@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 updateHeaderHeight(float delta) {
mHeader.setVisibleHeight((int) delta + mHeader.getVisibleHeight());
if (mEnablePullRefresh && !mPullRefreshing) {
// update the arrow image unrefreshing
if (mHeader.getVisibleHeight() > mHeaderHeight) {
mHeader.setState(XHeaderView.STATE_READY);
} else {
mHeader.setState(XHeaderView.STATE_NORMAL);
}
}
// scroll to top each time
setSelection(0);
}
private void updateHeaderHeight(float delta) {
mHeader.setVisibleHeight((int) delta + mHeader.getVisibleHeight());
if (mEnablePullRefresh && !mPullRefreshing) {
// update the arrow image unrefreshing
if (mHeader.getVisibleHeight() > mHeaderHeight) {
mHeader.setState(XHeaderView.STATE_READY);
} else {
mHeader.setState(XHeaderView.STATE_NORMAL);
}
}
// scroll to top each time
post(
new Runnable() {
@Override
public void run() {
XScrollView.this.fullScroll(ScrollView.FOCUS_UP);
}
});
}
/** Auto call back refresh. */
public void autoRefresh() {
mHeader.setVisibleHeight(mHeaderHeight);
if (mEnablePullRefresh && !mPullRefreshing) {
// update the arrow image not refreshing
if (mHeader.getVisibleHeight() > mHeaderHeight) {
mHeader.setState(XHeaderView.STATE_READY);
} else {
mHeader.setState(XHeaderView.STATE_NORMAL);
}
}
mPullRefreshing = true;
mHeader.setState(XHeaderView.STATE_REFRESHING);
refresh();
}
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();
}
}
private void resetHeaderHeight() {
int height = mHeader.getVisibleHeight();
if (height == 0) return;
// refreshing and header isn't shown fully. do nothing.
if (mPullRefreshing && height <= mHeaderHeight) return;
// default: scroll back to dismiss header.
int finalHeight = 0;
// is refreshing, just scroll back to show all the header.
if (mPullRefreshing && height > mHeaderHeight) {
finalHeight = mHeaderHeight;
}
mScrollBack = SCROLL_BACK_HEADER;
mScroller.startScroll(0, height, 0, finalHeight - height, SCROLL_DURATION);
// trigger computeScroll
invalidate();
}
@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);
}
private boolean isTop() {
return getScrollY() <= 0
|| mHeader.getVisibleHeight() > mHeaderHeight
|| mContentLayout.getTop() > 0;
}
