com.urlisit.siteswrapper.cloud.widgets.ImageLogo.java Source code

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Here is the source code for com.urlisit.siteswrapper.cloud.widgets.ImageLogo.java

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/* Copyright 2014 URL IS/IT
 * 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 com.urlisit.siteswrapper.cloud.widgets;

import java.math.BigDecimal;
import java.math.MathContext;

import com.google.gwt.event.dom.client.LoadEvent;
import com.google.gwt.event.dom.client.LoadHandler;
import com.google.gwt.event.logical.shared.AttachEvent;
import com.google.gwt.safehtml.shared.UriUtils;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Image;
import com.urlisit.siteswrapper.cloud.view.View;

/**
 * @author url
 *
 */
public class ImageLogo implements AttachEvent.Handler {

    private View view;
    private final Image logo = new Image();
    private boolean loaded;
    private Timer timer;
    private BigDecimal leftPercent;
    private BigDecimal topPercent;
    private BigDecimal widthPercent;
    private BigDecimal oldWidth;
    private BigDecimal oldHeight;
    private BigDecimal newWidth;
    private BigDecimal newHeight;

    /**
     * 
     */
    public ImageLogo(View view) {
        this.view = view;
        leftPercent = BigDecimal.valueOf(Double.parseDouble(view.getLookAndFeel().getLogoLeftPercent()));
        topPercent = BigDecimal.valueOf(Double.parseDouble(view.getLookAndFeel().getLogoTopPercent()));
        widthPercent = BigDecimal.valueOf(Double.parseDouble(view.getLookAndFeel().getLogoWidthPercent()));
        //logo.setVisible(false);
        loaded = false;
        logo.getElement().getStyle().setOpacity(Double.valueOf(view.getLiterals().zero()));
        logo.addLoadHandler(new LoadHandler() {
            @Override
            public void onLoad(LoadEvent event) {
                //logo.setVisible(true);
                loaded = true;
                resize();
                fadeIn();
            }
        });
        view.getPanel().add(logo);
        logo.setUrl(UriUtils.fromString(view.getPage().getLogoImage()));
    }

    public void resize() {
        if (isLoaded()) {
            int left = leftPercent.multiply(BigDecimal.valueOf(Double.valueOf(Window.getClientWidth()))).intValue();
            int top = topPercent.multiply(BigDecimal.valueOf(Double.valueOf(Window.getClientHeight()))).intValue();
            newWidth = widthPercent.multiply(BigDecimal.valueOf(Double.valueOf(Window.getClientWidth())));
            oldWidth = BigDecimal.valueOf(Integer.valueOf(logo.getWidth()).doubleValue());
            oldHeight = BigDecimal.valueOf(Integer.valueOf(logo.getHeight()).doubleValue());
            newHeight = newWidth.multiply(oldWidth.divide(oldHeight, 4, BigDecimal.ROUND_HALF_EVEN));
            logo.setPixelSize(newWidth.intValue(), newHeight.intValue());
            view.getPanel().setWidgetPosition(logo, left, top);
        } else {
            logo.addLoadHandler(new LoadHandler() {
                @Override
                public void onLoad(LoadEvent event) {
                    //logo.setVisible(true);
                    loaded = true;
                    resize();
                }
            });
        }
    }

    public void fadeIn() {
        int interval = 15;
        timer = new Timer() {
            BigDecimal current = new BigDecimal(0.0, MathContext.DECIMAL32);
            BigDecimal increment = new BigDecimal(0.1, MathContext.DECIMAL32);

            @Override
            public void run() {
                if (current.doubleValue() <= BigDecimal.ONE.doubleValue()) {
                    logo.getElement().getStyle().setOpacity(current.doubleValue());
                    current = current.add(increment, MathContext.DECIMAL32);
                } else {
                    timer.cancel();
                }
            }
        };
        timer.scheduleRepeating(interval);
    }

    public void fadeOut() {
        int stepInterval = 15;
        timer = new Timer() {
            BigDecimal current = new BigDecimal(1.0, MathContext.DECIMAL32);
            BigDecimal decrement = new BigDecimal(0.1, MathContext.DECIMAL32);

            @Override
            public void run() {
                if (current.doubleValue() >= BigDecimal.ZERO.doubleValue()) {
                    logo.getElement().getStyle().setOpacity(current.doubleValue());
                    current = current.subtract(decrement, MathContext.DECIMAL32);
                } else {
                    timer.cancel();
                }
            }
        };
        timer.scheduleRepeating(stepInterval);
    }

    public boolean isLoaded() {
        return loaded;
    }

    @Override
    public void onAttachOrDetach(AttachEvent event) {
        if (event.isAttached()) {
            fadeIn();
        } else {
            fadeOut();
        }
    }

}