

SS14.UnitTesting/SS14.UnitTesting.csproj

@@ -105,6 +105,7 @@
     <Compile Include="ApproxEqualityConstraint.cs" />
     <Compile Include="Client\GameObjects\Components\Transform_Test.cs" />
     <Compile Include="Client\GameControllerProxyDummy.cs" />
+    <Compile Include="Client\Graphics\StyleBoxTest.cs" />
     <Compile Include="Client\Graphics\TextureLoadParametersTest.cs" />
     <Compile Include="Client\UserInterface\ControlTest.cs" />
     <Compile Include="Client\UserInterface\StylesheetTest.cs" />