BnLabelDecorator.java

/*
 * Beanfabrics Framework Copyright (C) by Michael Karneim, beanfabrics.org
 * Use is subject to license terms. See license.txt.
 */
package org.beanfabrics.swt;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import org.beanfabrics.IModelProvider;
import org.beanfabrics.Link;
import org.beanfabrics.ModelSubscriber;
import org.beanfabrics.Path;
import org.beanfabrics.View;
import org.beanfabrics.event.WeakPropertyChangeListener;
import org.beanfabrics.model.ITextPM;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;

/**
 * @author Michael Karneim
 */
public class BnLabelDecorator extends AbstractDecorator<Label> implements View<ITextPM>, ModelSubscriber {
    private final Link link = new Link(this);
    private final PropertyChangeListener listener = new WeakPropertyChangeListener() {
        public void propertyChange(PropertyChangeEvent evt) {
            refreshUI();
        }
    };

    private ValidationIndicator validationIndicator;
    private ITextPM pModel;
    private Label label;

    public BnLabelDecorator(Label label) {
        super(label);
        this.label = label;
        hookControl(label);
    }

    private void hookControl(Label label) {
        Composite parent = label.getParent();
        if (parent instanceof ValidationIndicator) {
            setValidationIndicator((ValidationIndicator)parent);
        }
        refreshUI();
    }

    public BnLabelDecorator(Composite parent, int style) {
        this(new Label(parent, style));
    }

    /** {@inheritDoc} */
    public ITextPM getPresentationModel() {
        return pModel;
    }

    /** {@inheritDoc} */
    public void setPresentationModel(ITextPM pModel) {
        if (this.pModel != null) {
            this.pModel.removePropertyChangeListener(listener);
        }
        this.pModel = pModel;
        if (this.pModel != null) {
            this.pModel.addPropertyChangeListener(listener);
        }
        refreshUI();
    }

    protected void refreshUI() {

        refreshText();
        refreshTooltip();
        refreshValidationIndicator();
    }

    protected void refreshText() {
        if (pModel != null) {
            if (!label.getText().equals(pModel.getText())) {
                label.setText(pModel.getText());
            }
        } else {
            label.setText("");
        }
    }

    protected void refreshTooltip() {
        if (pModel != null) {
            if (pModel.isValid() == false) {
                label.setToolTipText(pModel.getValidationState().getMessage());
            } else {
                label.setToolTipText(pModel.getDescription());
            }
        } else {
            label.setToolTipText(null);
        }
    }

    protected void refreshValidationIndicator() {
        if (validationIndicator != null) {
            if (pModel != null) {
                validationIndicator.setValidationState(pModel.getValidationState());
            } else {
                validationIndicator.setValidationState(null);
            }
        }
    }

    /** {@inheritDoc} */
    public void setModelProvider(IModelProvider provider) {
        this.link.setModelProvider(provider);
    }

    /** {@inheritDoc} */
    public IModelProvider getModelProvider() {
        return link.getModelProvider();
    }

    /** {@inheritDoc} */
    public void setPath(Path path) {
        this.link.setPath(path);
    }

    /** {@inheritDoc} */
    public Path getPath() {
        return link.getPath();
    }

    public ValidationIndicator getValidationIndicator() {
        return validationIndicator;
    }

    public void setValidationIndicator(ValidationIndicator validationIndicator) {
        this.validationIndicator = validationIndicator;
    }
}