source: trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.Netron/3.0.2672.12446/Netron.Diagramming.Core-3.0.2672.12446/Tools/DragDropTool.cs @ 4068

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

namespace Netron.Diagramming.Core {
  // ----------------------------------------------------------------------
  /// <summary>
  /// This tool implements the action of moving shapes on the canvas. 
  /// <para>Note that this tool is slightly different than other tools 
  /// since it activates itself unless it has been suspended by another 
  /// tool. </para>
  /// </summary>
  public class DragDropTool :
      AbstractTool,
      IMouseListener,
      IDragDropListener {

    #region Fields
    Cursor feedbackCursor;
    #endregion

    #region Constructor
    /// <summary>
    /// Initializes a new instance of the <see cref="T:DragDropTool"/> class.
    /// </summary>
    /// <param name="name">The name of the tool.</param>
    public DragDropTool(string name)
      : base(name) {
    }
    #endregion

    #region Methods

    /// <summary>
    /// Called when the tool is activated.
    /// </summary>
    protected override void OnActivateTool() {
      Controller.View.CurrentCursor = Cursors.SizeAll;
    }

    /// <summary>
    /// Handles the mouse down event
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    public bool MouseDown(MouseEventArgs e) {
      return false; //continue spreading the events
    }

    /// <summary>
    /// Handles the mouse move event
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    public void MouseMove(MouseEventArgs e) {

    }
    /// <summary>
    /// Handles the mouse up event
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    public void MouseUp(MouseEventArgs e) {

    }
    #endregion

    /// <summary>
    /// On dragdrop.
    /// </summary>
    /// <param name="e">The <see cref="T:KeyEventArgs"/> instance containing the event data.</param>
    public bool OnDragDrop(DragEventArgs e) {
      Control control = (Control)this.Controller.ParentControl;
      Point p = control.PointToClient(new Point(e.X, e.Y));
      IShape shape = null;
      IDataObject iDataObject = e.Data;
      string text;

      if (iDataObject.GetDataPresent("IShape")) {
        shape = (IShape)iDataObject.GetData("IShape");
        shape.Model = Controller.Model;
      } else if (iDataObject.GetDataPresent(typeof(string))) {
        text = iDataObject.GetData(
                typeof(string)).ToString();

        //foreach (string shapeType in Enum.GetNames(typeof(ShapeTypes)))
        //{
        //    if (shapeType.ToString().ToLower() == text.ToLower())
        //    {
        //        shape = ShapeFactory.GetShape(shapeType);
        //        break;
        //    }
        //}

        // If our shape is still null, then the text being dragged
        // onto the canvas is not the name of a shape, so add a
        // TextOnly shape with the text.
        //if (shape == null)
        //{
        //    shape = new TextOnly(Controller.Model);
        //    (shape as TextOnly).Text = text;
        //}

        shape = new TextOnly(Controller.Model);
        (shape as TextOnly).Text = text;
      } else if (iDataObject.GetDataPresent(DataFormats.FileDrop)) {
        try {
          string[] files = (string[])iDataObject.GetData(
              DataFormats.FileDrop);

          foreach (string fileName in files) {
            FileInfo info = new FileInfo(fileName);

            if (info.Exists) {
              FileShape fileShape = new FileShape(fileName);
              AddShapeCommand cmd = new AddShapeCommand(
                  this.Controller,
                  fileShape,
                  p);
              this.Controller.UndoManager.AddUndoCommand(cmd);
              cmd.Redo();
              p.Offset(20, 20);
            }
          }

          feedbackCursor = null;
        }
        catch {
        }
      } else if (iDataObject.GetDataPresent(typeof(Bitmap))) {
        // Doesn't support dropping images yet - having problems
        // getting images off the clipboard.
        shape = new ImageShape(Controller.Model);
        (shape as ImageShape).Image =
            (Image)iDataObject.GetData(typeof(Bitmap));
        return true;
      }

      if (shape != null) {
        shape.MoveBy(new Point(p.X, p.Y));


        //ComplexRectangle shape = new ComplexRectangle();
        //shape.Rectangle = new Rectangle(p.X, p.Y, 150, 70);
        //shape.Text = "Just an example, work in progress.";

        //TextLabel shape = new TextLabel();
        //shape.Rectangle = new Rectangle(p.X, p.Y, 150, 70);
        //shape.Text = "Just an example, work in progress.";

        AddShapeCommand cmd = new AddShapeCommand(
            this.Controller,
            shape,
            p);
        this.Controller.UndoManager.AddUndoCommand(cmd);
        cmd.Redo();
        feedbackCursor = null;
        return true;
      }

      // The drop event wasn't handled here.
      return false;
    }

    /// <summary>
    /// On drag leave.
    /// </summary>
    /// <param name="e">The <see cref="T:KeyEventArgs"/> instance containing the event data.</param>
    public bool OnDragLeave(EventArgs e) {
      return false;
    }

    /// <summary>
    /// On drag over.
    /// </summary>
    /// <param name="e">The <see cref="T:KeyPressEventArgs"/> instance containing the event data.</param>
    public bool OnDragOver(DragEventArgs e) {
      return AnalyzeData(e);
    }


    /// <summary>
    /// On drag enter
    /// </summary>
    /// <param name="e"></param>
    public bool OnDragEnter(DragEventArgs e) {
      return AnalyzeData(e);
    }

    private bool AnalyzeData(DragEventArgs e) {
      IDataObject iDataObject = e.Data;

      if (iDataObject.GetDataPresent("IShape")) {
        feedbackCursor = CursorPalette.DropShape;
        e.Effect = DragDropEffects.Copy;
        return true;
      }

      if (iDataObject.GetDataPresent(typeof(string))) {
        // Need to determine if the text on the clipboard is the
        // name of a shape or if it's just plain old text to add.
        //foreach(string shapeType in Enum.GetNames(typeof(ShapeTypes)))
        //{
        //    if(shapeType.ToString().ToLower() == 
        //        iDataObject.GetData(
        //        typeof(string)).ToString().ToLower())
        //    {
        //        feedbackCursor = CursorPalette.DropShape;
        //        e.Effect = DragDropEffects.Copy;
        //        return true;
        //    }
        //}
        feedbackCursor = CursorPalette.DropText;
        e.Effect = DragDropEffects.Copy;
        return true;
      }

      if (iDataObject.GetDataPresent(DataFormats.FileDrop)) {
        feedbackCursor = CursorPalette.Add;
        e.Effect = DragDropEffects.Copy;
        return true;
      }

      // Having problems getting images off the clipboard.
      //if(iDataObject.GetDataPresent(typeof(Bitmap)))
      //{
      //    feedbackCursor = CursorPallet.DropImage;
      //    e.Effect = DragDropEffects.Copy;
      //    return;

      //}
      return false;
    }


    public void GiveFeedback(GiveFeedbackEventArgs e) {
      e.UseDefaultCursors = false;
      Cursor.Current = feedbackCursor;
    }
  }

}