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package com.vaadin.tests.components.embedded;
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.terminal.StreamResource;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Button;
import com.vaadin.ui.Embedded;
import com.vaadin.ui.Button.ClickEvent;
public class EmbeddedImageRefresh extends TestBase {
@Override
protected String getDescription() {
return "Tests if requestRepaint() makes the browser reload a dynamic resource.";
}
@Override
protected Integer getTicketNumber() {
return 2470;
}
@Override
protected void setup() {
// Create the embedded.
final Embedded embedded = new Embedded();
embedded.setDescription("Click on the grid cells to switch them.");
addComponent(embedded);
// Attach it to a resource.
final MyImageSource imageSource = new MyImageSource();
final StreamResource imageResource = new StreamResource(imageSource,
"testimage.png", this);
imageResource.setCacheTime(0);
embedded.setSource(imageResource);
// The button requests repainting the embedded.
Button button = new Button("refr");
button.addListener(new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
embedded.requestRepaint();
}
});
addComponent(button);
button = new Button("refr name");
button.addListener(new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
((StreamResource) embedded.getSource()).setFilename(new Date()
.getTime()
+ ".png");
embedded.requestRepaint();
}
});
addComponent(button);
button = new Button("200x200");
button.addListener(new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
embedded.setWidth("200px");
embedded.setHeight("200px");
}
});
addComponent(button);
button = new Button("undef");
button.addListener(new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
embedded.setSizeUndefined();
}
});
addComponent(button);
}
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));
}
public InputStream getStream() {
// Create an image and draw some background on it.
BufferedImage image = new BufferedImage(640, 480,
BufferedImage.TYPE_INT_RGB);
Graphics drawable = image.getGraphics();
// Background
drawable.setColor(Color.white);
drawable.fillRect(0, 0, 640, 480);
final int rows = 10;
final int cols = 10;
// Grid
for (int row = 0; row < rows; row++) {
int gridy = intervalPos(row, 480, rows);
int gridynext = intervalPos(row + 1, 480, rows);
// Horizontal grid line
if (row > 0) {
drawable.setColor(Color.lightGray);
drawable.drawLine(0, gridy, 640 - 1, gridy);
}
for (int col = 0; col < cols; col++) {
int gridx = intervalPos(col, 640, cols);
int gridxnext = intervalPos(col + 1, 640, cols);
// Vertical grid line
if (row == 0 && col > 0) {
drawable.setColor(Color.lightGray);
drawable.drawLine(gridx, 0, gridx, 480 - 1);
}
// Cell
if (Math.random() < 0.5f) {
drawable.setColor(Color.white);
} else {
drawable.setColor(Color.black);
}
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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