org.openremote.modeler.client.utils.CheckboxCellHeader.java Source code

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Here is the source code for org.openremote.modeler.client.utils.CheckboxCellHeader.java

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/* OpenRemote, the Home of the Digital Home.
* Copyright 2008-2012, OpenRemote Inc.
*
* See the contributors.txt file in the distribution for a
* full listing of individual contributors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.openremote.modeler.client.utils;

import com.google.gwt.cell.client.Cell;
import com.google.gwt.cell.client.Cell.Context;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.user.cellview.client.Header;
import com.google.gwt.user.client.Event;

/**
 * Header to be used with CellTable allowing select all/deselect all checkbox behavior.
 * 
 * Based on code found here: http://snipt.net/araujo921/checkbox-in-gwt-celltable-header/
 * 
 * @author ebr
 */
public class CheckboxCellHeader extends Header<Boolean> {

    public CheckboxCellHeader(Cell<Boolean> cell) {
        super(cell);
    }

    private boolean value;

    private ChangeValue changeValue;

    @Override
    public Boolean getValue() {
        return value;
    }

    public void setValue(Boolean value) {
        this.value = value;
    }

    public void setChangeValue(ChangeValue changeValue) {
        this.changeValue = changeValue;
    }

    @Override
    public void onBrowserEvent(Context context, Element elem, NativeEvent event) {
        Event evt = Event.as(event);
        int eventType = evt.getTypeInt();
        switch (eventType) {
        case Event.ONCHANGE:
            value = !value;
            if (changeValue != null)
                changeValue.changedValue(context.getColumn(), value);
            break;
        }
        super.onBrowserEvent(context, elem, event);
    }

    @Override
    public void render(Context context, SafeHtmlBuilder sb) {
        super.render(context, sb.appendEscaped(""));
    }

    // Checkbox changed Handler

    public interface ChangeValue {
        void changedValue(int columnIndex, Boolean value);
    }
}