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package com.vaadin.v7.tests.components.grid;
import java.util.Calendar;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import com.vaadin.annotations.Push;
import com.vaadin.server.VaadinRequest;
import com.vaadin.tests.components.AbstractTestUI;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.v7.data.Item;
import com.vaadin.v7.data.util.IndexedContainer;
import com.vaadin.v7.event.SelectionEvent;
import com.vaadin.v7.event.SelectionEvent.SelectionListener;
import com.vaadin.v7.ui.Grid;
import com.vaadin.v7.ui.Grid.SelectionMode;
@Push
@SuppressWarnings("serial")
/**
*
* Uses scrollToEnd() method in Grid. Should be migrated once it's available.
*
*/
public class GridFastAsyncUpdate extends AbstractTestUI {
private final Runnable addRowsTask = new Runnable() {
@Override
public void run() {
System.out.println("Logging...");
try {
Random random = new Random();
while (!Thread.currentThread().isInterrupted()) {
Thread.sleep(random.nextInt(100));
GridFastAsyncUpdate.this.access(new Runnable() {
@SuppressWarnings("unchecked")
@Override
public void run() {
++counter;
Item item = container.addItem(counter);
item.getItemProperty("sequenceNumber")
.setValue(String.valueOf(counter));
item.getItemProperty("millis")
.setValue(String.valueOf(Calendar
.getInstance().getTimeInMillis()
- loggingStart));
item.getItemProperty("level")
.setValue(Level.INFO.toString());
item.getItemProperty("message").setValue("Message");
if (grid != null && !scrollLock) {
grid.scrollToEnd();
}
}
});
}
} catch (InterruptedException e) {
System.out.println("logging thread interrupted");
}
}
};
private int counter;
private Grid grid;
private IndexedContainer container;
private long loggingStart;
private volatile boolean scrollLock = false;
@Override
protected void setup(VaadinRequest vaadinRequest) {
final VerticalLayout layout = new VerticalLayout();
layout.setSizeFull();
layout.setMargin(true);
addComponent(layout);
HorizontalLayout buttons = new HorizontalLayout();
layout.addComponent(buttons);
final ExecutorService logExecutor = Executors.newSingleThreadExecutor();
final Button logButton = new Button("Start logging");
logButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(ClickEvent event) {
if ("Start logging".equals(logButton.getCaption())) {
loggingStart = Calendar.getInstance().getTimeInMillis();
logExecutor.submit(addRowsTask);
logButton.setCaption("Stop logging");
} else {
System.out.println("Stop logging...");
try {
logExecutor.shutdownNow();
} catch (Exception e) {
e.printStackTrace();
}
logButton.setCaption("Start logging");
}
}
});
buttons.addComponent(logButton);
final Button scrollButton = new Button("Stop scrolling");
scrollButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(ClickEvent event) {
if (!scrollLock) {
System.out.println("Stop scrolling");
scrollButton.setCaption("Start scrolling");
scrollLock = true;
} else {
System.out.println("Start scrolling");
scrollButton.setCaption("Stop scrolling");
scrollLock = false;
}
}
});
buttons.addComponent(scrollButton);
container = new IndexedContainer();
container.addContainerProperty("sequenceNumber", String.class, null);
container.addContainerProperty("millis", String.class, null);
container.addContainerProperty("level", String.class, null);
container.addContainerProperty("message", String.class, null);
grid = new Grid(container);
grid.setWidth("100%");
grid.setSelectionMode(SelectionMode.SINGLE);
grid.addSelectionListener(new SelectionListener() {
@Override
public void select(final SelectionEvent event) {
if (grid.getSelectedRow() != null) {
disableScroll();
}
}
});
layout.addComponent(grid);
layout.setExpandRatio(grid, 1.0f);
}
protected void disableScroll() {
scrollLock = true;
}
}
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