Two ways to track whether the mouse is in the window

The following two methods are provided to track whether the mouse is in the window.

1. Use setcapture () and onmousemove () to determine the mouse position

// Set a status to record and identify whether the mouse is in the window
// Bool m_bovercontrol;
Void CXXX: onmousemove (uint nflags, cpoint point)
{
Cstatic: onmousemove (nflags, point );
// If the mouse is still in the window
If (m_bovercontrol)
{
Crect rect;
Getclientrect (rect); // move the cursor away from the customer area, uncapture the mouse, and rewrite the status m_bovercontrol.
If (! Rect. ptinrect (point ))
{
M_bovercontrol = false;
Releasecapture ();
// Other operations such as redrawwindow () when the mouse leaves ();

Return;
}
} // If the mouse enters the window, place the mouse to capture, status parameter
Else
{
M_bovercontrol = true; // other operations when the mouse enters eg: redrawwindow ();
Setcapture ();
}
}

2. Send the wm_mouseleave message when the mouse leaves the window using trackmouseevent ()
Trackmouseevent () can also be used to determine the mouse stop and send the wm_mousehover message.

// Set a status to record and identify whether the mouse is in the window
Bool m_bmousetracking = false;
// Process the mouse-moving message
Void csomewnd: onmousemove (uint nflags, cpoint point)
{
// When wm_mousemove is received and m_bmousetracking is false, the mouse enters the window.
// SET _ trackmouseevent
If (! M_bmousetracking)
{
Trackmouseevent tme;
Tme. cbsize = sizeof (trackmouseevent );
Tme. dwflags = tme_leave; // monitor mouse exit
Tme. hwndtrack = This-> m_hwnd;
If (: _ trackmouseevent (& TME ))
{
M_bmousetracking = true;
// Other operations when the mouse enters
}
}
Cview: onmousemove (nflags, point );
}

Process wm_mouseleave messages
Message Processing Function declaration afx_msg lresult onmouseleave (wparam, lparam );
Message ing on_message (wm_mouseleave, onmouseleave)
Processing Function Definition

Lresult csomewnd: onmouseleave (wparam, lparam)
{
// Other operations when the mouse leaves

// Number of Reset statuses
M_bmousetracking = false;
Return true;
}


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Process the message when the mouse leaves the window (wm_mouseleave)
Wm_mouseleave is a message sent when the mouse leaves the window, but this message is different from the common mouse message. To receive the wm_mouseleave message, you must first call trackmouseevent, and each call to the trackmouseevent window can only receive wm_mouseleave once, that is to say, if you want to obtain the wm_mouseleave message, you must call trackmouseevent once when the mouse enters the window again.

Static bool btrackleave = false;
Void cmywnd: onmousemove (uint nflags, cpoint point)
{
If (! Btrackleave)
{
// When the mouse moves into the window for the first time, a message wm_mouseleave is requested.
Trackmouseevent tme;
Tme. cbsize = sizeof (TME );
Tme. hwndtrack = m_hwnd;
Tme. dwflags = tme_leave;
_ Trackmouseevent (& TME );
Btrackleave = true;
// Add the code for processing the mouse entry here:
....................................
}
}

Manually add message ing and message processing functions
Begin_message_map (cmywnd, cwnd)
// {Afx_msg_map (cmywnd)
...........................
//} Afx_msg_map
On_message (wm_mouseleave, onmouseleave)
End_message_map ()

Lparam cmywnd: onmouseleave (wparam WP, lparam LP)
{
Btrackleave = false;
// Add the code for processing the mouse exit here:
.........................................
Return 0;
}