source: stable/HeuristicLab.ExtLibs/HeuristicLab.Netron/3.0.2672.12446/Netron.Diagramming.Core-3.0.2672.12446/Tools/AbstractDrawingTool.cs @ 16462

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

namespace Netron.Diagramming.Core {
  /// <summary>
  /// The base class for a drawing tool.
  /// </summary>
  public abstract class AbstractDrawingTool :
      AbstractTool,
      IMouseListener,
      IKeyboardListener {

    #region Fields

    // ------------------------------------------------------------------
    /// <summary>
    /// The starting point of the rectangle being drawn.
    /// </summary>
    // ------------------------------------------------------------------
    protected Point startingPoint;

    // ------------------------------------------------------------------
    /// <summary>
    /// Says whether the startingPoint was set, otherwise the ghost will 
    /// appear even before an initial point was set!
    /// </summary>
    // ------------------------------------------------------------------
    protected bool started;

    // ------------------------------------------------------------------
    /// <summary>
    /// The actual rectangle which serves as a basis for the drawing of 
    /// ellipses, rectangles, etc.
    /// </summary>
    // ------------------------------------------------------------------
    private RectangleF mRectangle;


    #endregion

    #region Properties
    protected RectangleF Rectangle {
      get { return mRectangle; }
      set { mRectangle = value; }
    }



    #endregion

    #region Constructor
    /// <summary>
    /// Default constructor
    /// </summary>
    /// <param name="name"></param>
    protected AbstractDrawingTool(string name)
      : base(name) {
    }
    #endregion

    #region Methods

    protected override void OnActivateTool() {

      Controller.View.CurrentCursor = CursorPalette.Add;

    }

    protected override void OnDeactivateTool() {

      base.OnDeactivateTool();
    }

    #region Explicit implementation of IKeyboardListener
    void IKeyboardListener.KeyDown(KeyEventArgs e) {
      OnKeyDown(e);
    }

    void IKeyboardListener.KeyUp(KeyEventArgs e) {
      OnKeyUp(e);
    }

    void IKeyboardListener.KeyPress(KeyPressEventArgs e) {
      OnKeyPress(e);
    }

    protected virtual void OnKeyDown(KeyEventArgs e) {
      //if (e.Handled) return;

      if (e.KeyData == Keys.Escape) {
        DeactivateTool();
        Controller.View.ResetGhost();
        e.Handled = true;
      }
    }
    protected virtual void OnKeyUp(KeyEventArgs e) {
      if (e.Handled) return;
    }

    protected virtual void OnKeyPress(KeyPressEventArgs e) {
      if (e.Handled) return;
    }
    #endregion

    #region Explicit implementation of IMouseListener
    bool IMouseListener.MouseDown(MouseEventArgs e) {
      return OnMouseDown(e);
    }

    void IMouseListener.MouseMove(MouseEventArgs e) {
      OnMouseMove(e);
    }

    void IMouseListener.MouseUp(MouseEventArgs e) {
      OnMouseUp(e);
    }


    protected virtual bool OnMouseDown(MouseEventArgs e) {
      if (IsActive && e.Button == MouseButtons.Left) {
        startingPoint = new Point(e.X, e.Y);
        started = true;
        return true;
      }
      return false;
    }

    protected virtual void OnMouseMove(MouseEventArgs e) {

    }

    protected virtual void OnMouseUp(MouseEventArgs e) {
      if ((IsActive) &&
          (started) &&
          (Controller.View.Ghost != null)) {

        //base.RestoreCursor();
        Point point = new Point(e.X, e.Y);
        //mRectangle = new Rectangle(startingPoint.X, startingPoint.Y, point.X - startingPoint.X, point.Y - startingPoint.Y);
        //mRectangle = base.Controller.View.ViewToWorld(base.Controller.View.DeviceToView(rectangle));
        mRectangle = Controller.View.Ghost.Rectangle;
        GhostDrawingComplete();
        Controller.View.ResetGhost();
        started = false;
      }
    }
    #endregion

    /// <summary>
    /// This method will be called when the user has finished drawing a 
    /// ghost rectangle or bundle and initiates the actual creation of a 
    /// bundle and the addition to the model via the appropriate command.
    /// </summary>
    protected abstract void GhostDrawingComplete();

    #endregion




  }

}