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src / branches / dev-hh-2 / ValidationAPI / src / org / netbeans / validation / api / ui / swing / SwingValidationGroup.java

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package org.netbeans.validation.api.ui.swing;

import java.awt.Component;
import org.netbeans.validation.api.ui.*;
import java.awt.EventQueue;
import java.awt.Point;
import javax.swing.AbstractButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.Popup;
import javax.swing.text.JTextComponent;
import org.netbeans.validation.api.Problem;
import org.netbeans.validation.api.Validator;

/**
 * {@link ValidationGroup} subclass specialized for handling Swing
 * components.  This subclass has {@code add}-methods for adding
 * GUI-components for common Swing cases. There are also a method for
 * getting the {@link SwingComponentDecorationFactory} used by this
 * SwingValidationGroup to create decorations for the separate
 * GUI-components added to the group. A custom {@code SwingComponentDecorationFactory}
 * can be specified when creating the {@code SwingValidationGroup}.
 *
 * <p> For components this library supports out-of-the-box such as
 * <code>JTextField</code>s or <code>JComboBox</code>es, simply call
 * one of the <code>add()</code> methods with your component and
 * validators.  For validating your own components or ones this class
 * doesn't have methods for, you implement {@link ValidationListener}s, and add them
 * to the {@code ValidationGroup} using the the method
 * {@link ValidationGroup#add(org.netbeans.validation.api.ui.ValidationItem)}
 */
public final class SwingValidationGroup extends ValidationGroup {
    private final SwingComponentDecorationFactory decorator;


    public static SwingValidationGroup create(ValidationUI... ui) {
        assert EventQueue.isDispatchThread() : "Must be called on event thread";
        return new SwingValidationGroup(null, null, ui);
    }
    
    /**
     * Creates a {@code SwingValidationGroup}.
     *
     * Will use a {@code SwingComponentDecorationFactory} returned by {@link SwingComponentDecorationFactory#get()} to modify the appearance of
     * subsequently added components (to show that there is a problem with a
     * component's content). To instead use a custom {@code SwingComponentDecorationFactory}, call
     * {@link #create(org.netbeans.validation.api.ui.GroupValidator, org.netbeans.validation.api.ui.swing.SwingComponentDecorationFactory, org.netbeans.validation.api.ui.ValidationUI[]) }
     *
     * @param ui Zero or more {@code ValidationUI}:s. Will be used by the {@code SwingValidationGroup} to show the leading problem (if any)
     */
    public static SwingValidationGroup create(GroupValidator additionalGroupValidation, ValidationUI... ui) {
        assert EventQueue.isDispatchThread() : "Must be called on event thread";
        return new SwingValidationGroup(additionalGroupValidation, null, ui);
    }


    /**
     * Creates a {@code SwingValidationGroup}.
     * @param additionalGroupValidation may be null
     * @param ui Zero or more {@code ValidationUI}:s. Will all be used by the
     * {@code SwingValidationGroup} to show the leading problem (if any)
     * @param decorator A decorator to be used to modify the appearance of 
     * subsequently added components (to show that there is a problem with a
     * component's content).
     */
    public static SwingValidationGroup create(GroupValidator additionalGroupValidation, SwingComponentDecorationFactory decorator, ValidationUI... ui) {
        assert EventQueue.isDispatchThread() : "Must be called on event thread";
        return new SwingValidationGroup(additionalGroupValidation, decorator, ui);
    }


    private SwingValidationGroup(GroupValidator additionalGroupValidation, SwingComponentDecorationFactory decorator, ValidationUI... ui) {
        super(additionalGroupValidation, ui);
        if (ui == null) {
            throw new NullPointerException();
        }
        this.decorator = ( decorator!=null ? decorator : SwingComponentDecorationFactory.get() );
    }


    /**
     * Gets the currently set component decorator used to modify
     * components appearance (to show that there is a problem with a
     * component's content).
     * @return decorator A decorator. May not be null.
     */
    public SwingComponentDecorationFactory getComponentDecorationFactory() {
        return decorator;
    }



    /**
     * Add a text component to be validated using the passed validators.
     *
     * <p> When a problem occurs, the created ValidationListener will
     * use a {@link ValidationUI} created by this {@code ValidationGroup} to decorate
     * the component.
     *
     * <p> <b>Note:</b> All methods in this class must be called from
     * the AWT Event Dispatch thread, or assertion errors will be
     * thrown.  Manipulating components on other threads is not safe.
     *
     * <p> Swing {@code Document}s (the model used by JTextComponent)
     * are thread-safe, and can be modified from other threads.  In
     * the case that a text component validator receives an event on
     * another thread, validation will be scheduled for later,
     * <i>on</i> the event thread.
     *
     * @param comp A text component such as a <code>JTextField</code>
     * @param validators One or more Validators
     */
    public final void add(JTextComponent comp, Validator<String>... validators) {
        assert EventQueue.isDispatchThread() : "Must be called on event thread";
        super.add(SwingValidationListenerFactory.createJTextComponentValidationListener(comp, ValidationStrategy.DEFAULT, this.getComponentDecorationFactory().decorationFor(comp), validators));
    }


    /**
     * Add a combo box to be validated using the passed validators
     *
     * <p> When a problem occurs, the created {@link ValidationListener} will
     * use a {@link ValidationUI} created by this {@code ValidationGroup} to decorate
     * the component.
     *
     * <p> <b>Note:</b> All methods in this class must be called from
     * the AWT Event Dispatch thread, or assertion errors will be
     * thrown.  Manipulating components on other threads is not safe.
     *
     * @param box A combo box component
     * @param validators One or more Validators
     */
    public final void add(JComboBox box, Validator<String>... validators) {
        assert EventQueue.isDispatchThread() : "Must be called on event thread";
        super.add(SwingValidationListenerFactory.createJComboBoxValidationListener(box, ValidationStrategy.DEFAULT, this.getComponentDecorationFactory().decorationFor(box), validators));
    }

    

    /**
     * Add a JList to be validated using the passed validators
     *
     * <p> When a problem occurs, the created {@link ValidationListener} will
     * use a {@link ValidationUI} created by this {@code ValidationGroup} to decorate
     * the component.
     *
     * <p> <b>Note:</b> All methods in this class must be called from
     * the AWT Event Dispatch thread, or assertion errors will be
     * thrown.  Manipulating components on other threads is not safe.
     *
     * @param list A JList component
     * @param validators One or more Validators
     */
    public final void add(JList list, Validator<Integer[]>... validators) {
        assert EventQueue.isDispatchThread() : "Must be called on event thread";
        super.add(SwingValidationListenerFactory.createJListValidationListener(list, ValidationStrategy.DEFAULT, this.getComponentDecorationFactory().decorationFor(list), validators));
    }


 

    /**
     * Add a validator of button models - typically to see if any are selected.
     *
     * <p> <b>Note:</b> All methods in this class must be called from
     * the AWT Event Dispatch thread, or assertion errors will be
     * thrown.  Manipulating components on other threads is not safe.
     *
     * @param buttons The buttons
     * @param validators A number of Validators
     */
    public final void add(final AbstractButton[] buttons, Validator<Integer[]>... validators) {
        assert EventQueue.isDispatchThread() : "Must be called on event thread";
        this.add( SwingValidationListenerFactory.createButtonsValidationListener(buttons, ValidationUI.NoOp.get(), validators ));
    }


    /**
     * Create a label which will show the current problem if any, which
     * can be added to a panel that uses validation
     *
     * @return A JLabel
     */
    public final JComponent createProblemLabel() {
        assert EventQueue.isDispatchThread() : "Must be called on event thread";
        final FixedHeightLabel result = new FixedHeightLabel();
        addUI(result.createUI());
        return result;
    }

    /**
     * Create a Popup which can be shown over a component to display what the
     * problem is.  The resulting popup will be word-wrapped and effort will be
     * made to ensure it fits on-screen in the case of lengthy error messages.
     *
     * @param problem The problem to show
     * @param target The target component
     * @param relativeLocation The coordinates where the popup should appear,
     * <i>in the coordinate space of the target component, not the screen</i>.
     * @return A popup.  Generally, use the returned popup once and get a new
     * one if you want to show a message again.  The returned popup will take
     * care of hiding itself on component hierarchy changes.
     */
    public static Popup createProblemPopup (Problem problem, Component target, Point relativeLocation) {
        return MultilineLabelUI.showPopup(problem, target, relativeLocation.x, relativeLocation.y);
    }
}