Databases
StackOverflow2013
Postsdbo
POHorizontal scroll using mouse wheel ( C# & WinAPI )
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHorizontal scroll using mouse wheel ( C# & WinAPI )
    primarykey
    data
    text
    <p>I am creating a logic to scrolling the control under mouse position without focus (outlook style) in my form. I am able to achieve this behavior using IMessageFilter. However I am facing difficulty to apply a Horizontal scroll, if "SHIFT" key is pressed. </p> <pre><code>using System; using System.ComponentModel; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; using System.Drawing; public partial class UI : Form { MouseWheelMessageFilter mouseFilter = null; public UI() { InitializeComponent(); mouseFilter = new MouseWheelMessageFilter(); Application.AddMessageFilter(mouseFilter); this.FormClosed += (o, e) =&gt; Application.RemoveMessageFilter(mouseFilter); } } public class MouseWheelMessageFilter : IMessageFilter { [DllImport("user32.dll")] public static extern IntPtr WindowFromPoint(Point pt); [DllImport("user32.dll")] public static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp); public const int MK_CONTROL = 0x0008; public const int MK_SHIFT = 0x0004; public const int WM_MOUSEWHEEL = 0x020A; public const int WM_MOUSEHWHEEL = 0x020E; public bool PreFilterMessage(ref Message m) { if (m.Msg == WM_MOUSEWHEEL) { var shiftKeyDown = (char)((Keys)m.WParam) == MK_SHIFT; //apply the scroll to the control at mouse location Point pos = new Point(m.LParam.ToInt32() &amp; 0xffff, m.LParam.ToInt32() &gt;&gt; 16); IntPtr hWnd = WindowFromPoint(pos); if (hWnd != IntPtr.Zero &amp;&amp; hWnd != m.HWnd &amp;&amp; Control.FromHandle(hWnd) != null) { if (shiftKeyDown) //TODO: Horizontal scroll - Not working WM_MOUSEHWHEEL (0x020E) //SendMessage(hWnd, WM_MOUSEHWHEEL, m.WParam, m.LParam); else //Vertical Scroll - working SendMessage(hWnd, WM_MOUSEWHEEL, m.WParam, m.LParam); return true; } } return false; } } </code></pre> <p>What should I need to do in the //TODO section to get horizontal scroll working?</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USRiju
    1. USRiju
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COA *lot* of applications don't support WM_MOUSEHWHEEL. In a project I worked on, we had to write code to find scrollbars and programmatically manipulate them (which has a host of its own issues).
      singulars
      1. POHorizontal scroll using mouse wheel ( C# & WinAPI )
      1. USEric Brown
    2. COCouple more notes: It's better to use `PostMessage` when sending messages to windows you don't own rather than `SendMessage`. If you *must* send messages (instead of posting), use `SendMessageTimeout`.
      singulars
      1. POHorizontal scroll using mouse wheel ( C# & WinAPI )
      1. USEric Brown
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload