CallbackFactory.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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.
 */

package org.drools.workbench.screens.guided.dtable.client.widget.table.columns;

import java.util.Date;
import java.util.Map;

import com.google.gwt.user.client.ui.ListBox;
import org.drools.workbench.screens.guided.dtable.client.widget.table.columns.dom.listbox.MultiValueDOMElement;
import org.drools.workbench.screens.guided.dtable.client.widget.table.columns.dom.listbox.MultiValueSingletonDOMElementFactory;
import org.drools.workbench.screens.guided.dtable.client.widget.table.columns.dom.textbox.SingleValueDOMElement;
import org.drools.workbench.screens.guided.dtable.client.widget.table.columns.dom.textbox.SingleValueSingletonDOMElementFactory;
import org.gwtbootstrap3.client.ui.TextBox;
import org.uberfire.client.callbacks.Callback;
import org.uberfire.ext.widgets.common.client.common.DatePicker;
import org.uberfire.ext.wires.core.grids.client.model.GridCell;

/**
 * Factory for common callbacks used by the different columns.
 */
public class CallbackFactory {

    /**
     * Callback to set the value of a TextBox based on the Cells value.
     * @param factory Factory that can convert Cells' values to String.
     * @param cell The Cell to be rendered.
     * @return
     */
    public static <T, W extends TextBox, E extends SingleValueDOMElement<T, W>, F extends SingleValueSingletonDOMElementFactory<T, W, E>> Callback<E> makeOnCreationCallback( final F factory,
                                                                                                                                                                              final GridCell<T> cell ) {
        return ( e ) -> {
            if ( hasValue( cell ) ) {
                e.getWidget().setValue( factory.convert( cell.getValue().getValue() ) );
            } else {
                e.getWidget().setValue( "" );
            }
        };
    }

    /**
     * Callback to set the Focus on the TextBox.
     * @return
     */
    public static <T, W extends TextBox, E extends SingleValueDOMElement<T, W>> Callback<E> makeOnDisplayTextBoxCallback() {
        return ( e ) -> e.getWidget().setFocus( true );
    }

    /**
     * Callback to select an item in a ListBox based on the Cells value.
     * @param factory Factory that can convert Cells' values to String.
     * @param cell The Cell to be rendered.
     * @return
     */
    public static <T, W extends ListBox, E extends MultiValueDOMElement<T, W>, F extends MultiValueSingletonDOMElementFactory<T, W, E>> Callback<E> makeOnCreationCallback( final F factory,
                                                                                                                                                                            final GridCell<T> cell,
                                                                                                                                                                            final Map<String, String> enumLookups ) {
        return ( e ) -> {
            final W widget = e.getWidget();
            for ( Map.Entry<String, String> lookup : enumLookups.entrySet() ) {
                widget.addItem( lookup.getValue(),
                                lookup.getKey() );
            }
            factory.toWidget( cell,
                              widget );
        };
    }

    /**
     * Callback to set the Focus on the ListBox.
     * @return
     */
    public static <T, W extends ListBox, E extends MultiValueDOMElement<T, W>> Callback<E> makeOnDisplayListBoxCallback() {
        return ( e ) -> e.getWidget().setFocus( true );
    }

    /**
     * Callback to set the value of a DatePicker based on the Cells value.
     * @param cell The Cell to be rendered.
     * @return
     */
    public static <E extends SingleValueDOMElement<Date, DatePicker>> Callback<E> makeOnCreationCallback( final GridCell<Date> cell ) {
        return ( e ) -> {
            final DatePicker widget = e.getWidget();
            if ( hasValue( cell ) ) {
                widget.setValue( cell.getValue().getValue() );
            } else {
                widget.setValue( new Date() );
            }
        };
    }

    /**
     * Callback to set the Focus on the DatePicker.
     * @return
     */
    public static <E extends SingleValueDOMElement<Date, DatePicker>> Callback<E> makeOnDisplayDatePickerCallback() {
        return ( e ) -> e.getWidget().setFocus( true );
    }

    private static <T> boolean hasValue( final GridCell<T> cell ) {
        if ( cell == null || cell.getValue() == null || cell.getValue().getValue() == null ) {
            return false;
        }
        return true;
    }

}