Allow scaling the line height of a RichTextLabel

RELEASE-NOTES.md

@@ -42,6 +42,7 @@ END TEMPLATE-->
 * You can now specify CVar overrides via environment variable with the `ROBUST_CVAR_*` prefix. For example `ROBUST_CVAR_game__hostname=foobar` would set the appropriate CVar. Double underscores in the environment variable name are replaced with ".".
 * Added non-generic variant of `GetCVar` to `IConfigurationManager`.
 * Control layout properties such as `Margin` can now be set via style sheets.
+* Distance between lines of a `RichTextLabel` can now be modified with `LineHeightScale`.
 
 ### Bugfixes
 

Robust.Client/UserInterface/Controls/RichTextLabel.cs

@@ -6,6 +6,7 @@ using Robust.Client.UserInterface.RichText;
 using Robust.Shared.IoC;
 using Robust.Shared.Maths;
 using Robust.Shared.Utility;
+using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.UserInterface.Controls
 {
@@ -16,6 +17,26 @@ namespace Robust.Client.UserInterface.Controls
 
         private FormattedMessage? _message;
         private RichTextEntry _entry;
+        private float _lineHeightScale = 1;
+        private bool _lineHeightOverride;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float LineHeightScale
+        {
+            get
+            {
+                if (!_lineHeightOverride && TryGetStyleProperty(nameof(LineHeightScale), out float value))
+                    return value;
+
+                return _lineHeightScale;
+            }
+            set
+            {
+                _lineHeightScale = value;
+                _lineHeightOverride = true;
+                InvalidateMeasure();
+            }
+        }
 
         public RichTextLabel()
         {
@@ -47,7 +68,7 @@ namespace Robust.Client.UserInterface.Controls
             }
 
             var font = _getFont();
-            _entry.Update(font, availableSize.X * UIScale, UIScale);
+            _entry.Update(font, availableSize.X * UIScale, UIScale, LineHeightScale);
 
             return new Vector2(_entry.Width / UIScale, _entry.Height / UIScale);
         }
@@ -61,7 +82,7 @@ namespace Robust.Client.UserInterface.Controls
                 return;
             }
 
-            _entry.Draw(handle, _getFont(), SizeBox, 0, new MarkupDrawingContext(), UIScale);
+            _entry.Draw(handle, _getFont(), SizeBox, 0, new MarkupDrawingContext(), UIScale, LineHeightScale);
         }
 
         [Pure]

Robust.Client/UserInterface/RichTextEntry.cs

@@ -71,7 +71,8 @@ namespace Robust.Client.UserInterface
         /// <param name="defaultFont">The font being used for display.</param>
         /// <param name="maxSizeX">The maximum horizontal size of the container of this entry.</param>
         /// <param name="uiScale"></param>
-        public void Update(Font defaultFont, float maxSizeX, float uiScale)
+        /// <param name="lineHeightScale"></param>
+        public void Update(Font defaultFont, float maxSizeX, float uiScale, float lineHeightScale = 1)
         {
             // This method is gonna suck due to complexity.
             // Bear with me here.
@@ -159,7 +160,7 @@ namespace Robust.Client.UserInterface
                     if (!context.Font.TryPeek(out var font))
                         font = defaultFont;
 
-                    src.Height += font.GetLineHeight(uiScale);
+                    src.Height += GetLineHeight(font, uiScale, lineHeightScale);
                 }
             }
         }
@@ -170,7 +171,8 @@ namespace Robust.Client.UserInterface
             UIBox2 drawBox,
             float verticalOffset,
             MarkupDrawingContext context,
-            float uiScale)
+            float uiScale,
+            float lineHeightScale = 1)
         {
             context.Clear();
             context.Color.Push(_defaultColor);
@@ -197,7 +199,7 @@ namespace Robust.Client.UserInterface
                     if (lineBreakIndex < LineBreaks.Count &&
                         LineBreaks[lineBreakIndex] == globalBreakCounter)
                     {
-                        baseLine = new Vector2(drawBox.Left, baseLine.Y + font.GetLineHeight(uiScale) + controlYAdvance);
+                        baseLine = new Vector2(drawBox.Left, baseLine.Y + GetLineHeight(font, uiScale, lineHeightScale) + controlYAdvance);
                         controlYAdvance = 0;
                         lineBreakIndex += 1;
                     }
@@ -216,7 +218,7 @@ namespace Robust.Client.UserInterface
                 control.Position = new Vector2(baseLine.X * invertedScale, (baseLine.Y - defaultFont.GetAscent(uiScale)) * invertedScale);
                 control.Measure(new Vector2(Width, Height));
                 var advanceX = control.DesiredPixelSize.X;
-                controlYAdvance = Math.Max(0f, (control.DesiredPixelSize.Y - font.GetLineHeight(uiScale)) * invertedScale);
+                controlYAdvance = Math.Max(0f, (control.DesiredPixelSize.Y - GetLineHeight(font, uiScale, lineHeightScale)) * invertedScale);
                 baseLine += new Vector2(advanceX, 0);
             }
         }
@@ -242,5 +244,11 @@ namespace Robust.Client.UserInterface
             tag.PopDrawContext(node, context);
             return tag.TextAfter(node);
         }
+
+        private static int GetLineHeight(Font font, float uiScale, float lineHeightScale)
+        {
+            var height = font.GetLineHeight(uiScale);
+            return (int)(height * lineHeightScale);
+        }
     }
 }