org.zkoss.gwt.client.zk.Container.java Source code

Introduction

Here is the source code for org.zkoss.gwt.client.zk.Container.java

Source

/* Container.java
    
   Purpose:
      
   Description:
      
   History:
  Mon March 29 11:28   2010, Created by Ian Tsai(Zanyking)
    
Copyright (C) 2010 Potix Corporation. All Rights Reserved.
    
{{IS_RIGHT
   This program is distributed under Apache license version 2.0 in the hope that
   it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.gwt.client.zk;

import java.util.Iterator;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.user.client.ui.HasWidgets;

/**
 *  @author Ian Tsai(Zanyking)
 *
 */
public abstract class Container extends Widget implements HasWidgets {

    /***** SECTION: widget tree node operation. *****/

    //   private ArrayList<Widget> children = new ArrayList<Widget>();

    public void add(Widget zChild) {
        this.add((com.google.gwt.user.client.ui.Widget) zChild);
    }

    @Override
    public void add(com.google.gwt.user.client.ui.Widget child) {
        /** Validate */
        if (!(child instanceof Widget)) {
            throw new RuntimeException("must be ZK Widget!");
        }
        Widget zChild = (Widget) child;

        /** adjust for Re Insertion */

        /** Detach Child */
        if (zChild.isAttached()) {
            zChild.removeFromParent();
        }
        /** Logical Attach */

        /** Physical Attach */
        appendChild((zChild).getZkWidget());
        /** Adopt */
        zChild.setParent(this);
    }

    private native boolean appendChild(JavaScriptObject childZWidget)/*-{
                                                                     var widget = this.@org.zkoss.gwt.client.zk.Widget::getZkWidget()();
                                                                     return widget.appendChild(childZWidget);
                                                                     }-*/;

    @Override
    public boolean remove(com.google.gwt.user.client.ui.Widget child) {
        if (!(child instanceof Widget)) {
            return false;
        }
        Widget zChild = (Widget) child;

        return this.removeChild(zChild.getZkWidget());
    }

    /**
     * 
     * @param childZWidget
     * @return
     */
    private native boolean removeChild(JavaScriptObject childZWidget)/*-{
                                                                     var widget = this.@org.zkoss.gwt.client.zk.Widget::getZkWidget()();
                                                                     return widget.removeChild(childZWidget);
                                                                     }-*/;

    @Override
    public Iterator<com.google.gwt.user.client.ui.Widget> iterator() {

        return new Iterator<com.google.gwt.user.client.ui.Widget>() {
            private Widget currentChild = firstChild();

            @Override
            public boolean hasNext() {
                if (currentChild == null)
                    return false;
                Widget next = currentChild.nextSibling();
                return next != null;
            }

            @Override
            public com.google.gwt.user.client.ui.Widget next() {
                return currentChild = currentChild.nextSibling();
            }

            @Override
            public void remove() {

            }
        };
    }

    public native void clear()/*-{
                              var widget = this.@org.zkoss.gwt.client.zk.Widget::getZkWidget()();
                              widget.clear();
                              }-*/;

    //******* wrapping method *******/
    /**
      * 
      * @param index
      * @return
      */
    public native Widget getChildAt(int index)/*-{
                                              var wgt = this.@org.zkoss.gwt.client.zk.Widget::getZkWidget()();
                                              wgt = wgt.getChildAt(index);
                                              return (wgt)? wgt.__gwtIns : null;
                                              }-*/;

    /**
     * 
     * @return
     */
    protected native Widget firstChild()/*-{
                                        var wgt = this.@org.zkoss.gwt.client.zk.Widget::getZkWidget()();
                                        wgt = wgt.firstChild;
                                        return (wgt)? wgt.__gwtIns : null;
                                        }-*/;

    /**
     * 
     * @return
     */
    protected native Widget lastChild()/*-{
                                       var wgt = this.@org.zkoss.gwt.client.zk.Widget::getZkWidget()();
                                       wgt = wgt.lastChild;
                                       return (wgt)? wgt.__gwtIns : null;
                                       }-*/;

}