public bool OnTouch(View v, MotionEvent evt)
{
if (view.touchListener != null)
{
view.touchListener.OnTouch(v, evt); // User-defined handler, maybe
}
view.mScaleDetector.OnTouchEvent(evt);
view.mGestureDetector.OnTouchEvent(evt);
PointF curr = new PointF(evt.GetX(), evt.GetY());
if (view.state == TouchState.NONE || view.state == TouchState.DRAG || view.state == TouchState.FLING)
{
switch (evt.Action)
{
case MotionEventActions.Down:
last.Set(curr);
if (view.fling != null)
{
view.fling.CancelFling();
}
view.SetState(TouchState.DRAG);
break;
case MotionEventActions.Move:
if (view.state == TouchState.DRAG)
{
float deltaX = curr.X - last.X;
float deltaY = curr.Y - last.Y;
float fixTransX = view.GetFixDragTrans(deltaX, view.viewWidth, view.GetImageWidth());
float fixTransY = view.GetFixDragTrans(deltaY, view.viewHeight, view.GetImageHeight());
view.matrix.PostTranslate(fixTransX, fixTransY);
view.FixTrans();
last.Set(curr.X, curr.Y);
}
break;
case MotionEventActions.Up:
case MotionEventActions.PointerUp:
view.SetState(TouchState.NONE);
break;
}
}
view.ImageMatrix = view.matrix;
//
// indicate event was handled
//
return(true);
}
public Fling(TouchImageView view, int velocityX, int velocityY)
{
this.view = view;
view.SetState(TouchState.FLING);
scroller = new Scroller(view.context);
view.matrix.GetValues(view.m);
int startX = (int)view.m[Matrix.MtransX];
int startY = (int)view.m[Matrix.MtransY];
int minX, maxX, minY, maxY;
if (view.GetImageWidth() > view.viewWidth)
{
minX = view.viewWidth - (int)view.GetImageWidth();
maxX = 0;
}
else
{
minX = maxX = startX;
}
if (view.GetImageHeight() > view.viewHeight)
{
minY = view.viewHeight - (int)view.GetImageHeight();
maxY = 0;
}
else
{
minY = maxY = startY;
}
scroller.Fling(startX, startY, (int)velocityX, (int)velocityY, minX, maxX, minY, maxY);
currX = startX;
currY = startY;
}
public void Run()
{
float t = Interpolate();
float deltaScale = CalculateDeltaScale(t);
view.ScaleImage(deltaScale, bitmapX, bitmapY, stretchImageToSuper);
TranslateImageToCenterTouchPosition(t);
view.FixScaleTrans();
view.ImageMatrix = view.matrix;
if (t < 1f)
{
//
// We haven't finished zooming
//
view.CompatPostOnAnimation(this);
}
else
{
//
// Finished zooming
//
view.SetState(TouchState.NONE);
}
}
public void CancelFling()
{
if (scroller != null)
{
view.SetState(TouchState.NONE);
scroller.ForceFinished(true);
}
}
public DoubleTapZoom(TouchImageView view, float targetZoom, float focusX, float focusY, bool stretchImageToSuper)
{
this.view = view;
view.SetState(TouchState.ANIMATE_ZOOM);
startTime = DateTime.Now.Ticks;
this.startZoom = view.normalizedScale;
this.targetZoom = targetZoom;
this.stretchImageToSuper = stretchImageToSuper;
PointF bitmapPoint = view.TransformCoordTouchToBitmap(focusX, focusY, false);
this.bitmapX = bitmapPoint.X;
this.bitmapY = bitmapPoint.Y;
//
// Used for translating image during scaling
//
startTouch = view.TransformCoordBitmapToTouch(bitmapX, bitmapY);
endTouch = new PointF(view.viewWidth / 2, view.viewHeight / 2);
}
public override bool OnScaleBegin(ScaleGestureDetector detector)
{
view.SetState(TouchState.ZOOM);
return(true);
}
