From 1ee492ccd4870208088221e2182047c06d28855c Mon Sep 17 00:00:00 2001
From: "H. Utku Maden" <utkumaden@hotmail.com>
Date: Wed, 17 Jul 2024 23:12:07 +0300
Subject: [PATCH] Push WIP changes before rename.

---
 .../Quik.Media.Defaults.csproj                |  2 +-
 Quik/Controls/Control.cs                      | 15 ++++
 Quik/Controls/FlowBox.cs                      | 79 ++++++++++++++++++-
 3 files changed, 94 insertions(+), 2 deletions(-)

diff --git a/Quik.Media.Defaults/Quik.Media.Defaults.csproj b/Quik.Media.Defaults/Quik.Media.Defaults.csproj
index a829d98..3704286 100644
--- a/Quik.Media.Defaults/Quik.Media.Defaults.csproj
+++ b/Quik.Media.Defaults/Quik.Media.Defaults.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="ReFuel.FreeType" Version="0.1.0-rc.3" />
+    <PackageReference Include="ReFuel.FreeType" Version="0.1.0-rc.4" />
     <PackageReference Include="ReFuel.StbImage" Version="2.0.0-rc.3" />
   </ItemGroup>
 
diff --git a/Quik/Controls/Control.cs b/Quik/Controls/Control.cs
index 7df96dd..8ddd65c 100644
--- a/Quik/Controls/Control.cs
+++ b/Quik/Controls/Control.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using Quik.CommandMachine;
 
 namespace Quik.Controls
@@ -106,5 +107,19 @@ namespace Quik.Controls
         {
             LayoutValidated?.Invoke(sender, ea);
         }
+
+        protected void ValidateChildrenLayout()
+        {
+            if (this is IEnumerable<Control> enumerable)
+            {
+                foreach (Control child in enumerable)
+                {
+                    if (child.IsLayoutValid)
+                        continue;
+                    
+                    child.ValidateLayout();
+                }
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/Quik/Controls/FlowBox.cs b/Quik/Controls/FlowBox.cs
index a73f802..b3a0adc 100644
--- a/Quik/Controls/FlowBox.cs
+++ b/Quik/Controls/FlowBox.cs
@@ -1,4 +1,7 @@
 using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
 using Quik.CommandMachine;
 
 namespace Quik.Controls
@@ -9,15 +12,89 @@ namespace Quik.Controls
         public bool AllowWrap { get; set; }
         public VerticalAlignment VerticalAlignment { get; set; }
         public HorizontalAlignment HorizontalAlignment { get; set; }
+        public float ItemPadding { get; set; } = 4f;
 
         protected override void ValidateLayout()
         {
-            throw new NotImplementedException();
+            ValidateChildrenLayout();
         }
 
         protected override void ValidateVisual(CommandList cmd)
         {
             throw new NotImplementedException();
         }
+
+        private void FlowHorizontal()
+        {
+            IEnumerator<Control> controls = this.GetEnumerator();
+            List<Control> row;
+        }
+
+        // Enumerate a row.
+        private bool EnumerateRows(IEnumerator<Control> iterator, List<Control> row)
+        {
+            float width = 0;
+
+            do
+            {
+                if (width + iterator.Current.Size.X < Size.X)
+                {
+                    row.Add(iterator.Current);
+                    width += iterator.Current.Size.X + ItemPadding;
+                }
+                else
+                {
+                    return true;
+                }
+            } while (iterator.MoveNext());
+
+            return false;
+        }
+
+        // Flows a row of children.
+        private void FlowRow(List<Control> line, QVec2 offset, QVec2 size, float packedWidth)
+        {
+            QVec2 pointer = offset;
+            
+            pointer.X += hstart();
+
+            foreach (Control child in line)
+            {
+                child.Position = pointer;
+                pointer += new QVec2(child.Size.X + hoffset(child), voffset(child));
+            }
+
+            float hstart()
+            {
+                return HorizontalAlignment switch {
+                    HorizontalAlignment.Center => (size.Y - packedWidth) / 2,
+                    HorizontalAlignment.Right => size.Y - packedWidth,
+                    _ => 0f
+                };
+            }
+
+            float hoffset(Control child)
+            {
+                if (line.Count == 1)
+                    return 0;
+                else if (HorizontalAlignment == HorizontalAlignment.Justify)
+                {
+                    return ItemPadding + ((size.Y - packedWidth) / (line.Count - 1));
+                }
+                else
+                {
+                    return ItemPadding;
+                }
+            }
+
+            float voffset(Control child)
+            {
+                return VerticalAlignment switch {
+                    VerticalAlignment.Top => 0f,
+                    VerticalAlignment.Bottom => size.Y - child.Size.Y,
+                    _ => (size.Y - child.Size.Y) / 2,
+                };
+            }
+        }
     }
 }
\ No newline at end of file