/*!
 * 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;