org.cruxframework.crux.widgets.client.uploader.FileUploaderLargeImpl.java Source code

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Here is the source code for org.cruxframework.crux.widgets.client.uploader.FileUploaderLargeImpl.java

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/*
 * Copyright 2013 cruxframework.org.
 * 
 * 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 org.cruxframework.crux.widgets.client.uploader;

import org.cruxframework.crux.widgets.client.progressbar.ProgressBar;

import com.google.gwt.dom.client.Style.Float;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.DragLeaveEvent;
import com.google.gwt.event.dom.client.DragLeaveHandler;
import com.google.gwt.event.dom.client.DragOverEvent;
import com.google.gwt.event.dom.client.DragOverHandler;
import com.google.gwt.event.dom.client.DropEvent;
import com.google.gwt.event.dom.client.DropHandler;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FocusPanel;

/**
 * An HTML5 based file uploader widget.
 * 
 * @author Thiago da Rosa de Bustamante
 */
class FileUploaderLargeImpl extends AbstractFileUploader {
    private FocusPanel dropArea;

    @Override
    protected void initializeWidgets() {
        mainPanel = new FlowPanel();
        mainPanel.setStyleName("crux-FileUploader");
        filesPanel = initFilesPanel();
        if (DropEvent.isSupported()) {
            dropArea = initDropArea();
            mainPanel.add(dropArea);
            dropArea.add(filesPanel);
        } else {
            mainPanel.add(filesPanel);
        }
        FlowPanel buttonsPanel = initButtonsPanel();
        mainPanel.add(buttonsPanel);
        FlowPanel clearDiv = new FlowPanel();
        clearDiv.getElement().getStyle().setProperty("clear", "both");
        mainPanel.add(clearDiv);
    }

    protected FocusPanel initDropArea() {
        final FocusPanel dropArea = new FocusPanel();
        dropArea.setStyleName("dropArea");
        dropArea.addDragOverHandler(new DragOverHandler() {
            @Override
            public void onDragOver(DragOverEvent event) {
                event.stopPropagation();
                event.preventDefault();
                dropArea.addStyleDependentName("hover");
            }
        });
        dropArea.addDragLeaveHandler(new DragLeaveHandler() {
            @Override
            public void onDragLeave(DragLeaveEvent event) {
                event.stopPropagation();
                event.preventDefault();
                dropArea.removeStyleDependentName("hover");
            }
        });
        dropArea.addDropHandler(new DropHandler() {
            @Override
            public void onDrop(DropEvent event) {
                event.stopPropagation();
                event.preventDefault();
                dropArea.removeStyleDependentName("hover");
                processFiles(event.getNativeEvent());
            }
        });
        return dropArea;
    }

    @Override
    protected void onSelectFile(ChangeEvent event) {
        super.onSelectFile(event);
        if (dropArea != null) {
            dropArea.removeStyleDependentName("hover");
        }
    }

    protected ProgressBar createProgressBar() {
        ProgressBar progressBar = super.createProgressBar();
        progressBar.getElement().getStyle().setFloat(Float.RIGHT);
        return progressBar;
    }
}