using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using Netron.Diagramming.Core;

namespace HeuristicLab.Netron {
  [ToolboxItem(true)]
  public partial class NetronVisualization : DiagramControlBase {
    private static Size INVALID_SIZE = new Size(-1,-1);
    private Size oldSize;
    public NetronVisualization()
      : base() {
      InitializeComponent();
      this.oldSize = INVALID_SIZE;

      SetStyle(ControlStyles.AllPaintingInWmPaint, true);
      SetStyle(ControlStyles.DoubleBuffer, true);
      SetStyle(ControlStyles.UserPaint, true);
      SetStyle(ControlStyles.ResizeRedraw, true);

      if (!DesignMode) {
        this.Controller = new Controller(this);
        this.View = new View(this);

        this.Document = new Document();
        this.AttachToDocument(Document);
        this.Controller.View = View;
        TextEditor.Init(this);

        View.OnCursorChange += new EventHandler<CursorEventArgs>(mView_OnCursorChange);
        View.OnBackColorChange += new EventHandler<ColorEventArgs>(View_OnBackColorChange);

        this.SizeChanged += new EventHandler(NetronVisualization_SizeChanged);
        this.AllowDrop = true;
      }
    }

    private void NetronVisualization_SizeChanged(object sender, EventArgs e) {
      if (this.oldSize == INVALID_SIZE) {
        this.View.PageSize = new Size((int)(this.Size.Width * this.Magnification.Width), (int)(this.Size.Height * this.Magnification.Height));
        oldSize = this.Size;
        return;
      }

      SizeF magnificationChanges = new SizeF();
      magnificationChanges.Width = ((float)this.Size.Width) / oldSize.Width;
      magnificationChanges.Height = ((float)this.Size.Height) / oldSize.Height;

      SizeF newMagnification = new SizeF();
      newMagnification.Width = this.View.Magnification.Width * magnificationChanges.Width;
      newMagnification.Height = this.View.Magnification.Height * magnificationChanges.Height;

      this.Magnification = newMagnification;
      this.oldSize = this.Size;
    }

    protected override void OnScroll(ScrollEventArgs se) {
      //base.OnScroll(se);
      if (se.ScrollOrientation == ScrollOrientation.HorizontalScroll) {
        Origin = new Point(se.NewValue, Origin.Y);
        //System.Diagnostics.Trace.WriteLine(se.NewValue);
      } else {
        Origin = new Point(Origin.X, se.NewValue);
        //System.Diagnostics.Trace.WriteLine(se.NewValue);
      }
    }

    private void mView_OnCursorChange(object sender, CursorEventArgs e) {
      this.Cursor = e.Cursor;
    }
  }
}