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Add support for dynamically changing the background drawable #44

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Add support for dynamically changing the background drawable #44

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27 changes: 20 additions & 7 deletions library/src/com/manuelpeinado/fadingactionbar/FadingActionBarHelperBase.java
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Original file line number Diff line number Diff line change
Expand Up @@ -170,12 +170,22 @@ public void initActionBar(Activity activity) {
if (mActionBarBackgroundDrawable == null) {
mActionBarBackgroundDrawable = activity.getResources().getDrawable(mActionBarBackgroundResId);
}
setActionBarBackgroundDrawable(mActionBarBackgroundDrawable);
applyBackgroundDrawable();
mActionBarBackgroundDrawable.setAlpha(0);
}

public void setActionBarBackground(Drawable background) {
mActionBarBackgroundDrawable = background;
applyBackgroundDrawable();
setAlpha(mLastScrollPosition);
}

private void applyBackgroundDrawable() {
setActionBarBackgroundDrawable(mActionBarBackgroundDrawable);
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN) {
mActionBarBackgroundDrawable.setCallback(mDrawableCallback);
}
mActionBarBackgroundDrawable.setAlpha(0);
}
}

protected abstract int getActionBarHeight();
protected abstract boolean isActionBarNull();
Expand Down Expand Up @@ -305,8 +315,13 @@ private void onNewScroll(int scrollPosition) {
if (isActionBarNull()) {
return;
}

setAlpha(scrollPosition);
addParallaxEffect(scrollPosition);
}

int currentHeaderHeight = mHeaderContainer.getHeight();
private void setAlpha(int scrollPosition) {
int currentHeaderHeight = mHeaderContainer.getHeight();
if (currentHeaderHeight != mLastHeaderHeight) {
updateHeaderHeight(currentHeaderHeight);
}
Expand All @@ -315,9 +330,7 @@ private void onNewScroll(int scrollPosition) {
float ratio = (float) Math.min(Math.max(scrollPosition, 0), headerHeight) / headerHeight;
int newAlpha = (int) (ratio * 255);
mActionBarBackgroundDrawable.setAlpha(newAlpha);

addParallaxEffect(scrollPosition);
}
}

private void addParallaxEffect(int scrollPosition) {
float damping = mUseParallax ? 0.5f : 1.0f;
Expand Down