groovy/modules/groovy-swt/src/main/groovy/swt/factory/WidgetFactory.java

/*
 * Created on Feb 15, 2004
 *
 */
package groovy.swt.factory;

import groovy.jface.impl.ApplicationWindowImpl;
import groovy.swt.SwtHelper;
import groovy.swt.convertor.ColorConverter;
import groovy.swt.convertor.PointConverter;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;

import org.codehaus.groovy.GroovyException;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Control;

/**
 * @author <a href="mailto:ckl@dacelo.nl">Christiaan ten Klooster </a>
 * @version $Revision$
 */
public class WidgetFactory extends AbstractSwtFactory implements SwtFactory {
    protected Class beanClass;
    protected int style = SWT.NONE;

    public WidgetFactory(Class beanClass) {
        this.beanClass = beanClass;
    }

    /**
     * @param beanClass2
     * @param style
     */
    public WidgetFactory(Class beanClass, int style) {
        this.beanClass = beanClass;
        this.style = style;
    }

    /*
     * @see groovy.swt.impl.Factory#newInstance(java.util.Map,
     *      java.lang.Object)
     */
    public Object newInstance(Map properties, Object parent)
    throws GroovyException {
        if (parent instanceof ApplicationWindow) {
            parent = ((ApplicationWindowImpl) parent).getContents();
        }
        String styleProperty = (String) properties.remove("style");
        if (styleProperty != null) {
            style = SwtHelper.parseStyle(SWT.class, styleProperty);
        }
        Object bean = createWidget(parent);
        if (bean != null) {
            setBeanProperties(bean, properties);
        }
        return bean;
    }

    /**
     * @param parent
     * @param bean
     * @return @throws
     *         GroovyException
     */
    protected Object createWidget(Object parent) throws GroovyException {
        if (beanClass == null) {
            throw new GroovyException(
            "No Class available to create the new widget");
        }
        try {
            if (parent == null) {
                // lets try call a constructor with a single style
                Class[] types = {
                    int.class
                };
                Constructor constructor = beanClass.getConstructor(types);
                if (constructor != null) {
                    Object[] arguments = {
                        new Integer(style)
                    };
                    return constructor.newInstance(arguments);
                }
            }
            else {
                // lets try to find the constructor with 2 arguments with the
                // 2nd argument being an int
                Constructor[] constructors = beanClass.getConstructors();
                if (constructors != null) {
                    for (int i = 0, size = constructors.length; i < size; i++) {
                        Constructor constructor = constructors[i];
                        Class[] types = constructor.getParameterTypes();
                        if (types.length == 2
                        && types[1].isAssignableFrom(int.class)) {
                            if (types[0].isAssignableFrom(parent.getClass())) {
                                Object[] arguments = {
                                        parent, 
                                        new Integer(style)
                                };
                                return constructor.newInstance(arguments);
                            }
                            // lets try to find the constructor with 1
                            // arguments
                        }
                        else if (types.length == 1
                        && types[0].isAssignableFrom(parent.getClass())) {
                            Object[] arguments = {
                                parent
                            };
                            return constructor.newInstance(arguments);
                        }
                    }
                }
            }
            return beanClass.newInstance();
        }
        catch (NoSuchMethodException e) {
            throw new GroovyException(e.getMessage());
        }
        catch (InstantiationException e) {
            throw new GroovyException(e.getMessage());
        }
        catch (IllegalAccessException e) {
            throw new GroovyException(e.getMessage());
        }
        catch (InvocationTargetException e) {
            throw new GroovyException(e.getTargetException()
            .getLocalizedMessage());
        }
    }

    protected void setBeanProperties(Object bean, Map properties) {
        if (bean instanceof Control) {
            Control control = (Control) bean;

            // set size of widget
            Object size = properties.remove("size");
            setSize(control, size);

            // set background of widget
            Object colorValue = properties.remove("background");
            Color background = getColor(control, colorValue);
            control.setBackground(background);

            // set foreground of widget
            colorValue = properties.remove("foreground");
            Color foreground = getColor(control, colorValue);
            control.setForeground(foreground);
        }

        // set the properties
        super.setBeanProperties(bean, properties);
    }

    protected void setSize(Control control, Object size) {
        Point point = null;
        if (size != null) {
            if (size instanceof Point) {
                point = (Point) size;
            }
            else if (size instanceof List) {
                point = PointConverter.getInstance().parse((List) size);
            }
            control.setSize(point);
        }
    }

    protected Color getColor(Control control, Object colorValue) {
        Color color = null;
        if (colorValue != null) {
            RGB rgb = null;
            if (colorValue instanceof Color) {
                color = (Color) colorValue;
            }
            else if (colorValue instanceof List) {
                rgb = ColorConverter.getInstance().parse((List) colorValue);
                color = new Color(control.getDisplay(), rgb);
            }
            else {
                rgb = ColorConverter.getInstance().parse(colorValue.toString());
                color = new Color(control.getDisplay(), rgb);
            }
        }
        return color;
    }
}