From 8d3afcf276d07e1bac777847259392ca261cdec7 Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Sun, 8 Dec 2019 21:49:15 +0100
Subject: [PATCH] made CanSelectContent be set automatically by the root
 through adding more events

---
 Demos/UiDemo.cs             |  2 +-
 MLEM.Ui/Elements/Element.cs |  4 ++++
 MLEM.Ui/Elements/Tooltip.cs |  2 +-
 MLEM.Ui/UiSystem.cs         | 16 +++++++++++++++-
 4 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/Demos/UiDemo.cs b/Demos/UiDemo.cs
index c60b5c8..0bacbda 100644
--- a/Demos/UiDemo.cs
+++ b/Demos/UiDemo.cs
@@ -140,7 +140,7 @@ namespace Demos {
             root.AddChild(new RadioButton(Anchor.AutoLeft, new Vector2(1, 10), "Radio button 2!") {PositionOffset = new Vector2(0, 1)});
 
             var tooltip = new Tooltip(50, "This is a test tooltip to see the window bounding") {IsHidden = true};
-            this.UiSystem.Add("TestTooltip", tooltip).CanSelectContent = false;
+            this.UiSystem.Add("TestTooltip", tooltip);
             root.AddChild(new VerticalSpace(3));
             root.AddChild(new Button(Anchor.AutoLeft, new Vector2(1, 10), "Toggle Test Tooltip") {
                 OnPressed = element => tooltip.IsHidden = !tooltip.IsHidden
diff --git a/MLEM.Ui/Elements/Element.cs b/MLEM.Ui/Elements/Element.cs
index e14157a..c2be578 100644
--- a/MLEM.Ui/Elements/Element.cs
+++ b/MLEM.Ui/Elements/Element.cs
@@ -163,6 +163,8 @@ namespace MLEM.Ui.Elements {
             element.AndChildren(e => {
                 e.Root = this.Root;
                 e.System = this.System;
+                if (this.Root != null)
+                    this.Root.OnElementAdded(e);
             });
             this.SetSortedChildrenDirty();
             this.SetAreaDirty();
@@ -175,6 +177,8 @@ namespace MLEM.Ui.Elements {
             element.AndChildren(e => {
                 e.Root = null;
                 e.System = null;
+                if (this.Root != null)
+                    this.Root.OnElementRemoved(e);
             });
             this.SetSortedChildrenDirty();
             this.SetAreaDirty();
diff --git a/MLEM.Ui/Elements/Tooltip.cs b/MLEM.Ui/Elements/Tooltip.cs
index f47dcf7..09d8e2d 100644
--- a/MLEM.Ui/Elements/Tooltip.cs
+++ b/MLEM.Ui/Elements/Tooltip.cs
@@ -16,7 +16,7 @@ namespace MLEM.Ui.Elements {
             this.CanBeSelected = false;
 
             if (elementToHover != null) {
-                elementToHover.OnMouseEnter += element => element.System.Add(element.GetType().Name + "Tooltip", this).CanSelectContent = false;
+                elementToHover.OnMouseEnter += element => element.System.Add(element.GetType().Name + "Tooltip", this);
                 elementToHover.OnMouseExit += element => {
                     if (this.System != null)
                         this.System.Remove(element.GetType().Name + "Tooltip");
diff --git a/MLEM.Ui/UiSystem.cs b/MLEM.Ui/UiSystem.cs
index 3412443..67f6ebb 100644
--- a/MLEM.Ui/UiSystem.cs
+++ b/MLEM.Ui/UiSystem.cs
@@ -139,6 +139,7 @@ namespace MLEM.Ui {
             root.Element.AndChildren(e => {
                 e.Root = root;
                 e.System = this;
+                root.OnElementAdded(e);
                 e.SetAreaDirty();
             });
             this.OnRootAdded?.Invoke(root);
@@ -160,6 +161,7 @@ namespace MLEM.Ui {
             root.Element.AndChildren(e => {
                 e.Root = null;
                 e.System = null;
+                root.OnElementRemoved(e);
                 e.SetAreaDirty();
             });
             this.OnRootRemoved?.Invoke(root);
@@ -204,17 +206,29 @@ namespace MLEM.Ui {
             }
         }
         public float ActualScale => this.System.GlobalScale * this.Scale;
-        public bool CanSelectContent = true;
 
         public Matrix Transform = Matrix.Identity;
         public Matrix InvTransform => Matrix.Invert(this.Transform);
 
         public Element SelectedElement { get; private set; }
+        public bool CanSelectContent { get; private set; }
+
+        public Element.GenericCallback OnElementAdded;
+        public Element.GenericCallback OnElementRemoved;
 
         public RootElement(string name, Element element, UiSystem system) {
             this.Name = name;
             this.Element = element;
             this.System = system;
+
+            this.OnElementAdded += e => {
+                if (e.CanBeSelected)
+                    this.CanSelectContent = true;
+            };
+            this.OnElementRemoved += e => {
+                if (e.CanBeSelected && !this.Element.GetChildren(regardGrandchildren: true).Any(c => c.CanBeSelected))
+                    this.CanSelectContent = false;
+            };
         }
 
         public void SelectElement(Element element) {