gwtupload.client.dnd.DropZoneFileInput.java Source code

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Here is the source code for gwtupload.client.dnd.DropZoneFileInput.java

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/*
 * Copyright 2014 Manuel Carrasco Moino. (manolo at apache/org)
 * http://code.google.com/p/gwtupload
 *
 * 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 gwtupload.client.dnd;

import com.google.gwt.dom.client.Document;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.HasAllDragAndDropHandlers;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;

import java.util.List;

import gwtupload.client.FileList;
import gwtupload.client.IFileInput;
import gwtupload.client.Uploader;

/**
 * @author Sultan Tezadov
 * @author Manolo Carrasco Moino
 */
public class DropZoneFileInput extends Label
        implements HasAllDragAndDropHandlers, IFileInput, IDragAndDropFileInput {

    boolean i18n = true;

    private HasAllDragAndDropHandlers externalDropZoneWidget;
    private DragAndDropFilesProvider dragAndDropFilesProvider;
    public static final String STYLE_DROP_ZONE = "upld-drop-zone";
    public static final String STYLE_DROP_ZONE_SENDING = "upld-drop-zone-sending";
    public static final String STYLE_DROP_ZONE_DISABLED = "upld-drop-zone-disabled";
    private Widget dropZone;

    public DropZoneFileInput() {
        this(null, true);
    }

    public DropZoneFileInput(HasAllDragAndDropHandlers dropZoneWidget) {
        this(dropZoneWidget, true);
    }

    public DropZoneFileInput(HasAllDragAndDropHandlers dropZoneWidget, boolean i18n) {
        super(Document.get().createSpanElement());
        this.i18n = i18n;
        if (dropZoneWidget == null) {
            if (i18n) {
                setText(Uploader.I18N_CONSTANTS.uploaderDrop());
            }
        }
        init(dropZoneWidget, dropZoneWidget);
    }

    private void init(HasAllDragAndDropHandlers dropZoneWidget, HasAllDragAndDropHandlers externalDropZoneWidget) {
        if (dropZoneWidget == null) {
            dropZoneWidget = this;
        }
        this.externalDropZoneWidget = externalDropZoneWidget;
        dragAndDropFilesProvider = new DragAndDropFilesProvider(dropZoneWidget);
        dragAndDropFilesProvider.addValueChangeHandler(new ValueChangeHandler<FileList>() {
            public void onValueChange(ValueChangeEvent<FileList> event) {
                fireChangeEvent();
            }
        });
        dropZone = (Widget) dropZoneWidget;
        dropZone.addStyleName(STYLE_DROP_ZONE);
    }

    public boolean hasFiles() {
        return dragAndDropFilesProvider.thereAreDragAndDropedFiles();
    }

    @Override
    public void reset() {
        dragAndDropFilesProvider.reset();
        dropZone.removeStyleName(STYLE_DROP_ZONE_SENDING);
    }

    @Override
    public void lock() {
        dropZone.addStyleName(STYLE_DROP_ZONE_SENDING);
        dragAndDropFilesProvider.lock();
    }

    public FileList getFiles() {
        return dragAndDropFilesProvider.getDragAndDropedFiles();
    }

    public String getFilename() {
        return dragAndDropFilesProvider.getFilename();
    }

    public List<String> getFilenames() {
        return dragAndDropFilesProvider.getFilenames();
    }

    public String getName() {
        return dragAndDropFilesProvider.getName();
    }

    public Widget getWidget() {
        return asWidget();
    }

    public boolean isEnabled() {
        return dragAndDropFilesProvider.isEnabled();
    }

    public IFileInput newInstance() {
        return new DropZoneFileInput(externalDropZoneWidget, true);
    }

    public void setEnabled(boolean b) {
        dragAndDropFilesProvider.setEnabled(b);
    }

    public void setLength(int length) {
    }

    public void setName(String fieldName) {
        dragAndDropFilesProvider.setName(fieldName);
    }

    public void setText(String text) {
        if (i18n) {
            super.setText(text);
        }
    }

    public void updateSize() {
    }

    public void enableMultiple(boolean b) {
    }

    public void setAccept(String accept) {
    }

    public HandlerRegistration addChangeHandler(ChangeHandler handler) {
        return addDomHandler(handler, ChangeEvent.getType());
    }

    private void fireChangeEvent() {
        ChangeEvent.fireNativeEvent(Document.get().createChangeEvent(), this);
    }
}