1 files changed, 271 insertions, 0 deletions
diff --git a/ShiftOS.Frontend/GUI/Control.cs b/ShiftOS.Frontend/GUI/Control.cs
new file mode 100644
index 0000000..975c69a
--- /dev/null
+++ b/ShiftOS.Frontend/GUI/Control.cs
@@ -0,0 +1,271 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+
+namespace ShiftOS.Frontend.GUI
+{
+    public abstract class Control
+    {
+        private int _x = 0;
+        private int _y = 0;
+        private int _w = 0;
+        private int _h = 0;
+        private Control _parent = null;
+        private List<Control> _children = new List<Control>();
+        private bool _wasMouseInControl = false;
+        private bool _leftState = false;
+        private bool _rightState = false;
+        private bool _middleState = false;
+        private bool _visible = true;
+
+        public bool Visible
+        {
+            get
+            {
+                return _visible;
+            }
+            set
+            {
+                _visible = value;
+            }
+        }
+
+        public void AddControl(Control ctrl)
+        {
+            if (!_children.Contains(ctrl))
+            {
+                ctrl._parent = this;
+                _children.Add(ctrl);
+            }
+        }
+
+        public bool MouseLeftDown
+        {
+            get
+            {
+                return _leftState;
+            }
+        }
+
+        public bool MouseMiddleDown
+        {
+            get
+            {
+                return _middleState;
+            }
+        }
+
+        public bool MouseRightDown
+        {
+            get
+            {
+                return _rightState;
+            }
+        }
+
+
+
+        public int X
+        {
+            get
+            {
+                return _x;
+            }
+            set
+            {
+                _x = value;
+            }
+        }
+
+        public int Y
+        {
+            get
+            {
+                return _y;
+            }
+            set
+            {
+                _y = value;
+            }
+        }
+
+        public int Width
+        {
+            get
+            {
+                return _w;
+            }
+            set
+            {
+                _w = value;
+            }
+        }
+
+        public int Height
+        {
+            get
+            {
+                return _h;
+            }
+            set
+            {
+                _h = value;
+            }
+        }
+
+        public Control Parent
+        {
+            get
+            {
+                return _parent;
+            }
+        }
+
+        public Control[] Children
+        {
+            get
+            {
+                return _children.ToArray();
+            }
+        }
+
+        public Point PointToParent(int x, int y)
+        {
+            return new Point(x + _x, y + _y);
+        }
+
+        public Point PointToScreen(int x, int y)
+        {
+            var parentCoords = PointToParent(x, y);
+            Control parent = this._parent;
+            while(parent != null)
+            {
+                parentCoords = parent.PointToParent(parentCoords.X, parentCoords.Y);
+                parent = parent.Parent;
+            }
+            return parentCoords;
+        }
+
+        public Point PointToLocal(int x, int y)
+        {
+            return new GUI.Point(x - _x, y - _y);
+        }
+
+        public virtual void MouseStateChanged() { }
+
+        public virtual void Paint(System.Drawing.Graphics gfx)
+        {
+            if (_visible == true)
+            {
+                if (_children.Count > 0)
+                {
+                    foreach (var child in _children)
+                    {
+                        using (var cBmp = new System.Drawing.Bitmap(child.Width, child.Height))
+                        {
+                            child.Paint(System.Drawing.Graphics.FromImage(cBmp));
+                            gfx.DrawImage(cBmp, new System.Drawing.Point(child.X, child.Y));
+                        }
+                    }
+                }
+            }
+        }
+
+        public virtual bool ProcessMouseState(MouseState state)
+        {
+            //If we aren't rendering the control, we aren't accepting input.
+            if (_visible == false)
+                return false;
+
+
+            //Firstly, we get the mouse coordinates in the local space
+            var coords = PointToLocal(state.Position.X, state.Position.Y);
+            //Now we check if the mouse is within the bounds of the control
+            if(coords.X > 0 && coords.Y > 0 && coords.X <= _w && coords.Y <= _h)
+            {
+                //We're in the local space. Let's fire the MouseMove event.
+                MouseMove?.Invoke(coords);
+                //Also, if the mouse hasn't been in the local space last time it moved, fire MouseEnter.
+                if(_wasMouseInControl == false)
+                {
+                    _wasMouseInControl = true;
+                    MouseEnter?.Invoke();
+                }
+
+                //Things are going to get a bit complicated.
+                //Firstly, we need to find out if we have any children.
+                bool _requiresMoreWork = true;
+                if(_children.Count > 0)
+                {
+                    //We do. We're going to iterate through them all and process the mouse state.
+                    foreach(var control in _children)
+                    {
+
+                        //If the process method returns true, then we do not need to do anything else on our end.
+
+                        //We need to first create a new mousestate object with the new coordinates
+
+                        var nstate = new MouseState(coords.X, coords.Y, state.ScrollWheelValue, state.LeftButton, state.MiddleButton, state.RightButton, state.XButton1, state.XButton2);
+                        //pass that state to the process method, and set the _requiresMoreWork value to the opposite of the return value
+                        _requiresMoreWork = !control.ProcessMouseState(nstate);
+                        //If it's false, break the loop.
+                        if (_requiresMoreWork == false)
+                            break;
+                    }
+                }
+
+                //If we need to do more work...
+                if(_requiresMoreWork == true)
+                {
+                    bool fire = false; //so we know to fire a MouseStateChanged method
+                    //Let's get the state values of each button
+                    bool ld = state.LeftButton == ButtonState.Pressed;
+                    bool md = state.MiddleButton == ButtonState.Pressed;
+                    bool rd = state.RightButton == ButtonState.Pressed;
+                    if(ld != _leftState || md != _middleState || rd != _rightState)
+                    {
+                        fire = true;
+                    }
+                    _leftState = ld;
+                    _middleState = md;
+                    _rightState = rd;
+                    if (fire)
+                        MouseStateChanged();
+                }
+                return true;
+            }
+            else
+            {
+                //If the mouse was in local space before, fire MouseLeave
+                if(_wasMouseInControl == true)
+                {
+                    _wasMouseInControl = false;
+                    MouseLeave?.Invoke();
+                }
+            }
+            //Mouse is not in the local space, don't do anything.
+            return false;
+        }
+
+        public event Action<Point> MouseMove;
+        public event Action MouseEnter;
+        public event Action MouseLeave;
+    }
+
+    public struct Point
+    {
+        public Point(int x, int y)
+        {
+            X = x;
+            Y = y;
+        }
+
+        public int X { get; set; }
+        public int Y { get; set; }
+    }
+
+}