org.glom.web.client.ui.cell.NumericCell.java Source code

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Here is the source code for org.glom.web.client.ui.cell.NumericCell.java

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/*
 * Copyright (C) 2011 Openismus GmbH
 *
 * This file is part of GWT-Glom.
 *
 * GWT-Glom is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * GWT-Glom 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with GWT-Glom.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.glom.web.client.ui.cell;

import org.glom.web.client.StringUtils;
import org.glom.web.shared.libglom.Field.GlomFieldType;

import com.google.gwt.cell.client.AbstractCell;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;

/**
 * Cell renderer for {@link GlomFieldType} TYPE_NUMERIC.
 */
public class NumericCell extends AbstractCell<Double> {
    private SafeHtml colorCSSProp;
    private SafeHtml backgroundColorCSSProp;
    private final NumberFormat numberFormat;
    private final boolean useAltColorForNegatives;
    private final String currencyCode;

    // TODO Find a way to set the colors on the whole column
    public NumericCell(final String foregroundColor, final String backgroundColor, final NumberFormat numberFormat,
            final boolean useAltColorForNegatives, final String currencyCode) {
        if (!StringUtils.isEmpty(foregroundColor)) {
            colorCSSProp = SafeHtmlUtils.fromString("color:" + foregroundColor + ";");
        } else {
            colorCSSProp = SafeHtmlUtils.fromSafeConstant("");
        }
        if (!StringUtils.isEmpty(backgroundColor)) {
            backgroundColorCSSProp = SafeHtmlUtils.fromString("background-color:" + backgroundColor + ";");
        } else {
            backgroundColorCSSProp = SafeHtmlUtils.fromSafeConstant("");
        }
        this.numberFormat = numberFormat;
        this.useAltColorForNegatives = useAltColorForNegatives;
        this.currencyCode = StringUtils.isEmpty(currencyCode) ? "" : currencyCode + " ";
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.google.gwt.cell.client.AbstractCell#render(com.google.gwt.cell.client.Cell.Context, java.lang.Object,
     * com.google.gwt.safehtml.shared.SafeHtmlBuilder)
     */
    @Override
    public void render(final Context context, final Double value, final SafeHtmlBuilder sb) {
        if (value == null) {
            // The value is from an empty row.
            sb.appendHtmlConstant("&nbsp;");
            return;
        }

        // set the foreground color to red if the number is negative and this is requested
        if (useAltColorForNegatives && value.doubleValue() < 0) {
            // The default alternative color in libglom is red.
            colorCSSProp = SafeHtmlUtils.fromString("color: #FF0000;");
        }

        // Convert the number to a string and set some CSS properties on the text.
        // The overflow and text-overflow properties tell the browser to add an ellipsis when the text overflows the
        // table cell.
        // FIXME this isn't using safe html correctly!
        sb.appendHtmlConstant("<div style=\"overflow: hidden; text-overflow: ellipsis; " + colorCSSProp.asString()
                + backgroundColorCSSProp.asString() + "\">");
        sb.append(SafeHtmlUtils.fromString(currencyCode + numberFormat.format(value)));
        sb.appendHtmlConstant("</div>");

    }
}