public void onViewPagerPageChanged() {
scrollDown(lastYOffset);
View visibleView = getTheVisibileView(scrollViewList);
if (!canScroll(visibleView)) {
followScrollToolbarLayout(0);
onMaterialScrolled(visibleView, 0);
}
}
/**
* Called when a scroller(RecyclerView/ListView,ScrollView,WebView) scrolled by the user
*
* @param source the scroller
* @param yOffset the scroller current yOffset
*/
public boolean onMaterialScrolled(Object source, float yOffset) {
if (initialDistance == -1 || initialDistance == 0) {
initialDistance = mHeader.mPagerSlidingTabStrip.getTop() - mHeader.toolbar.getBottom();
}
// only if yOffset changed
if (yOffset == lastYOffset) return false;
float scrollTop = -yOffset;
{
// parallax scroll of the Background ImageView (the KenBurnsView)
if (mHeader.headerBackground != null) {
if (this.settings.parallaxHeaderFactor != 0)
ViewHelper.setTranslationY(
mHeader.headerBackground, scrollTop / this.settings.parallaxHeaderFactor);
if (ViewHelper.getY(mHeader.headerBackground) >= 0)
ViewHelper.setY(mHeader.headerBackground, 0);
}
}
if (ENABLE_LOG) Log.d("yOffset", "" + yOffset);
// dispatch the new offset to all registered scrollables
dispatchScrollOffset(source, minMax(0, yOffset, scrollMaxDp));
float percent = yOffset / scrollMax;
if (ENABLE_LOG) Log.d("percent1", "" + percent);
if (percent != 0) {
// distance between pager & toolbar
float newDistance =
ViewHelper.getY(mHeader.mPagerSlidingTabStrip) - mHeader.toolbar.getBottom();
percent = 1 - newDistance / initialDistance;
if (ENABLE_LOG) Log.d("percent2", "" + percent);
}
if (Float.isNaN(percent)) // fix for orientation change
return false;
// fix quick scroll
if (percent == 0 && headerAnimator != null) {
cancelHeaderAnimator();
ViewHelper.setTranslationY(mHeader.toolbarLayout, 0);
}
percent = minMax(0, percent, 1);
{
if (!settings.toolbarTransparent) {
// change color of toolbar & viewpager indicator & statusBaground
setColorPercent(percent);
} else {
if (justToolbarAnimated) {
if (toolbarJoinsTabs()) setColorPercent(1);
else if (lastPercent != percent) {
animateColorPercent(0, 200);
}
}
}
lastPercent = percent; // save the percent
if (mHeader.mPagerSlidingTabStrip != null) { // move the viewpager indicator
// float newY = ViewHelper.getY(mHeader.mPagerSlidingTabStrip) + scrollTop;
if (ENABLE_LOG) Log.d(TAG, "" + scrollTop);
// mHeader.mPagerSlidingTabStrip.setTranslationY(mHeader.getToolbar().getBottom()-mHeader.mPagerSlidingTabStrip.getY());
if (scrollTop <= 0) {
ViewHelper.setTranslationY(mHeader.mPagerSlidingTabStrip, scrollTop);
ViewHelper.setTranslationY(mHeader.toolbarLayoutBackground, scrollTop);
// when
if (ViewHelper.getY(mHeader.mPagerSlidingTabStrip) < mHeader.getToolbar().getBottom()) {
float ty = mHeader.getToolbar().getBottom() - mHeader.mPagerSlidingTabStrip.getTop();
ViewHelper.setTranslationY(mHeader.mPagerSlidingTabStrip, ty);
ViewHelper.setTranslationY(mHeader.toolbarLayoutBackground, ty);
}
}
}
if (mHeader.mLogo != null) { // move the header logo to toolbar
if (this.settings.hideLogoWithFade) {
ViewHelper.setAlpha(mHeader.mLogo, 1 - percent);
ViewHelper.setTranslationY(
mHeader.mLogo, (mHeader.finalTitleY - mHeader.originalTitleY) * percent);
} else {
ViewHelper.setTranslationY(
mHeader.mLogo, (mHeader.finalTitleY - mHeader.originalTitleY) * percent);
ViewHelper.setTranslationX(
mHeader.mLogo, (mHeader.finalTitleX - mHeader.originalTitleX) * percent);
float scale = (1 - percent) * (1 - mHeader.finalScale) + mHeader.finalScale;
setScale(scale, mHeader.mLogo);
}
}
if (this.settings.hideToolbarAndTitle && mHeader.toolbarLayout != null) {
boolean scrollUp = lastYOffset < yOffset;
if (scrollUp) {
scrollUp(yOffset);
} else {
scrollDown(yOffset);
}
}
}
if (headerAnimator != null && percent < 1) {
cancelHeaderAnimator();
}
lastYOffset = yOffset;
return true;
}