org.primefaces.component.datascroller.DataScrollerRenderer Maven / Gradle / Ivy
/*
* The MIT License
*
* Copyright (c) 2009-2023 PrimeTek Informatics
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.primefaces.component.datascroller;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import org.primefaces.PrimeFaces;
import org.primefaces.model.LazyDataModel;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.ComponentUtils;
import org.primefaces.util.WidgetBuilder;
public class DataScrollerRenderer extends CoreRenderer {
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
DataScroller ds = (DataScroller) component;
Map params = context.getExternalContext().getRequestParameterMap();
String clientId = ds.getClientId(context);
int chunkSize = ds.getChunkSize();
if (ds.isLoadRequest()) {
int offset = Integer.parseInt(context.getExternalContext().getRequestParameterMap().get(clientId + "_offset"));
loadChunk(context, ds, offset, ds.getChunkSize());
}
else if (ds.isVirtualScrollingRequest(context)) {
int offset = Integer.parseInt(params.get(clientId + "_first"));
int rowCount = ds.getRowCount();
int virtualScrollRows = (chunkSize * 2);
int scrollRows = (offset + virtualScrollRows) > rowCount ? (rowCount - offset) : virtualScrollRows;
loadChunk(context, ds, offset, scrollRows);
}
else {
if (chunkSize == 0) {
chunkSize = ds.getRowCount();
}
encodeMarkup(context, ds, chunkSize);
encodeScript(context, ds, chunkSize);
}
}
protected void encodeMarkup(FacesContext context, DataScroller ds, int chunkSize) throws IOException {
ResponseWriter writer = context.getResponseWriter();
String clientId = ds.getClientId(context);
boolean inline = ds.getMode().equals("inline");
boolean isLazy = ds.isLazy();
UIComponent header = ds.getFacet("header");
UIComponent loader = ds.getFacet("loader");
UIComponent loading = ds.getFacet("loading");
String contentCornerClass = null;
String containerClass = inline ? DataScroller.INLINE_CONTAINER_CLASS : DataScroller.CONTAINER_CLASS;
String style = ds.getStyle();
String userStyleClass = ds.getStyleClass();
String styleClass = (userStyleClass == null) ? containerClass : containerClass + " " + userStyleClass;
writer.startElement("div", ds);
writer.writeAttribute("id", clientId, null);
writer.writeAttribute("class", styleClass, null);
if (style != null) {
writer.writeAttribute("style", style, null);
}
if (ComponentUtils.shouldRenderFacet(header)) {
writer.startElement("div", ds);
writer.writeAttribute("class", DataScroller.HEADER_CLASS, null);
header.encodeAll(context);
writer.endElement("div");
contentCornerClass = "ui-corner-bottom";
}
else {
contentCornerClass = "ui-corner-all";
}
writer.startElement("div", ds);
writer.writeAttribute("class", DataScroller.CONTENT_CLASS + " " + contentCornerClass, null);
if (inline) {
writer.writeAttribute("style", "height:" + ds.getScrollHeight() + "px", null);
}
writer.startElement("div", null);
writer.writeAttribute("class", DataScroller.LOADING_CLASS, null);
if (ComponentUtils.shouldRenderFacet(loading)) {
loading.encodeAll(context);
}
else {
writer.startElement("div", null);
writer.writeAttribute("class", DataScroller.LOADING_CLASS + "-default", null);
writer.endElement("div");
}
writer.endElement("div");
int rowCount = ds.getRowCount();
int start = 0;
if (inline && ds.isVirtualScroll()) {
int virtualScrollRowCount = (chunkSize * 2);
int rowCountToRender = (isLazy && rowCount == 0) ? virtualScrollRowCount : ((virtualScrollRowCount > rowCount) ? rowCount : virtualScrollRowCount);
if (ds.isStartAtBottom()) {
int totalPage = (int) Math.ceil(rowCount * 1d / chunkSize);
start = Math.max((totalPage - 2) * chunkSize, 0);
}
encodeVirtualScrollList(context, ds, start, rowCountToRender);
}
else {
if (ds.isStartAtBottom()) {
start = rowCount > chunkSize ? rowCount - chunkSize : 0;
}
encodeList(context, ds, start, chunkSize);
writer.startElement("div", null);
writer.writeAttribute("class", DataScroller.LOADER_CLASS, null);
if (rowCount > chunkSize && ComponentUtils.shouldRenderFacet(loader)) {
loader.encodeAll(context);
}
writer.endElement("div");
}
writer.endElement("div");
writer.endElement("div");
}
protected void encodeList(FacesContext context, DataScroller ds, int start, int chunkSize) throws IOException {
ResponseWriter writer = context.getResponseWriter();
writer.startElement("ul", ds);
writer.writeAttribute("class", DataScroller.LIST_CLASS, null);
loadChunk(context, ds, start, chunkSize);
ds.setRowIndex(-1);
writer.endElement("ul");
}
protected void encodeVirtualScrollList(FacesContext context, DataScroller ds, int start, int chunkSize) throws IOException {
ResponseWriter writer = context.getResponseWriter();
writer.startElement("div", null);
writer.writeAttribute("class", DataScroller.VIRTUALSCROLL_WRAPPER_CLASS, null);
encodeList(context, ds, start, chunkSize);
writer.endElement("div");
}
protected void encodeScript(FacesContext context, DataScroller ds, int chunkSize) throws IOException {
String loadEvent = ds.getFacet("loader") == null ? "scroll" : "manual";
WidgetBuilder wb = getWidgetBuilder(context);
wb.init("DataScroller", ds)
.attr("chunkSize", chunkSize)
.attr("totalSize", getTotalSize(ds))
.attr("loadEvent", loadEvent)
.attr("mode", ds.getMode(), "document")
.attr("buffer", ds.getBuffer())
.attr("virtualScroll", ds.isVirtualScroll())
.attr("startAtBottom", ds.isStartAtBottom());
encodeClientBehaviors(context, ds);
wb.finish();
}
protected int getTotalSize(DataScroller ds) {
if (ds.isLazy()) {
LazyDataModel lazyModel = (LazyDataModel) ds.getValue();
if (lazyModel != null) {
return lazyModel.count(Collections.emptyMap());
}
}
return ds.getRowCount();
}
protected void loadChunk(FacesContext context, DataScroller ds, int start, int size) throws IOException {
ResponseWriter writer = context.getResponseWriter();
boolean isLazy = ds.isLazy();
int _start = start < 0 ? 0 : start;
if (isLazy) {
loadLazyData(context, ds, _start, size);
}
String rowIndexVar = ds.getRowIndexVar();
Map requestMap = context.getExternalContext().getRequestMap();
int lastIndex = (_start + size);
lastIndex = start < 0 ? lastIndex + start : lastIndex;
for (int i = _start; i < lastIndex; i++) {
ds.setRowIndex(i);
if (rowIndexVar != null) {
requestMap.put(rowIndexVar, i);
}
if (!ds.isRowAvailable()) {
break;
}
writer.startElement("li", null);
writer.writeAttribute("class", DataScroller.ITEM_CLASS, null);
renderChildren(context, ds);
writer.endElement("li");
}
ds.setRowIndex(-1);
if (rowIndexVar != null) {
requestMap.remove(rowIndexVar);
}
}
protected void loadLazyData(FacesContext context, DataScroller ds, int start, int size) {
LazyDataModel lazyModel = (LazyDataModel) ds.getValue();
if (lazyModel != null) {
List data = lazyModel.load(start, size, Collections.emptyMap(), Collections.emptyMap());
lazyModel.setPageSize(size);
lazyModel.setWrappedData(data);
//Update virtualscoller for callback
if (ComponentUtils.isRequestSource(ds, context) && ds.isVirtualScroll()) {
PrimeFaces.current().ajax().addCallbackParam("totalSize", lazyModel.getRowCount());
}
}
}
@Override
public void encodeChildren(FacesContext context, UIComponent component) throws IOException {
//Rendering happens on encodeEnd
}
@Override
public boolean getRendersChildren() {
return true;
}
}
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