org.swtchart.ext/src/org/swtchart/ext/internal/properties/AbstractSelectorPage.java

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package org.swtchart.ext.internal.properties;

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.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.List;
import org.swtchart.ext.InteractiveChart;

abstract public class AbstractSelectorPage extends AbstractPage {

    protected List list;

    private String selector;

    private boolean selectorEnabled;

    protected int selectedIndex;

    public AbstractSelectorPage(InteractiveChart chart,
            PropertiesResources resources, String title, String selector) {
        super(chart, resources, title);
        this.selector = selector;
        selectedIndex = 0;
        selectorEnabled = true;
    }

    /*
     * @see PreferencePage#createContents(Composite)
     */
    @Override
    protected Control createContents(Composite parent) {
        String[] items = getListItems();
        if (items.length < 2) {
            selectorEnabled = false;
        }

        Composite composite = new Composite(parent, SWT.NONE);
        if (selectorEnabled) {
            GridLayout layout = new GridLayout(3, true);
            layout.marginHeight = 0;
            layout.marginWidth = 0;
            composite.setLayout(layout);

            Label label = new Label(composite, SWT.NULL);
            label.setText(selector);
            GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
            gridData.horizontalSpan = 3;
            label.setLayoutData(gridData);

            addLeftPanel(composite, items);
            addRightPanel(composite);
        } else {
            GridLayout layout = new GridLayout(1, true);
            layout.marginHeight = 0;
            layout.marginWidth = 0;
            composite.setLayout(layout);
            addRightPanelContents(composite);
        }

        selectInitialValues();
        updateControlSelections();

        return composite;
    }

    abstract protected String[] getListItems();

    abstract protected void selectInitialValues();

    private void addLeftPanel(Composite parent, String[] items) {
        Composite leftPanel = new Composite(parent, SWT.NULL);
        GridData gridData = new GridData(GridData.FILL_BOTH);
        gridData.horizontalSpan = 1;
        leftPanel.setLayoutData(gridData);

        GridLayout layout = new GridLayout(1, false);
        layout.marginHeight = 0;
        layout.marginWidth = 0;
        leftPanel.setLayout(layout);

        list = new List(leftPanel, SWT.BORDER);
        GridData gridData2 = new GridData(GridData.FILL_BOTH);
        gridData2.horizontalSpan = 1;
        list.setLayoutData(gridData2);
        for (String item : items) {
            list.add(item);
        }

        list.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                selectedIndex = list.getSelectionIndex();
                updateControlSelections();
            }
        });
        list.select(0);
    }

    private void addRightPanel(Composite parent) {
        Composite rightPanel = new Composite(parent, SWT.NULL);
        GridData gridData = new GridData(GridData.FILL_BOTH);
        gridData.horizontalSpan = 2;
        rightPanel.setLayoutData(gridData);
        rightPanel.setLayout(new GridLayout(1, false));

        addRightPanelContents(rightPanel);
    }

    abstract protected void addRightPanelContents(Composite parent);

    abstract protected void updateControlSelections();
}

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