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 EN_HSCROLL

The EN_HSCROLL notification message is sent when the user clicks an edit control's horizontal scroll bar. The parent window of the edit control receives this notification message through a WM_COMMAND message. The parent window is notified before the screen is updated.

    LRESULT CALLBACK WindowProc(
      HWND hwnd,       // handle to window
      UINT uMsg,       // WM_COMMAND
      WPARAM wParam,   // edit control identifier, EN_HSCROLL
      LPARAM lParam    // handle to edit control (HWND)
    );

Parameters

• wParam
  The low-order word specifies the edit control identifier. The high-order word specifies the notification message.
• lParam
  Handle to the edit control.

Remarks

This message is sent for the following mouse events on the horizontal scroll bar: clicking either arrow button or clicking between the arrow button and the thumb. However, the message is not sent when clicking the scroll bar thumb itself. The message is also sent when a keyboard event causes a change in the view area of the edit control, for example, pressing HOME, END, LEFT ARROW, or RIGHT ARROW.

Rich Edit: To receive EN_HSCROLL notifications, specify ENM_SCROLL in the mask sent with the EM_SETEVENTMASK message. For information about the compatibility of rich edit versions with the various system versions, see About Rich Edit Controls.

Requirements

• Windows NT/2000 or later: Requires Windows NT 3.1 or later.
• Windows 95/98/Me: Requires Windows 95 or later.
• Version: Requires Rich Edit 1.0 or later.
• Header: Declared in Winuser.h; include Windows.h.

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Notebook exported on Monday, 7 July 2008, 18:56:50 PM Eastern Daylight Time