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package com.vaadin.tests.components.image;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import javax.imageio.ImageIO;
import com.vaadin.event.MouseEvents.ClickEvent;
import com.vaadin.event.MouseEvents.ClickListener;
import com.vaadin.server.StreamResource;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Image;
import com.vaadin.ui.Label;
public class ImageClicks extends TestBase {
private int clickCounter = 0;
@Override
protected void setup() {
final Label label = new Label(labelText());
addComponent(label);
final Image image = new Image();
final MyImageSource imageSource = new MyImageSource();
final StreamResource imageResource = new StreamResource(imageSource,
"testimage.png");
image.setSource(imageResource);
image.addClickListener(new ClickListener() {
@Override
public void click(ClickEvent event) {
++clickCounter;
imageResource.setFilename("testimage.png?"
+ new Date().getTime());
image.markAsDirty();
label.setValue(labelText());
}
});
addComponent(image);
}
private String labelText() {
StringBuilder sb = new StringBuilder();
sb.append("Image clicked ");
sb.append(clickCounter);
sb.append(" times.");
return sb.toString();
}
@Override
protected String getDescription() {
return "Each click on the dynamically generated image should update the image and add another black square";
}
@Override
protected Integer getTicketNumber() {
return null;
}
public class MyImageSource implements StreamResource.StreamSource {
public MyImageSource() {
}
int intervalPos(int pos, int resolution, int cells) {
return (int) Math.round(pos * resolution / (cells * 1.0));
}
@Override
public InputStream getStream() {
// Create an image and draw some background on it.
BufferedImage image = new BufferedImage(300, 300,
BufferedImage.TYPE_INT_RGB);
Graphics drawable = image.getGraphics();
// Background
drawable.setColor(Color.white);
drawable.fillRect(0, 0, 300, 300);
final int rows = 4;
final int cols = 4;
// Grid
for (int row = 0; row < rows; row++) {
int gridy = intervalPos(row, 300, rows);
int gridynext = intervalPos(row + 1, 300, rows);
// Horizontal grid line
if (row > 0) {
drawable.setColor(Color.lightGray);
drawable.drawLine(0, gridy, 300 - 1, gridy);
}
for (int col = 0; col < cols; col++) {
int gridx = intervalPos(col, 300, cols);
int gridxnext = intervalPos(col + 1, 300, cols);
// Vertical grid line
if (row == 0 && col > 0) {
drawable.setColor(Color.lightGray);
drawable.drawLine(gridx, 0, gridx, 300 - 1);
}
// Cell
int cellIndex = col + row * cols;
if (clickCounter > cellIndex) {
drawable.setColor(Color.black);
} else {
drawable.setColor(Color.white);
}
drawable.fillRect(gridx + 1, gridy + 1, gridxnext - gridx
- 1, gridynext - gridy - 1);
}
}
try {
// Write the image to a buffer.
ByteArrayOutputStream imagebuffer = new ByteArrayOutputStream();
ImageIO.write(image, "png", imagebuffer);
// Return a stream from the buffer.
ByteArrayInputStream istream = new ByteArrayInputStream(
imagebuffer.toByteArray());
return istream; // new DownloadStream (istream,null,null);
} catch (IOException e) {
return null;
}
}
}
}
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