Exemplo n.º 1
0
 private Element getTabBarElement() {
   return (Element)
       DomUtils.findNode(
           getElement(),
           true,
           false,
           new NodePredicate() {
             public boolean test(Node n) {
               if (n.getNodeType() != Node.ELEMENT_NODE) return false;
               return ((Element) n).getClassName().contains("gwt-TabLayoutPanelTabs");
             }
           });
 }
Exemplo n.º 2
0
  public void ensureSelectedTabIsVisible(boolean animate) {
    if (currentAnimation_ != null) {
      currentAnimation_.cancel();
      currentAnimation_ = null;
    }

    Element selectedTab =
        (Element)
            DomUtils.findNode(
                getElement(),
                true,
                false,
                new NodePredicate() {
                  public boolean test(Node n) {
                    if (n.getNodeType() != Node.ELEMENT_NODE) return false;
                    return ((Element) n).getClassName().contains("gwt-TabLayoutPanelTab-selected");
                  }
                });
    if (selectedTab == null) {
      return;
    }
    selectedTab = selectedTab.getFirstChildElement().getFirstChildElement();

    Element tabBar = getTabBarElement();

    if (!isVisible() || !isAttached() || tabBar.getOffsetWidth() == 0) return; // not yet loaded

    final Element tabBarParent = tabBar.getParentElement();

    final int start = tabBarParent.getScrollLeft();
    int end =
        DomUtils.ensureVisibleHoriz(
            tabBarParent, selectedTab, padding_, padding_ + rightMargin_, true);

    // When tabs are closed, the overall width shrinks, and this can lead
    // to cases where there's too much empty space on the screen
    Node lastTab = getLastChildElement(tabBar);
    if (lastTab == null || lastTab.getNodeType() != Node.ELEMENT_NODE) return;
    int edge =
        DomUtils.getRelativePosition(tabBarParent, Element.as(lastTab)).x
            + Element.as(lastTab).getOffsetWidth();
    end = Math.min(end, Math.max(0, edge - (tabBarParent.getOffsetWidth() - rightMargin_)));

    if (edge <= tabBarParent.getOffsetWidth() - rightMargin_) end = 0;

    if (start != end) {
      if (!animate) {
        tabBarParent.setScrollLeft(end);
      } else {
        final int finalEnd = end;
        currentAnimation_ =
            new Animation() {
              @Override
              protected void onUpdate(double progress) {
                double delta = (finalEnd - start) * progress;
                tabBarParent.setScrollLeft((int) (start + delta));
              }

              @Override
              protected void onComplete() {
                if (this == currentAnimation_) {
                  tabBarParent.setScrollLeft(finalEnd);
                  currentAnimation_ = null;
                }
              }
            };
        currentAnimation_.run(Math.max(200, Math.min(1500, Math.abs(end - start) * 2)));
      }
    }
  }