public void OnTouchEvent(global::Android.Views.MotionEvent e, CanvasContent content)
{
if (content == null)
{
throw new ArgumentNullException("content");
}
if (e == null)
{
throw new ArgumentNullException("e");
}
var began = new List <CanvasTouch> ();
var moved = new List <CanvasTouch> ();
var ended = new List <CanvasTouch> ();
var cancelled = new List <CanvasTouch> ();
var pointerCount = e.PointerCount;
var actionMasked = e.Action & global::Android.Views.MotionEventActions.Mask;
var actionIndex = (int)(e.Action & global::Android.Views.MotionEventActions.PointerIdMask) >> (int)global::Android.Views.MotionEventActions.PointerIdShift;
var actionId = e.GetPointerId(actionIndex);
//Log.WriteLine("a = {0}, index = {1}, id = {2}, c = {3}", actionMasked, actionIndex, actionId, pointerCount);
switch (actionMasked)
{
case global::Android.Views.MotionEventActions.Move:
for (var index = 0; index < pointerCount; index++)
{
var id = e.GetPointerId(index);
if (id < MaxTouchId)
{
var t = _activeTouches[id];
if (t != null)
{
var curSuperLoc = t.SuperCanvasLocation;
var newSuperLoc = new System.Drawing.PointF(e.GetX(index), e.GetY(index));
var dx = curSuperLoc.X - newSuperLoc.X;
var dy = curSuperLoc.Y - newSuperLoc.Y;
if (t.IsMoving ||
(Math.Abs(dx) > _initialMoveResolution ||
Math.Abs(dy) > _initialMoveResolution) ||
NumActiveTouches > 1)
{
t.SuperCanvasPreviousLocation = t.SuperCanvasLocation;
t.CanvasPreviousLocation = t.CanvasLocation;
t.PreviousTime = t.Time;
t.IsMoving = true;
t.SuperCanvasLocation = newSuperLoc;
t.CanvasLocation = LocationFromView(t.SuperCanvasLocation);
t.Time = DateTime.UtcNow;
moved.Add(t);
_longClickToken = -1;
}
}
}
}
break;
case global::Android.Views.MotionEventActions.Down:
case global::Android.Views.MotionEventActions.PointerDown:
if (actionId < MaxTouchId)
{
var t = new AndroidTouch {
Handle = new IntPtr(actionId + 1), // +1 because IntPtr=0 is special
SuperCanvasLocation = new System.Drawing.PointF(e.GetX(actionIndex), e.GetY(actionIndex)),
Time = DateTime.UtcNow,
TapCount = 1,
};
t.CanvasLocation = LocationFromView(t.SuperCanvasLocation);
t.CanvasPreviousLocation = t.CanvasLocation;
t.SuperCanvasPreviousLocation = t.SuperCanvasLocation;
t.PreviousTime = t.Time;
began.Add(t);
_activeTouches[actionId] = t;
//
// Detect double tap
//
if ((t.Time - _lastBeganTime).TotalMilliseconds <= _doubleTapTimeoutMillis &&
Math.Abs(_lastBeganLocation.X - t.SuperCanvasLocation.X) <= _doubleTapResolution &&
Math.Abs(_lastBeganLocation.Y - t.SuperCanvasLocation.Y) <= _doubleTapResolution)
{
t.TapCount = 2;
}
else
{
//
// Detect long press
//
if (NumActiveTouches == 1)
{
var tok = _longClickTokenGenerator.Next();
_handler.PostDelayed(() => { HandleLongClick(tok, content); }, _longClickTimeoutMillis);
_longClickToken = tok;
}
else
{
_longClickToken = -1;
}
}
_lastBeganTime = t.Time;
_lastBeganLocation = t.SuperCanvasLocation;
}
break;
case global::Android.Views.MotionEventActions.Up:
case global::Android.Views.MotionEventActions.PointerUp:
if (actionId < MaxTouchId)
{
var t = _activeTouches[actionId];
if (t != null)
{
t.Time = DateTime.UtcNow;
_activeTouches[actionId] = null;
ended.Add(t);
}
_longClickToken = -1;
}
break;
}
if (began.Count > 0)
{
content.TouchesBegan(began.ToArray(), CanvasKeys.None);
}
if (moved.Count > 0)
{
content.TouchesMoved(moved.ToArray());
}
if (ended.Count > 0)
{
content.TouchesEnded(ended.ToArray());
}
if (cancelled.Count > 0)
{
content.TouchesCancelled(cancelled.ToArray());
}
}
public override void Draw(global::Android.Graphics.Canvas canvas)
{
//
// Start drawing
//
var del = Content;
if (del == null)
{
return;
}
var startT = DateTime.Now;
var _graphics = new AndroidGraphics(canvas);
_graphics.SaveState();
_graphics.Scale(Zoom, Zoom);
//
// Draw
//
del.Frame = new RectangleF(0, 0, Width / Zoom, Height / Zoom);
try {
del.Draw(_graphics);
}
catch (Exception) {
}
_graphics.RestoreState();
var endT = DateTime.Now;
_drawTime += (endT - startT).TotalSeconds;
_drawCount++;
//
// Throttle
//
if (_running && _drawCount > 2 && (DateTime.Now - _lastThrottleTime) >= ThrottleInterval)
{
_lastThrottleTime = DateTime.Now;
var maxfps = 1.0 / (_drawTime / _drawCount);
_drawTime = 0;
_drawCount = 0;
var fps = ClampUpdateFreq((int)(maxfps * CpuUtilization));
if (Math.Abs(fps - _fps) > 1)
{
_fps = fps;
Start();
}
}
//
// Notify
//
var df = DrewFrame;
if (df != null)
{
df(this, EventArgs.Empty);
}
if (_running)
{
_handler.PostDelayed(HandleDrawTimerElapsed, 1000 / _fps);
}
}