org.polymap.p4.process.BoundingBoxSupplier.java Source code

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Here is the source code for org.polymap.p4.process.BoundingBoxSupplier.java

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/* 
 * polymap.org
 * Copyright (C) 2017, the @authors. All rights reserved.
 *
 * This 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 3.0 of
 * the License, or (at your option) any later version.
 *
 * This software 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.
 */
package org.polymap.p4.process;

import java.util.concurrent.atomic.AtomicReference;

import java.text.NumberFormat;

import org.geotools.geometry.jts.ReferencedEnvelope;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;

import org.polymap.core.data.process.ui.FieldViewerSite;
import org.polymap.core.data.process.ui.InputFieldSupplier;
import org.polymap.core.runtime.Polymap;
import org.polymap.core.ui.FormDataFactory;
import org.polymap.core.ui.FormLayoutFactory;
import org.polymap.core.ui.UIUtils;

import org.polymap.rhei.batik.toolkit.SimpleDialog;

/**
 * Supplies a {@link ReferencedEnvelope}.
 *
 * @author Falko Brutigam
 */
public class BoundingBoxSupplier extends InputFieldSupplier {

    private static final Log log = LogFactory.getLog(BoundingBoxSupplier.class);

    private NumberFormat nf;

    private Button btn;

    public BoundingBoxSupplier() {
        nf = NumberFormat.getNumberInstance(Polymap.getSessionLocale());
        nf.setMaximumIntegerDigits(100);
        nf.setMaximumFractionDigits(2);
        nf.setMinimumIntegerDigits(1);
        nf.setMinimumFractionDigits(2);
    }

    @Override
    public String label() {
        return "Bounds";
    }

    @Override
    public boolean init(@SuppressWarnings("hiding") FieldViewerSite site) {
        return super.init(site) && ReferencedEnvelope.class.isAssignableFrom(site.fieldInfo.get().type.get());
    }

    @Override
    public void createContents(Composite parent) {
        // shadows
        parent.setLayout(FormLayoutFactory.defaults().margins(1, 2, 3, 2).create());

        btn = new Button(parent, SWT.PUSH);
        btn.setText("SELECT...");
        btn.setToolTipText("Select a bounding box from a map");
        btn.addSelectionListener(UIUtils.selectionListener(ev -> {
            openBoundingBoxMap();
        }));
        FormDataFactory.on(btn).fill();
    }

    protected void openBoundingBoxMap() {
        SimpleDialog dialog = new SimpleDialog();
        dialog.title.put("Bounding box");
        dialog.addCancelAction();

        AtomicReference<ReferencedEnvelope> bounds = new AtomicReference();
        dialog.setContents(parent -> {
            parent.setLayout(FormLayoutFactory.defaults().create());
            BoundingBoxMapViewer mapViewer = new BoundingBoxMapViewer(parent, site.getFieldValue()) {
                @Override
                protected void onBoundingBox(ReferencedEnvelope newBounds) {
                    bounds.set(newBounds);
                }
            };
            FormDataFactory.on(mapViewer.getControl()).fill().width(450).height(400);
        });
        dialog.addOkAction(() -> {
            onBounds(bounds.get());
            dialog.close();
            return true;
        });
        dialog.open();
    }

    protected void onBounds(ReferencedEnvelope bounds) {
        log.info("" + bounds);
        site.setFieldValue(bounds);

        StringBuilder buf = new StringBuilder(256).append(nf.format(bounds.getMinX())).append(":")
                .append(nf.format(bounds.getMaxX())).append(" - ").append(nf.format(bounds.getMinY())).append(":")
                .append(nf.format(bounds.getMaxY()));
        btn.setText(buf.toString());
        btn.setToolTipText(buf.toString());
    }

}