htmltreerenderer.java

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

        {
            HtmlTreeNode child = (HtmlTreeNode) it.next();

            if (!child.isRendered())
            {
                continue;
            }
            HtmlRendererUtils.writePrettyLineSeparator(facesContext);

            writer.startElement(HTML.TR_ELEM, null);

            if (rowClassIndex < rowClassesCount)
            {
                writer.writeAttribute(HTML.CLASS_ATTR, rowClassesArray[rowClassIndex], null);
            }
            if (rowClassesCount > 0)
            {
                rowClassIndex++;
                rowClassIndex = rowClassIndex % rowClassesCount;
            }

            if (null != tree.getVar())
            {
                facesContext.getExternalContext().getSessionMap().put(tree.getVar(),
                        ((TreeNode) child.getUserObject()).getUserObject());
            }

            List componentChildren = tree.getChildren();
            if ((null != componentChildren) && (componentChildren.size() > 0))
            {
                for (int j = 0, size = tree.getChildCount(); j < size; j++)
                {
                    UIComponent componentChild = (UIComponent) componentChildren.get(j);
                    if ((componentChild.getFamily().equals(UIColumn.COMPONENT_FAMILY))
                            && ((UIColumn) componentChild).isRendered())
                    {
                        writer.startElement(HTML.TD_ELEM, tree);
                        if (columnClassIndex < columnClassesCount)
                        {
                            writer.writeAttribute(HTML.CLASS_ATTR, columnClassesArray[columnClassIndex], null);
                        }
                        if (columnClassesCount > 0)
                        {
                            columnClassIndex++;
                            columnClassIndex = columnClassIndex % columnClassesCount;
                        }
                        RendererUtils.renderChild(facesContext, componentChild);
                        writer.endElement(HTML.TD_ELEM);
                    }
                    else if ((componentChild.getFamily().equals(HtmlTreeColumn.COMPONENT_FAMILY))
                            && ((HtmlTreeColumn) componentChild).isRendered())
                    {
                        renderTreeColumnChild(facesContext, writer, componentChild, tree, child, maxLevel, iconProvider);
                    }
                }
            }
            else
            {
                renderTreeColumnChild(facesContext, writer, null, tree, child, maxLevel, iconProvider);
            }

            writer.endElement(HTML.TR_ELEM);

            if (child.getChildCount() > 0)
            {
                renderChildren(facesContext, writer, tree, child.getChildren(), maxLevel, iconProvider, rowClassIndex);
                if (rowClassesCount > 0)
                {
                    rowClassIndex += (child.getChildCount() % rowClassesCount);
                    rowClassIndex = rowClassIndex % rowClassesCount;
                }
            }
        }
    }

    /**
     * <p>
     * Render the column where the tree is displayed.
     * </p>
     *
     * @param facesContext The facesContext.
     * @param writer The writer.
     * @param component The component that will contain the tree. Null for
     *            default tree or {@link HtmlTreeColumn}for table rendering.
     * @param tree The tree,
     * @param child The tree node child.
     * @param maxLevel The max number of levels.
     * @param iconProvider The iconProvider.
     * @throws IOException Throws IOException.
     */
    protected void renderTreeColumnChild(FacesContext facesContext, ResponseWriter writer, UIComponent component,
            HtmlTree tree, HtmlTreeNode child, int maxLevel, IconProvider iconProvider) throws IOException
    {
        String iconClass = tree.getIconClass();
        int[] layout = child.getLayout();
        // tree lines
        for (int i = 0; i < layout.length - 1; i++)
        {
            int state = layout[i];
            writer.startElement(HTML.TD_ELEM, null);
            String url = getLayoutImage(tree, state);

            if ((url != null) && (url.length() > 0))
            {
                //writer.startElement(HTML.IMG_ELEM, child);

                //String src;
                //if (url.startsWith(HTML.HREF_PATH_SEPARATOR))
                //{
                //    String path = facesContext.getExternalContext().getRequestContextPath();
                //    src = path + url;
                //}
                //else
                //{
                //    src = url;
                //}
                //Encode URL
                //Although this is an url url, encodeURL is no nonsense,
                // because the
                //actual url url could also be a dynamic servlet request:
                //src = facesContext.getExternalContext().encodeResourceURL(src);
                //writer.writeAttribute(HTML.SRC_ATTR, src, null);
                //writer.writeAttribute(HTML.BORDER_ATTR, ZERO, null);

                //HtmlRendererUtils.renderHTMLAttributes(writer, child, HTML.IMG_PASSTHROUGH_ATTRIBUTES);

                //writer.endElement(HTML.IMG_ELEM);
                writeImageElement(url, facesContext, writer, child);
            }
            writer.endElement(HTML.TD_ELEM);

        }

        // command link
        writer.startElement(HTML.TD_ELEM, null);
        int state = layout[layout.length - 1];
        String url = getLayoutImage(tree, state);

        if (state == HtmlTreeNode.CHILD || state == HtmlTreeNode.CHILD_FIRST || state == HtmlTreeNode.CHILD_LAST)
        {
            // no action, just img
            writeImageElement(url, facesContext, writer, child);
        }
        else
        {
            HtmlTreeImageCommandLink expandCollapse = (HtmlTreeImageCommandLink) child
                    .getExpandCollapseCommand(facesContext);
            expandCollapse.setImage(getLayoutImage(tree, layout[layout.length - 1]));

            expandCollapse.encodeBegin(facesContext);
            expandCollapse.encodeEnd(facesContext);
        }
        writer.endElement(HTML.TD_ELEM);

        int labelColSpan = maxLevel - child.getLevel() + 1;

        // node icon
        if (iconProvider != null)
        {
            url = iconProvider.getIconUrl(child.getUserObject(), child.getChildCount(), child.isLeaf(facesContext));
        }
        else
        {
            if (!child.isLeaf(facesContext))
            {
                // todo: icon provider
                url = HtmlTree.getDefaultImagePath( DEFAULT_IMAGE_ICON_FOLDER );
            }
            else
            {
                url = null;
            }
        }

        if ((url != null) && (url.length() > 0))
        {
            writer.startElement(HTML.TD_ELEM, null);
            if (iconClass != null)
            {
                writer.writeAttribute(HTML.CLASS_ATTR, iconClass, null);
            }
            writeImageElement(url, facesContext, writer, child);
            writer.endElement(HTML.TD_ELEM);
        }
        else
        {
            // no icon, so label has more room
            labelColSpan++;
        }

        // node label
        writer.startElement(HTML.TD_ELEM, null);
        writer.writeAttribute(HTML.COLSPAN_ATTR, new Integer(labelColSpan), null);
        if (child.isSelected() && tree.getSelectedNodeClass() != null)
        {
            writer.writeAttribute(HTML.CLASS_ATTR, tree.getSelectedNodeClass(), null);
        }
        else if (!child.isSelected() && tree.getNodeClass() != null)
        {
            writer.writeAttribute(HTML.CLASS_ATTR, tree.getNodeClass(), null);
        }

        List componentChildren = null;
        if (null != component)
        {
            componentChildren = component.getChildren();
        }
        if ((null != componentChildren) && (componentChildren.size() > 0))
        {
            for (int k = 0; k < componentChildren.size(); k++)
            {
                UIComponent componentChild = (UIComponent) componentChildren.get(k);
                RendererUtils.renderChild(facesContext, componentChild);
            }
        }
        else
        {
            child.encodeBegin(facesContext);
            child.encodeEnd(facesContext);
        }
        writer.endElement(HTML.TD_ELEM);
    }

    private void writeImageElement(String url, FacesContext facesContext, ResponseWriter writer, HtmlTreeNode child)
            throws IOException
    {
        writer.startElement(HTML.IMG_ELEM, child);
        String src = facesContext.getApplication().getViewHandler().getResourceURL(facesContext, url);
        //        if (url.startsWith(HTML.HREF_PATH_SEPARATOR))
        //        {
        //            String path =
        // facesContext.getExternalContext().getRequestContextPath();
        //            src = path + url;
        //        } else
        //        {
        //            src = url;
        //        }
        //        //Encode URL
        //        src = facesContext.getExternalContext().encodeResourceURL(src);
        writer.writeAttribute(HTML.SRC_ATTR, src, null);
        writer.writeAttribute(HTML.BORDER_ATTR, ZERO, null);

        HtmlRendererUtils.renderHTMLAttributes(writer, child, HTML.IMG_PASSTHROUGH_ATTRIBUTES);

        writer.endElement(HTML.IMG_ELEM);
    }

    protected String getLayoutImage(HtmlTree tree, int state)
    {
        switch (state)
        {
        case HtmlTreeNode.OPEN:
            return tree.getIconNodeOpenMiddle();
        case HtmlTreeNode.OPEN_FIRST:
            return tree.getIconNodeOpenFirst();
        case HtmlTreeNode.OPEN_LAST:
            return tree.getIconNodeOpenLast();
        case HtmlTreeNode.OPEN_SINGLE:
            return tree.getIconNodeOpen();
        case HtmlTreeNode.CLOSED:
            return tree.getIconNodeCloseMiddle();
        case HtmlTreeNode.CLOSED_FIRST:
            return tree.getIconNodeCloseFirst();
        case HtmlTreeNode.CLOSED_LAST:
            return tree.getIconNodeCloseLast();
        case HtmlTreeNode.CLOSED_SINGLE:
            return tree.getIconNodeClose();
        case HtmlTreeNode.CHILD:
            return tree.getIconChildMiddle();
        case HtmlTreeNode.CHILD_FIRST:
            return tree.getIconChildFirst();
        case HtmlTreeNode.CHILD_LAST:
            return tree.getIconChildLast();
        case HtmlTreeNode.LINE:
            return tree.getIconLine();
        case HtmlTreeNode.EMPTY:
            return tree.getIconNoline();
        default:
            return tree.getIconNoline();
        }
    }
}