org.freemedsoftware.gwt.client.widget.Toaster.java Source code

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Here is the source code for org.freemedsoftware.gwt.client.widget.Toaster.java

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/*
 * $Id$
 *
 * Authors:
 *      Jeff Buchbinder <jeff@freemedsoftware.org>
 *
 * FreeMED Electronic Medical Record and Practice Management System
 * Copyright (C) 1999-2012 FreeMED Software Foundation
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.freemedsoftware.gwt.client.widget;

import java.util.HashMap;
import java.util.Iterator;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Random;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

import org.freemedsoftware.gwt.client.JsonUtil;

public class Toaster extends PopupPanel {

    public static final int TOASTER_INFO = 0;

    public static final int TOASTER_WARN = 1;

    public static final int TOASTER_ERROR = 2;

    protected HashMap<String, String> items = null;

    protected HashMap<String, HTML> itemWidgets = null;

    protected VerticalPanel container = null;

    protected int timeout = 5;

    public Toaster() {
        super(false);
        items = new HashMap<String, String>();
        itemWidgets = new HashMap<String, HTML>();
        container = new VerticalPanel();
        container.setStylePrimaryName("freemed-Toaster");
        add(container);
    }

    /**
     * Compatibility function to add TOASTER_INFO item.
     * 
     * @param module
     * @param value
     */
    public void addItem(String module, String value) {
        addItem(module, value, TOASTER_INFO);
    }

    /**
     * Add additional item to toaster.
     * 
     * @param module
     * @param value
     * @param toasterStatus
     *            TOASTER_INFO, TOASTER_WARN, TOASTER_ERROR
     */
    public void addItem(final String module1, String value, int toasterStatus) {
        final String module;
        if (items.get(module1) != null)
            module = module1 + Random.nextInt();
        else
            module = module1;
        // Add items to hash
        items.put(module, value);

        // Create new HTML segment, add
        HTML x = new HTML(value);
        x.setStylePrimaryName("freemed-ToasterItem");
        if (toasterStatus == TOASTER_INFO) {
            x.addStyleDependentName("Info");
        } else if (toasterStatus == TOASTER_WARN) {
            x.addStyleDependentName("Warning");
        } else if (toasterStatus == TOASTER_ERROR) {
            x.addStyleDependentName("Error");
        } else {
            // Do nothing, invalid
        }
        x.setTitle(module);
        x.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent evt) {
                removeItem(module);
            }
        });
        itemWidgets.put(module, x);
        container.add(x);

        // Set timer for remove
        Timer t = new Timer() {
            public void run() {
                // After timer runs out, remove object
                removeItem(module);
            }
        };
        t.schedule(timeout * 1000);

        // Make sure we're displaying
        refreshDisplay();
    }

    protected void refreshDisplay() {
        // If there are items...
        if (items.keySet().size() > 0) {
            // Set positioning at bottom left of screen
            try {
                hide();
            } catch (Exception e) {
                GWT.log("Exception", e);
            }

            // Loop through and set CSS properly
            Iterator<String> ks = items.keySet().iterator();
            while (ks.hasNext()) {
                final String k = (String) ks.next();
                if (!ks.hasNext()) {
                    // If this is the last one, set to special
                    ((HTML) itemWidgets.get(k)).setStylePrimaryName("freemed-ToasterItem-Last");
                } else {
                    // Otherwise regular style
                    ((HTML) itemWidgets.get(k)).setStylePrimaryName("freemed-ToasterItem");
                }
            }

            try {
                setPopupPositionAndShow(new PopupPanel.PositionCallback() {
                    public void setPosition(int offsetWidth, int offsetHeight) {
                        int left = (Window.getClientWidth() - offsetWidth) - 5;
                        int top = (Window.getClientHeight() - offsetHeight) - 5;
                        setPopupPosition(left, top + Window.getScrollTop());
                    }
                });

            } catch (Exception e) {
                GWT.log("Exception attempting to popup toaster", e);
            }
        } else {
            hide();
        }
    }

    /**
     * Remove item from toaster.
     * 
     * @param module
     */
    public void removeItem(String module) {
        try {
            container.remove((Widget) itemWidgets.get(module));
        } catch (Exception e) {
            JsonUtil.debug(e.toString());
        }
        try {
            itemWidgets.remove(module);
        } catch (Exception e) {
            JsonUtil.debug(e.toString());
        }
        try {
            items.remove(module);
        } catch (Exception e) {
            JsonUtil.debug(e.toString());
        }

        // Refresh
        refreshDisplay();
    }

    /**
     * Set timeout for items, after which time they disappear.
     * 
     * @param seconds
     */
    public void setTimeout(int seconds) {
        if (timeout > 0) {
            timeout = seconds;
        }
    }

}