@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
this.width = w;
this.height = h;
itemWidth = Math.min(itemWidth, width);
int number = height / itemHeight;
if ((number & 1) == 1) {
this.numberPerPage = number;
} else {
this.numberPerPage = number - 1;
}
this.topBottomPadding = (height - numberPerPage * itemHeight) / 2;
this.leftRightPadding = (width - itemWidth) / 2;
this.originalSelectedIndex = 0;
this.selectedIndex = 0;
itemList = new ArrayList<ItemView>();
for (int i = -numberPerPage / 2; i < stringList.size() + numberPerPage / 2; i++) {
ItemView itemView = new ItemView(getContext());
itemView.setIndex(i);
itemView.setyOffset((i + numberPerPage / 2) * itemHeight);
LogUtil.i("chenxu", "onSizeChanged:i:" + i + " yoffset:" + itemView.getyOffset());
if (i >= 0 && i < stringList.size()) {
itemView.setText(stringList.get(i));
} else {
itemView.setText("");
}
itemList.add(itemView);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
LogUtil.i("chenxu", "---------------------------------");
for (int i = 0; i < itemList.size(); i++) {
ItemView itemView = itemList.get(i);
LogUtil.i("chenxu", "onDraw:i:" + i + " yoffset:" + itemView.getyOffset());
// if (isInView(itemView.getIndex())) {
itemView.drawSelf(canvas);
// }
}
LogUtil.i("chenxu", "---------------------------------");
}
public void scrollLeft(int velocityX) {
int processedVelocityX = velocityX / 2;
int index = (int) (getScrollX() + itemWidth / 2) / itemWidth;
int currentScrollX = padNumber * itemWidth + itemWidth / 2 + getScrollX();
int leftScrollX = padNumber * itemWidth + itemWidth / 2 + Math.max(0, index) * itemWidth;
int rightScrollX =
padNumber * itemWidth
+ itemWidth / 2
+ Math.min(imageViewList.size() - 1, index + 1) * itemWidth;
int dx = 0;
int leftAbs = Math.abs(currentScrollX - leftScrollX);
int rightAbs = Math.abs(currentScrollX - rightScrollX);
if (leftAbs >= rightAbs) {
dx = -processedVelocityX / itemWidth * itemWidth - (rightScrollX - currentScrollX);
} else {
dx = -processedVelocityX / itemWidth * itemWidth + (currentScrollX - leftScrollX);
}
while (dx > (itemWidth * (imageIdList.size() - 1) - getScrollX())) {
dx -= itemWidth;
}
int duration = (int) Math.abs(500.0f / itemWidth * dx);
LogUtil.i("chenxu", "scrollLeft dx:" + dx + " duration:" + duration);
scroller.startScroll(getScrollX(), 0, dx, 0, duration);
invalidate();
}
@Override
public void computeScroll() {
super.computeScroll();
if (scroller.computeScrollOffset()) {
LogUtil.i("chenxu", "scroller.getCurrentY():" + scroller.getCurrY());
scrollTo(0, scroller.getCurrY());
postInvalidate();
} else {
// setCurrentIndex(Math.min(list.size() - 1,
// Math.max(0, currentIndex + (int) (velocity / 20))));
}
}
public boolean onSingleTapUp(MotionEvent e) {
// LogUtil.i("chenxu", "onSingleTapUp e.getX():" + e.getX()
// + " e.getRawX():" + e.getRawX());
int index = (int) (e.getX() + getScrollX() - padNumber * itemWidth) / itemWidth;
LogUtil.i("chenxu", "calculated index:" + index);
if (isIndexValid(index)) {
if (listener != null) {
listener.coverFlowDidClick(index);
}
return true;
} else {
return false;
}
};
public void moveByOffset(float offset, float accumulatedOffset) {
for (int i = 0; i < itemList.size(); i++) {
ItemView itemView = itemList.get(i);
itemView.setyOffset((int) (itemView.getyOffset() + offset));
;
}
selectedIndex =
(int)
Math.min(
stringList.size(),
Math.max(
0,
(originalSelectedIndex - (accumulatedOffset + itemHeight / 2) / itemHeight)));
LogUtil.i("chenxu", "moveByOffset-selectedIndex:" + selectedIndex);
invalidate();
}
public void scrollBack() {
int index = (int) (getScrollX() + itemWidth / 2) / itemWidth;
int currentScrollX = padNumber * itemWidth + itemWidth / 2 + getScrollX();
int leftScrollX = padNumber * itemWidth + itemWidth / 2 + Math.max(0, index) * itemWidth;
int rightScrollX =
padNumber * itemWidth
+ itemWidth / 2
+ Math.min(imageViewList.size() - 1, index + 1) * itemWidth;
int dx = 0;
int leftAbs = Math.abs(currentScrollX - leftScrollX);
int rightAbs = Math.abs(currentScrollX - rightScrollX);
if (leftAbs >= rightAbs) {
dx = -(rightScrollX - currentScrollX);
} else {
dx = currentScrollX - leftScrollX;
}
int duration = (int) Math.abs(500.0f / itemWidth * dx);
LogUtil.i("chenxu", "scrollBack dx:" + dx + " duration:" + duration);
scroller.startScroll(getScrollX(), 0, dx, 0, duration);
invalidate();
}