org.drools.brms.client.modeldriven.ui.CompositeFactPatternWidget.java Source code

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Here is the source code for org.drools.brms.client.modeldriven.ui.CompositeFactPatternWidget.java

Source

package org.drools.brms.client.modeldriven.ui;
/*
 * Copyright 2005 JBoss Inc
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.drools.brms.client.common.DirtyableComposite;
import org.drools.brms.client.common.DirtyableFlexTable;
import org.drools.brms.client.common.DirtyableVerticalPane;
import org.drools.brms.client.common.FormStylePopup;
import org.drools.brms.client.common.ImageButton;
import org.drools.brms.client.modeldriven.HumanReadable;
import org.drools.brms.client.modeldriven.SuggestionCompletionEngine;
import org.drools.brms.client.modeldriven.brl.CompositeFactPattern;
import org.drools.brms.client.modeldriven.brl.FactPattern;

import com.google.gwt.user.client.ui.ChangeListener;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * This represents a top level CE, like an OR, NOT, EXIST etc...
 * Contains a list of FactPatterns. 
 * 
 * @author Michael Neale
 *
 */
public class CompositeFactPatternWidget extends DirtyableComposite {

    private final SuggestionCompletionEngine completions;
    private CompositeFactPattern pattern;
    private DirtyableFlexTable layout;
    private RuleModeller modeller;

    public CompositeFactPatternWidget(RuleModeller modeller, CompositeFactPattern pattern,
            SuggestionCompletionEngine completions) {
        this.completions = completions;
        this.pattern = pattern;
        this.modeller = modeller;

        this.layout = new DirtyableFlexTable();
        this.layout.setStyleName("model-builderInner-Background");

        doLayout();
        initWidget(layout);
    }

    private void doLayout() {
        this.layout.setWidget(0, 0, getCompositeLabel());

        if (pattern.patterns != null) {
            DirtyableVerticalPane vert = new DirtyableVerticalPane();
            FactPattern[] facts = pattern.patterns;
            for (int i = 0; i < facts.length; i++) {
                vert.add(new FactPatternWidget(modeller, facts[i], this.completions, false));
            }
            this.layout.setWidget(0, 1, vert);
        }
    }

    private Widget getCompositeLabel() {

        HorizontalPanel horiz = new HorizontalPanel();
        Image edit = new ImageButton("images/add_field_to_fact.gif");
        edit.setTitle("Add a fact to this constraint. If it is an 'or' type, it will need at least 2.");
        edit.addClickListener(new ClickListener() {
            public void onClick(Widget w) {
                showFactTypeSelector(w);
            }
        });

        horiz.add(new Label(HumanReadable.getCEDisplayName(pattern.type)));
        horiz.add(edit);
        horiz.setStyleName("modeller-composite-Label");
        return horiz;
    }

    /**
     * Pops up the fact selector.
     */
    protected void showFactTypeSelector(final Widget w) {
        final ListBox box = new ListBox();
        String[] facts = completions.getFactTypes();

        box.addItem("Choose...");
        for (int i = 0; i < facts.length; i++) {
            box.addItem(facts[i]);
        }
        box.setSelectedIndex(0);

        final FormStylePopup popup = new FormStylePopup("images/new_fact.gif", "New fact pattern...");
        popup.addAttribute("choose fact type", box);

        box.addChangeListener(new ChangeListener() {
            public void onChange(Widget w) {
                pattern.addFactPattern(new FactPattern(box.getItemText(box.getSelectedIndex())));
                modeller.refreshWidget();
                popup.hide();
            }
        });
        popup.setStyleName("ks-popups-Popup");

        popup.setPopupPosition(w.getAbsoluteLeft() - 400, w.getAbsoluteTop());
        popup.show();
    }

    public boolean isDirty() {
        return layout.hasDirty();
    }

}