FileUpload.java

/*
 * Copyright 2015 JBoss, by Red Hat, Inc
 *
 * 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.uberfire.ext.widgets.common.client.common;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.InputElement;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Widget;
import org.gwtbootstrap3.client.ui.Input;
import org.gwtbootstrap3.client.ui.InputGroupAddon;
import org.uberfire.mvp.Command;

public class FileUpload
        extends Composite {

    private static final String FAKEPATH = "c:\\fakepath\\";
    private static FileUploadBinder uiBinder = GWT.create(FileUploadBinder.class);
    private final Command command;
    @UiField
    InputGroupAddon uploadButton;

    @UiField
    InputGroupAddon chooseButton;

    @UiField
    Input file;

    @UiField
    Input fileText;

    private boolean isDisabled = false;

    public FileUpload() {
        this(null,
             false);
    }

    public FileUpload(final Command command) {
        this(command,
             true);
    }

    public FileUpload(final Command command,
                      boolean displayUploadButton) {
        initWidget(uiBinder.createAndBindUi(this));
        this.command = command;
        fileText.setReadOnly(true);

        file.addChangeHandler(getFileChangeHandler());

        chooseButton.addDomHandler(new ClickHandler() {
                                       @Override
                                       public void onClick(ClickEvent event) {
                                           ((InputElement) file.getElement().cast()).click();
                                       }
                                   },
                                   ClickEvent.getType());

        if (displayUploadButton) {
            uploadButton.addDomHandler(new ClickHandler() {
                                           @Override
                                           public void onClick(ClickEvent event) {
                                               if (isDisabled) {
                                                   return;
                                               }
                                               if (command != null) {
                                                   command.execute();
                                               }
                                           }
                                       },
                                       ClickEvent.getType());
        } else {
            uploadButton.removeFromParent();
            uploadButton = null;
        }
    }

    public void setName(final String name) {
        file.setName(name);
    }

    public void upload() {
        command.execute();
    }

    public String getFilename() {
        return file.getValue();
    }

    public void setEnabled(boolean b) {
        if (uploadButton == null) {
            return;
        }
        if (!b) {
            isDisabled = true;
            uploadButton.addStyleName("disabled");
        } else {
            isDisabled = false;
            uploadButton.removeStyleName("disabled");
        }
    }

    protected ChangeHandler getFileChangeHandler() {
        return new ChangeHandler() {
            @Override
            public void onChange(ChangeEvent event) {
                String fileName = file.getValue();
                if (fileName.toLowerCase().startsWith(FAKEPATH)) {
                    fileName = fileName.substring(FAKEPATH.length());
                }
                fileText.setValue(fileName);
            }
        };
    }

    interface FileUploadBinder extends UiBinder<Widget, FileUpload> {

    }
}