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Vaadin is a web application framework for Rich Internet Applications (RIA). Vaadin enables easy development and maintenance of fast and secure rich web applications with a stunning look and feel and a wide browser support. It features a server-side architecture with the majority of the logic running on the server. Ajax technology is used at the browser-side to ensure a rich and interactive user experience.

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/*
 * Copyright 2000-2014 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.client.ui.upload;

import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.vaadin.client.ApplicationConnection;
import com.vaadin.client.Paintable;
import com.vaadin.client.UIDL;
import com.vaadin.client.communication.StateChangeEvent;
import com.vaadin.client.ui.AbstractComponentConnector;
import com.vaadin.client.ui.VUpload;
import com.vaadin.shared.EventId;
import com.vaadin.shared.ui.Connect;
import com.vaadin.shared.ui.upload.UploadClientRpc;
import com.vaadin.shared.ui.upload.UploadServerRpc;
import com.vaadin.ui.Upload;

@Connect(Upload.class)
public class UploadConnector extends AbstractComponentConnector implements
        Paintable {

    public UploadConnector() {
        registerRpc(UploadClientRpc.class, new UploadClientRpc() {
            @Override
            public void submitUpload() {
                getWidget().submit();
            }
        });
    }

    @Override
    protected void init() {
        super.init();

        getWidget().fu.addChangeHandler(new ChangeHandler() {
            @Override
            public void onChange(ChangeEvent event) {
                if (hasEventListener(EventId.CHANGE)) {
                    getRpcProxy(UploadServerRpc.class).change(
                            getWidget().fu.getFilename());
                }
            }
        });
    }

    @Override
    public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
        if (!isRealUpdate(uidl)) {
            return;
        }
        if (uidl.hasAttribute("notStarted")) {
            getWidget().t.schedule(400);
            return;
        }
        getWidget().setImmediate(getState().immediate);
        getWidget().client = client;
        getWidget().paintableId = uidl.getId();
        getWidget().nextUploadId = uidl.getIntAttribute("nextid");
        final String action = client.translateVaadinUri(uidl
                .getStringVariable("action"));
        getWidget().element.setAction(action);
        if (uidl.hasAttribute("buttoncaption")) {
            getWidget().submitButton.setText(uidl
                    .getStringAttribute("buttoncaption"));
            getWidget().submitButton.setVisible(true);
        } else {
            getWidget().submitButton.setVisible(false);
        }
        getWidget().fu.setName(getWidget().paintableId + "_file");

        if (!isEnabled() || isReadOnly()) {
            getWidget().disableUpload();
        } else if (!uidl.getBooleanAttribute("state")) {
            // Enable the button only if an upload is not in progress
            getWidget().enableUpload();
            getWidget().ensureTargetFrame();
        }
    }

    @Override
    public void onStateChanged(StateChangeEvent stateChangeEvent) {
        super.onStateChanged(stateChangeEvent);

        getWidget().disableTitle(hasTooltip());
    }

    @Override
    public VUpload getWidget() {
        return (VUpload) super.getWidget();
    }
}