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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.   //菜單上邊界中點(diǎn)的X軸坐標為X
  
  
• TPM_LEFTALIGN    Positions the pop-up menu so that its left side is aligned with the coordinate specified by x.//菜單左邊界中點(diǎn)的X軸坐標為X
  
  
  
• TPM_RIGHTALIGN    Positions the pop-up menu so that its right side is aligned with the coordinate specified by x. //菜單右邊界中點(diǎn)的X軸坐標為X
  

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

• TPM_LEFTBUTTON    Causes the pop-up menu to track the left mouse button.
  //菜單跟蹤鼠標左鍵
  
• TPM_RIGHTBUTTON    Causes the pop-up menu to track the right mouse button.

           //菜單跟蹤鼠標右鍵

x:   設置菜單的X軸位置（屏幕坐標）

y:設置菜單的Y軸位置（屏幕坐標）

pWnd     指定菜單的父窗口。

lpRect   設置一個(gè)Rect結構或者一個(gè)CRect對象，在改矩形區域那按鼠標鍵，菜單不會(huì )消失；如果設為

NULL，只要在菜單以外的位置按鼠標鍵，菜單就會(huì )消失。