From f56b7fbeff91494629d64ffb6d91a388d914aeb8 Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Tue, 13 Aug 2019 16:02:29 +0200
Subject: [PATCH] made scroll bar clickable

---
 MLEM.Ui/Elements/Element.cs   |  2 +-
 MLEM.Ui/Elements/ScrollBar.cs | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/MLEM.Ui/Elements/Element.cs b/MLEM.Ui/Elements/Element.cs
index 2b83e55..c5ab6ef 100644
--- a/MLEM.Ui/Elements/Element.cs
+++ b/MLEM.Ui/Elements/Element.cs
@@ -93,7 +93,7 @@ namespace MLEM.Ui.Elements {
         protected InputHandler Input => this.System.InputHandler;
         public RootElement Root { get; private set; }
         public float Scale => this.Root.ActualScale;
-        public Vector2 MousePos => this.Input.MousePosition.ToVector2();
+        public Point MousePos => this.Input.MousePosition;
         public Element Parent { get; private set; }
         public bool IsMouseOver { get; private set; }
         public bool IsSelected { get; private set; }
diff --git a/MLEM.Ui/Elements/ScrollBar.cs b/MLEM.Ui/Elements/ScrollBar.cs
index 3463c07..e805341 100644
--- a/MLEM.Ui/Elements/ScrollBar.cs
+++ b/MLEM.Ui/Elements/ScrollBar.cs
@@ -2,6 +2,7 @@ using System;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 using MLEM.Extensions;
+using MLEM.Input;
 using MLEM.Textures;
 using MLEM.Ui.Style;
 
@@ -35,6 +36,7 @@ namespace MLEM.Ui.Elements {
         }
         public float StepPerScroll = 1;
         public ValueChanged OnValueChanged;
+        private bool isMouseHeld;
 
         public ScrollBar(Anchor anchor, Vector2 size, int scrollerHeight, float maxValue) : base(anchor, size) {
             this.maxValue = maxValue;
@@ -44,6 +46,17 @@ namespace MLEM.Ui.Elements {
         public override void Update(GameTime time) {
             base.Update(time);
             var moused = this.System.MousedElement;
+            if (moused == this && this.Input.IsMouseButtonDown(MouseButton.Left)) {
+                this.isMouseHeld = true;
+            } else if (this.isMouseHeld && this.Input.IsMouseButtonUp(MouseButton.Left)) {
+                this.isMouseHeld = false;
+            }
+            
+            if (this.isMouseHeld) {
+                var internalY = this.MousePos.Y - this.Area.Y;
+                this.CurrentValue = internalY / (float) this.Area.Height * this.MaxValue;
+            }
+            
             if (moused == this.Parent || moused?.Parent == this.Parent) {
                 var scroll = this.Input.LastScrollWheel - this.Input.ScrollWheel;
                 if (scroll != 0)