Suggested case list:
Using timer to refresh a grid
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index.zulzul<zk>
<window apply="pkg$.TestComposer">
<button id="button" label="Go" autodisable="+self"/>
<progressmeter id="progressmeter" value="0"/>
<timer id="timer" delay="1000" repeats="true"/>
</window>
</zk>
TestComposer.javajavaimport org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zk.ui.ext.*;
import org.zkoss.zk.au.*;
import org.zkoss.zk.au.out.*;
import org.zkoss.zul.*;
import org.zkoss.lang.*;
public class TestComposer extends GenericForwardComposer {
// Constants
private static final String QUEUE = "queue";
private static final String START = "start";
private static final int ONE_HUNDRED = 100;
// ZK components
private Button button;
private Progressmeter progressmeter;
private Timer timer;
// Progress counter [0,100]
private int progress;
public void onClick$button() {
if(itsNotProcessing()) {
EventQueue queue = lookupQueue();
setUp(queue);
start(queue);
}
}
private boolean itsNotProcessing() {
return !EventQueues.exists(QUEUE);
}
private EventQueue lookupQueue() {
return EventQueues.lookup(QUEUE);
}
private void setUp(final EventQueue queue) {
progress = 0;
queue.subscribe(new EventListener() { // Asynchronous (worker)
public void onEvent(Event event) {
doLongOperation();
}
}, new EventListener() {
public void onEvent(Event event) { // Synchronous (callback)
removeQueue();
}
});
}
private void doLongOperation() {
for(int i = 1; i <= 10; i++) {
Threads.sleep(500);
progress += 10;
}
}
private void removeQueue() {
EventQueues.remove(QUEUE);
}
private void start(EventQueue queue) {
queue.publish(new Event(START)); // Triggers the processing. The event name does not matter.
timer.start();
}
public void onTimer$timer() {
updateProgressmeter();
if(isTheProgressmeterFull()) {
stop();
}
}
private void updateProgressmeter() {
progressmeter.setValue(progress);
}
private boolean isTheProgressmeterFull() {
return progressmeter.getValue() == ONE_HUNDRED;
}
private void stop() {
timer.stop();
button.setDisabled(false);
}
}