com.pingunaut.wicket.chartjs.core.ChartBehavior.java Source code

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Here is the source code for com.pingunaut.wicket.chartjs.core.ChartBehavior.java

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/*******************************************************************************
 * Copyright 2013 Martin Spielmann
 *
 * 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.pingunaut.wicket.chartjs.core;

import org.apache.wicket.Component;
import org.apache.wicket.Session;
import org.apache.wicket.ajax.AbstractDefaultAjaxBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.markup.head.OnLoadHeaderItem;
import org.apache.wicket.protocol.http.ClientProperties;
import org.apache.wicket.protocol.http.WebSession;
import org.apache.wicket.request.resource.JavaScriptResourceReference;
import org.apache.wicket.resource.JQueryResourceReference;

/**
 * The Class ChartBehavior builds the bridge between wicket and chart.js'
 * javascript.
 *
 * @author Martin Spielmann
 */
public class ChartBehavior extends AbstractDefaultAjaxBehavior {

    private static final long serialVersionUID = 5935294904099227859L;

    /*
     * (non-Javadoc)
     *
     * @see
     * org.apache.wicket.ajax.AbstractDefaultAjaxBehavior#respond(org.apache
     * .wicket.ajax.AjaxRequestTarget)
     */
    private boolean isCanvasSupported;

    public boolean isCanvasSupported() {
        return isCanvasSupported;
    }

    public void setCanvasSupported(boolean isCanvasSupported) {
        this.isCanvasSupported = isCanvasSupported;
    }

    @Override
    protected void respond(AjaxRequestTarget target) {

    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.apache.wicket.ajax.AbstractDefaultAjaxBehavior#renderHead(org.apache
     * .wicket.Component, org.apache.wicket.markup.head.IHeaderResponse)
     */
    @Override
    public void renderHead(Component component, IHeaderResponse response) {
        super.renderHead(component, response);

        // ok, we need jQuery
        response.render(JavaScriptHeaderItem.forReference(JQueryResourceReference.get()));

        ClientProperties clientProperties = ((WebSession) Session.get()).getClientInfo().getProperties();
        boolean isIE = clientProperties.isBrowserInternetExplorer();
        boolean isLowerThan9 = clientProperties.getBrowserVersionMajor() < 9;
        isCanvasSupported = !(isIE && isLowerThan9);
        // ie lower than 9 doesn't know what to do with canvas and some js... so
        // we'll teach him...
        if (!isCanvasSupported) {
            response.render(JavaScriptHeaderItem.forReference(new JavaScriptResourceReference(
                    AbstractChartPanel.class, "modernizr-2.6.2-respond-1.1.0.min.js")));
            response.render(JavaScriptHeaderItem
                    .forReference(new JavaScriptResourceReference(AbstractChartPanel.class, "excanvas.js")));
        }

        response.render(JavaScriptHeaderItem
                .forReference(new JavaScriptResourceReference(AbstractChartPanel.class, "ChartNew.js")));
        response.render(JavaScriptHeaderItem
                .forReference(new JavaScriptResourceReference(AbstractChartPanel.class, "bridge.js")));

        // chart.js docs describe a problem with initializing canvas context
        // onDomReady in IE < 9. to avoid that, onLoad is used in that case
        // instead
        if (isCanvasSupported) {
            response.render(OnDomReadyHeaderItem.forScript("WicketCharts['" + component.getMarkupId()
                    + "']=buildChart('" + component.getMarkupId() + "');"));
        } else {
            response.render(OnLoadHeaderItem.forScript("WicketCharts['" + component.getMarkupId()
                    + "']=buildChart('" + component.getMarkupId() + "');"));

        }

        if (component.getParent() instanceof AbstractChartPanel) {
            // another IE crap... animation is deactivated for versions < 9
            // because it's not working anyway
            if (isCanvasSupported) {
                response.render(OnDomReadyHeaderItem
                        .forScript(((AbstractChartPanel) component.getParent()).generateChart()));
            } else {
                ((AbstractChartPanel) component.getParent()).getChart().getOptions().setAnimation(false);
                response.render(
                        OnLoadHeaderItem.forScript(((AbstractChartPanel) component.getParent()).generateChart()));
            }

        }
    }
}