private void initPostion() {
if (pns == null) {
pns = new ArrayList<PositionNav>();
}
NodeList<Node> nodes = content.getChildNodes();
for (int i = 1; i < nodes.getLength(); i = i + 2) {
Element elm = nodes.getItem(i).<Element>cast();
final int absoluteTop = elm.getAbsoluteTop() - OFFSET;
LIElement li = Document.get().createLIElement().cast();
li.setInnerHTML(elm.getId());
EventGenerator.onClick(
li,
new Function() {
@Override
public void f(Event e) {
root.getElement().setScrollTop(absoluteTop);
}
});
ul.appendChild(li);
pns.add(new PositionNav(absoluteTop, li));
}
currentli = pns.get(0).getElm();
currentli.addClassName(style.active());
}
@Override
protected void start() {
root.add(loginBar);
goTop.addStyleName(style.gotop());
goTop.addDomHandler(
new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
root.getElement().setScrollTop(0);
}
},
ClickEvent.getType());
gotoTask =
new DelayedTask() {
@Override
public void onExecute() {
if (!gotoShowing && scrollTop >= 800) {
goTop.addStyleName(style.gotopshow());
gotoShowing = true;
} else if (scrollTop < 800 && gotoShowing) {
goTop.removeStyleName(style.gotopshow());
gotoShowing = false;
}
}
};
navTask =
new DelayedTask() {
@Override
public void onExecute() {
if (scrollTop >= navMix && scrollTop <= navMax) {
return;
}
currentli.removeClassName(style.active());
int i = 0;
while (i < pns.size()) {
PositionNav nav = pns.get(i);
navMix = nav.getScrollTop() - OFFSET;
navMax =
((i == (pns.size() - 1))
? root.getElement().getScrollHeight()
: pns.get(i + 1).getScrollTop())
- OFFSET;
if (scrollTop >= navMix && scrollTop <= navMax) {
currentli = nav.getElm();
break;
}
i++;
}
currentli.addClassName(style.active());
}
};
initPostion();
root.addDomHandler(
new ScrollHandler() {
@Override
public void onScroll(ScrollEvent event) {
scrollTop = event.getRelativeElement().getScrollTop();
gotoTask.delay(100);
navTask.delay(30);
}
},
ScrollEvent.getType());
}