org.geomajas.gwt2.plugin.print.client.event.DefaultPrintRequestHandler.java Source code

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Here is the source code for org.geomajas.gwt2.plugin.print.client.event.DefaultPrintRequestHandler.java

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/*
 * This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
 *
 * Copyright 2008-2014 Geosparc nv, http://www.geosparc.com/, Belgium.
 *
 * The program is available in open source according to the GNU Affero
 * General Public License. All contributions in this program are covered
 * by the Geomajas Contributors License Agreement. For full licensing
 * details, see LICENSE.txt in the project root.
 */

package org.geomajas.gwt2.plugin.print.client.event;

import org.geomajas.gwt2.plugin.print.client.event.PrintFinishedInfo.HttpMethod;
import org.geomajas.gwt2.plugin.print.client.util.UrlBuilder;

import com.google.gwt.dom.client.Style;
import com.google.gwt.event.dom.client.LoadEvent;
import com.google.gwt.event.dom.client.LoadHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.Frame;
import com.google.gwt.user.client.ui.Hidden;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * Default implementation of {@link PrintRequestHandler}. It will do nothing on a {@link PrintRequestStartedEvent}. On a
 * {@link PrintRequestFinishedEvent}, it open or download the printed document, depending on the event information.
 *
 * @author Jan Venstermans
 */
public class DefaultPrintRequestHandler implements PrintRequestHandler {

    @Override
    public void onPrintRequestStarted(PrintRequestStartedEvent event) {
        // do nothing
    }

    @Override
    public void onPrintRequestFinished(PrintRequestFinishedEvent event) {
        PrintFinishedInfo info = event.getPrintFinishedInfo();
        if (info.getMethod() == HttpMethod.GET) {
            switch (info.getPostPrintAction()) {
            case SAVE:
                createHiddenFrame(info);
                break;
            case OPEN:
            default:
                UrlBuilder builder = new UrlBuilder(info.getUrl());
                for (String name : info.getParams().keySet()) {
                    builder.addParameter(name, info.getParams().get(name));
                }
                Window.open(builder.toString(), "_blank", null);
                break;
            }
        } else {
            createHiddenForm(info);
        }
    }

    private void createHiddenForm(PrintFinishedInfo info) {
        final FormPanel panel;
        switch (info.getPostPrintAction()) {
        case SAVE:
            panel = new FormPanel();
            break;
        case OPEN:
        default:
            panel = new FormPanel("_blank");
            break;
        }
        panel.setVisible(false);
        panel.setPixelSize(0, 0);
        panel.setAction(info.getUrl());
        panel.setMethod(FormPanel.METHOD_POST);
        FlowPanel fieldsPanel = new FlowPanel();
        panel.add(fieldsPanel);
        for (String name : info.getParams().keySet()) {
            fieldsPanel.add(new Hidden(name, info.getParams().get(name)));
        }
        panel.getElement().getStyle().setPosition(Style.Position.ABSOLUTE);
        panel.getElement().getStyle().setBorderWidth(0, Style.Unit.PX);
        RootPanel.get().add(panel);
        panel.submit();
    }

    private void createHiddenFrame(PrintFinishedInfo info) {
        final Frame frame = new Frame();
        frame.setVisible(false);
        UrlBuilder builder = new UrlBuilder(info.getUrl());
        for (String name : info.getParams().keySet()) {
            builder.addParameter(name, info.getParams().get(name));
        }
        frame.setUrl(builder.toString());
        frame.setPixelSize(0, 0);
        frame.getElement().getStyle().setPosition(Style.Position.ABSOLUTE);
        frame.getElement().getStyle().setBorderWidth(0, Style.Unit.PX);
        frame.addLoadHandler(new LoadHandler() {

            @Override
            public void onLoad(LoadEvent event) {
                frame.removeFromParent();
            }
        });
        RootPanel.get().add(frame);
    }
}