Make it possible to upload files by dropping them onto a drop target (#9277)

Fixes #8891 

1 files changed, 164 insertions, 0 deletions

diff --git a/uitest/src/main/java/com/vaadin/tests/dnd/Html5FileDragAndDropUpload.java b/uitest/src/main/java/com/vaadin/tests/dnd/Html5FileDragAndDropUpload.java
new file mode 100644
index 0000000000..211d50d047
--- /dev/null
+++ b/uitest/src/main/java/com/vaadin/tests/dnd/Html5FileDragAndDropUpload.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright 2000-2016 Vaadin Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.dnd;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+import com.vaadin.server.StreamVariable;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.shared.ui.dnd.FileParameters;
+import com.vaadin.tests.components.AbstractTestUIWithLog;
+import com.vaadin.ui.FileDropTarget;
+import com.vaadin.ui.Grid;
+import com.vaadin.ui.Html5File;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.Layout;
+import com.vaadin.ui.VerticalLayout;
+
+public class Html5FileDragAndDropUpload extends AbstractTestUIWithLog {
+
+    @Override
+    protected void setup(VaadinRequest request) {
+
+        Label dropArea = new Label("Drop files here");
+
+        FileDropTarget<Label> dropTarget = new FileDropTarget<>(dropArea,
+                event -> {
+                    List<Html5File> files = event.getFiles();
+                    if (files != null) {
+                        files.forEach(file -> {
+                            file.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) {
+                                    log("Progress, bytesReceived=" + event
+                                            .getBytesReceived());
+                                }
+
+                                @Override
+                                public void streamingStarted(
+                                        StreamingStartEvent event) {
+                                    log("Stream started, fileName=" + event
+                                            .getFileName());
+                                }
+
+                                @Override
+                                public void streamingFinished(
+                                        StreamingEndEvent event) {
+                                    log("Stream finished, fileName=" + event
+                                            .getFileName());
+                                }
+
+                                @Override
+                                public void streamingFailed(
+                                        StreamingErrorEvent event) {
+                                    log("Stream failed, fileName=" + event
+                                            .getFileName());
+                                }
+
+                                @Override
+                                public boolean isInterrupted() {
+                                    return false;
+                                }
+                            });
+                        });
+                    }
+                });
+
+        Grid<FileParameters> grid = new 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<>();
+
+        new FileDropTarget<Grid<FileParameters>>(grid, event -> {
+            event.getFiles().forEach(html5File -> {
+                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 false;
+                    }
+
+                    @Override
+                    public void onProgress(StreamingProgressEvent event) {
+                        // NOP
+                    }
+
+                    @Override
+                    public void streamingStarted(StreamingStartEvent event) {
+                        // NOP
+                    }
+
+                    @Override
+                    public void streamingFinished(StreamingEndEvent event) {
+                        gridItems.add(new FileParameters(event.getFileName(),
+                                event.getContentLength(), event.getMimeType()));
+                        grid.setItems(gridItems);
+                    }
+
+                    @Override
+                    public void streamingFailed(StreamingErrorEvent event) {
+
+                    }
+
+                    @Override
+                    public boolean isInterrupted() {
+                        return false;
+                    }
+                });
+            });
+        });
+
+        Layout layout = new VerticalLayout(dropArea, grid);
+
+        addComponent(layout);
+    }
+
+    @Override
+    protected String getTestDescription() {
+        return "Drop and upload files onto file drop target";
+    }
+}