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package com.vaadin.tests.dnd;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import com.vaadin.server.StreamVariable;
import com.vaadin.server.VaadinRequest;
import com.vaadin.shared.ui.dnd.FileParameters;
import com.vaadin.shared.ui.grid.DropMode;
import com.vaadin.tests.components.AbstractTestUIWithLog;
import com.vaadin.ui.Button;
import com.vaadin.ui.Grid;
import com.vaadin.ui.Notification;
import com.vaadin.ui.ProgressBar;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.components.grid.GridDropTarget;
import com.vaadin.ui.dnd.FileDropTarget;
public class Html5FileDragAndDropUpload extends AbstractTestUIWithLog {
private static final int FILE_SIZE_LIMIT = 1024 * 1024 * 5; // 5 MB
private final boolean pushManually;
public Html5FileDragAndDropUpload() {
this(false);
}
public Html5FileDragAndDropUpload(boolean pushManually) {
this.pushManually = pushManually;
}
@Override
protected void setup(VaadinRequest request) {
Grid<FileParameters> grid = new Grid<>(
"Drop files or text on the Grid");
grid.addColumn(FileParameters::getName).setCaption("File name");
grid.addColumn(FileParameters::getSize).setCaption("File size");
grid.addColumn(FileParameters::getMime).setCaption("Mime type");
List<FileParameters> gridItems = new ArrayList<>();
AtomicBoolean cancelled = new AtomicBoolean(false);
ProgressBar progressBar = new ProgressBar(0.0f);
new FileDropTarget<Grid<FileParameters>>(grid,
event -> event.getFiles().forEach(html5File -> {
if (html5File.getFileSize() > FILE_SIZE_LIMIT) {
Notification.show(html5File.getFileName()
+ " is too large (max 5 MB)");
return;
}
UI.getCurrent().setPollInterval(200);
html5File.setStreamVariable(new StreamVariable() {
@Override
public OutputStream getOutputStream() {
return new OutputStream() {
@Override
public void write(int b) throws IOException {
// NOP
}
};
}
@Override
public boolean listenProgress() {
return true;
}
@Override
public void onProgress(StreamingProgressEvent event) {
float progress = (float) event.getBytesReceived()
/ event.getContentLength();
progressBar.setValue(progress);
log("Progress, bytesReceived="
+ event.getBytesReceived());
pushIfManual();
}
@Override
public void streamingStarted(
StreamingStartEvent event) {
cancelled.set(false);
progressBar.setValue(0.0f);
log("Stream started, fileName="
+ event.getFileName());
pushIfManual();
}
@Override
public void streamingFinished(StreamingEndEvent event) {
progressBar.setValue(1.0f);
gridItems
.add(new FileParameters(event.getFileName(),
event.getContentLength(),
event.getMimeType()));
grid.setItems(gridItems);
log("Stream finished, fileName="
+ event.getFileName());
pushIfManual();
UI.getCurrent().setPollInterval(-1);
}
@Override
public void streamingFailed(StreamingErrorEvent event) {
progressBar.setValue(0.0f);
log("Stream failed, fileName="
+ event.getFileName());
pushIfManual();
UI.getCurrent().setPollInterval(-1);
}
@Override
public boolean isInterrupted() {
return cancelled.get();
}
});
}));
GridDropTarget<FileParameters> dropTarget = new GridDropTarget<>(grid,
DropMode.ON_TOP);
dropTarget.addGridDropListener(event -> {
log("dataTransferText=" + event.getDataTransferText());
Notification.show(event.getDataTransferText());
});
Button cancelButton = new Button("Cancel",
click -> cancelled.set(true));
VerticalLayout layout = new VerticalLayout(grid, cancelButton,
progressBar);
addComponent(layout);
}
private void pushIfManual() {
if (pushManually) {
push();
}
}
@Override
protected String getTestDescription() {
return "Drop files onto the Grid to upload them or text";
}
}
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