org.dawb.workbench.ui.data.PlotDataChooseDialog.java Source code

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Here is the source code for org.dawb.workbench.ui.data.PlotDataChooseDialog.java

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/*
 * Copyright (c) 2012 Diamond Light Source Ltd.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.dawb.workbench.ui.data;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.dawnsci.slicing.api.data.ITransferableDataObject;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
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.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

/**
 * Class for choosing error on a plotted dataset.
 * 
 * Can be used for setting error for instance.
 * 
 * @author Matthew Gerring
 *
 */
class PlotDataChooseDialog extends Dialog {

    private List<ITransferableDataObject> plottedSelections;
    private ITransferableDataObject error, selection;

    public PlotDataChooseDialog(Shell parentShell) {
        super(parentShell);
        setShellStyle(getShellStyle() | SWT.RESIZE);
    }

    public void init(List<ITransferableDataObject> selections, ITransferableDataObject error) {
        this.plottedSelections = selections;
        this.error = error;
        this.selection = selections.get(0); // Throws index and NPE if selections empty or null.
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        // create a composite with standard margins and spacing
        Composite composite = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout(2, false);
        layout.marginHeight = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);
        layout.marginWidth = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);
        layout.verticalSpacing = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);
        layout.horizontalSpacing = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
        composite.setLayout(layout);
        composite.setLayoutData(new GridData(GridData.FILL_BOTH));
        applyDialogFont(composite);

        // Add a choice list to choose the existing data. 
        Label label = new Label(composite, SWT.WRAP);
        label.setText(
                "Please choose the plotted data to which the error '" + error.getName() + "' should be assigned.");
        label.setLayoutData(new GridData(SWT.FILL, SWT.TOP, false, false, 2, 1));

        label = new Label(composite, SWT.WRAP);
        label.setText("Plotted data ");
        label.setLayoutData(new GridData(SWT.LEFT, SWT.TOP, false, false));

        final Combo combo = new Combo(composite, SWT.READ_ONLY | SWT.BORDER);
        combo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
        combo.setItems(getSelectionNames());
        combo.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                final String name = combo.getItem(combo.getSelectionIndex());
                selection = getSelectionByName(name);
            }
        });
        combo.select(0);

        return composite;
    }

    protected ITransferableDataObject getSelectionByName(String name) {
        for (ITransferableDataObject ob : plottedSelections) {
            if (name.equals(ob.getName()))
                return ob;
        }
        return null;
    }

    private String[] getSelectionNames() {
        final List<String> names = new ArrayList<String>(plottedSelections.size());
        for (ITransferableDataObject ob : plottedSelections)
            names.add(ob.getName());
        return names.toArray(new String[names.size()]);
    }

    /**
     * Opens the dialog and returns the chosen ICheckableObject or
     * null if none was selected.
     * @return
     */
    public ITransferableDataObject choose() {

        final int ok = open();
        if (ok == Dialog.OK)
            return selection;
        return null;
    }

}