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

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package org.swtchart.ext.internal.properties;

import org.eclipse.jface.preference.ColorSelector;
import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Spinner;
import org.eclipse.swt.widgets.Text;
import org.swtchart.ext.InteractiveChart;

public abstract class AbstractPage extends PreferencePage {

    protected InteractiveChart chart;

    protected PropertiesResources resources;

    public AbstractPage(InteractiveChart chart,
            PropertiesResources resources, String title) {
        this.chart = chart;
        this.resources = resources;
        setTitle(title);
    }

    /*
     * @see PreferencePage#performOk()
     */
    @Override
    public boolean performOk() {
        if (getControl() != null) {
            apply();
            chart.redraw();
        }
        return true;
    }

    abstract public void apply();

    protected Group createGroupControl(Composite parent, String text,
            boolean equal) {
        Group group = new Group(parent, SWT.NULL);
        group.setText(text);

        group.setLayout(new GridLayout(2, equal));
        group.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

        return group;
    }

    protected Label createLabelControl(Composite parent, String text) {
        Label label = new Label(parent, SWT.NULL);
        label.setText(text);

        GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
        gridData.horizontalSpan = 1;
        label.setLayoutData(gridData);

        return label;
    }

    protected ColorSelector createColorButtonControl(Composite parent) {
        return new ColorSelector(parent);
    }

    protected Button createCheckBoxControl(Composite parent, String label) {
        Composite composite = new Composite(parent, SWT.NULL);
        GridData gridData = new GridData();
        gridData.horizontalSpan = 2;
        composite.setLayoutData(gridData);
        composite.setLayout(new GridLayout(2, false));

        Button button = new Button(composite, SWT.CHECK);
        GridData gridData1 = new GridData();
        gridData1.horizontalSpan = 1;
        button.setLayoutData(gridData1);

        createLabelControl(composite, label);

        return button;
    }

    protected Text createTextControl(Composite parent) {
        Text text = new Text(parent, SWT.BORDER | SWT.SINGLE);

        GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
        gridData.horizontalSpan = 1;
        text.setLayoutData(gridData);

        return text;
    }

    protected Combo createComboControl(Composite parent, String[] items) {
        Combo combo = new Combo(parent, SWT.BORDER | SWT.SINGLE);
        combo.setItems(items);

        GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
        gridData.horizontalSpan = 1;
        combo.setLayoutData(gridData);

        return combo;
    }

    protected Spinner createSpinnerControl(Composite parent, int min, int max) {
        Spinner spinner = new Spinner(parent, SWT.BORDER);
        spinner.setMinimum(min);
        spinner.setMaximum(max);

        GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
        gridData.horizontalSpan = 1;
        spinner.setLayoutData(gridData);

        return spinner;
    }
}

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