Examples of org.zkoss.zul.ext.Paginal

org.zkoss.zul.ext.Paginal
Represents a component that is used to control how to display other components in multiple pages. In other words, it represents a paging controller.
It is used to provide an abstract contract between controller and controllee. For example, {@link org.zkoss.zul.Paging} is a paging controllerwhile {@link org.zkoss.zul.Grid} is a paging controllee.In other words, {@link org.zkoss.zul.Grid} (contains long content)can be controlled by {@link org.zkoss.zul.Paging}.
The paging controller must implement this interface, while the paging controllee shall access only this interface (rather than {@link org.zkoss.zul.Paging} or so).
Note: If a component supports multiple pages but it cannot be controlled by a paging controller, it shall implement {@link Pageable} instead.Example, {@link org.zkoss.zul.Treechildren}is {@link Pageable} but not controllable by {@link Paginal}.
- {@link Paginated}: a multi-page component whose pagination is controlled by an external page controlle ( {@link Paginal}).
- {@link Paginal}: the paging controller used to control the pagination of {@link Paginated}.
- {@link Pageable}: a multi-page component that handles pagination by itself.
@author tomyeh @see Paginated

   */
  public void setActivePage(Treeitem item) {
    if (item.isVisible() && item.getTree() == this && isVisible()) {
      int index = getVisibleIndexOfItem(item);
      if (index != -1) {
        final Paginal pgi = getPaginal();
        int pg = index / pgi.getPageSize();
        if (pg != getActivePage())
          setActivePage(pg);
      }
        
    }

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              (Treeitem)selItems.iterator().next(): null;
          selectItem(item);
        } else {
          int from, to;
          if (paging) {
            final Paginal pgi = getPaginal();
            int pgsz = pgi.getPageSize();
            from = pgi.getActivePage() * pgsz;
            to = from + pgsz; //excluded
          } else {
            from = to = 0;
          }

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    if (count != 0) {
      _visibleItemCount += count;
      final Grid grid = getGrid();
      if (grid != null) {
        if (grid.inPagingMold()) {
          final Paginal pgi = grid.getPaginal();
          pgi.setTotalSize(grid.getDataLoader().getTotalSize());
          if (grid.getModel() != null)
            grid.invalidate();
          else {
            invalidate();
            grid.getDataLoader().updateModelInfo();

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      if (_count >= _grid.getPaginal().getPageSize()) {
        return false;
      }


      if (_count == 0) {
        final Paginal pgi = _grid.getPaginal();
        int begin = pgi.getActivePage() * pgi.getPageSize();
        for (int i = 0; i < begin && _it.hasNext();) {
          getVisibleRow((Row)_it.next());
          i++;
        }
      }

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