private void setContext(android.view.MotionEvent curr)
{
if (mCurrEvent != null)
{
mCurrEvent.recycle();
}
mCurrEvent = android.view.MotionEvent.obtain(curr);
mCurrLen = -1;
mPrevLen = -1;
mScaleFactor = -1;
android.view.MotionEvent prev = mPrevEvent;
int prevIndex0 = prev.findPointerIndex(mActiveId0);
int prevIndex1 = prev.findPointerIndex(mActiveId1);
int currIndex0 = curr.findPointerIndex(mActiveId0);
int currIndex1 = curr.findPointerIndex(mActiveId1);
if (prevIndex0 < 0 || prevIndex1 < 0 || currIndex0 < 0 || currIndex1 < 0)
{
mInvalidGesture = true;
android.util.Log.e(TAG, "Invalid MotionEvent stream detected.", new System.Exception
());
if (mGestureInProgress)
{
mListener.onScaleEnd(this);
}
return;
}
float px0 = prev.getX(prevIndex0);
float py0 = prev.getY(prevIndex0);
float px1 = prev.getX(prevIndex1);
float py1 = prev.getY(prevIndex1);
float cx0 = curr.getX(currIndex0);
float cy0 = curr.getY(currIndex0);
float cx1 = curr.getX(currIndex1);
float cy1 = curr.getY(currIndex1);
float pvx = px1 - px0;
float pvy = py1 - py0;
float cvx = cx1 - cx0;
float cvy = cy1 - cy0;
mPrevFingerDiffX = pvx;
mPrevFingerDiffY = pvy;
mCurrFingerDiffX = cvx;
mCurrFingerDiffY = cvy;
mFocusX = cx0 + cvx * 0.5f;
mFocusY = cy0 + cvy * 0.5f;
mTimeDelta = curr.getEventTime() - prev.getEventTime();
mCurrPressure = curr.getPressure(currIndex0) + curr.getPressure(currIndex1);
mPrevPressure = prev.getPressure(prevIndex0) + prev.getPressure(prevIndex1);
}
private bool isConsideredDoubleTap(android.view.MotionEvent firstDown, android.view.MotionEvent
firstUp, android.view.MotionEvent secondDown)
{
if (!mAlwaysInBiggerTapRegion)
{
return(false);
}
if (secondDown.getEventTime() - firstUp.getEventTime() > DOUBLE_TAP_TIMEOUT)
{
return(false);
}
int deltaX = (int)firstDown.getX() - (int)secondDown.getX();
int deltaY = (int)firstDown.getY() - (int)secondDown.getY();
return(deltaX * deltaX + deltaY * deltaY < mDoubleTapSlopSquare);
}
/// <summary>Return the event time of the current event being processed.</summary>
/// <remarks>Return the event time of the current event being processed.</remarks>
/// <returns>Current event time in milliseconds.</returns>
public virtual long getEventTime()
{
return(mCurrEvent.getEventTime());
}