C# Click and drag or use mouse scroll (Postmessage/Sendmessage)

Question

I’m creating a console application, I need to scroll a certain part of the window from positions (x=350 y=240) to (x=350 y=120) (vertical scrolling), tried in several ways but could not. I also could not use the WM_MOUSEWHEEEL option. Follow the code I use for clicks that work perfectly, I just need to adapt it to click and drag or determine a Y point of the window and use mouse scrolling. Please, could you help me?

public class Win32
{
    // The WM_COMMAND message is sent when the user selects a command item from 
    // a menu, when a control sends a notification message to its parent window, 
    // or when an accelerator keystroke is translated.
    public const int WM_KEYDOWN = 0x100;
    public const int WM_KEYUP = 0x101;
    public const int WM_COMMAND = 0x111;
    public const int WM_LBUTTONDOWN = 0x201;
    public const int WM_LBUTTONUP = 0x202;
    public const int WM_LBUTTONDBLCLK = 0x203;
    public const int WM_RBUTTONDOWN = 0x204;
    public const int WM_RBUTTONUP = 0x205;
    public const int WM_RBUTTONDBLCLK = 0x206;

    [DllImport("User32.dll")]
    public static extern Int32 PostMessage(int hWnd, int Msg, int wParam, IntPtr lParam);

}

static void Main(string[] args)
{
    IntPtr WinHandle = User32.FindWindow(null, "My Window");

    Win32.PostMessage((int)WinHandle, Win32.WM_LBUTTONDOWN, 0x00000001, CreateLParam(350, 240));
    Thread.Sleep(100);
    /Win32.PostMessage((int)WinHandle, Win32.WM_LBUTTONUP, 0x00000000, CreateLParam(350, 120));
    Console.Write("Done");
    Console.ReadKey();
}

Answer 1

I don’t quite understand the problem, but if what you need is something in which specific areas of your console need to have idenpenedente scroll, then maybe you have a project that can help you

This creates some components that can be used in projects whose proposal is to create an application-console: https://github.com/goblinfactory/konsole

And for independent scroll creation it uses buffer so it can emulate scroll behavior.

public void MoveBufferArea(int sourceLeft, int sourceTop, int sourceWidth, int sourceHeight, int targetLeft, int targetTop)
{
    int xOffset = targetLeft - sourceLeft;
    int yOffset = targetTop - sourceTop;

    var direction = GetDirection(xOffset, yOffset);

    switch (direction)
    {
        case Direction.Down:
            ScrollDown(-yOffset, sourceLeft, sourceTop, sourceWidth, sourceHeight);
            break;
        default:
            throw new NotSupportedException("No other direction other than scrolling Down is currently supported. Please wait for next major release.");
    }
}