v0.1

Subsurface/Source/GUI/GUIScrollBar.cs

@@ -0,0 +1,178 @@
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Subsurface
+{
+    class GUIScrollBar : GUIComponent
+    {
+        public static GUIScrollBar draggingBar;
+
+        private bool isHorizontal;
+
+        private GUIFrame frame;
+        private GUIButton bar;
+        private float barSize;
+        private float barScroll;
+
+        private bool enabled;
+
+        public delegate bool OnMovedHandler(object obj);
+        public OnMovedHandler OnMoved;
+
+        public bool IsHorizontal
+        {
+            get { return isHorizontal; }
+        }
+
+        public bool Enabled
+        {
+            get { return enabled; }
+            set { enabled = value; }
+        }
+
+        public float BarScroll
+        {
+            get { return barScroll; }
+            set
+            {
+                barScroll = MathHelper.Clamp(value, 0.0f, 1.0f);
+                int newX = bar.Rect.X - frame.Rect.X, newY = bar.Rect.Y - frame.Rect.Y;
+                if (isHorizontal)
+                {
+                    newX = (int)(barScroll *(frame.Rect.Width - bar.Rect.Width));
+                    newX = Math.Max(newX, 0);
+                    newX = Math.Min(newX, frame.Rect.Width - bar.Rect.Width);
+
+                }
+                else
+                {
+                    newY = (int)(barScroll * (frame.Rect.Height- bar.Rect.Height));
+                    newY = Math.Max(newY, 0);
+                    newY = Math.Min(newY, frame.Rect.Height - bar.Rect.Height);
+
+                }
+                bar.Rect = new Rectangle(newX + frame.Rect.X, newY + frame.Rect.Y, bar.Rect.Width, bar.Rect.Height);
+            }
+        }
+
+        public float BarSize
+        {
+            get { return barSize; }
+            set 
+            {
+                float oldBarSize = barSize;
+                barSize = Math.Min(Math.Max(value, 0.0f), 1.0f);
+                if (barSize != oldBarSize) UpdateRect();
+            }
+        }
+
+        public GUIScrollBar(Rectangle rect, GUIStyle style, float barSize, GUIComponent parent = null)
+            : this(rect, null, barSize, style, parent)
+        {
+        }
+
+        public GUIScrollBar(Rectangle rect, Color? color, float barSize, GUIStyle style = null, GUIComponent parent = null)
+            : this(rect, color, barSize, Alignment.TopLeft, style, parent)
+        {
+        }
+
+
+        public GUIScrollBar(Rectangle rect, Color? color, float barSize, Alignment alignment, GUIStyle style = null, GUIComponent parent = null)
+            : base(style)
+        {
+            this.rect = rect;
+            //GetDimensions(parent);
+
+            this.alignment = alignment;
+
+            if (parent != null)
+                parent.AddChild(this);
+
+            isHorizontal = (rect.Width > rect.Height);
+            frame = new GUIFrame(new Rectangle(0,0,0,0), Color.White, style, this);
+            //AddChild(frame);
+
+            //System.Diagnostics.Debug.WriteLine(frame.rect);
+
+            bar = new GUIButton(new Rectangle(0, 0, 0, 0), "", color, style, this);
+            
+            bar.OnPressed = SelectBar;
+            //AddChild(bar);
+
+            enabled = true;
+
+            UpdateRect();
+        }
+
+        private void UpdateRect()
+        {
+            
+            bar.Rect = new Rectangle(
+                bar.Rect.X,
+                bar.Rect.Y,
+                isHorizontal ? (int)(frame.Rect.Width * barSize) : frame.Rect.Width,
+                isHorizontal ? frame.Rect.Height : (int)(frame.Rect.Height * barSize));
+
+            foreach (GUIComponent child in bar.children)
+            {
+                child.Rect = bar.Rect;
+            }
+        }
+
+        public override void Update(float deltaTime)
+        {
+            base.Update(deltaTime);
+
+            if (draggingBar != this) return;
+            if (!PlayerInput.LeftButtonDown()) draggingBar = null;
+
+            MoveButton();            
+        }
+
+        public override void Draw(SpriteBatch spriteBatch)
+        {
+            DrawChildren(spriteBatch);
+        }
+
+        private bool SelectBar()
+        {
+            if (!enabled) return false;
+            if (barSize == 1.0f) return false;
+
+            draggingBar = this;
+
+            return true;
+
+        }
+
+        private void MoveButton()
+        {
+            //if (!enabled) return false;
+            //if (barSize == 1.0f) return false;
+
+            int newX = bar.Rect.X - frame.Rect.X, newY = bar.Rect.Y - frame.Rect.Y;
+            int moveAmount;
+            if (isHorizontal)
+            {
+                moveAmount = PlayerInput.GetMouseState.Position.X - PlayerInput.GetOldMouseState.Position.X;
+                newX = Math.Min(Math.Max(newX + moveAmount, 0), frame.Rect.Width - bar.Rect.Width);
+
+                barScroll = (float)newX / ((float)frame.Rect.Width - (float)bar.Rect.Width);
+            }
+            else
+            {
+                moveAmount = PlayerInput.GetMouseState.Position.Y - PlayerInput.GetOldMouseState.Position.Y;
+                newY = Math.Min(Math.Max(newY+moveAmount, 0), frame.Rect.Height - bar.Rect.Height);
+
+                barScroll = (float)newY / ((float)frame.Rect.Height - (float)bar.Rect.Height);
+            }
+
+            if (moveAmount != 0 && OnMoved != null) OnMoved(moveAmount);
+
+            bar.Rect = new Rectangle(newX + frame.Rect.X, newY + frame.Rect.Y, bar.Rect.Width, bar.Rect.Height);
+
+        }
+
+    }
+}