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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.ColumnLayout
+ * @extends Ext.layout.ContainerLayout
+ * <p>This is the layout style of choice for creating structural layouts in a multi-column format where the width of
+ * each column can be specified as a percentage or fixed width, but the height is allowed to vary based on the content.
+ * This class is intended to be extended or created via the layout:'column' {@link Ext.Container#layout} config,
+ * and should generally not need to be created directly via the new keyword.</p>
+ * <p>ColumnLayout does not have any direct config options (other than inherited ones), but it does support a
+ * specific config property of <b><tt>columnWidth</tt></b> that can be included in the config of any panel added to it.  The
+ * layout will use the columnWidth (if present) or width of each panel during layout to determine how to size each panel.
+ * If width or columnWidth is not specified for a given panel, its width will default to the panel's width (or auto).</p>
+ * <p>The width property is always evaluated as pixels, and must be a number greater than or equal to 1.
+ * The columnWidth property is always evaluated as a percentage, and must be a decimal value greater than 0 and
+ * less than 1 (e.g., .25).</p>
+ * <p>The basic rules for specifying column widths are pretty simple.  The logic makes two passes through the
+ * set of contained panels.  During the first layout pass, all panels that either have a fixed width or none
+ * specified (auto) are skipped, but their widths are subtracted from the overall container width.  During the second
+ * pass, all panels with columnWidths are assigned pixel widths in proportion to their percentages based on
+ * the total <b>remaining</b> container width.  In other words, percentage width panels are designed to fill the space
+ * left over by all the fixed-width and/or auto-width panels.  Because of this, while you can specify any number of columns
+ * with different percentages, the columnWidths must always add up to 1 (or 100%) when added together, otherwise your
+ * layout may not render as expected.  Example usage:</p>
+ * <pre><code>
+// All columns are percentages -- they must add up to 1
+var p = new Ext.Panel({
+    title: 'Column Layout - Percentage Only',
+    layout:'column',
+    items: [{
+        title: 'Column 1',
+        columnWidth: .25 
+    },{
+        title: 'Column 2',
+        columnWidth: .6
+    },{
+        title: 'Column 3',
+        columnWidth: .15
+    }]
+});
+
+// Mix of width and columnWidth -- all columnWidth values must add up
+// to 1. The first column will take up exactly 120px, and the last two
+// columns will fill the remaining container width.
+var p = new Ext.Panel({
+    title: 'Column Layout - Mixed',
+    layout:'column',
+    items: [{
+        title: 'Column 1',
+        width: 120
+    },{
+        title: 'Column 2',
+        columnWidth: .8
+    },{
+        title: 'Column 3',
+        columnWidth: .2
+    }]
+});
+</code></pre>
+ */
+Ext.layout.ColumnLayout = Ext.extend(Ext.layout.ContainerLayout, {
+    // private
+    monitorResize:true,
+    
+    extraCls: 'x-column',
+
+    scrollOffset : 0,
+
+    // private
+    isValidParent : function(c, target){
+        return (c.getPositionEl ? c.getPositionEl() : c.getEl()).dom.parentNode == this.innerCt.dom;
+    },
+
+    // private
+    onLayout : function(ct, target){
+        var cs = ct.items.items, len = cs.length, c, i;
+
+        if(!this.innerCt){
+            target.addClass('x-column-layout-ct');
+
+            // the innerCt prevents wrapping and shuffling while
+            // the container is resizing
+            this.innerCt = target.createChild({cls:'x-column-inner'});
+            this.innerCt.createChild({cls:'x-clear'});
+        }
+        this.renderAll(ct, this.innerCt);
+
+        var size = Ext.isIE && target.dom != Ext.getBody().dom ? target.getStyleSize() : target.getViewSize();
+
+        if(size.width < 1 && size.height < 1){ // display none?
+            return;
+        }
+
+        var w = size.width - target.getPadding('lr') - this.scrollOffset,
+            h = size.height - target.getPadding('tb'),
+            pw = w;
+
+        this.innerCt.setWidth(w);
+        
+        // some columns can be percentages while others are fixed
+        // so we need to make 2 passes
+
+        for(i = 0; i < len; i++){
+            c = cs[i];
+            if(!c.columnWidth){
+                pw -= (c.getSize().width + c.getEl().getMargins('lr'));
+            }
+        }
+
+        pw = pw < 0 ? 0 : pw;
+
+        for(i = 0; i < len; i++){
+            c = cs[i];
+            if(c.columnWidth){
+                c.setSize(Math.floor(c.columnWidth*pw) - c.getEl().getMargins('lr'));
+            }
+        }
+    }
+    
+    /**
+     * @property activeItem
+     * @hide
+     */
+});
+
+Ext.Container.LAYOUTS['column'] = Ext.layout.ColumnLayout;
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