@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mLastY == -1) {
mLastY = ev.getRawY();
}
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastY = ev.getRawY();
break;
case MotionEvent.ACTION_MOVE:
final float deltaY = ev.getRawY() - mLastY;
mLastY = ev.getRawY();
if (getFirstVisiblePosition() == 0 && (mHeader.getVisibleHeight() > 0 || deltaY > 0)) {
// the first item is showing, header has shown or pull down.
updateHeaderHeight(deltaY / OFFSET_RADIO);
invokeOnScrolling();
} else if (getLastVisiblePosition() == mTotalItemCount - 1
&& (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
// last item, already pulled up or want to pull up.
updateFooterHeight(-deltaY / OFFSET_RADIO);
}
break;
default:
// reset
mLastY = -1;
if (getFirstVisiblePosition() == 0) {
// invoke refresh
if (mEnablePullRefresh && mHeader.getVisibleHeight() > mHeaderHeight) {
mPullRefreshing = true;
mHeader.setState(XHeaderView.STATE_REFRESHING);
refresh();
}
resetHeaderHeight();
} else if (getLastVisiblePosition() == mTotalItemCount - 1) {
// invoke load more.
if (mEnablePullLoad && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA) {
startLoadMore();
}
resetFooterHeight();
}
break;
}
return super.onTouchEvent(ev);
}
private void startLoadMore() {
if (!mPullLoading) {
mPullLoading = true;
mFooterView.setState(XFooterView.STATE_LOADING);
loadMore();
}
}
private void updateFooterHeight(float delta) {
int height = mFooterView.getBottomMargin() + (int) delta;
if (mEnablePullLoad && !mPullLoading) {
if (height > PULL_LOAD_MORE_DELTA) {
// height enough to invoke load more.
mFooterView.setState(XFooterView.STATE_READY);
} else {
mFooterView.setState(XFooterView.STATE_NORMAL);
}
}
mFooterView.setBottomMargin(height);
// scroll to bottom
// setSelection(mTotalItemCount - 1);
}
private void resetFooterHeight() {
int bottomMargin = mFooterView.getBottomMargin();
if (bottomMargin > 0) {
mScrollBack = SCROLL_BACK_FOOTER;
mScroller.startScroll(0, bottomMargin, 0, -bottomMargin, SCROLL_DURATION);
invalidate();
}
}
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
if (mScrollBack == SCROLL_BACK_HEADER) {
mHeader.setVisibleHeight(mScroller.getCurrY());
} else {
mFooterView.setBottomMargin(mScroller.getCurrY());
}
postInvalidate();
invokeOnScrolling();
}
super.computeScroll();
}
private void updateFooterHeight(float delta) {
int height = mFooterView.getBottomMargin() + (int) delta;
if (mEnablePullLoad && !mPullLoading) {
if (height > PULL_LOAD_MORE_DELTA) {
// height enough to invoke load more.
mFooterView.setState(XFooterView.STATE_READY);
} else {
mFooterView.setState(XFooterView.STATE_NORMAL);
}
}
mFooterView.setBottomMargin(height);
// scroll to bottom
post(
new Runnable() {
@Override
public void run() {
XScrollView.this.fullScroll(ScrollView.FOCUS_DOWN);
}
});
}
private void resetHeaderOrBottom() {
if (isTop()) {
// invoke refresh
if (mEnablePullRefresh && mHeader.getVisibleHeight() > mHeaderHeight) {
mPullRefreshing = true;
mHeader.setState(XHeaderView.STATE_REFRESHING);
refresh();
}
resetHeaderHeight();
} else if (isBottom()) {
// invoke load more.
if (mEnablePullLoad && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA) {
startLoadMore();
}
resetFooterHeight();
}
}
/**
* Enable or disable pull up load more feature.
*
* @param enable
*/
public void setPullLoadEnable(boolean enable) {
mEnablePullLoad = enable;
if (!mEnablePullLoad) {
mFooterView.setBottomMargin(0);
mFooterView.hide();
mFooterView.setPadding(0, 0, 0, mFooterView.getHeight() * (-1));
mFooterView.setOnClickListener(null);
} else {
mPullLoading = false;
mFooterView.setPadding(0, 0, 0, 0);
mFooterView.show();
mFooterView.setState(XFooterView.STATE_NORMAL);
// both "pull up" and "click" will invoke load more.
mFooterView.setOnClickListener(
new OnClickListener() {
@Override
public void onClick(View v) {
startLoadMore();
}
});
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mLastY == -1) {
mLastY = ev.getRawY();
}
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastY = ev.getRawY();
break;
case MotionEvent.ACTION_MOVE:
final float deltaY = ev.getRawY() - mLastY;
mLastY = ev.getRawY();
if (isTop() && (mHeader.getVisibleHeight() > 0 || deltaY > 0)) {
// the first item is showing, header has shown or pull down.
updateHeaderHeight(deltaY / OFFSET_RADIO);
invokeOnScrolling();
} else if (isBottom() && (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
// last item, already pulled up or want to pull up.
updateFooterHeight(-deltaY / OFFSET_RADIO);
}
break;
default:
// reset
mLastY = -1;
resetHeaderOrBottom();
break;
}
return super.onTouchEvent(ev);
}
/** Stop load more, reset footer view. */
public void stopLoadMore() {
if (mPullLoading) {
mPullLoading = false;
mFooterView.setState(XFooterView.STATE_NORMAL);
}
}
private boolean isBottom() {
return Math.abs(getScrollY() + getHeight() - computeVerticalScrollRange()) <= 5
|| (getScrollY() > 0 && null != mFooterView && mFooterView.getBottomMargin() > 0);
}
