/*--------------------------------------------------------------------------
    *  Copyright 2008 utgenome.org
    *
    *  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.
   *--------------------------------------------------------------------------*/
  //--------------------------------------
  // utgb-widget Project
  //
  // Tab.java
  // Since: May 2, 2008
  //
  // $URL$ 
  // $Author$
  //--------------------------------------
  package org.utgenome.gwt.widget.client;
  
  import com.google.gwt.event.dom.client.ClickEvent;
  import com.google.gwt.event.dom.client.ClickHandler;
  import com.google.gwt.event.dom.client.MouseDownHandler;
  import com.google.gwt.event.dom.client.MouseOutEvent;
  import com.google.gwt.event.dom.client.MouseOutHandler;
  import com.google.gwt.event.dom.client.MouseOverEvent;
  import com.google.gwt.event.dom.client.MouseOverHandler;
  import com.google.gwt.user.client.ui.Composite;
  import com.google.gwt.user.client.ui.FlexTable;
  import com.google.gwt.user.client.ui.FocusPanel;
  import com.google.gwt.user.client.ui.HorizontalPanel;
  import com.google.gwt.user.client.ui.Label;
  import com.google.gwt.user.client.ui.TabPanel;
  import com.google.gwt.user.client.ui.VerticalPanel;
  import com.google.gwt.user.client.ui.Widget;
  
  /**
   * Tab widget for the tab panel
   * 
   * @author leo
   * 
   */
  public class Tab extends Composite implements MouseOutHandler, MouseOverHandler {
  
  	private FocusPanel focusPanel = new FocusPanel();
  	private FlexTable layoutFrame = new FlexTable();
  	private Label left = new Label();
  	private HorizontalPanel center = new HorizontalPanel();
  	private Label right = new Label();
  	private Label centerLabel = new Label();
  
  	UTGBDesignFactory designFactory = new UTGBDesignFactory();
  	private boolean enableClose = true;
  	private Icon closeButton;
  
  	private TabPanel parentTabPanel = null;
  	private Widget tabWidget = null;
  
  	public Tab(String label) {
  		drawWidget(label);
  
  		centerLabel.addMouseOutHandler(this);
  		centerLabel.addMouseOverHandler(this);
  
  		initWidget(focusPanel);
  	}
  
  	public void addMouseDownHandler(MouseDownHandler handler) {
  		centerLabel.addMouseDownHandler(handler);
  	}
  
  	private void drawWidget(String label) {
  
  		layoutFrame.setCellPadding(0);
  		layoutFrame.setCellSpacing(0);
  
  		Style.backgroundNoRepeat(left);
  		Style.fontSize(left, 0);
  
  		left.setPixelSize(9, 21);
  
  		centerLabel.setText(label);
  		center.setVerticalAlignment(VerticalPanel.ALIGN_MIDDLE);
  		center.add(centerLabel);
  
  		Style.fullWidth(center);
  		Style.textAlign(center, "center");
  
  		Style.backgroundRepeatX(center);
  		Style.fontSize(centerLabel, 13);
  		Style.fontFamily(centerLabel, "Arial, Helvetica, Tahoma");
  		Style.bold(centerLabel);
  		Style.fontColor(centerLabel, "#666666");
 		Style.nowrap(centerLabel);
 		Style.fullWidth(centerLabel);
 		center.setHeight("21px");
 
 		Style.backgroundNoRepeat(right);
 		Style.backgroundPosition(right, "top right");
 		Style.fontSize(right, 0);
 
 		center.setHorizontalAlignment(HorizontalPanel.ALIGN_RIGHT);
 		closeButton = designFactory.getTabCloseButton();
 		Style.padding(closeButton, Style.LEFT, 3);
 		Style.padding(closeButton, Style.TOP, 2);
 		center.add(closeButton);
 
 		closeButton.addClickHandler(new ClickHandler() {
 
 			public void onClick(ClickEvent arg0) {
 				if (!enableClose)
 					return;
 				if (parentTabPanel != null) {
 					if (tabWidget != null)
 						parentTabPanel.remove(tabWidget);
 				}
 			}
 
 		});
 
 		right.setPixelSize(9, 21);
 
 		layoutFrame.setHeight("21px");
 		layoutFrame.setWidth("100px");
 		layoutFrame.setWidget(0, 0, left);
 		layoutFrame.setWidget(0, 1, center);
 		layoutFrame.setWidget(0, 2, right);
 		layoutFrame.getRowFormatter().setVerticalAlign(0, VerticalPanel.ALIGN_MIDDLE);
 		layoutFrame.getCellFormatter().setWidth(0, 1, "100%");
 
 		setBackground(false);
 
 		focusPanel.setWidget(layoutFrame);
 	}
 
 	public void enableCloseButton(boolean enableClose) {
 		this.enableClose = enableClose;
 		//		
 		// if (enableClose)
 		// closeButton.setIcon(designFactory.getTabCloseButton());
 		// else
 		// closeButton.setIconImage(designFactory.getUTGBImageBundle().disabledIcon().createImage());
 
 		closeButton.setVisible(enableClose);
 
 	}
 
 	public void setParenTabPanel(TabPanel tabPanel, Widget tabWidet) {
 		this.parentTabPanel = tabPanel;
 		this.tabWidget = tabWidet;
 	}
 
 	private void setBackground(boolean onMouse) {
 		if (onMouse) {
 			Style.backgroundImage(left, "theme/default/wframe_lw.gif");
 			Style.backgroundImage(center, "theme/default/wframe_cw.gif");
 			Style.backgroundImage(right, "theme/default/wframe_rw.gif");
 		}
 		else {
 			Style.backgroundImage(left, "theme/default/wframe_l.gif");
 			Style.backgroundImage(center, "theme/default/wframe_c.gif");
 			Style.backgroundImage(right, "theme/default/wframe_r.gif");
 		}
 	}
 
 	private boolean isSelected = false;
 
 	public void setSelect(boolean selected) {
 		isSelected = selected;
 		setBackground(selected);
 	}
 
 	public void onMouseOver(MouseOverEvent arg0) {
 		setBackground(true);
 	}
 
 	public void onMouseOut(MouseOutEvent arg0) {
 		setBackground(isSelected | false);
 	}
 
 }