/*
* TriStateCheckBox.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 org.rstudio.core.client.resources.ImageResource2x;
import org.rstudio.core.client.theme.res.ThemeResources;
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;
// A three state checkbox that toggles between
// off -> indeterminate -> on
public class TriStateCheckBox extends Composite
implements HasValueChangeHandlers<TriStateCheckBox.State>
{
public static class State
{
private State () {}
}
public TriStateCheckBox(String label)
{
panel_ = new HorizontalPanel();
panel_.setVerticalAlignment(HorizontalPanel.ALIGN_MIDDLE);
panel_.addDomHandler(new ClickHandler()
{
@Override
public void onClick(ClickEvent event)
{
toggleState();
}
}, ClickEvent.getType());
alignHelper_ = new InlineHTML();
alignHelper_.addStyleName(RES.styles().alignHelper());
checkboxInner_ = new Image();
checkboxOuter_ = new FlowPanel();
checkboxOuter_.add(alignHelper_);
checkboxOuter_.add(checkboxInner_);
panel_.add(checkboxOuter_);
label_ = new Label(label);
label_.addStyleName(RES.styles().checkboxLabel());
panel_.add(label_);
setState(STATE_INDETERMINATE);
initWidget(panel_);
}
public void setState(State state)
{
if (state == STATE_INDETERMINATE)
checkboxInner_.setResource(new ImageResource2x(
ThemeResources.INSTANCE.checkboxTri2x()));
else if (state == STATE_OFF)
checkboxInner_.setResource(ThemeResources.INSTANCE.checkboxOff());
else if (state == STATE_ON)
checkboxInner_.setResource(ThemeResources.INSTANCE.checkboxOn());
checkboxOuter_.getElement().getStyle().setHeight(
checkboxInner_.getHeight(), Unit.PX);
state_ = state;
}
public void setValue(boolean value)
{
if (value)
{
checkboxInner_.setResource(ThemeResources.INSTANCE.checkboxOn());
state_ = STATE_ON;
}
else
{
checkboxInner_.setResource(ThemeResources.INSTANCE.checkboxOff());
state_ = STATE_OFF;
}
}
private void toggleState()
{
if (state_ == STATE_OFF)
setState(STATE_ON);
else if (state_ == STATE_INDETERMINATE)
setState(STATE_OFF);
else if (state_ == STATE_ON)
setState(STATE_INDETERMINATE);
ValueChangeEvent.fire(this, state_);
}
public State getState()
{
return state_;
}
public boolean isChecked()
{
return state_ == STATE_ON;
}
public boolean isUnchecked()
{
return state_ == STATE_OFF;
}
public boolean isIndeterminate()
{
return state_ == STATE_INDETERMINATE;
}
private final HorizontalPanel panel_;
private final Label label_;
private final InlineHTML alignHelper_;
private final Image checkboxInner_;
private final FlowPanel checkboxOuter_;
private State state_;
public static final State STATE_INDETERMINATE = new State();
public static final State STATE_OFF = new State();
public static final State STATE_ON = new State();
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<State> handler)
{
return handlerManager_.addHandler(
ValueChangeEvent.getType(),
handler);
}
@Override
public void fireEvent(GwtEvent<?> event)
{
handlerManager_.fireEvent(event);
}
}