@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder;
View view = convertView;
if (view == null) {
view = LayoutInflater.from(context).inflate(R.layout.grid_item, parent, false);
holder = new Holder();
holder.title = (TextView) view.findViewById(R.id.grid_item_title);
holder.cover = (ImageView) view.findViewById(R.id.grid_item_cover);
view.setTag(holder);
} else {
holder = (Holder) view.getTag();
}
GridItem item = list.get(position);
holder.title.setText(item.getTitle());
holder.cover.setImageBitmap(BrowserUnit.file2Bitmap(context, item.getFilename()));
ViewUnit.setElevation(
view, context.getResources().getDimensionPixelSize(R.dimen.elevation_1dp));
return view;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if (!callback.canSwipe()) return false;
event.offsetLocation(translationX, 0);
if (targetWidth < 2) targetWidth = view.getWidth();
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
{
downX = event.getRawX();
velocityTracker = VelocityTracker.obtain();
velocityTracker.addMovement(event);
return false;
}
case MotionEvent.ACTION_UP:
{
if (velocityTracker == null) break;
velocityTracker.addMovement(event);
velocityTracker.computeCurrentVelocity(1000);
if (swiping) {
view.animate()
.translationX(0f)
.setDuration(animTime)
.setListener(
new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
callback.onBound(canSwitch, swipingLeft);
}
});
}
downX = 0;
translationX = 0;
swiping = false;
velocityTracker.recycle();
velocityTracker = null;
break;
}
case MotionEvent.ACTION_CANCEL:
{
if (velocityTracker == null) {
break;
}
view.animate().translationX(0f).setDuration(animTime).setListener(null);
downX = 0;
translationX = 0;
swiping = false;
velocityTracker.recycle();
velocityTracker = null;
break;
}
case MotionEvent.ACTION_MOVE:
{
if (velocityTracker == null) {
break;
}
velocityTracker.addMovement(event);
float deltaX = event.getRawX() - downX;
if (Math.abs(deltaX) > slop) {
swiping = true;
swipingLeft = deltaX < 0;
canSwitch =
Math.abs(deltaX)
>= ViewUnit.dp2px(
view.getContext(),
48); // Can switch tabs when deltaX >= 48 to prevent misuse
swipingSlop = (deltaX > 0 ? slop : -slop);
view.getParent().requestDisallowInterceptTouchEvent(true);
MotionEvent cancelEvent = MotionEvent.obtainNoHistory(event);
cancelEvent.setAction(
MotionEvent.ACTION_CANCEL
| (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
view.onTouchEvent(cancelEvent);
cancelEvent.recycle();
}
if (swiping) {
translationX = deltaX;
view.setTranslationX(deltaX - swipingSlop);
callback.onSwipe();
return true;
}
break;
}
}
return false;
}