WM_CONTEXTMENU (Compact 2013)

3/28/2014

This message notifies a window that the user clicked the right mouse button (right-clicked) in the window.

Syntax

WM_CONTEXTMENU
    WPARAM wParam;
    LPARAM lParam;

Parameters

• wParam
  Handle to the window in which the user right-clicked the mouse. This can be a child window of the window receiving the message. For more information about processing this message, see the Remarks section.

• lParam
  The low-order word specifies the horizontal position of the cursor, in screen coordinates, at the time of the mouse click.

  The high-order word specifies the vertical position of the cursor, in screen coordinates, at the time of the mouse click.

Return Value

None.

Remarks

A window can process this message by displaying a shortcut menu using the TrackPopupMenu or TrackPopupMenuEx function. To obtain the horizontal and vertical positions, use the following code:

xPos = GET_X_LPARAM(lParam);
yPos = GET_Y_LPARAM(lParam);

If a window does not display a shortcut menu it should pass this message to the DefWindowProc function. For child windows, DefWindowProc sends the message to the parent. Otherwise, DefWindowProc displays a default shortcut menu if the specified position is in the window's caption.

DefWindowProc generates the WM_CONTEXTMENU message when it processes the WM_RBUTTONUP message or when the user presses and releases the VK_APPS key.

If the context menu is generated from the keyboard, then the x- and y-coordinates are -1 and the application should display the context menu at the location of the current selection rather than at (xPos, yPos).

Requirements

See Also

Reference

Menu Messages
DefWindowProc
TrackPopupMenu
TrackPopupMenuEx
WM_RBUTTONUP