/*
This file is part of Ext JS 4.2

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: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * This is a layout that inherits the anchoring of {@link Ext.layout.container.Anchor} and adds the
 * ability for x/y positioning using the standard x and y component config options.
 *
 * This class is intended to be extended or created via the {@link Ext.container.Container#layout layout}
 * configuration property.  See {@link Ext.container.Container#layout} for additional details.
 *
 *     @example
 *     Ext.create('Ext.form.Panel', {
 *         title: 'Absolute Layout',
 *         width: 300,
 *         height: 275,
 *         layout: {
 *             type: 'absolute'
 *             // layout-specific configs go here
 *             //itemCls: 'x-abs-layout-item',
 *         },
 *         url:'save-form.php',
 *         defaultType: 'textfield',
 *         items: [{
 *             x: 10,
 *             y: 10,
 *             xtype:'label',
 *             text: 'Send To:'
 *         },{
 *             x: 80,
 *             y: 10,
 *             name: 'to',
 *             anchor:'90%'  // anchor width by percentage
 *         },{
 *             x: 10,
 *             y: 40,
 *             xtype:'label',
 *             text: 'Subject:'
 *         },{
 *             x: 80,
 *             y: 40,
 *             name: 'subject',
 *             anchor: '90%'  // anchor width by percentage
 *         },{
 *             x:0,
 *             y: 80,
 *             xtype: 'textareafield',
 *             name: 'msg',
 *             anchor: '100% 100%'  // anchor width and height
 *         }],
 *         renderTo: Ext.getBody()
 *     });
 */
Ext.define('Ext.layout.container.Absolute', {

    /* Begin Definitions */

    alias: 'layout.absolute',
    extend: 'Ext.layout.container.Anchor',
    alternateClassName: 'Ext.layout.AbsoluteLayout',

    /* End Definitions */

    targetCls: Ext.baseCSSPrefix + 'abs-layout-ct',
    itemCls: Ext.baseCSSPrefix + 'abs-layout-item',

    /**
     * @cfg {Boolean} ignoreOnContentChange
     * True indicates that changes to one item in this layout do not effect the layout in
     * general. This may need to be set to false if {@link Ext.Component#autoScroll}
     * is enabled for the container.
     */
    ignoreOnContentChange: true,

    type: 'absolute',

    // private
    adjustWidthAnchor: function(value, childContext) {
        var padding = this.targetPadding,
            x = childContext.getStyle('left');

        return value - x + padding.left;
    },

    // private
    adjustHeightAnchor: function(value, childContext) {
        var padding = this.targetPadding,
            y = childContext.getStyle('top');

        return value - y + padding.top;
    },

    isItemLayoutRoot: function (item) {
        return this.ignoreOnContentChange || this.callParent(arguments);
    },

    isItemShrinkWrap: function (item) {
        return true;
    },

    beginLayout: function (ownerContext) {
        var me = this,
            target = me.getTarget();

        me.callParent(arguments);

        // Do not set position: relative; when the absolute layout target is the body
        if (target.dom !== document.body) {
            target.position();
        }

        me.targetPadding = ownerContext.targetContext.getPaddingInfo();
    },

    isItemBoxParent: function (itemContext) {
        return true;
    },

    onContentChange: function () {
        if (this.ignoreOnContentChange) {
            return false;
        }
        return this.callParent(arguments);
    },

    calculateContentSize: function (ownerContext, dimensions) {
        var me = this,
            containerDimensions = (dimensions || 0) |
                   ((ownerContext.widthModel.shrinkWrap ? 1 : 0) |
                    (ownerContext.heightModel.shrinkWrap ? 2 : 0)),
            calcWidth = (containerDimensions & 1) || undefined,
            calcHeight = (containerDimensions & 2) || undefined,
            childItems = ownerContext.childItems,
            length = childItems.length,
            contentHeight = 0,
            contentWidth = 0,
            needed = 0,
            props = ownerContext.props,
            targetPadding, child, childContext, height, i, margins, width;

        if (calcWidth) {
            if (isNaN(props.contentWidth)) {
                ++needed;
            } else {
                calcWidth = undefined;
            }
        }
        if (calcHeight) {
            if (isNaN(props.contentHeight)) {
                ++needed;
            } else {
                calcHeight = undefined;
            }
        }

        if (needed) {
            for (i = 0; i < length; ++i) {
                childContext = childItems[i];
                child = childContext.target;
                height = calcHeight && childContext.getProp('height');
                width = calcWidth && childContext.getProp('width');
                margins = childContext.getMarginInfo();

                height += margins.bottom;
                width  += margins.right;

                contentHeight = Math.max(contentHeight, (child.y || 0) + height);
                contentWidth = Math.max(contentWidth, (child.x || 0) + width);

                if (isNaN(contentHeight) && isNaN(contentWidth)) {
                    me.done = false;
                    return;
                }
            }

            if (calcWidth || calcHeight) {
                targetPadding = ownerContext.targetContext.getPaddingInfo();
            }
            if (calcWidth && !ownerContext.setContentWidth(contentWidth + targetPadding.width)) {
                me.done = false;
            }
            if (calcHeight && !ownerContext.setContentHeight(contentHeight + targetPadding.height)) {
                me.done = false;
            }

            /* add a '/' to turn on this log ('//* enables, '/*' disables)
            if (me.done) {
                var el = ownerContext.targetContext.el.dom;
                Ext.log(this.owner.id, '.contentSize: ', contentWidth, 'x', contentHeight,
                    ' => scrollSize: ', el.scrollWidth, 'x', el.scrollHeight);
            }/**/
        }
    }
});
