nl.strohalm.cyclos.mobile.client.ui.widgets.Spinner.java Source code

Introduction

Here is the source code for nl.strohalm.cyclos.mobile.client.ui.widgets.Spinner.java

Source

/*
This file is part of Cyclos (www.cyclos.org).
A project of the Social Trade Organisation (www.socialtrade.org).
    
Cyclos is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
    
Cyclos 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 General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with Cyclos; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    
 */
package nl.strohalm.cyclos.mobile.client.ui.widgets;

import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Image;

/**
 * Displays an image which can be rotated.
 */
public class Spinner extends Composite {

    private Image image;

    private int degreeSum;
    private int degreeMultiplier;
    private int delay;

    public Spinner(Image image) {
        this(image, "spinner");
    }

    public Spinner(Image image, String style) {
        this.image = image;
        this.degreeSum = 36;
        this.degreeMultiplier = 10;
        this.delay = 50;

        FlowPanel container = new FlowPanel();
        container.setStyleName(style);
        container.add(this.image);
        initWidget(container);
    }

    /**
     * Sets the spinner rotation variables
     */
    public void setCustomRotation(int degreeSum, int degreeMultiplier, int delay) {
        this.degreeSum = degreeSum;
        this.degreeMultiplier = degreeMultiplier;
        this.delay = delay;
    }

    /**
     * Starts image rotation
     */
    public void startSpinner() {
        // Stop spinner instantly before start a new rotation
        stopSpinner(image.getElement());
        startSpinner(image.getElement(), degreeSum, degreeMultiplier, delay);
    }

    /**
     * Starts element rotation using CSS3 properties and native JavaScript     
     */
    private final native void startSpinner(Element instance, int degSum, int degMulti, int delay) /*-{
                                                                                                  $wnd.startSpinner(instance, degSum, degMulti, delay);
                                                                                                  }-*/;

    /**
     * Stops image rotation with a bit of delay 
     * to avoid an ugly effect
     */
    public void stopSpinner() {
        Timer t = new Timer() {
            @Override
            public void run() {
                stopSpinner(image.getElement());
            }
        };
        t.schedule(750);
    }

    /**
     * Stops element rotation using native JavaScript
     */
    private final native void stopSpinner(Element instance) /*-{
                                                            $wnd.stopSpinner(instance);
                                                            }-*/;
}