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Source/Editor/CustomEditors/GUI/CheckablePropertyNameLabel.cs

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+using System;
+using FlaxEngine;
+using FlaxEngine.Assertions;
+using FlaxEngine.GUI;
+
+namespace FlaxEditor.CustomEditors.GUI
+{
+    /// <summary>
+    /// Custom property name label that contains a checkbox used to enable/disable a property.
+    /// </summary>
+    /// <seealso cref="FlaxEditor.CustomEditors.GUI.PropertyNameLabel" />
+    [HideInEditor]
+    public class CheckablePropertyNameLabel : PropertyNameLabel
+    {
+        /// <summary>
+        /// The check box.
+        /// </summary>
+        public readonly CheckBox CheckBox;
+
+        /// <summary>
+        /// Event fired when 'checked' state gets changed.
+        /// </summary>
+        public event Action<CheckablePropertyNameLabel> CheckChanged;
+
+        /// <inheritdoc />
+        public CheckablePropertyNameLabel(string name)
+        : base(name)
+        {
+            CheckBox = new CheckBox(2, 2)
+            {
+                Checked = true,
+                Size = new Vector2(14),
+                Parent = this
+            };
+            CheckBox.StateChanged += OnCheckChanged;
+            Margin = new Margin(CheckBox.Right + 4, 0, 0, 0);
+        }
+
+        private void OnCheckChanged(CheckBox box)
+        {
+            CheckChanged?.Invoke(this);
+            UpdateStyle();
+        }
+
+        /// <summary>
+        /// Updates the label style.
+        /// </summary>
+        public virtual void UpdateStyle()
+        {
+            var style = Style.Current;
+            bool check = CheckBox.Checked;
+
+            // Update label text color
+            TextColor = check ? style.Foreground : style.ForegroundGrey;
+
+            // Update child controls enabled state
+            if (FirstChildControlIndex >= 0 && Parent is PropertiesList propertiesList)
+            {
+                var controls = propertiesList.Children;
+                var labels = propertiesList.Element.Labels;
+                var thisIndex = labels.IndexOf(this);
+                Assert.AreNotEqual(-1, thisIndex, "Invalid label linkage.");
+                int childControlsCount = 0;
+                if (thisIndex + 1 < labels.Count)
+                    childControlsCount = labels[thisIndex + 1].FirstChildControlIndex - FirstChildControlIndex - 1;
+                else
+                    childControlsCount = controls.Count;
+                int lastControl = Mathf.Min(FirstChildControlIndex + childControlsCount, controls.Count);
+                for (int i = FirstChildControlIndex; i < lastControl; i++)
+                {
+                    controls[i].Enabled = check;
+                }
+            }
+        }
+
+        /// <inheritdoc />
+        protected override void PerformLayoutBeforeChildren()
+        {
+            base.PerformLayoutBeforeChildren();
+
+            // Center checkbox
+            CheckBox.Y = (Height - CheckBox.Height) / 2;
+        }
+    }
+}