htmldatascrollerrenderer.java

一个使用struts+hibernate+spring开发的完的网站源代码。

            writer.startElement("td", scroller);
            renderFacet(facesContext, scroller, facetComp, FACET_FIRST);
            writer.endElement("td");
        }
        facetComp = scroller.getFastRewind();
        if (facetComp != null)
        {
            writer.startElement("td", scroller);
            renderFacet(facesContext, scroller, facetComp, FACET_FAST_REWIND);
            writer.endElement("td");
        }
        facetComp = scroller.getPrevious();
        if (facetComp != null)
        {
            writer.startElement("td", scroller);
            renderFacet(facesContext, scroller, facetComp, FACET_PREVOIUS);
            writer.endElement("td");
        }
        if (scroller.isPaginator())
        {
            writer.startElement("td", scroller);
            renderPaginator(facesContext, scroller, uiData);
            writer.endElement("td");
        }
        facetComp = scroller.getNext();
        if (facetComp != null)
        {
            writer.startElement("td", scroller);
            renderFacet(facesContext, scroller, facetComp, FACET_NEXT);
            writer.endElement("td");
        }
        facetComp = scroller.getFastForward();
        if (facetComp != null)
        {
            writer.startElement("td", scroller);
            renderFacet(facesContext, scroller, facetComp, FACET_FAST_FORWARD);
            writer.endElement("td");
        }
        facetComp = scroller.getLast();
        if (facetComp != null)
        {
            writer.startElement("td", scroller);
            renderFacet(facesContext, scroller, facetComp, FACET_LAST);
            writer.endElement("td");
        }

        writer.endElement("tr");
        writer.endElement("table");
    }

    private void renderFacet(FacesContext facesContext,
                             HtmlDataScroller scroller,
                             UIComponent facetComp,
                             String facetName)
        throws IOException
    {
        UIComponent link = getLink(facesContext, scroller, facetComp, facetName);
        link.encodeBegin(facesContext);
        facetComp.encodeBegin(facesContext);
        if (facetComp.getRendersChildren())
            facetComp.encodeChildren(facesContext);
        facetComp.encodeEnd(facesContext);
        link.encodeEnd(facesContext);
    }
    
    protected void renderPaginator(FacesContext facesContext,
                                   HtmlDataScroller scroller,
                                   UIData uiData)
        throws IOException
    {
        ResponseWriter writer = facesContext.getResponseWriter();

        int maxPages = scroller.getPaginatorMaxPages();
        if (maxPages <= 1)
        {
            maxPages = 2;
        }
        int pageCount = getPageCount(uiData);
        if (pageCount <= 1)
        {
            return;
        }
        int pageIndex = getPageIndex(uiData);
        int delta = maxPages / 2;

        int pages;
        int start;
        if (pageCount > maxPages && pageIndex > delta)
        {
            pages = maxPages;
            start = pageIndex - pages / 2 - 1;
            if (start + pages > pageCount)
            {
                start = pageCount - pages;
            }
        }
        else
        {
            pages = pageCount < maxPages ? pageCount : maxPages;
            start = 0;
        }

        writer.startElement("table", scroller);

        String styleClass = scroller.getPaginatorTableClass();
        if (styleClass != null)
        {
            writer.writeAttribute("class", styleClass, null);
        }
        String style = scroller.getPaginatorTableStyle();
        if (style != null)
        {
            writer.writeAttribute("style", style, null);
        }

        writer.startElement("tr", scroller);

        for (int i = start, size = start + pages; i < size; i++)
        {
            int idx = i + 1;
            writer.startElement("td", scroller);
            String cStyleClass;
            String cStyle;
            if (idx == pageIndex)
            {
                cStyleClass = scroller.getPaginatorActiveColumnClass();
                cStyle = scroller.getPaginatorActiveColumnStyle();
            }
            else
            {
                cStyleClass = scroller.getPaginatorColumnClass();
                cStyle = scroller.getPaginatorColumnStyle();
            }
            if (cStyleClass != null)
            {
                writer.writeAttribute("class", cStyleClass, null);
            }
            if (cStyle != null)
            {
                writer.writeAttribute("style", cStyle, null);
            }

            HtmlCommandLink link = getLink(facesContext, scroller, Integer.toString(idx), idx);
            link.encodeBegin(facesContext);
            link.encodeChildren(facesContext);
            link.encodeEnd(facesContext);

            writer.endElement("td");
        }

        writer.endElement("tr");
        writer.endElement("table");
    }

    protected HtmlCommandLink getLink(FacesContext facesContext,
                                      HtmlDataScroller scroller,
                                      String text,
                                      int pageIndex)
    {
        String id = PAGE_NAVIGATION + Integer.toString(pageIndex);
        Application application = facesContext.getApplication();

        HtmlCommandLink link =
            (HtmlCommandLink)application.createComponent(HtmlCommandLink.COMPONENT_TYPE);
        link.setId(scroller.getId() + id);
        link.setTransient(true);
        UIParameter parameter
            = (UIParameter)application.createComponent(UIParameter.COMPONENT_TYPE);
        parameter.setId(scroller.getId() + id + "_param");
        parameter.setTransient(true);
        parameter.setName(scroller.getClientId(facesContext));
        parameter.setValue(id);
        List children = link.getChildren();
        children.add(parameter);
        if (text != null)
        {
            HtmlOutputText uiText =
                (HtmlOutputText)application.createComponent(HtmlOutputText.COMPONENT_TYPE);
            uiText.setTransient(true);
            uiText.setValue(text);
            children.add(uiText);
        }
        scroller.getChildren().add(link);
        return link;
    }

    protected HtmlCommandLink getLink(FacesContext facesContext,
                                      HtmlDataScroller scroller,
                                      UIComponent facetComp,
                                      String facetName)
    {
        Application application = facesContext.getApplication();

        HtmlCommandLink link
                = (HtmlCommandLink)application.createComponent(HtmlCommandLink.COMPONENT_TYPE);
        link.setId(scroller.getId() + facetName);
        link.setTransient(true);
        UIParameter parameter
                = (UIParameter)application.createComponent(UIParameter.COMPONENT_TYPE);
        parameter.setId(scroller.getId() + facetName + "_param");
        parameter.setTransient(true);
        parameter.setName(scroller.getClientId(facesContext));
        parameter.setValue(facetName);
        List children = link.getChildren();
        children.add(parameter);
        if (facetComp != null)
            children.add(facetComp);
        // dirty, cause facet-comp is now child from link & scroller!
        scroller.getChildren().add(link);
        return link;
    }

    protected int getPageIndex(UIData uiData)
    {
        int rows = uiData.getRows();
        int pageIndex;
        if (rows > 0)
        {
            pageIndex = uiData.getFirst() / rows + 1;
        }
        else
        {
            log.warn("DataTable " + uiData.getClientId(FacesContext.getCurrentInstance()) + " has invalid rows attribute.");
            pageIndex = 0;
        }
        if (uiData.getFirst() % rows > 0)
        {
            pageIndex++;
        }
        return pageIndex;
    }

    protected int getPageCount(UIData uiData)
    {
        int rows = uiData.getRows();
        int pageCount;
        if (rows > 0)
        {
            pageCount = rows <= 0 ? 1 : uiData.getRowCount() / rows;
            if (uiData.getRowCount() % rows > 0)
            {
                pageCount++;
            }
        }
        else
        {
            rows = 1;
            pageCount = 1;
        }
        return pageCount;
    }

    protected UIData findUIData(HtmlDataScroller scroller, UIComponent component)
    {
        String forStr = scroller.getFor();
        UIComponent forComp;
        if (forStr == null)
        {
            // DataScroller may be a child of uiData
            forComp = component.getParent();
        }
        else
        {
            forComp = component.findComponent(scroller.getFor());
            if (forComp == null)
            {
                log.warn("could not find UIData referenced by attribute dataScroller@for = '" + scroller.getFor() + "'");
            }
        }
        if (!(forComp instanceof UIData))
        {
            throw new IllegalArgumentException("uiComponent referenced by attribute tableScroller@for must be of type " + UIData.class.getName());
        }
        return (UIData)forComp;
    }

}