Hand tool to move view around

GoDiagram (6 and previous)
1

We would like to implement a Hand tool that is similar to Acrobat
Reader (or google maps); for example, you manually grab a location in
the top right corner and drag the view toward the center.

GoToolPanning with AutoPan = false has the opposite behaviour of what
we are trying to do. Can someone suggest a workaround?

2

I got the desired effect by creating my own PanningTool. I included the code for your consumption

using System.Drawing;
using System.Windows.Forms;
using Northwoods.Go;

namespace DemandDS.App.MVCA.FCDiagramMVCA.Diagram
{
///


/// The PanningTool behaves like Acrobat Reader or
Google Maps. It allows the user to “grab” a location of
/// the view and move it around.
///
public class PanningTool: GoTool
{

    // Initial location on the first mouse down.
    private PointF Origin = new PointF(0,0);

    private Cursor panDefault;
    private Cursor panGrab;

    /// <summary>
    /// Constructor
    /// </summary>
    /// <param name="view"></param>
    public PanningTool(GoView view) : base(view)
    {
        panDefault = AppResourceManager.GetCursor("PanDefault.png");
        panGrab = AppResourceManager.GetCursor("PanGrab.png");
    }

    public override void Start()
    {
        base.Start ();
    }

    public override void Stop()
    {
        base.Stop ();
    }

    /// <summary>
    /// On mouse down, grab the location and change the cursor the hand grab icon.
    /// </summary>
    public override void DoMouseDown()
    {
        Origin = new

PointF(LastInput.MouseEventArgs.X, LastInput.MouseEventArgs.Y);
View.Cursor = panGrab;
base.DoMouseDown ();
}

    /// <summary>
    /// Reposition the view as the user moves the mouse.
    /// </summary>
    public override void DoMouseMove()
    {
        if (LastInput.MouseEventArgs.Button == MouseButtons.Left)
        {

//
(_ProView.FindMouseTool(typeof(GoToolRubberBanding))
as GoToolRubberBanding).Stop();

PointF offset = new

PointF(LastInput.MouseEventArgs.X - Origin.X,
LastInput.MouseEventArgs.Y - Origin.Y);

View.DocPosition = new PointF(View.DocPosition.X -

offset.X, View.DocPosition.Y - offset.Y);

Origin = new  PointF(LastInput.MouseEventArgs.X,

LastInput.MouseEventArgs .Y);
}

        base.DoMouseMove ();
    }

    /// <summary>
    /// Restores cursor on mouse up ready for the next grab and drag.
    /// </summary>
    public override void DoMouseUp()
    {
        View.Cursor = panDefault;
        base.DoMouseUp ();
    }

}// PanningTool

}

3

Thanks for the code, but I don’t understand why GoToolPanning with AutoPan == false doesn’t give you behavior like Google Maps or Acrobat Reader? It does when I try it:
// modal manual panning: (left mouse button)
GoToolPanning panningtool = new GoToolPanning(myView);
panningtool.AutoPan = false;
panningtool.Modal = true;
myView.Tool = panningtool;