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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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