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Summary

The TrackMouseEvent API

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static extern bool TrackMouseEvent(ref TRACKMOUSEEVENT lpEventTrack);

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        static extern int TrackMouseEvent(ref TRACKMOUSEEVENT lpEventTrack);

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        public struct TRACKMOUSEEVENT

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            public TRACKMOUSEEVENT(Int32 dwFlags, IntPtr hWnd, UInt32 dwHoverTime)

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                this.cbSize = Marshal.SizeOf(typeof(TRACKMOUSEEVENT));

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        TRACKMOUSEEVENT tme; // Define it on the outside so you dont recreate it each time the mouse enters

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            tme = new TRACKMOUSEEVENT();            

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            tme.cbSize = Marshal.SizeOf(typeof(TRACKMOUSEEVENT)); // make sure it gets correct size in different platforms

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            TrackMouseEvent(ref tme);            

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            /// The function fills in the structure instead of treating it as a tracking request. The structure is filled such that had that structure been passed to TrackMouseEvent, it would generate the current tracking. The only anomaly is that the hover time-out returned is always the actual time-out and not HOVER_DEFAULT, if HOVER_DEFAULT was specified during the original TrackMouseEvent request.

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Documentation

[TrackMouseEvent] on MSDN

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WM_MOUSEHOVER

0x2A1

The WM_MOUSEHOVER message is posted to a window when the cursor hovers over the client area of the window for the period of time specified in a prior call to TrackMouseEvent.

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WM_MOUSELEAVE

0x2A3

The WM_MOUSELEAVE message is posted to a window when the cursor leaves the client area of the window specified in a prior call to TrackMouseEvent.

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WM_NCMOUSEHOVER

0x2A0

The WM_NCMOUSEHOVER message is posted to a window when the cursor hovers over the nonclient area of the window for the period of time specified in a prior call to TrackMouseEvent.

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WM_NCMOUSELEAVE

0x2A2

The WM_NCMOUSELEAVE message is posted to a window when the cursor leaves the nonclient area of the window specified in a prior call to TrackMouseEvent.

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public struct TRACKMOUSEEVENT {

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Public Structure TRACKMOUSEEVENT

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Documentation

[TRACKMOUSEEVENT] on MSDN

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    /// The WM_MOUSEHOVER message is posted to a window when the cursor hovers over the client area of the window for the period of time specified in a prior call to TrackMouseEvent.

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    /// The WM_MOUSELEAVE message is posted to a window when the cursor leaves the client area of the window specified in a prior call to TrackMouseEvent.

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    /// The WM_NCMOUSEHOVER message is posted to a window when the cursor hovers over the nonclient area of the window for the period of time specified in a prior call to TrackMouseEvent.

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    /// The WM_NCMOUSELEAVE message is posted to a window when the cursor leaves the nonclient area of the window specified in a prior call to TrackMouseEvent.

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    '''The WM_MOUSEHOVER message is posted to a window when the cursor hovers over the client area of the window for the period of time specified in a prior call to TrackMouseEvent.

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    '''The WM_MOUSELEAVE message is posted to a window when the cursor leaves the client area of the window specified in a prior call to TrackMouseEvent.

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    ''' The WM_NCMOUSELEAVE message is posted to a window when the cursor leaves the nonclient area of the window specified in a prior call to TrackMouseEvent.

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    ''' period of time specified in a prior call to <c>TrackMouseEvent</c>.

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    ''' window specified in a prior call to <c>TrackMouseEvent</c>.

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    ''' window specified in a prior call to <c>TrackMouseEvent</c>.