/src/main/java/org/primefaces/component/panelgrid/PanelGridRenderer.java

/*

 * Copyright 2009-2014 PrimeTek.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package org.primefaces.component.panelgrid;



import java.io.IOException;

import javax.faces.FacesException;

import javax.faces.component.UIComponent;

import javax.faces.component.UIPanel;

import javax.faces.context.FacesContext;

import javax.faces.context.ResponseWriter;

import org.primefaces.component.column.Column;

import org.primefaces.component.row.Row;

import org.primefaces.renderkit.CoreRenderer;

import org.primefaces.util.Constants;

import org.primefaces.util.GridLayoutUtils;



public class PanelGridRenderer extends CoreRenderer {

    

    @Override

    public void encodeEnd(FacesContext context, UIComponent component) throws IOException {

        PanelGrid grid = (PanelGrid) component;

        

        if(grid.getLayout().equals("tabular")) {

            encodeTableLayout(context, grid);

        }

        else if(grid.getLayout().equals("grid")){     

            encodeGridLayout(context, grid);

        }

        else {

            throw new FacesException("The value of 'layout' attribute must be 'grid' or 'tabular'. Default value is 'tabular'.");

        }   

    }

    

    public void encodeTableLayout(FacesContext context, PanelGrid grid) throws IOException {

        ResponseWriter writer = context.getResponseWriter();

        String clientId = grid.getClientId(context);

        int columns = grid.getColumns();

        String style = grid.getStyle();

        String styleClass = grid.getStyleClass();

        styleClass = styleClass == null ? PanelGrid.CONTAINER_CLASS : PanelGrid.CONTAINER_CLASS + " " + styleClass;

                

        writer.startElement("table", grid);

        writer.writeAttribute("id", clientId, "id");

        writer.writeAttribute("class", styleClass, "styleClass");

        if(style != null) {

            writer.writeAttribute("style", style, "style");

        }

        writer.writeAttribute("role", "grid", null);

                

        encodeTableFacet(context, grid, columns, "header", "thead", PanelGrid.HEADER_CLASS);

        encodeTableFacet(context, grid, columns, "footer", "tfoot", PanelGrid.FOOTER_CLASS);

        encodeTableBody(context, grid, columns);

        

        writer.endElement("table");

    }

    

    public void encodeGridLayout(FacesContext context, PanelGrid grid) throws IOException {

        ResponseWriter writer = context.getResponseWriter();

        String clientId = grid.getClientId(context);

        int columns = grid.getColumns();

        if(columns == 0) {

            throw new FacesException("Columns of PanelGrid \"" + grid.getClientId(context) + "\" must be greater than zero in grid layout.");

        }

                

        String style = grid.getStyle();

        String styleClass = grid.getStyleClass();

        styleClass = styleClass == null ? PanelGrid.CONTAINER_CLASS : PanelGrid.CONTAINER_CLASS + " " + styleClass;

        

        writer.startElement("div", grid);

        writer.writeAttribute("id", clientId, "id");

        writer.writeAttribute("class", styleClass, "styleClass");

        if(style != null) {

            writer.writeAttribute("style", style, "style");

        }



        encodeGridFacet(context, grid, columns, "header", PanelGrid.HEADER_CLASS);

        encodeGridBody(context, grid, columns);

        encodeGridFacet(context, grid, columns, "footer", PanelGrid.FOOTER_CLASS);

   

        writer.endElement("div");

    }

    

    public void encodeTableBody(FacesContext context, PanelGrid grid, int columns) throws IOException {

        ResponseWriter writer = context.getResponseWriter();

        

        writer.startElement("tbody", grid);

        

        if(columns > 0)

            encodeDynamicBody(context, grid, grid.getColumns());

        else

            encodeStaticBody(context, grid);



        writer.endElement("tbody");

    }

    

    public void encodeDynamicBody(FacesContext context, PanelGrid grid, int columns) throws IOException {

        ResponseWriter writer = context.getResponseWriter();

        String columnClassesValue = grid.getColumnClasses();

        String[] columnClasses = columnClassesValue == null ? new String[0] : columnClassesValue.split(",");

        

        int i = 0;

        for(UIComponent child : grid.getChildren()) {

            if(!child.isRendered()) {

                continue;

            }

            

            int colMod = i % columns;

            if(colMod == 0) {

                writer.startElement("tr", null);

                writer.writeAttribute("class", PanelGrid.TABLE_ROW_CLASS, null);

                writer.writeAttribute("role", "row", null);

            }

            

            String columnClass = (colMod < columnClasses.length) ? PanelGrid.CELL_CLASS + " " + columnClasses[colMod].trim() : PanelGrid.CELL_CLASS;

            writer.startElement("td", null);

            writer.writeAttribute("role", "gridcell", null);

            writer.writeAttribute("class", columnClass, null);

            child.encodeAll(context);

            writer.endElement("td");



            i++;

            colMod = i % columns;

            

            if(colMod == 0) {

                writer.endElement("tr");

            }

        }

    }

    

    public void encodeStaticBody(FacesContext context, PanelGrid grid) throws IOException {

        context.getAttributes().put(Constants.HELPER_RENDERER, "panelGridBody");

        int i=0;

        

        for(UIComponent child : grid.getChildren()) {            

            if(child.isRendered()) {

                if(child instanceof Row) {

                    String rowStyleClass = i % 2 == 0 ? PanelGrid.TABLE_ROW_CLASS + " " + PanelGrid.EVEN_ROW_CLASS : PanelGrid.TABLE_ROW_CLASS + " " + PanelGrid.ODD_ROW_CLASS;

                    encodeRow(context, (Row) child, "gridcell", rowStyleClass, PanelGrid.CELL_CLASS);

                    i++;

                } 

                else {                   

                    child.encodeAll(context);

                }

            }

        }      

        

        context.getAttributes().remove(Constants.HELPER_RENDERER);

    }

    

    public void encodeRow(FacesContext context, Row row, String columnRole, String rowClass, String columnClass) throws IOException {

        ResponseWriter writer = context.getResponseWriter();

        String style = row.getStyle();

        

        writer.startElement("tr", null);

        if(shouldWriteId(row)) {

            writer.writeAttribute("id", row.getClientId(context), null);

        }

        if(row.getStyleClass() != null) {

            rowClass += " " + row.getStyleClass();

        }

        if(style != null) writer.writeAttribute("style", style, null);

        

        writer.writeAttribute("class", rowClass, null);

        writer.writeAttribute("role", "row", null);

        

        for(UIComponent child : row.getChildren()) {

            if(child instanceof Column && child.isRendered()) {

                Column column = (Column) child;

                String userStyleClass = column.getStyleClass();

                String styleClass = (userStyleClass == null) ? columnClass : columnClass + " " + userStyleClass;

                                

                writer.startElement("td", null);

                if(shouldWriteId(column)) {

                    writer.writeAttribute("id", column.getClientId(context), null);

                }

                writer.writeAttribute("role", columnRole, null);

                writer.writeAttribute("class", styleClass, null);

                

                if(column.getStyle() != null) writer.writeAttribute("style", column.getStyle(), null);

                if(column.getColspan() > 1) writer.writeAttribute("colspan", column.getColspan(), null);

                if(column.getRowspan() > 1) writer.writeAttribute("rowspan", column.getRowspan(), null);

                

                renderChildren(context, column);

                

                writer.endElement("td");

            }

        }

        

        writer.endElement("tr");

    }

    

    public void encodeGridBody(FacesContext context, PanelGrid grid, int columns) throws IOException {

        String clientId = grid.getClientId(context);

        ResponseWriter writer = context.getResponseWriter();

        String columnClassesValue = grid.getColumnClasses();

        String[] columnClasses = columnClassesValue == null ? new String[0] : columnClassesValue.split(",");

        

        writer.startElement("div", grid);

        writer.writeAttribute("id", clientId + "_content", null);

        writer.writeAttribute("class", PanelGrid.CONTENT_CLASS, null);

        

        int i = 0;

        for(UIComponent child : grid.getChildren()) {

            if(!child.isRendered()) {

                continue;

            }

            

            int colMod = i % columns;

            if(colMod == 0) {

                writer.startElement("div", null);

                writer.writeAttribute("class", PanelGrid.GRID_ROW_CLASS, null); 

            }

            

            String columnClass = (colMod < columnClasses.length) ? PanelGrid.CELL_CLASS + " " + columnClasses[colMod].trim() : PanelGrid.CELL_CLASS;

            if (!columnClass.contains("ui-grid-col-")) {

                columnClass = columnClass + " " + GridLayoutUtils.getColumnClass(columns);

            }

            

            writer.startElement("div", null); 

            writer.writeAttribute("class", columnClass, null);

            child.encodeAll(context);

            writer.endElement("div");



            i++;

            colMod = i % columns;

            

            if(colMod == 0) {

                writer.endElement("div");

            }

        }

        

        writer.endElement("div");

    }

    

    public void encodeTableFacet(FacesContext context, PanelGrid grid, int columns, String facet, String tag, String styleClass) throws IOException {

        UIComponent component = grid.getFacet(facet);

        

        if(component != null && component.isRendered()) {

            ResponseWriter writer = context.getResponseWriter();

            writer.startElement(tag, null);

            writer.writeAttribute("class", styleClass, null);

            

            if(columns > 0) {

                writer.startElement("tr", null);

                writer.writeAttribute("class", "ui-widget-header", null);

                writer.writeAttribute("role", "row", null);



                writer.startElement("td", null);

                writer.writeAttribute("colspan", columns, null);

                writer.writeAttribute("role", "columnheader", null);

                

                component.encodeAll(context);

                

                writer.endElement("td");

                writer.endElement("tr");

            }

            else {

                context.getAttributes().put(Constants.HELPER_RENDERER, "panelGridFacet");

                if(component instanceof Row) {

                    encodeRow(context, (Row) component, "columnheader", "ui-widget-header", PanelGrid.CELL_CLASS + " ui-widget-header");

                }

                else if(component instanceof UIPanel) {

                    for(UIComponent child : component.getChildren()) {

                        if(child.isRendered()) {

                            if(child instanceof Row)

                                encodeRow(context, (Row) child, "columnheader", "ui-widget-header", PanelGrid.CELL_CLASS + " ui-widget-header");

                            else

                                component.encodeAll(context);

                        }

                    }

                }

                else {

                    component.encodeAll(context);

                }

                context.getAttributes().remove(Constants.HELPER_RENDERER);

            }

            

            writer.endElement(tag);

        }

    }

    

    public void encodeGridFacet(FacesContext context, PanelGrid grid, int columns, String facet, String styleClass) throws IOException {

        UIComponent component = grid.getFacet(facet);

        

        if(component != null && component.isRendered()) {

            ResponseWriter writer = context.getResponseWriter();

            

            writer.startElement("div", null);

            writer.writeAttribute("class", styleClass + " ui-widget-header", null);

            component.encodeAll(context);

            writer.endElement("div");

        }

    }

    

    @Override

    public void encodeChildren(FacesContext context, UIComponent component) throws IOException {

        //Rendering happens on encodeEnd

    }



    @Override

    public boolean getRendersChildren() {

        return true;

    }

}