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Add alpha change listener #47

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Add alpha change listener #47

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13 changes: 13 additions & 0 deletions library/src/com/manuelpeinado/fadingactionbar/FadingActionBarHelperBase.java
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Original file line number Diff line number Diff line change
Expand Up @@ -299,7 +299,17 @@ public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCoun
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
};

private int mLastScrollPosition;
private OnAlphaChangeListener mOnAlphaChangeListener;

public static interface OnAlphaChangeListener {
void onAlphaChanged(int alpha);
}

public void setOnAlphaChangeListener(OnAlphaChangeListener l) {
mOnAlphaChangeListener = l;
}

private void onNewScroll(int scrollPosition) {
if (isActionBarNull()) {
Expand All @@ -315,6 +325,9 @@ private void onNewScroll(int scrollPosition) {
float ratio = (float) Math.min(Math.max(scrollPosition, 0), headerHeight) / headerHeight;
int newAlpha = (int) (ratio * 255);
mActionBarBackgroundDrawable.setAlpha(newAlpha);
if (mOnAlphaChangeListener != null) {
mOnAlphaChangeListener.onAlphaChanged(newAlpha);
}

addParallaxEffect(scrollPosition);
}
Expand Down