android - What are correct callback methods to implement custom toolbar with scrolling and various gesture features? -


implement toolbar control custom view regarding: goal achieve scrolling features using xamarin.android framework , without using actionbar according business requirement. required features left , right swipe, drag tool bar buttons, fling etc.

the scroll should work more accuracy ex: if user scrolls (or flings) tool bar fast left right or right left, should directly show last button. i.e. similar actionbar comes of modern android devices.

what correct call-back method achieve please

the high level design considerations are: toolbar button class implements imagebutton. toolbar button designed inner class of toolbarcontrol class custom view implementing viewgroup not want use actionbar @ moment. want override onmeasure, onlayout methods , implement ontouch() , onfling(). override onintercepttouchevent(motionevent ev), ontouchevent(motionevent ev). based on sample code in http://developer.android.com/training/gestures/index.html

code snippet:

//to implement scrolling //to watch events viewgroup dispatched child views public override bool onintercepttouchevent(motionevent e) {     //system.out.println(...)     console.writeline("onintercepttouchevent");     boolean intercept = false;     viewconfiguration configuration = viewconfiguration                           .get(context);     int mtouchslop = configuration.scaledtouchslop;     try     {         switch (e.action)         {             case motioneventactions.move:                 {                     int xdiff = (int)math.abs(e.getx() - m_flastx);                     if (xdiff > mtouchslop)                     {                         m_ntouchstate = c_ntouchstatehorizontalscrolling;                         m_flastx = e.getx();                     }                     int ydiff = (int)math.abs(e.gety() - m_flasty);                     if (ydiff > mtouchslop)                     {                         m_ntouchstate = -1;                     }                     if (math.abs(xdiff * 2) > math.abs(ydiff) && xdiff > mtouchslop)                     {                         intercept = true;                     }                      break;                 }              case motioneventactions.cancel:             case motioneventactions.up:                 // release drag.                 m_ntouchstate = c_ntouchstaterest;                 break;             case motioneventactions.down:                 m_flasty = e.gety();                 m_flastx = e.getx();                 break;             default:                 break;         }     }     catch (exception ex)     {     }     return intercept; }  public override bool ontouchevent(motionevent e) {      //system.out.println(...)      console.writeline("tb ontouchevent");     try     {         float x = e.getx();         float y = e.gety();         switch (e.action)         {             case motioneventactions.down:                 if (!m_scroller.isfinished)                 {                     m_scroller.abortanimation();                 }                 m_flastx = x;                 if (m_scroller.isfinished)                 {                     m_ntouchstate = c_ntouchstaterest;                 }                 else                 {                     m_ntouchstate = c_ntouchstatehorizontalscrolling;                 }                 break;              case motioneventactions.move:                 int deltax = (int)(m_flastx - x);                 m_flastx = x;                 int scrollx = scrollx;                 // scroll right                 if (deltax < 0)                 {                     if (scrollx > 0)                     {                         scrollby(math.max(-scrollx, deltax), 0);                     }                 }                 // scroll left                 else if (deltax > 0)                 {                     // visible full icons without empty spaces                      int availabletoscroll =                             getchildat(childcount - 1).right - scrollx - (display.width - c_ntoolindent);                      if (availabletoscroll > 0)                     {                         scrollby(math.min(availabletoscroll, deltax), 0);                     }                 }                 break;


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