// We are adding these custom layouts to a namespace that does not
// exist by default in Ext, so we have to add the namespace first:
Ext.ns('Ext.ux.layout');

/**
 * @class Ext.ux.layout.RowLayout
 * @extends Ext.layout.ContainerLayout
 * 
This is the layout style of choice for creating structural layouts in a multi-row format where the height of
 * each row can be specified as a percentage or fixed height.  Row widths can also be fixed, percentage or auto.
 * This class is intended to be extended or created via the layout:'ux.row' {@link Ext.Container#layout} config,
 * and should generally not need to be created directly via the new keyword.
 * 
RowLayout does not have any direct config options (other than inherited ones), but it does support a
 * specific config property of rowHeight that can be included in the config of any panel added to it.  The
 * layout will use the rowHeight (if present) or height of each panel during layout to determine how to size each panel.
 * If height or rowHeight is not specified for a given panel, its height will default to the panel's height (or auto).
 * 
The height property is always evaluated as pixels, and must be a number greater than or equal to 1.
 * The rowHeight property is always evaluated as a percentage, and must be a decimal value greater than 0 and
 * less than 1 (e.g., .25).
 * 
The basic rules for specifying row heights 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 height or none
 * specified (auto) are skipped, but their heights are subtracted from the overall container height.  During the second
 * pass, all panels with rowHeights are assigned pixel heights in proportion to their percentages based on
 * the total remaining container height.  In other words, percentage height panels are designed to fill the space
 * left over by all the fixed-height and/or auto-height panels.  Because of this, while you can specify any number of rows
 * with different percentages, the rowHeights must always add up to 1 (or 100%) when added together, otherwise your
 * layout may not render as expected.  Example usage:
 * 

// All rows are percentages -- they must add up to 1
var p = new Ext.Panel({
    title: 'Row Layout - Percentage Only',
    layout:'ux.row',
    items: [{
        title: 'Row 1',
        rowHeight: .25
    },{
        title: 'Row 2',
        rowHeight: .6
    },{
        title: 'Row 3',
        rowHeight: .15
    }]
});

// Mix of height and rowHeight -- all rowHeight values must add
// up to 1. The first row will take up exactly 120px, and the last two
// rows will fill the remaining container height.
var p = new Ext.Panel({
    title: 'Row Layout - Mixed',
    layout:'ux.row',
    items: [{
        title: 'Row 1',
        height: 120,
        // standard panel widths are still supported too:
        width: '50%' // or 200
    },{
        title: 'Row 2',
        rowHeight: .8,
        width: 300
    },{
        title: 'Row 3',
        rowHeight: .2
    }]
});

 */
Ext.ux.layout.RowLayout = Ext.extend(Ext.layout.ContainerLayout, {
    // private
    monitorResize:true,

    // private
    isValidParent : function(c, target){
        return c.getEl().dom.parentNode == this.innerCt.dom;
    },

    // private
    onLayout : function(ct, target){
        var rs = ct.items.items, len = rs.length, r, i;

        if(!this.innerCt){
            target.addClass('ux-row-layout-ct');
            this.innerCt = target.createChild({cls:'x-row-inner'});
        }
        this.renderAll(ct, this.innerCt);

        var size = target.getViewSize();

        if(size.width < 1 && size.height < 1){ // display none?
            return;
        }

        var h = size.height - target.getPadding('tb'),
            ph = h;

        this.innerCt.setSize({height:h});

        // some rows can be percentages while others are fixed
        // so we need to make 2 passes

        for(i = 0; i < len; i++){
            r = rs[i];
            if(!r.rowHeight){
                ph -= (r.getSize().height + r.getEl().getMargins('tb'));
            }
        }

        ph = ph < 0 ? 0 : ph;

        for(i = 0; i < len; i++){
            r = rs[i];
            if(r.rowHeight){
                r.setSize({height: Math.floor(r.rowHeight*ph) - r.getEl().getMargins('tb')});
            }
        }
    }

    
/**
     * @property activeItem
     * @hide
     */
});

Ext.Container.LAYOUTS['ux.row'] = Ext.ux.layout.RowLayout;