c# - WinForms: Detect when cursor enters/leaves the form or its controls -

i need way of detecting when cursor enters or leaves form. form.mouseenter/mouseleave doesn't work when controls fill form, have subscribe mouseenter event of controls (e.g. panels on form). other way of tracking form cursor entry/exit globally?

you can try :

private void form3_load(object sender, eventargs e) {   mousedetector m = new mousedetector();   m.mousemove += new mousedetector.mousemovedlg(m_mousemove); }  void m_mousemove(object sender, point p) {   point pt = this.pointtoclient(p);   this.text = (this.clientsize.width >= pt.x &&                 this.clientsize.height >= pt.y &&                 pt.x > 0 && pt.y > 0)?"in":"out";      } 

the mousedetector class :

using system; using system.collections.generic; using system.linq; using system.text; using system.runtime.interopservices; using system.windows.forms; using system.drawing;  class mousedetector {   #region apis    [dllimport("gdi32")]   public static extern uint getpixel(intptr hdc, int xpos, int ypos);    [dllimport("user32.dll", charset = charset.auto)]   public static extern bool getcursorpos(out point pt);    [dllimport("user32.dll", charset = charset.auto)]   public static extern intptr getwindowdc(intptr hwnd);    #endregion    timer tm = new timer() {interval = 10};   public delegate void mousemovedlg(object sender, point p);   public event mousemovedlg mousemove;   public mousedetector()   {                     tm.tick += new eventhandler(tm_tick); tm.start();   }    void tm_tick(object sender, eventargs e)   {     point p;     getcursorpos(out p);     if (mousemove != null) mousemove(this, new point(p.x,p.y));   }    [structlayout(layoutkind.sequential)]   public struct point   {     public int x;     public int y;     public point(int x, int y)     {       x = x;       y = y;     }   } }