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index.zulzul<zk>
<grid apply="org.zkoss.bind.BindComposer"
viewModel="@id('vm') @init('pkg$.MainViewModel')"
model="@load(vm.model)"
onAfterRender="@command('loadImages')">
<columns>
<column width="190px"/>
<column/>
</columns>
<template name="model" var="group">
<row>
<image/>
<listbox model="@load(group.items)">
<template name="model" var="item">
<listitem label="@load(item.name)"
onClick="@command('openDetail', item=item)"/>
</template>
</listbox>
</row>
</template>
</grid>
</zk>MainViewModel.javajavaimport java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.zkoss.bind.annotation.BindingParam;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.ContextParam;
import org.zkoss.bind.annotation.ContextType;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.select.Selectors;
import org.zkoss.zul.Grid;
import org.zkoss.zul.Image;
import org.zkoss.zul.Window;
public class MainViewModel {
private List<Group> groupList = new ArrayList<Group>();
public MainViewModel() {
for(int i = 0; i<3; i++) {
Group group = new Group();
group.setTitle("No " + (i+1));
for(int j = 0; j<7; j++) {
Item item = new Item();
item.setName("Item " + (i+1) + ":" + (j+1));
item.setDetails("Details for " + item.getName());
item.setGroup(group);
group.addItem(item);
}
groupList.add(group);
}
}
public List<Group> getModel() {
return groupList;
}
@Command
public void loadImages(
@ContextParam(ContextType.VIEW) Grid mainGrid) {
List<Image> images = (List) Selectors.find(mainGrid, "image");
if(images.size() == groupList.size()) {
LoadImageOp loadImageOp = new LoadImageOp(groupList, images);
LoadImageOp.EXECUTOR_SERVICE.submit(loadImageOp);
}
}
@Command
public void openDetail(@BindingParam("item") Item item) {
Map args = new HashMap();
args.put("item",item);
Window window = (Window) Executions.createComponents("detailWindow.zul", null, args);
window.doModal();
}
}
Group.javajavaimport java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
public class Group {
private String title;
private List<Item> items = new ArrayList<Item>();
public void addItem(Item item) {
items.add(item);
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public List<Item> getItems() {
return items;
}
public void setItems(List<Item> items) {
this.items = items;
}
public BufferedImage getThumbnail() {
BufferedImage image = new BufferedImage(150, 150, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setColor(Color.RED);
g.fillRect(0, 0, 150, 150);
g.setColor(Color.YELLOW);
g.setFont(new Font("Arial", Font.BOLD, 20));
g.drawString(title, 50, 80);
return image;
}
}
Item.javajavapublic class Item {
private String name;
private String details;
private Group group;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDetails() {
return details;
}
public void setDetails(String details) {
this.details = details;
}
public Group getGroup() {
return group;
}
public void setGroup(Group group) {
this.group = group;
}
}
detailWindow.zulzul<window id="detailWindow" title="Detail"
apply="org.zkoss.bind.BindComposer"
viewModel="@id('detail') @init('pkg$.DetailViewModel')"
width="500px" position="center,center" border="normal" closable="true">
<hlayout>
<image id="thumbnail"/>
<vlayout>
<hlayout>
Item: <label value="@load(detail.item.name)"/>
</hlayout>
<hlayout>
Detail: <label value="@load(detail.item.details)"/>
</hlayout>
</vlayout>
</hlayout>
</window>DetailViewModel.javajavaimport java.util.Arrays;
import java.util.List;
import java.util.Map;
import org.zkoss.bind.annotation.AfterCompose;
import org.zkoss.bind.annotation.ContextParam;
import org.zkoss.bind.annotation.ContextType;
import org.zkoss.bind.annotation.Init;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.select.Selectors;
import org.zkoss.zul.Image;
import org.zkoss.zul.Window;
public class DetailViewModel {
private Item item;
public Item getItem() {
return item;
}
@Init
public void init(Component comp) throws Exception {
Map args = Executions.getCurrent().getArg();
this.item = (Item) args.get("item");
}
@AfterCompose
public void afterCompose(@ContextParam(ContextType.VIEW) Window view) {
List<Image> images = (List) Selectors.find(view, "#thumbnail");
List<Group> groups = Arrays.asList(item.getGroup());
LoadImageOp loadCoverOp = new LoadImageOp(groups, images);
LoadImageOp.EXECUTOR_SERVICE.submit(loadCoverOp);
}
}
LoadImageOp.javajavaimport java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.zkoss.zk.ui.Desktop;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.EventListener;
import org.zkoss.zul.Image;
public class LoadImageOp implements Runnable {
public static final ExecutorService EXECUTOR_SERVICE = Executors.newSingleThreadExecutor();
private List<Group> groups;
private List<Image> images;
private Desktop desktop;
private ImageLoadedListener listener;
public LoadImageOp(List<Group> groups, List<Image> images) {
if(groups.size() != images.size()) {
throw new IllegalArgumentException("The number of groups and images must be equal!");
}
this.groups = groups;
this.images = images;
this.desktop = Executions.getCurrent().getDesktop();
desktop.enableServerPush(true);
this.listener = new ImageLoadedListener();
}
@Override
public void run() {
int i = 0;
for(Group group : groups) {
BufferedImage image = group.getThumbnail();
ImageLoadedEvent event = new ImageLoadedEvent(images.get(i++), image);
Executions.schedule(desktop, listener, event);
}
}
private class ImageLoadedEvent extends Event {
public ImageLoadedEvent(Image component, RenderedImage image) {
super("onImageLoaded", component, image);
}
public Image getComponent() {
return (Image) getTarget();
}
public RenderedImage getImage() {
return (RenderedImage) getData();
}
}
private class ImageLoadedListener implements EventListener<ImageLoadedEvent> {
private int counter = 0;
@Override
public void onEvent(ImageLoadedEvent event) throws Exception {
if(event.getImage() != null) {
event.getComponent().setContent(event.getImage());
}
counter++;
// Disable server push after all images has been loaded.
if(counter == images.size()) {
desktop.enableServerPush(false);
}
}
}
}