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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; }
}
}
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