com.agnie.gwt.common.client.rpc.MultiSelectEventTranslator.java Source code

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Here is the source code for com.agnie.gwt.common.client.rpc.MultiSelectEventTranslator.java

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/*******************************************************************************
 * Copyright (c) 2014 Agnie Technologies.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Agnie Technologies - initial API and implementation
 ******************************************************************************/
package com.agnie.gwt.common.client.rpc;

import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.InputElement;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.view.client.CellPreviewEvent;
import com.google.gwt.view.client.DefaultSelectionEventManager.EventTranslator;
import com.google.gwt.view.client.DefaultSelectionEventManager.SelectAction;

public class MultiSelectEventTranslator<T> implements EventTranslator<T> {

    private RowSelectCommand<T> cmd;

    public MultiSelectEventTranslator() {
    }

    public MultiSelectEventTranslator(RowSelectCommand<T> cmd) {
        this.cmd = cmd;
    }

    @Override
    public boolean clearCurrentSelection(CellPreviewEvent<T> event) {
        return false;
    }

    @Override
    public SelectAction translateSelectionEvent(CellPreviewEvent<T> event) {
        NativeEvent nativeEvent = event.getNativeEvent();
        if ("click".equals(nativeEvent.getType())) {

            // Determine if we clicked on a checkbox.
            Element target = nativeEvent.getEventTarget().cast();
            if ("input".equals(target.getTagName().toLowerCase())) {
                final InputElement input = target.cast();
                if ("checkbox".equals(input.getType().toLowerCase())) {
                    // Synchronize the checkbox with the current selection state.
                    input.setChecked(event.getDisplay().getSelectionModel().isSelected(event.getValue()));
                    return SelectAction.TOGGLE;
                }
            } else if (cmd != null) {
                cmd.setSelected(event.getValue());
                Scheduler.get().scheduleDeferred(cmd);
            }
        }
        return SelectAction.IGNORE;
    }

    public static interface RowSelectCommand<T> extends ScheduledCommand {
        void setSelected(T selected);
    }
}