@Override
protected void onFinishInflate() {
super.onFinishInflate();
mHandleView = findViewById(R.id.handle);
loadDimens();
if (DEBUG) LOG("handle view: " + mHandleView);
if (mHandleView != null) {
mHandleView.setOnTouchListener(
new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
final float y = event.getY();
final float rawY = event.getRawY();
if (DEBUG)
LOG(
"handle.onTouch: a=%s y=%.1f rawY=%.1f off=%.1f",
MotionEvent.actionToString(event.getAction()), y, rawY, mTouchOffset);
PanelView.this.getLocationOnScreen(mAbsPos);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mTracking = true;
mHandleView.setPressed(true);
postInvalidate(); // catch the press state change
mInitialTouchY = y;
mVelocityTracker = VelocityTracker.obtain();
trackMovement(event);
mTimeAnimator.cancel(); // end any outstanding animations
mBar.onTrackingStarted(PanelView.this);
mTouchOffset = (rawY - mAbsPos[1]) - PanelView.this.getExpandedHeight();
if (mExpandedHeight == 0) {
mJustPeeked = true;
runPeekAnimation();
}
break;
case MotionEvent.ACTION_MOVE:
final float h = rawY - mAbsPos[1] - mTouchOffset;
if (h > mPeekHeight) {
if (mPeekAnimator != null && mPeekAnimator.isRunning()) {
mPeekAnimator.cancel();
}
mJustPeeked = false;
}
if (!mJustPeeked) {
PanelView.this.setExpandedHeightInternal(h);
mBar.panelExpansionChanged(PanelView.this, mExpandedFraction);
}
trackMovement(event);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mFinalTouchY = y;
mTracking = false;
mHandleView.setPressed(false);
postInvalidate(); // catch the press state change
mBar.onTrackingStopped(PanelView.this);
trackMovement(event);
float vel = 0, yVel = 0, xVel = 0;
boolean negative = false;
if (mVelocityTracker != null) {
// the velocitytracker might be null if we got a bad input stream
mVelocityTracker.computeCurrentVelocity(1000);
yVel = mVelocityTracker.getYVelocity();
negative = yVel < 0;
xVel = mVelocityTracker.getXVelocity();
if (xVel < 0) {
xVel = -xVel;
}
if (xVel > mFlingGestureMaxXVelocityPx) {
xVel = mFlingGestureMaxXVelocityPx; // limit how much we care about the x axis
}
vel = (float) Math.hypot(yVel, xVel);
if (vel > mFlingGestureMaxOutputVelocityPx) {
vel = mFlingGestureMaxOutputVelocityPx;
}
mVelocityTracker.recycle();
mVelocityTracker = null;
}
// if you've barely moved your finger, we treat the velocity as 0
// preventing spurious flings due to touch screen jitter
final float deltaY = Math.abs(mFinalTouchY - mInitialTouchY);
if (deltaY < mFlingGestureMinDistPx || vel < mFlingExpandMinVelocityPx) {
vel = 0;
}
if (negative) {
vel = -vel;
}
if (DEBUG) LOG("gesture: dy=%f vel=(%f,%f) vlinear=%f", deltaY, xVel, yVel, vel);
fling(vel, true);
break;
}
return true;
}
});
}
}
