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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * For further information about Alkacon Software, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.gwt.client.ui.input;

import org.opencms.gwt.client.ui.CmsPushButton;
import org.opencms.gwt.client.ui.I_CmsButton.ButtonStyle;
import org.opencms.gwt.client.ui.css.I_CmsInputCss;
import org.opencms.gwt.client.ui.css.I_CmsInputLayoutBundle;

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.HandlerRegistration;
import com.google.gwt.user.client.ui.Composite;

/**
 * Tri-state checkbox.

*/ public class CmsTriStateCheckBox extends Composite implements HasValueChangeHandlers { /** * The possible check box states.

*/ public enum State { /** neither on nor off. */ middle, /** off. **/ off, /** on. **/ on; } /** The CSS bundle for this class. */ protected static final I_CmsInputCss CSS = I_CmsInputLayoutBundle.INSTANCE.inputCss(); /** The button which provides the actual widget layout. */ private CmsPushButton m_button; /** The state to use as a next state if the user clicks on the checkbox while it is in its third state. */ private State m_nextStateAfterMiddle = State.off; /** The current state. */ private State m_state; /** The check box text. */ private String m_text; /** * Creates a new instance.

* * @param labelText the label text */ public CmsTriStateCheckBox(String labelText) { m_button = new CmsPushButton(); m_text = labelText; initWidget(m_button); m_button.setButtonStyle(ButtonStyle.TRANSPARENT, null); addStyleName(CSS.triState()); m_state = State.middle; updateStyle(); m_button.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { CmsTriStateCheckBox.this.onClick(); } }); } /** * @see com.google.gwt.event.logical.shared.HasValueChangeHandlers#addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler) */ public HandlerRegistration addValueChangeHandler(ValueChangeHandler handler) { return addHandler(handler, ValueChangeEvent.getType()); } /** * Sets the state which the check box should transition to if the user clicks on it while it is neither on nor off.

* * @param state the target state */ public void setNextStateAfterIntermediateState(State state) { m_nextStateAfterMiddle = state; } /** * Sets the state of the check box and optionally fires an event.

* * @param state the new state * @param fireEvent true if a ValueChangeEvent should be fired */ public void setState(State state, boolean fireEvent) { boolean changed = m_state != state; m_state = state; if (changed) { updateStyle(); } if (fireEvent) { ValueChangeEvent.fire(this, state); } } /** * Sets the check box label text.

* * @param text the new label text */ public void setText(String text) { m_text = text; updateStyle(); } /** * Handles clicks on the check box.

*/ protected void onClick() { State newState = getNextState(m_state); setState(newState, true); } /** * Gets the image class to use for the check box.

* * @return the image class */ private String getImageClass() { switch (m_state) { case on: return CSS.triStateOn(); case off: return CSS.triStateOff(); case middle: default: return CSS.triStateMedium(); } } /** * Gets the state which the check box would change to if cilcked on in a given state.

* * @param state the original state * @return the next state */ private State getNextState(State state) { State nextState = null; switch (state) { case off: nextState = State.on; break; case on: nextState = State.off; break; case middle: default: nextState = m_nextStateAfterMiddle; } return nextState; } /** * Updates the UI state according to the logical state.

*/ private void updateStyle() { m_button.setUpFace(m_text, getImageClass()); } }





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