/*
This file is part of Ext JS 3.4

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-04-03 15:07:25
*/
/**
 * @class Ext.layout.BoxLayout
 * @extends Ext.layout.ContainerLayout
 * <p>Base Class for HBoxLayout and VBoxLayout Classes. Generally it should not need to be used directly.</p>
 */
Ext.layout.BoxLayout = Ext.extend(Ext.layout.ContainerLayout, {
    /**
     * @cfg {Object} defaultMargins
     * <p>If the individual contained items do not have a <tt>margins</tt>
     * property specified, the default margins from this property will be
     * applied to each item.</p>
     * <br><p>This property may be specified as an object containing margins
     * to apply in the format:</p><pre><code>
{
    top: (top margin),
    right: (right margin),
    bottom: (bottom margin),
    left: (left margin)
}</code></pre>
     * <p>This property may also be specified as a string containing
     * space-separated, numeric margin values. The order of the sides associated
     * with each value matches the way CSS processes margin values:</p>
     * <div class="mdetail-params"><ul>
     * <li>If there is only one value, it applies to all sides.</li>
     * <li>If there are two values, the top and bottom borders are set to the
     * first value and the right and left are set to the second.</li>
     * <li>If there are three values, the top is set to the first value, the left
     * and right are set to the second, and the bottom is set to the third.</li>
     * <li>If there are four values, they apply to the top, right, bottom, and
     * left, respectively.</li>
     * </ul></div>
     * <p>Defaults to:</p><pre><code>
     * {top:0, right:0, bottom:0, left:0}
     * </code></pre>
     */
    defaultMargins : {left:0,top:0,right:0,bottom:0},
    /**
     * @cfg {String} padding
     * <p>Sets the padding to be applied to all child items managed by this layout.</p>
     * <p>This property must be specified as a string containing
     * space-separated, numeric padding values. The order of the sides associated
     * with each value matches the way CSS processes padding values:</p>
     * <div class="mdetail-params"><ul>
     * <li>If there is only one value, it applies to all sides.</li>
     * <li>If there are two values, the top and bottom borders are set to the
     * first value and the right and left are set to the second.</li>
     * <li>If there are three values, the top is set to the first value, the left
     * and right are set to the second, and the bottom is set to the third.</li>
     * <li>If there are four values, they apply to the top, right, bottom, and
     * left, respectively.</li>
     * </ul></div>
     * <p>Defaults to: <code>"0"</code></p>
     */
    padding : '0',
    // documented in subclasses
    pack : 'start',

    // private
    monitorResize : true,
    type: 'box',
    scrollOffset : 0,
    extraCls : 'x-box-item',
    targetCls : 'x-box-layout-ct',
    innerCls : 'x-box-inner',

    constructor : function(config){
        Ext.layout.BoxLayout.superclass.constructor.call(this, config);

        if (Ext.isString(this.defaultMargins)) {
            this.defaultMargins = this.parseMargins(this.defaultMargins);
        }
        
        var handler = this.overflowHandler;
        
        if (typeof handler == 'string') {
            handler = {
                type: handler
            };
        }
        
        var handlerType = 'none';
        if (handler && handler.type != undefined) {
            handlerType = handler.type;
        }
        
        var constructor = Ext.layout.boxOverflow[handlerType];
        if (constructor[this.type]) {
            constructor = constructor[this.type];
        }
        
        this.overflowHandler = new constructor(this, handler);
    },

    /**
     * @private
     * Runs the child box calculations and caches them in childBoxCache. Subclasses can used these cached values
     * when laying out
     */
    onLayout: function(container, target) {
        Ext.layout.BoxLayout.superclass.onLayout.call(this, container, target);

        var tSize = this.getLayoutTargetSize(),
            items = this.getVisibleItems(container),
            calcs = this.calculateChildBoxes(items, tSize),
            boxes = calcs.boxes,
            meta  = calcs.meta;
        
        //invoke the overflow handler, if one is configured
        if (tSize.width > 0) {
            var handler = this.overflowHandler,
                method  = meta.tooNarrow ? 'handleOverflow' : 'clearOverflow';
            
            var results = handler[method](calcs, tSize);
            
            if (results) {
                if (results.targetSize) {
                    tSize = results.targetSize;
                }
                
                if (results.recalculate) {
                    items = this.getVisibleItems(container);
                    calcs = this.calculateChildBoxes(items, tSize);
                    boxes = calcs.boxes;
                }
            }
        }
        
        /**
         * @private
         * @property layoutTargetLastSize
         * @type Object
         * Private cache of the last measured size of the layout target. This should never be used except by
         * BoxLayout subclasses during their onLayout run.
         */
        this.layoutTargetLastSize = tSize;
        
        /**
         * @private
         * @property childBoxCache
         * @type Array
         * Array of the last calculated height, width, top and left positions of each visible rendered component
         * within the Box layout.
         */
        this.childBoxCache = calcs;
        
        this.updateInnerCtSize(tSize, calcs);
        this.updateChildBoxes(boxes);

        // Putting a box layout into an overflowed container is NOT correct and will make a second layout pass necessary.
        this.handleTargetOverflow(tSize, container, target);
    },

    /**
     * Resizes and repositions each child component
     * @param {Array} boxes The box measurements
     */
    updateChildBoxes: function(boxes) {
        for (var i = 0, length = boxes.length; i < length; i++) {
            var box  = boxes[i],
                comp = box.component;
            
            if (box.dirtySize) {
                comp.setSize(box.width, box.height);
            }
            // Don't set positions to NaN
            if (isNaN(box.left) || isNaN(box.top)) {
                continue;
            }
            
            comp.setPosition(box.left, box.top);
        }
    },

    /**
     * @private
     * Called by onRender just before the child components are sized and positioned. This resizes the innerCt
     * to make sure all child items fit within it. We call this before sizing the children because if our child
     * items are larger than the previous innerCt size the browser will insert scrollbars and then remove them
     * again immediately afterwards, giving a performance hit.
     * Subclasses should provide an implementation.
     * @param {Object} currentSize The current height and width of the innerCt
     * @param {Array} calculations The new box calculations of all items to be laid out
     */
    updateInnerCtSize: function(tSize, calcs) {
        var align   = this.align,
            padding = this.padding,
            width   = tSize.width,
            height  = tSize.height;
        
        if (this.type == 'hbox') {
            var innerCtWidth  = width,
                innerCtHeight = calcs.meta.maxHeight + padding.top + padding.bottom;

            if (align == 'stretch') {
                innerCtHeight = height;
            } else if (align == 'middle') {
                innerCtHeight = Math.max(height, innerCtHeight);
            }
        } else {
            var innerCtHeight = height,
                innerCtWidth  = calcs.meta.maxWidth + padding.left + padding.right;

            if (align == 'stretch') {
                innerCtWidth = width;
            } else if (align == 'center') {
                innerCtWidth = Math.max(width, innerCtWidth);
            }
        }

        this.innerCt.setSize(innerCtWidth || undefined, innerCtHeight || undefined);
    },

    /**
     * @private
     * This should be called after onLayout of any BoxLayout subclass. If the target's overflow is not set to 'hidden',
     * we need to lay out a second time because the scrollbars may have modified the height and width of the layout
     * target. Having a Box layout inside such a target is therefore not recommended.
     * @param {Object} previousTargetSize The size and height of the layout target before we just laid out
     * @param {Ext.Container} container The container
     * @param {Ext.Element} target The target element
     */
    handleTargetOverflow: function(previousTargetSize, container, target) {
        var overflow = target.getStyle('overflow');

        if (overflow && overflow != 'hidden' &&!this.adjustmentPass) {
            var newTargetSize = this.getLayoutTargetSize();
            if (newTargetSize.width != previousTargetSize.width || newTargetSize.height != previousTargetSize.height){
                this.adjustmentPass = true;
                this.onLayout(container, target);
            }
        }

        delete this.adjustmentPass;
    },

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

    /**
     * @private
     * Returns all items that are both rendered and visible
     * @return {Array} All matching items
     */
    getVisibleItems: function(ct) {
        var ct  = ct || this.container,
            t   = ct.getLayoutTarget(),
            cti = ct.items.items,
            len = cti.length,

            i, c, items = [];

        for (i = 0; i < len; i++) {
            if((c = cti[i]).rendered && this.isValidParent(c, t) && c.hidden !== true  && c.collapsed !== true && c.shouldLayout !== false){
                items.push(c);
            }
        }

        return items;
    },

    // private
    renderAll : function(ct, target) {
        if (!this.innerCt) {
            // the innerCt prevents wrapping and shuffling while the container is resizing
            this.innerCt = target.createChild({cls:this.innerCls});
            this.padding = this.parseMargins(this.padding);
        }
        Ext.layout.BoxLayout.superclass.renderAll.call(this, ct, this.innerCt);
    },

    getLayoutTargetSize : function() {
        var target = this.container.getLayoutTarget(), ret;
        
        if (target) {
            ret = target.getViewSize();

            // IE in strict mode will return a width of 0 on the 1st pass of getViewSize.
            // Use getStyleSize to verify the 0 width, the adjustment pass will then work properly
            // with getViewSize
            if (Ext.isIE9m && Ext.isStrict && ret.width == 0){
                ret =  target.getStyleSize();
            }

            ret.width  -= target.getPadding('lr');
            ret.height -= target.getPadding('tb');
        }
        
        return ret;
    },

    // private
    renderItem : function(c) {
        if(Ext.isString(c.margins)){
            c.margins = this.parseMargins(c.margins);
        }else if(!c.margins){
            c.margins = this.defaultMargins;
        }
        Ext.layout.BoxLayout.superclass.renderItem.apply(this, arguments);
    },
    
    /**
     * @private
     */
    destroy: function() {
        Ext.destroy(this.overflowHandler);
        
        Ext.layout.BoxLayout.superclass.destroy.apply(this, arguments);
    }
});

/**
 * @class Ext.layout.boxOverflow.None
 * @extends Object
 * Base class for Box Layout overflow handlers. These specialized classes are invoked when a Box Layout
 * (either an HBox or a VBox) has child items that are either too wide (for HBox) or too tall (for VBox)
 * for its container.
 */

Ext.layout.boxOverflow.None = Ext.extend(Object, {
    constructor: function(layout, config) {
        this.layout = layout;
        
        Ext.apply(this, config || {});
    },
    
    handleOverflow: Ext.emptyFn,
    
    clearOverflow: Ext.emptyFn
});


Ext.layout.boxOverflow.none = Ext.layout.boxOverflow.None;
