com.sciencegadgets.client.ui.SelectionButton.java Source code

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Here is the source code for com.sciencegadgets.client.ui.SelectionButton.java

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/*******************************************************************************
 *     This file is part of ScienceGadgets, a collection of educational tools
 *     Copyright (C) 2012-2015 by John Gralyan
 *
 *     ScienceGadgets is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Affero General Public License as
 *     published by the Free Software Foundation, either version 3 of
 *     the License, or (at your option) any later version.
 *
 *     ScienceGadgets is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Affero General Public License for more details.
 *
 *     You should have received a copy of the GNU Affero General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *     
 *     Contact us at info@sciencegadgets.org
 *******************************************************************************/
package com.sciencegadgets.client.ui;

import com.google.gwt.dom.client.Style;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasClickHandlers;
import com.google.gwt.event.dom.client.HasTouchEndHandlers;
import com.google.gwt.event.dom.client.TouchEndEvent;
import com.google.gwt.event.dom.client.TouchEndHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.SimplePanel;
import com.sciencegadgets.client.Moderator;

public abstract class SelectionButton extends SimplePanel
        implements HasClickHandlers, HasTouchEndHandlers, HasFitParentHTML {

    private FitParentHTML buttonHTML = new FitParentHTML();
    private boolean isEnabled = true;

    protected SelectionButton() {
        addStyleName(CSS.TRANSFORMATION_BUTTON);
        add(buttonHTML);

        if (Moderator.isTouch) {
            addTouchEndHandler(new TouchEndHandler() {
                @Override
                public void onTouchEnd(TouchEndEvent event) {
                    if (isEnabled) {
                        onSelect();
                        event.preventDefault();
                        event.stopPropagation();
                    }
                }
            });
        } else {
            addClickHandler(new ClickHandler() {
                @Override
                public void onClick(ClickEvent event) {
                    if (isEnabled) {
                        onSelect();
                        event.preventDefault();
                        event.stopPropagation();
                    }
                }
            });
        }

    }

    protected SelectionButton(String html) {
        this();
        setHTML(html);
    }

    @Override
    public HandlerRegistration addTouchEndHandler(TouchEndHandler handler) {
        return addDomHandler(handler, TouchEndEvent.getType());
    }

    @Override
    public HandlerRegistration addClickHandler(ClickHandler handler) {
        return addDomHandler(handler, ClickEvent.getType());
    }

    abstract protected void onSelect();

    public void resize() {
        buttonHTML.resize();
    }

    public void setHTML(String html) {
        //      clear();
        buttonHTML.setHTML(html);
        buttonHTML.percentOfParent = 85;
    }

    public String getHTML() {
        return buttonHTML.getHTML();
    }

    public void setEnabled(boolean enable) {
        this.isEnabled = enable;
        Style style = getElement().getStyle();
        if (enable) {
            style.clearColor();
        } else {
            style.setColor("gray");
        }
    }

    public boolean isEnabled() {
        return isEnabled;
    }

    @Override
    public FitParentHTML getFitParentHTML() {
        return buttonHTML;
    }
}