net.dancioi.jcsphotogallery.client.view.desktop.ViewHandlers.java Source code

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Here is the source code for net.dancioi.jcsphotogallery.client.view.desktop.ViewHandlers.java

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/*   
 *    File    : ViewHandlers.java
 * 
 *    Copyright (C) 2012 Daniel Cioi <dan@dancioi.net>
 *                              
 *   www.dancioi.net/projects/Jcsphotogallery
 *
 *   This file is part of Jcsphotogallery.
 *
 *  Jcsphotogallery 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  Jcsphotogallery 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 Jcsphotogallery.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package net.dancioi.jcsphotogallery.client.view.desktop;

import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.Window.ScrollEvent;
import com.google.gwt.user.client.Window.ScrollHandler;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * App's handlers.
 * 
 * @author Daniel Cioi <dan@dancioi.net>
 * @version $Revision$ Last modified: $Date$, by: $Author$
 */
public class ViewHandlers {

    private BottomPanel bottomPanel;
    private VersionPanel versionPanel;
    private int currentScrollPosition = 0;
    private String browser;

    public ViewHandlers(BottomPanel bottomPanel, VersionPanel versionPanel) {
        this.bottomPanel = bottomPanel;
        this.versionPanel = versionPanel;
        browser = getUserAgent();
        addResizeBrowserListener();
    }

    private native String getUserAgent() /*-{
                                         return $wnd.navigator.appName;
                                         }-*/;

    private void addResizeBrowserListener() {
        keepBottomPanelVisible(Window.getClientWidth(), Window.getClientHeight(), currentScrollPosition);

        Window.addResizeHandler(new ResizeHandler() {

            @Override
            public void onResize(ResizeEvent event) {
                keepBottomPanelVisible(event.getWidth(), event.getHeight(), currentScrollPosition);
            }

        });

        Window.addWindowScrollHandler(new ScrollHandler() {

            @Override
            public void onWindowScroll(ScrollEvent event) {
                currentScrollPosition = event.getScrollTop();
                keepBottomPanelVisible(Window.getClientWidth(), Window.getClientHeight() + event.getScrollTop(), 0);
            }
        });
    }

    /*
     * keeps the bottom panel (control) always visible (for screens with low resolution).
     */
    private void keepBottomPanelVisible(int width, int height, int scrollPosition) {
        int heightLimit = 810; // in mozilla firefox should be 795, otherwise IE and Chrome are ok.
        if (browser.contains("firefox")) {
            heightLimit = 795;
        }
        // GWT.log("height = " + height);
        if (height < heightLimit) {
            RootPanel.get("bottomPanel").setWidgetPosition(bottomPanel, width / 2 - 400 + 5,
                    height - 40 + scrollPosition);
        } else {
            RootPanel.get("bottomPanel").setWidgetPosition(bottomPanel, width / 2 - 400 + 5, heightLimit - 40);
            RootPanel.get("versionPanel").setWidgetPosition(versionPanel, width / 2 - 400 + 5, heightLimit);
        }
    }

}