scrollbar_test

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Controls;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.Display;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();            
        }


        double xmin, ymin, xmax, ymax;
        double Xmin, Ymin, Xmax, Ymax;
        int Xvalue = 0;
        int Yvalue = 0;
        int Xlarge = 0;
        int Ylarge = 0;
        double heightFullenv, h, widthFullEnv, w;
        double initScale = 0d;
        int vscrollMaxium = 0;
        int hscrollMaxium = 0;

        IEnvelope pEnvMap = null;
        IMapControl2 pMapControl = null;
        private void axMapControl1_OnExtentUpdated(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnExtentUpdatedEvent e)
        {
            pEnvMap = e.newEnvelope as IEnvelope;
            pMapControl = axMapControl1.Object as IMapControl2;
            if(initScale < 1)
                initScale = pMapControl.MapScale;

            xmin = pEnvMap.XMin;
            ymin = pEnvMap.YMin;
            xmax = pEnvMap.XMax;
            ymax = pEnvMap.YMax;
            w = pEnvMap.Width;
            h = pEnvMap.Height;
            lblLeftBottom.Text = Math.Round(pEnvMap.XMin,2).ToString() + "," + Math.Round(pEnvMap.YMin,2).ToString();
            lblRightTop.Text = Math.Round(pEnvMap.XMax, 2).ToString() + "," + Math.Round(pEnvMap.YMax, 2).ToString();
            lblw.Text = pEnvMap.Width.ToString();


            IEnvelope pEnvFull = pMapControl.ActiveView.FullExtent as IEnvelope;
            Xmin = pEnvFull.XMin;
            Ymin = pEnvFull.YMin;
            Xmax = pEnvFull.XMax;
            Ymax = pEnvFull.YMax;
            widthFullEnv = pEnvFull.Width;
            heightFullenv = pEnvFull.Height;
            lblLeftBottomFull.Text = Math.Round(pEnvFull.XMin, 2).ToString() + "," + Math.Round(pEnvFull.YMin, 2).ToString();
            lblRightTopFull.Text = Math.Round(pEnvFull.XMax, 2).ToString() + "," + Math.Round(pEnvFull.YMax, 2).ToString();
            lblWf.Text = pEnvFull.Width.ToString();


            if (Ymax > ymax && ymin > Ymin)
            {
                vscrollMaxium = (int)(heightFullenv / 100);
                Yvalue = (int)( (Ymax - ymax) / 100);
                Ylarge = (int)(h / 100);
                if (Yvalue + Ylarge > vscrollMaxium)
                {
                    Yvalue = vscrollMaxium - Ylarge;
                }                
            }
            else if (ymax > Ymax)
            {
                vscrollMaxium = (int)((ymax - Ymin) / 100);
                Yvalue = 0;
                Ylarge = (int)(h / 100);
            }
            else if (Ymin > ymin)
            {
                vscrollMaxium = (int)((Ymax - ymin) / 100);
                Ylarge = (int)(h / 100);
                Yvalue = vscrollMaxium - Ylarge + 3;
            }
            this.vScrollBar1.Maximum = vscrollMaxium;
            this.vScrollBar1.LargeChange = Ylarge;
            this.vScrollBar1.Value = Yvalue;
            this.vScrollBar1.SmallChange = (int)(4 * (initScale / pMapControl.MapScale));


            if (Xmax > xmax && xmin > Xmin)
            {
                hscrollMaxium = (int)(widthFullEnv / 100);
                Xvalue = (int)((xmin - Xmin) / 100);
                Xlarge = (int)(w / 100);
                if (Xvalue + Xlarge > hscrollMaxium)
                {
                    Xvalue = hscrollMaxium - Xlarge;
                }
            }
            else if (xmax > Xmax)
            {
                hscrollMaxium = (int)((xmax - Xmin) / 100);
                Xlarge = (int)(w / 100);
                Xvalue = hscrollMaxium - Xlarge + 3;
            }
            else if (Xmin > xmin)
            {
                hscrollMaxium = (int)((Xmax - xmin) / 100);
                Xvalue = 0;
                Xlarge = (int)(w / 100);
            }
            this.hScrollBar1.Maximum = hscrollMaxium;
            this.hScrollBar1.LargeChange = Xlarge;
            this.hScrollBar1.Value = Xvalue;
            this.hScrollBar1.SmallChange = (int)(4 * (initScale / pMapControl.MapScale));



            lblYscroll.Text = "Large:" + Ylarge.ToString() + ",Value:" + Yvalue.ToString() +
                ",Small:" + vScrollBar1.SmallChange.ToString() + ",Max:" + vScrollBar1.Maximum.ToString();
        }


        private void btnSetDemo_Click(object sender, EventArgs e)
        {
            int max = 0;
            int value = 0;
            int smallchange = 0;
            int largechange = 0;
            int.TryParse(this.txtSmallChange.Text, out smallchange);
            int.TryParse(this.txtMaxinum.Text, out max);
            int.TryParse(this.txtValue.Text, out value);
            int.TryParse(txtLargeChange.Text, out largechange);
            this.vScrollBar3.Maximum = max;
            this.vScrollBar3.SmallChange = smallchange;
            this.vScrollBar3.LargeChange = largechange;
            this.vScrollBar3.Value = value;
        }

        private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
        {
            this.axMapControl1.OnExtentUpdated -= this.axMapControl1_OnExtentUpdated;
            double newheight = (e.OldValue - e.NewValue) * 100;
            pEnvMap.Offset(0, newheight);
            this.pMapControl.Extent = pEnvMap;
            this.axMapControl1.OnExtentUpdated += this.axMapControl1_OnExtentUpdated;
        }

        private void hScrollBar1_Scroll(object sender, ScrollEventArgs e)
        {
            this.axMapControl1.OnExtentUpdated -= this.axMapControl1_OnExtentUpdated;
            double w = (e.NewValue - e.OldValue) * 100;
            pEnvMap.Offset(w, 0);
            this.pMapControl.Extent = pEnvMap;
            this.axMapControl1.OnExtentUpdated += this.axMapControl1_OnExtentUpdated;
        }


    }
}