URLDialog.java

package bndtools.shared;

import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;

import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class URLDialog extends TitleAreaDialog {

    private String locationStr = null;
    private URI location = null;
    private String name = null;
    private final String title;
    private final boolean named;

    public URLDialog(Shell parentShell, String title) {
        this(parentShell, title, true);
    }

    public URLDialog(Shell parentShell, String title, boolean named) {
        super(parentShell);
        this.title = title;
        this.named = named;
        setShellStyle(getShellStyle() | SWT.RESIZE);
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        setTitle(title);

        Composite area = (Composite) super.createDialogArea(parent);
        Composite container = new Composite(area, SWT.NONE);
        container.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

        GridLayout gl = new GridLayout(3, false);
        container.setLayout(gl);

        Label lblUrl = new Label(container, SWT.NONE);
        lblUrl.setText("URL:");

        final Text txtUrl = new Text(container, SWT.BORDER);
        txtUrl.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
        txtUrl.addModifyListener(new ModifyListener() {
            @Override
            public void modifyText(ModifyEvent ev) {
                locationStr = txtUrl.getText();
                updateFromInput();
            }
        });

        Button btnBrowseFile = new Button(container, SWT.PUSH);
        btnBrowseFile.setText("Local File");
        btnBrowseFile.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                FileDialog fileDialog = new FileDialog(getShell(), SWT.OPEN);
                String path = fileDialog.open();
                if (path != null) {
                    File file = new File(path);
                    URI fileUri = file.toURI();
                    txtUrl.setText(fileUri.toString());
                }
            }
        });

        if (named) {
            new Label(container, SWT.NONE).setText("Name:");
            final Text txtName = new Text(container, SWT.BORDER);
            txtName.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
            @SuppressWarnings("unused")
            Label lblSpacer1 = new Label(container, SWT.NONE); // spacer

            txtName.addModifyListener(new ModifyListener() {
                @Override
                public void modifyText(ModifyEvent ev) {
                    name = txtName.getText();
                }
            });
        }

        // Listeners
        // Load from state
        if (location != null)
            txtUrl.setText(location.toString());

        return area;
    }

    @Override
    protected void createButtonsForButtonBar(Composite parent) {
        super.createButtonsForButtonBar(parent);

        Button ok = getButton(OK);
        ok.setText("Add");
        ok.setEnabled(location != null);
    }

    private void updateFromInput() {
        try {
            location = new URI(locationStr);
            setErrorMessage(null);
            getButton(OK).setEnabled(true);
        } catch (URISyntaxException e) {
            setErrorMessage(e.getMessage());
            getButton(OK).setEnabled(false);
        }
    }

    public URI getLocation() {
        return location;
    }

    public String getName() {
        return name;
    }

}