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

Fixes #8891 

4 files changed, 210 insertions, 0 deletions

diff --git a/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetClientRpc.java b/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetClientRpc.java
new file mode 100644
index 0000000000..479e026cf7
--- /dev/null
+++ b/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetClientRpc.java
@@ -0,0 +1,37 @@
+/*
+ * 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.shared.ui.dnd;
+
+import java.util.Map;
+
+import com.vaadin.shared.communication.ClientRpc;
+
+/**
+ * RPC for sending the upload URLs to the client for uploading files.
+ *
+ * @author Vaadin Ltd
+ * @since 8.1
+ */
+public interface FileDropTargetClientRpc extends ClientRpc {
+
+    /**
+     * Sends the of upload URLs mapped to the generated file ID.
+     *
+     * @param urls
+     *         File IDs and URLs for uploading files to the server.
+     */
+    void sendUploadUrl(Map<String, String> urls);
+}
diff --git a/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetRpc.java b/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetRpc.java
new file mode 100644
index 0000000000..fd290a41f5
--- /dev/null
+++ b/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetRpc.java
@@ -0,0 +1,37 @@
+/*
+ * 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.shared.ui.dnd;
+
+import java.util.Map;
+
+import com.vaadin.shared.communication.ServerRpc;
+
+/**
+ * RPC for requesting upload URLs for files dropped on the file drop target.
+ *
+ * @author Vaadin Ltd
+ * @since 8.1
+ */
+public interface FileDropTargetRpc extends ServerRpc {
+
+    /**
+     * Called when files are dropped onto the file drop target.
+     *
+     * @param fileParams
+     *         Generated file IDs and file parameters of dropped files.
+     */
+    public void drop(Map<String, FileParameters> fileParams);
+}
diff --git a/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetState.java b/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetState.java
new file mode 100644
index 0000000000..d825a4d60f
--- /dev/null
+++ b/shared/src/main/java/com/vaadin/shared/ui/dnd/FileDropTargetState.java
@@ -0,0 +1,26 @@
+/*
+ * 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.shared.ui.dnd;
+
+/**
+ * State class containing parameters for FileDropTarget.
+ *
+ * @author Vaadin Ltd
+ * @since 8.1
+ */
+public class FileDropTargetState extends DropTargetState {
+
+}
diff --git a/shared/src/main/java/com/vaadin/shared/ui/dnd/FileParameters.java b/shared/src/main/java/com/vaadin/shared/ui/dnd/FileParameters.java
new file mode 100644
index 0000000000..0e4f5cdf76
--- /dev/null
+++ b/shared/src/main/java/com/vaadin/shared/ui/dnd/FileParameters.java
@@ -0,0 +1,110 @@
+/*
+ * 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.shared.ui.dnd;
+
+import java.io.Serializable;
+
+/**
+ * Contains parameters of a file. Used for transferring information about
+ * dropped files from the client to the server.
+ *
+ * @author Vaadin Ltd
+ * @since 8.1
+ */
+public class FileParameters implements Serializable {
+    private String name;
+    private long size;
+    private String mime;
+
+    /**
+     * Creates a file parameters object.
+     */
+    public FileParameters() {
+    }
+
+    /**
+     * Creates a file parameters object.
+     *
+     * @param name
+     *         Name of the file.
+     * @param size
+     *         Size of the file.
+     * @param mime
+     *         Mime type of the file.
+     */
+    public FileParameters(String name, long size, String mime) {
+        this.name = name;
+        this.size = size;
+        this.mime = mime;
+    }
+
+    /**
+     * Gets the file name.
+     *
+     * @return Name of the file.
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the file name.
+     *
+     * @param name
+     *         Name of the file.
+     */
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    /**
+     * Gets the file size.
+     *
+     * @return Size of the file.
+     */
+    public long getSize() {
+        return size;
+    }
+
+    /**
+     * Sets the file size.
+     *
+     * @param size
+     *         Size of the file.
+     */
+    public void setSize(long size) {
+        this.size = size;
+    }
+
+    /**
+     * Gets the mime type.
+     *
+     * @return Mime type of the file.
+     */
+    public String getMime() {
+        return mime;
+    }
+
+    /**
+     * Sets the mime type.
+     *
+     * @param mime
+     *         Mime type of the file.
+     */
+    public void setMime(String mime) {
+        this.mime = mime;
+    }
+}