Sunday, September 27, 2015

How do I scroll 2 listview objects together? 



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using System.Windows.Forms;
 
namespace ListViewSharedScroll
{
    class CustListView : ListView 
    {
        public event ScrollEventHandler Scroll;
        private const int WM_HSCROLL = 0x114;
        private const int WM_VSCROLL = 0x115;
        protected virtual void OnScroll(ScrollEventArgs e)
        {
            ScrollEventHandler handler = this.Scroll;
            if (handler != null) handler(this, e);
        }
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);
            if (m.Msg == WM_VSCROLL)
            { // Trap WM_VSCROLL
                OnScroll(new ScrollEventArgs((ScrollEventType)(m.WParam.ToInt32() & 0xffff), -1, 0, ScrollOrientation.VerticalScroll));
            }
            else if (m.Msg == WM_HSCROLL)
            {
                OnScroll(new ScrollEventArgs((ScrollEventType)(m.WParam.ToInt32() & 0xffff),-1,0,ScrollOrientation.HorizontalScroll));
            }
        }
 
       
       
    }
}



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using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
 
namespace ListViewSharedScroll
{
    
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
 
        int TopItemIndex = 0;
        CustListView ListView1 = new CustListView();
        CustListView ListView2 = new CustListView();
        private void Form1_Load(object sender, EventArgs e)
        {
            
 
            ListView1.Size = new Size(201, 146);
            ListView1.Margin = new Padding(3, 3, 3, 3);
            ListView1.Location = new Point(48, 85);
            ListView1.Scrollable = true;
            ListView1.View = View.Details;
            
            
 
            ListView2.Size = new Size(201, 146);
            ListView2.Margin = new Padding(3, 3, 3, 3);
            ListView2.Location = new Point(280, 85);
            ListView2.Scrollable = true;
            ListView2.View = View.Details;
 
            ListView1.Columns.Add("Header", 100);
            ListView1.Columns.Add("Details", 100);
 
            ListView2.Columns.Add("Header", 100);
            ListView2.Columns.Add("Details", 100);
 

            for (int i = 0; i < 50; i++)
            {
            
                ListView1.Items.Add(new ListViewItem(new string[] { "Alpha"+i.ToString(), "Some details"+i.ToString() }));
                ListView1.Items.Add(new ListViewItem(new string[] { "Bravo" + i.ToString(), "More details" + i.ToString() }));
 
                ListView2.Items.Add(new ListViewItem(new string[] { "Alpha" + i.ToString(), "Some details" + i.ToString() }));
                ListView2.Items.Add(new ListViewItem(new string[] { "Bravo" + i.ToString(), "More details" + i.ToString() }));
            }
 
            
 
            ListView1.Scroll += ListView1_Scroll;
            ListView2.Scroll += ListView1_Scroll;
 
            this.Controls.Add(ListView1);
            this.Controls.Add(ListView2);
 

        }
 
        private void ListView1_Scroll(object sender, ScrollEventArgs e)
        {
 
            if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
            {
                if (TopItemIndex != ListView1.TopItem.Index || TopItemIndex !=  ListView2.TopItem.Index)
                {
                    if (TopItemIndex != ListView1.TopItem.Index)
                    {
                        ListView1.EnsureVisible(ListView1.TopItem.Index);
                        ListView2.EnsureVisible(ListView1.TopItem.Index);
                        TopItemIndex = ListView1.TopItem.Index;
                    }
                    else
                    {
                        ListView1.EnsureVisible(ListView2.TopItem.Index);
                        ListView2.EnsureVisible(ListView2.TopItem.Index);
                        TopItemIndex = ListView2.TopItem.Index;
                    }
 
                    
                }
            }
 
            if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
            {
                ScrollH(1);          
            }
            
        }
 
        private void ScrollH(int pixelsToScroll)
        {
            const Int32 LVM_FIRST = 0x1000;
            const Int32 LVM_SCROLL = LVM_FIRST + 20;
            SendMessage(ListView1.Handle, LVM_SCROLL, (IntPtr)pixelsToScroll, IntPtr.Zero);
            SendMessage(ListView2.Handle, LVM_SCROLL, (IntPtr)pixelsToScroll, IntPtr.Zero);
        }
 

       
    }
}

Refernced articles:
  http://stackoverflow.com/questions/1851620/handling-scroll-event-on-listview-in-c-sharp http://stackoverflow.com/questions/626315/winforms-listview-remembering-scrolled-location-on-reload
http://stackoverflow.com/questions/473148/c-sharp-listview-how-do-i-add-items-to-columns-2-3-and-4-etc
  http://stackoverflow.com/questions/7146567/winforms-listview-not-showing-items-in-detailsview http://stackoverflow.com/questions/372034/how-do-i-listen-for-scrolling-in-a-listview http://stackoverflow.com/questions/372034/how-do-i-listen-for-scrolling-in-a-listview http://bytes.com/topic/c-sharp/answers/255418-scrolling-listview
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