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滑动到指定条目 #60

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26 changes: 26 additions & 0 deletions loopview/src/main/java/com/weigan/loopview/LoopView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -368,6 +368,32 @@ public void setCurrentPosition(int position) {
}
}


/**
* scroll to designated item
*
* @param i
*/
public void smoothScrollToItem(int i) {
if (items == null || items.isEmpty()) {
return;
}
if (i < 0) {
i = 0;
}
if (i > items.size() - 1) {
i = items.size() - 1;
}
cancelFuture();
float itemHeight = lineSpacingMultiplier * maxTextHeight;
int i1 = i - getSelectedItem();
if (i1 == 0)
return;
mFuture = mExecutor.scheduleWithFixedDelay(new SmoothScrollTimerTask(this, (int) (itemHeight * i1)), 0, 15, TimeUnit.MILLISECONDS);
invalidate();
}


@Override
protected void onDraw(Canvas canvas) {
if (items == null) {
Expand Down