Microsoft VSrollBar behavior or bug with touch screen - windows forms

Question

I found a strange behavior with VScrollBar (vertical scrollbar available in Visual Studio tool box). The problem is \"if I swipe down on the scrollbar, it moves up.

Answer 1

I think what you want is a ViewPort.

Essentially you put a Control inside a PictureBox. The Control has a larger height than the PictureBox making it a ViewPort.

Before

You'll need to change the form designer code to get the control inside the PictureBox:

'
'PictureBox1
'
Me.PictureBox1.Location = New System.Drawing.Point(96, 87)
Me.PictureBox1.Name = "PictureBox1"
Me.PictureBox1.Size = New System.Drawing.Size(231, 195)
Me.PictureBox1.TabIndex = 0
Me.PictureBox1.TabStop = False
'
'VScrollBar1
'
Me.VScrollBar1.Location = New System.Drawing.Point(330, 88)
Me.VScrollBar1.Name = "VScrollBar1"
Me.VScrollBar1.Size = New System.Drawing.Size(34, 194)
Me.VScrollBar1.TabIndex = 2
'
'TextBox1
'
Me.TextBox1.Location = New System.Drawing.Point(0, 0)
Me.TextBox1.Multiline = True
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(211, 251)
Me.TextBox1.TabIndex = 3
'
'Form1
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(522, 392)
Me.Controls.Add(Me.VScrollBar1)
Me.Controls.Add(Me.PictureBox1)
'======= THIS IS THE CRITICAL CHANGE ======= 
PictureBox1.Controls.Add(Me.TextBox1)

After

Then manually place a ScrollBar to the right of the PictureBox and facilitate the behaviour yourself, eg:

//set the VScroll the difference
VScroll.Max = Textbox.Height - PictureBox.Height;

In the VScroll event:

TextBox.Top = -VScroll.Value;

This will save you from mucking around with system settings in order to produce a QuickViewer custom control.

You can add smarts to it like programming PictureBox drag events to set the ScrollBar (and subsequently the inside controls Top). For most inside controls you'll just need to work out the Height which is easy using a for loop, eg:

foreach(var ctrl in PictureBox.Controls) { 
// tally up the controls height
...

For inside Textbox controls you can work out the Height based on Fontsize and number of lines. There are plenty of examples online showing how to do that. Since you're doing Textbox's with graphics, eg e.Graphics.DrawString it should be easy enough having the inside control as a innerPictureBox.

To swap the scroll/swipe direction set the VScroll default starting Value to its Max value and set the inside controls Top = VScroll.Value (no minus sign needed)

Answer 2

I want the scrollbar to move down while swiping down and move up while swiping up.

As per Hans Passants comment its just a system setting (in the form of a registry key):

The answer is actually over at SuperUser:

https://superuser.com/questions/310681/inverting-direction-of-mouse-scroll-wheel

In C# as you wanted:

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 Microsoft.Win32;
using System.Diagnostics;
using System.Security.Principal;

namespace WindowsFormsApplication1 {

    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }
        private Flippable[] flippable;
        private void Form1_Load(object sender, EventArgs e) {
            WindowsPrincipal pricipal = new WindowsPrincipal(WindowsIdentity.GetCurrent());
            bool hasAdministrativeRight = pricipal.IsInRole(WindowsBuiltInRole.Administrator);

            if (!hasAdministrativeRight) {
                RunElevated(Application.ExecutablePath);
                this.Close();
                Application.Exit();
            }

            //probably only want to flip mice.
            flippable = getFlippable("hid.mousedevice");
            dgv_flippable.DataSource = flippable;
            foreach (var col in dgv_flippable.Columns.OfType<DataGridViewCheckBoxColumn>()) {
                col.TrueValue = true;
                col.FalseValue = false;
                col.IndeterminateValue = null;
            }
        }
        private static bool RunElevated(string fileName)
        {
            //MessageBox.Show("Run: " + fileName);
            ProcessStartInfo processInfo = new ProcessStartInfo();
            processInfo.UseShellExecute = true;
            processInfo.Verb = "runas";
            processInfo.FileName = fileName;
            try
            {
                Process.Start(processInfo);
                return true;
            }
            catch (Win32Exception)
            {
                //Do nothing. Probably the user canceled the UAC window
            }
            return false;
        }

        private Flippable[] getFlippable(string filter) {
            List<Flippable> flips = new List<Flippable>();
            using (RegistryKey hid = Registry.LocalMachine.OpenSubKey(@"SYSTEM\CurrentControlSet\Enum\HID\",false)) {
                foreach (string devicekn in hid.GetSubKeyNames()) {
                    using (RegistryKey device = hid.OpenSubKey(devicekn,false)) {
                        foreach (string devicekn2 in device.GetSubKeyNames()) {
                            using (RegistryKey device2 = device.OpenSubKey(devicekn2,false)) {
                                using (RegistryKey devparam = device2.OpenSubKey("Device Parameters",true)) {
                                    if (devparam != null) {
                                        flips.Add(new Flippable(new string[] { devicekn, devicekn2 }, device2, devparam, tmr_popup));
                                    }
                                }
                            }
                        }
                    }
                }
            }
            if (filter != null) {
                return flips.Where(f=>f.name.Contains(filter)).ToArray();
            }
            return flips.ToArray();
        }

        private void dgv_flippable_MouseUp(object sender, MouseEventArgs e) {
            dgv_flippable.EndEdit();
        }

        private void button1_Click(object sender, EventArgs e) {
            flippable = getFlippable(null);
            dgv_flippable.DataSource = flippable;
        }

        private void btn_flip_Click(object sender, EventArgs e) {
            foreach (var f in flippable) {
                f.vertical = true;
                f.horizontal = true;
            }
            dgv_flippable.DataSource = null;
            dgv_flippable.DataSource = flippable;
        }

        private void btn_normal_Click(object sender, EventArgs e) {
            foreach (var f in flippable) {
                f.vertical = false;
                f.horizontal = false;
            }
            dgv_flippable.DataSource = null;
            dgv_flippable.DataSource = flippable;
        }

        private void tmr_popup_Tick(object sender, EventArgs e) {
            tmr_popup.Enabled = false;
            notifyIcon1.ShowBalloonTip(99999999);
        }
    }

    public class Flippable {
        public Flippable(string[] keyPath, RegistryKey deviceKey, RegistryKey devparam, Timer timer) {
            this._keyPath = keyPath;
            IEnumerable<bool?> flipValues = Flippable.valueNames
                .Select(v => onlyIntBool(devparam.GetValue(v, null)));
            this.name = (string)deviceKey.GetValue("DeviceDesc");
            this._vertical = flipValues.ElementAt(0);
            this._horizontal = flipValues.ElementAt(1);
            this._timer = timer;
        }
        private bool? onlyIntBool(object value) {
            try {
                return value == null ? null : (bool?)(((int)value) != 0);
            } catch {
                return null;
            }
        }
        public static string[] valueNames = new string[] { "FlipFlopWheel", "FlipFlopHScroll" };

        public string name { get; private set; }
        private string[] _keyPath;
        private bool? _vertical;
        private bool? _horizontal;
        Timer _timer;
        public bool? vertical { set { flip(Flippable.valueNames[0], value); _vertical = value; } get { return _vertical; } }
        public bool? horizontal { set { flip(Flippable.valueNames[1], value); _horizontal = value; } get { return _horizontal; } }

        public void flip(string valueName, bool? value) {
            using (RegistryKey hid = Registry.LocalMachine.OpenSubKey(@"SYSTEM\CurrentControlSet\Enum\HID\", false)) {
                using (RegistryKey device = hid.OpenSubKey(_keyPath[0], false)) {
                    using (RegistryKey device2 = device.OpenSubKey(_keyPath[1], false)) {
                        using (RegistryKey devparam = device2.OpenSubKey("Device Parameters", true)) {
                            if (value == null) {
                                devparam.DeleteValue(valueName);
                            } else {
                                devparam.SetValue(valueName, value == true ? 1 : 0);
                                _timer.Enabled = true;
                            }
                        }
                    }
                }
            }
        }

    }
}

REF: https://github.com/jamie-pate/flipflop-windows-wheel/blob/master/Form1.cs

_{Disclaimer: normally this question would get closed as a duplicate but because there is a bounty on it and the duplicate is over at SuperUser I've chosen to share that answer here. Full credit to the original author: https://superuser.com/users/108033/richard and https://superuser.com/users/132069/jamie-pate}