@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mStickHeaderMap.isEmpty()) {
return;
}
// measure header size
int totalHeight = getPaddingTop();
int width = getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
int widthSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);
int heightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
int size = mHeaderViews.size();
for (int i = 0; i < size; i++) {
View view = mHeaderViews.get(i);
view.measure(widthSpec, heightSpec);
if (mStickHeaderMap.containsKey(view)) {
StickView stickView = mStickHeaderMap.get(view);
if (stickView.top == INVALID_TOP) {
stickView.top = Math.min(totalHeight, getMeasuredHeight() - getPaddingBottom());
}
ViewGroup.LayoutParams params = stickView.placeHolderView.getLayoutParams();
params.width = view.getMeasuredWidth();
params.height = view.getMeasuredHeight();
}
totalHeight += (view.getMeasuredHeight() + mListView.getDividerHeight());
}
}
@Override
public void onScroll(
AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (null != mDelegateScrollListener) {
mDelegateScrollListener.onScroll(
view, firstVisibleItem, visibleItemCount, totalItemCount);
}
int maxStickTop = getPaddingTop();
int size = mHeaderViews.size();
int lastVisibleItem = firstVisibleItem + visibleItemCount - 1;
for (int i = 0; i < size; i++) {
View v = mHeaderViews.get(i);
if (!mStickHeaderMap.containsKey(v)) {
continue;
}
StickView stickView = mStickHeaderMap.get(v);
if (i <= firstVisibleItem) {
// top the view
if (v.getTop() != maxStickTop) {
stickView.top = maxStickTop;
v.layout(v.getLeft(), maxStickTop, v.getRight(), maxStickTop + v.getHeight());
Log.d(TAG, "layout stick header " + stickView.position + "to " + maxStickTop);
}
maxStickTop += v.getHeight();
} else if (i > firstVisibleItem && i <= lastVisibleItem) {
int alignTop =
Math.max(stickView.placeHolderView.getTop() + getPaddingTop(), maxStickTop);
if (v.getTop() != alignTop) {
stickView.top = alignTop;
v.layout(v.getLeft(), alignTop, v.getRight(), alignTop + v.getHeight());
Log.d(TAG, "layout stick header " + stickView.position + "to " + alignTop);
}
maxStickTop = alignTop + v.getHeight();
} else {
if (v.getTop() != getHeight() - getPaddingBottom()) {
stickView.top = getHeight() - getPaddingBottom();
v.layout(v.getLeft(), stickView.top, v.getRight(), stickView.top + v.getHeight());
Log.d(
TAG,
"layout stick header " + stickView.position + "to " + stickView.toString());
}
}
}
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
SavedState savedState = (SavedState) state;
super.onRestoreInstanceState(savedState.getSuperState());
int size = mHeaderViews.size();
int index = 0;
for (int i = 0; i < size; i++) {
View view = mHeaderViews.get(i);
if (!mStickHeaderMap.containsKey(view)) {
continue;
}
StickView stickView = mStickHeaderMap.get(view);
stickView.top = savedState.viewTops[index];
index++;
if (index >= mStickHeaderMap.size()) {
break;
}
}
}