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+/*!
+ * Ext JS Library 3.0.0
+ * Copyright(c) 2006-2009 Ext JS, LLC
+ * licensing@extjs.com
+ * http://www.extjs.com/license
+ */
+/**
+ * @class Ext.layout.AnchorLayout
+ * @extends Ext.layout.ContainerLayout
+ * <p>This is a layout that enables anchoring of contained elements relative to the container's dimensions.
+ * If the container is resized, all anchored items are automatically rerendered according to their
+ * <b><tt>{@link #anchor}</tt></b> rules.</p>
+ * <p>This class is intended to be extended or created via the layout:'anchor' {@link Ext.Container#layout}
+ * config, and should generally not need to be created directly via the new keyword.</p>
+ * <p>AnchorLayout does not have any direct config options (other than inherited ones). By default,
+ * AnchorLayout will calculate anchor measurements based on the size of the container itself. However, the
+ * container using the AnchorLayout can supply an anchoring-specific config property of <b>anchorSize</b>.
+ * If anchorSize is specifed, the layout will use it as a virtual container for the purposes of calculating
+ * anchor measurements based on it instead, allowing the container to be sized independently of the anchoring
+ * logic if necessary.  For example:</p>
+ * <pre><code>
+var viewport = new Ext.Viewport({
+    layout:'anchor',
+    anchorSize: {width:800, height:600},
+    items:[{
+        title:'Item 1',
+        html:'Content 1',
+        width:800,
+        anchor:'right 20%'
+    },{
+        title:'Item 2',
+        html:'Content 2',
+        width:300,
+        anchor:'50% 30%'
+    },{
+        title:'Item 3',
+        html:'Content 3',
+        width:600,
+        anchor:'-100 50%'
+    }]
+});
+ * </code></pre>
+ */
+Ext.layout.AnchorLayout = Ext.extend(Ext.layout.ContainerLayout, {
+    /**
+     * @cfg {String} anchor
+     * <p>This configuation option is to be applied to <b>child <tt>items</tt></b> of a container managed by
+     * this layout (ie. configured with <tt>layout:'anchor'</tt>).</p><br/>
+     * 
+     * <p>This value is what tells the layout how an item should be anchored to the container. <tt>items</tt>
+     * added to an AnchorLayout accept an anchoring-specific config property of <b>anchor</b> which is a string
+     * containing two values: the horizontal anchor value and the vertical anchor value (for example, '100% 50%').
+     * The following types of anchor values are supported:<div class="mdetail-params"><ul>
+     * 
+     * <li><b>Percentage</b> : Any value between 1 and 100, expressed as a percentage.<div class="sub-desc">
+     * The first anchor is the percentage width that the item should take up within the container, and the
+     * second is the percentage height.  For example:<pre><code>
+// two values specified
+anchor: '100% 50%' // render item complete width of the container and
+                   // 1/2 height of the container
+// one value specified
+anchor: '100%'     // the width value; the height will default to auto
+     * </code></pre></div></li>
+     * 
+     * <li><b>Offsets</b> : Any positive or negative integer value.<div class="sub-desc">
+     * This is a raw adjustment where the first anchor is the offset from the right edge of the container,
+     * and the second is the offset from the bottom edge. For example:<pre><code>
+// two values specified
+anchor: '-50 -100' // render item the complete width of the container
+                   // minus 50 pixels and
+                   // the complete height minus 100 pixels.
+// one value specified
+anchor: '-50'      // anchor value is assumed to be the right offset value
+                   // bottom offset will default to 0
+     * </code></pre></div></li>
+     * 
+     * <li><b>Sides</b> : Valid values are <tt>'right'</tt> (or <tt>'r'</tt>) and <tt>'bottom'</tt>
+     * (or <tt>'b'</tt>).<div class="sub-desc">
+     * Either the container must have a fixed size or an anchorSize config value defined at render time in
+     * order for these to have any effect.</div></li>
+     *
+     * <li><b>Mixed</b> : <div class="sub-desc">
+     * Anchor values can also be mixed as needed.  For example, to render the width offset from the container
+     * right edge by 50 pixels and 75% of the container's height use:
+     * <pre><code>
+anchor: '-50 75%' 
+     * </code></pre></div></li>
+     * 
+     * 
+     * </ul></div>
+     */
+    
+    // private
+    monitorResize:true,
+
+    // private
+    getAnchorViewSize : function(ct, target){
+        return target.dom == document.body ?
+                   target.getViewSize() : target.getStyleSize();
+    },
+
+    // private
+    onLayout : function(ct, target){
+        Ext.layout.AnchorLayout.superclass.onLayout.call(this, ct, target);
+
+        var size = this.getAnchorViewSize(ct, target);
+
+        var w = size.width, h = size.height;
+
+        if(w < 20 && h < 20){
+            return;
+        }
+
+        // find the container anchoring size
+        var aw, ah;
+        if(ct.anchorSize){
+            if(typeof ct.anchorSize == 'number'){
+                aw = ct.anchorSize;
+            }else{
+                aw = ct.anchorSize.width;
+                ah = ct.anchorSize.height;
+            }
+        }else{
+            aw = ct.initialConfig.width;
+            ah = ct.initialConfig.height;
+        }
+
+        var cs = ct.items.items, len = cs.length, i, c, a, cw, ch;
+        for(i = 0; i < len; i++){
+            c = cs[i];
+            if(c.anchor){
+                a = c.anchorSpec;
+                if(!a){ // cache all anchor values
+                    var vs = c.anchor.split(' ');
+                    c.anchorSpec = a = {
+                        right: this.parseAnchor(vs[0], c.initialConfig.width, aw),
+                        bottom: this.parseAnchor(vs[1], c.initialConfig.height, ah)
+                    };
+                }
+                cw = a.right ? this.adjustWidthAnchor(a.right(w), c) : undefined;
+                ch = a.bottom ? this.adjustHeightAnchor(a.bottom(h), c) : undefined;
+
+                if(cw || ch){
+                    c.setSize(cw || undefined, ch || undefined);
+                }
+            }
+        }
+    },
+
+    // private
+    parseAnchor : function(a, start, cstart){
+        if(a && a != 'none'){
+            var last;
+            if(/^(r|right|b|bottom)$/i.test(a)){   // standard anchor
+                var diff = cstart - start;
+                return function(v){
+                    if(v !== last){
+                        last = v;
+                        return v - diff;
+                    }
+                }
+            }else if(a.indexOf('%') != -1){
+                var ratio = parseFloat(a.replace('%', ''))*.01;   // percentage
+                return function(v){
+                    if(v !== last){
+                        last = v;
+                        return Math.floor(v*ratio);
+                    }
+                }
+            }else{
+                a = parseInt(a, 10);
+                if(!isNaN(a)){                            // simple offset adjustment
+                    return function(v){
+                        if(v !== last){
+                            last = v;
+                            return v + a;
+                        }
+                    }
+                }
+            }
+        }
+        return false;
+    },
+
+    // private
+    adjustWidthAnchor : function(value, comp){
+        return value;
+    },
+
+    // private
+    adjustHeightAnchor : function(value, comp){
+        return value;
+    }
+    
+    /**
+     * @property activeItem
+     * @hide
+     */
+});
+Ext.Container.LAYOUTS['anchor'] = Ext.layout.AnchorLayout;
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