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

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Here is the source code for org.cruxframework.crux.widgets.client.uploader.FileButton.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 com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.InputElement;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.dom.client.Style.TextAlign;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.HasChangeHandlers;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;

/**
 * @author Thiago da Rosa de Bustamante
 *
 */
class FileButton extends Composite implements HasChangeHandlers {
    private FlowPanel mainPanel;
    private Label visibleButton;
    private FileInput fileInput;

    public FileButton() {
        mainPanel = new FlowPanel();
        mainPanel.getElement().getStyle().setPosition(Position.RELATIVE);

        fileInput = new FileInput();

        Style style = fileInput.getElement().getStyle();
        style.setPosition(Position.ABSOLUTE);
        style.setTextAlign(TextAlign.RIGHT);
        style.setOpacity(0);
        style.setProperty("cursor", "inherit");
        style.setZIndex(2);
        style.setWidth(100, Unit.PCT);
        style.setHeight(100, Unit.PCT);
        style.setTop(0, Unit.PX);
        style.setLeft(0, Unit.PX);
        mainPanel.add(fileInput);

        visibleButton = new Label();
        visibleButton.setStyleName("chooseButton");
        style = visibleButton.getElement().getStyle();
        style.setPosition(Position.ABSOLUTE);
        style.setTop(0, Unit.PX);
        style.setLeft(0, Unit.PX);
        style.setZIndex(1);
        style.setWidth(100, Unit.PCT);
        style.setHeight(100, Unit.PCT);
        mainPanel.add(visibleButton);

        initWidget(mainPanel);
        setStyleName("crux-FileButton");
    }

    public void setText(String text) {
        visibleButton.setText(text);
    }

    public String getText() {
        return visibleButton.getText();
    }

    public boolean isMultiple() {
        return fileInput.isMultiple();
    }

    public void setMultiple(boolean multiple) {
        fileInput.setMultiple(multiple);
    }

    public HandlerRegistration addChangeHandler(ChangeHandler handler) {
        return fileInput.addChangeHandler(handler);
    }
}

class FileInput extends Widget implements HasChangeHandlers {
    public FileInput() {
        InputElement fileInputElement = Document.get().createFileInputElement();
        setElement(fileInputElement);
    }

    public boolean isMultiple() {
        return getElement().getPropertyBoolean("multiple");
    }

    public void setMultiple(boolean multiple) {
        getElement().setPropertyBoolean("multiple", multiple);
    }

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