org.rstudio.core.client.widget.ThemedCheckBox.java Source code

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Here is the source code for org.rstudio.core.client.widget.ThemedCheckBox.java

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/*
 * ThemedCheckBox.java
 *
 * Copyright (C) 2009-12 by RStudio, Inc.
 *
 * Unless you have received this program directly from RStudio pursuant
 * to the terms of a commercial license agreement with RStudio, then
 * this program is licensed to you under the terms of version 3 of the
 * GNU Affero General Public License. This program is distributed WITHOUT
 * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
 * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
 *
 */
package org.rstudio.core.client.widget;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.CssResource;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.InlineHTML;
import com.google.gwt.user.client.ui.Label;

import org.rstudio.core.client.theme.res.ThemeResources;

public class ThemedCheckBox extends Composite implements HasValueChangeHandlers<Boolean> {
    public ThemedCheckBox(String label, boolean initialValue) {
        panel_ = new HorizontalPanel();
        panel_.setVerticalAlignment(HorizontalPanel.ALIGN_MIDDLE);
        panel_.addDomHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                toggleValue();
            }
        }, ClickEvent.getType());

        alignHelper_ = new InlineHTML();
        alignHelper_.addStyleName(RES.styles().alignHelper());

        checkboxInner_ = new Image();
        checkboxOuter_ = new FlowPanel();
        checkboxOuter_.getElement().getStyle().setHeight(12, Unit.PX);
        checkboxOuter_.add(alignHelper_);
        checkboxOuter_.add(checkboxInner_);
        panel_.add(checkboxOuter_);

        label_ = new Label(label);
        label_.addStyleName(RES.styles().checkboxLabel());
        panel_.add(label_);

        setValue(initialValue, true);

        initWidget(panel_);
    }

    public ThemedCheckBox(String label) {
        this(label, false);
    }

    public boolean toggleValue() {
        setValue(!getValue());
        return getValue();
    }

    public boolean getValue() {
        return value_;
    }

    private void setValue(boolean value, boolean force) {
        if (force || value_ != value) {
            value_ = value;
            updateCheckboxImage();
            ValueChangeEvent.fire(this, value);
        }
    }

    public void setValue(boolean value) {
        setValue(value, false);
    }

    private void updateCheckboxImage() {
        if (getValue())
            checkboxInner_.setResource(ThemeResources.INSTANCE.checkboxOn());
        else
            checkboxInner_.setResource(ThemeResources.INSTANCE.checkboxOff());
    }

    private final HorizontalPanel panel_;
    private final Label label_;

    private final InlineHTML alignHelper_;
    private final Image checkboxInner_;
    private final FlowPanel checkboxOuter_;

    private boolean value_;

    public interface Styles extends CssResource {
        String alignHelper();

        String checkboxLabel();
    }

    public interface Resources extends ClientBundle {
        @Source("TriStateCheckBox.css")
        Styles styles();
    }

    private static Resources RES = GWT.create(Resources.class);
    static {
        RES.styles().ensureInjected();
    }

    private final HandlerManager handlerManager_ = new HandlerManager(this);

    @Override
    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<Boolean> handler) {
        return handlerManager_.addHandler(ValueChangeEvent.getType(), handler);
    }

    @Override
    public void fireEvent(GwtEvent<?> event) {
        handlerManager_.fireEvent(event);
    }

}