CMenu::TrackPopupMenu

CMenu::TrackPopupMenu

Call this member function to display a floating pop-up menu at the specified location, and track the selection of items on the pop-up menu.

Syntax

BOOL TrackPopupMenu ( UINT nFlags, int x, int y, CWnd* pWnd, LPCRECT lpRect = 0 );

nFlags

Specifies a screen-position flag and a mouse-button flag. The screen-position flag can be one of the following:

• TPM_CENTERALIGN    Centers the pop-up menu horizontally relative to the coordinate specified by x.   //菜单上边界中点的X轴坐标为X
  
  
• TPM_LEFTALIGN    Positions the pop-up menu so that its left side is aligned with the coordinate specified by x.//菜单左边界中点的X轴坐标为X
  
  
  
• TPM_RIGHTALIGN    Positions the pop-up menu so that its right side is aligned with the coordinate specified by x. //菜单右边界中点的X轴坐标为X
  

  The mouse-button flag can be either of the following:

• TPM_LEFTBUTTON    Causes the pop-up menu to track the left mouse button.
  //菜单跟踪鼠标左键
  
• TPM_RIGHTBUTTON    Causes the pop-up menu to track the right mouse button.

           //菜单跟踪鼠标右键

x:   设置菜单的X轴位置（屏幕坐标）

y:设置菜单的Y轴位置（屏幕坐标）

pWnd     指定菜单的父窗口。

lpRect   设置一个Rect结构或者一个CRect对象，在改矩形区域那按鼠标键，菜单不会消失；如果设为

NULL，只要在菜单以外的位置按鼠标键，菜单就会消失。