#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Drawing;
using System.Windows.Forms;

namespace HeuristicLab.Visualization {
  public abstract class ChartMode {
    protected readonly ChartControl chartControl;
    protected Cursor cursor;
    protected Point buttonDownPoint;
    protected Point previousLocation;
    protected int mouseClickCount;

    public abstract Image Image { get; }
    public abstract string Text { get; }

    public virtual string ToolTipText { get { return Text; } }

    public virtual Cursor Cursor {
      get { return cursor ?? (cursor = Cursors.Default); }
    }

    private bool selected;
    public bool Selected {
      get { return selected; }
      set {
        if (selected == value) return;
        selected = value;
        if (selected) {
          chartControl.Mode = this;
          OnSelected();
        } else {
          if (chartControl.Mode == this)
            chartControl.Mode = null;
          OnDeselected();
        }
        OnSelectedChanged();
      }
    }

    protected ChartMode(ChartControl control) {
      chartControl = control;
      chartControl.ModeChanged += (sender, args) => Selected = chartControl.Mode == this;
    }

    public void Select() { Selected = true; }
    public void Deselect() { Selected = false; }

    protected virtual void OnSelected() { }
    protected virtual void OnDeselected() { }

    public virtual void HandleOnKeyDown(object sender, KeyEventArgs e) {
      switch (e.KeyCode) {
        case Keys.Escape:
          Deselect();
          break;
      }
    }

    public virtual void HandleOnKeyUp(object sender, KeyEventArgs e) { }
    public virtual void HandleOnMouseClick(object sender, MouseEventArgs e) { }
    public virtual void HandleOnMouseDoubleClick(object sender, MouseEventArgs e) { }

    public virtual void HandleOnMouseDown(object sender, MouseEventArgs e) {
      buttonDownPoint = e.Location;
      mouseClickCount = e.Clicks;
    }

    public virtual void HandleOnMouseUp(object sender, MouseEventArgs e) { }

    public virtual void HandleOnMouseMove(object sender, MouseEventArgs e) {
      previousLocation = e.Location;
    }

    public virtual void HandleOnMouseWheel(object sender, MouseEventArgs e) { }
    public virtual void HandleOnMouseEnter(object sender, EventArgs e) { }
    public virtual void HandleOnMouseLeave(object sender, EventArgs e) { }
    public virtual void HandleOnClick(object sender, EventArgs e) { }

    public event EventHandler SelectedChanged;
    protected virtual void OnSelectedChanged() {
      var handler = SelectedChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
  }
}