org.anstis.client.grid.widget.dom.CheckBoxDOMElement.java Source code

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Here is the source code for org.anstis.client.grid.widget.dom.CheckBoxDOMElement.java

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/*
 * Copyright 2015 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.
 */
package org.anstis.client.grid.widget.dom;

import com.google.gwt.dom.client.Style;
import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.ui.AbsolutePanel;
import org.anstis.client.grid.model.BaseGridCellValue;
import org.anstis.client.grid.model.IGridCell;
import org.anstis.client.grid.widget.BaseGridWidget;
import org.anstis.client.grid.widget.GridLayer;
import org.anstis.client.grid.widget.context.GridCellRenderContext;
import org.gwtbootstrap3.client.ui.CheckBox;

/**
 * A DOMElement for CheckBoxes.
 */
public class CheckBoxDOMElement extends BaseDOMElement<Boolean, CheckBox> {

    //Hack to centre CheckBox
    private static final int SIZE = 20;

    private final CheckBox cb = new CheckBox();
    private GridCellRenderContext context;

    public CheckBoxDOMElement(final GridLayer gridLayer, final BaseGridWidget<?, ?> gridWidget,
            final IDOMElementFactory<Boolean, ?> factory, final AbsolutePanel domElementContainer) {
        super(gridLayer, gridWidget, factory, domElementContainer);
        final Style style = cb.getElement().getStyle();
        style.setMarginTop(0, Style.Unit.PX);
        style.setMarginLeft(2, Style.Unit.PX);
        style.setWidth(SIZE, Style.Unit.PX);
        style.setHeight(SIZE, Style.Unit.PX);

        getContainer().setWidget(cb);

        cb.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(final ClickEvent event) {
                flush();
            }
        });
        cb.addBlurHandler(new BlurHandler() {
            @Override
            public void onBlur(final BlurEvent event) {
                if (context != null) {
                    factory.freeUnusedResources();
                }
            }
        });
    }

    @Override
    public void initialise(final IGridCell<Boolean> cell, final GridCellRenderContext context) {
        this.context = context;
        cb.setValue(cell == null ? false : cell.getValue().getValue());
        final Style style = cb.getElement().getStyle();
        style.setLeft((context.getWidth() - SIZE) / 2, Style.Unit.PX);
        style.setTop((context.getHeight() - SIZE) / 2, Style.Unit.PX);
        transform(context);
    }

    @Override
    public CheckBox getWidget() {
        return cb;
    }

    @Override
    public void flush(final Command command) {
        if (context != null) {
            final int rowIndex = context.getRowIndex();
            final int columnIndex = context.getColumnIndex();
            final BaseGridWidget<?, ?> widget = context.getWidget();
            context = null;

            widget.getModel().setCell(rowIndex, columnIndex, new BaseGridCellValue<>(cb.getValue()));
            ((GridLayer) widget.getLayer()).draw(command);

        } else {
            command.execute();
        }
    }

}