/*
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 class encapsulates a drawn text item as rendered by the Ext.draw package within a Component which can be
 * then used anywhere in an ExtJS application just like any other Component.
 *
 * ## Example usage
 *
 *     @example
 *     Ext.create('Ext.panel.Panel', {
 *         title: 'Panel with VerticalTextItem',
 *         width: 300,
 *         height: 200,
 *         lbar: {
 *             layout: {
 *                 align: 'center'
 *             },
 *             items: [{
 *                 xtype: 'text',
 *                 text: 'Sample VerticalTextItem',
 *                 degrees: 90
 *             }]
 *         },
 *         renderTo: Ext.getBody()
 *     });
 *
 * @constructor
 * Creates a new Text Component
 * @param {Object} text A config object containing a `text` property, a `degrees` property,
 * and, optionally, a `styleSelector` property which specifies a selector which provides CSS rules to
 * give font family, size and color to the drawn text.
 */
Ext.define('Ext.draw.Text', {
    extend: 'Ext.draw.Component',
    uses: ['Ext.util.CSS'],
    alias: 'widget.text',

    /**
     * @cfg {String} text
     * The text to display (html tags are <b>not</b> accepted)
     */
    text: '',

    /**
     * @cfg {String} styleSelector
     * A CSS selector string which matches a style rule in the document stylesheet from which
     * the text's font properties are read.
     *
     * **Drawn** text is not styled by CSS, but by properties set during its construction, so these styles
     * must be programatically read from a stylesheet rule found via a selector at construction time.
     */

    /**
     * @cfg {Number} degrees
     * The angle by which to initially rotate the text clockwise. Defaults to zero.
     */

    focusable: false,
    viewBox: false,
    autoSize: true,
    baseCls: Ext.baseCSSPrefix + 'surface ' + Ext.baseCSSPrefix + 'draw-text',

    initComponent: function() {
        var me = this;

        me.textConfig = Ext.apply({
            type: 'text',
            text: me.text,
            rotate: {
                degrees: me.degrees || 0
            }
        }, me.textStyle);
        Ext.apply(me.textConfig, me.getStyles(me.styleSelectors || me.styleSelector));

        // Surface is created from the *initialConfig*, not the current object state,
        // So the generated items must go into the initialConfig
        me.initialConfig.items = [me.textConfig];
        me.callParent(arguments);
    },

    /**
     * @private
     * Accumulates a style object based upon the styles specified in document stylesheets
     * by an array of CSS selectors
     */
    getStyles: function(selectors) {
        selectors = Ext.Array.from(selectors);
        var i = 0,
            len = selectors.length,
            rule,
            style,
            prop,
            result = {};

        for (; i < len; i++) {
            // Get the style rule which exactly matches the selector.
            rule = Ext.util.CSS.getRule(selectors[i]);
            if (rule) {
                style = rule.style;
                if (style) {
                    Ext.apply(result, {
                        'font-family': style.fontFamily,
                        'font-weight': style.fontWeight,
                        'line-height': style.lineHeight,
                        'font-size': style.fontSize,
                        fill: style.color
                    });
                }
            }
        }
        return result;
    },

    /**
     * Sets the clockwise rotation angle relative to the horizontal axis.
     * @param {Number} degrees The clockwise angle (in degrees) from the horizontal axis
     * by which the text should be rotated.
     */
    setAngle: function(degrees) {
        var me = this,
            surface,
            sprite;
            
        if (me.rendered) {
            surface = me.surface;
            sprite = surface.items.items[0];

            me.degrees = degrees;
            sprite.setAttributes({
                rotate: {
                    degrees: degrees
                }
            }, true);
            if (me.autoSize || me.viewBox) {
                me.updateLayout();
            }
        } else {
            me.degrees = degrees;
        }
    },

    /**
     * Updates this item's text.
     * @param {String} t The text to display (html **not** accepted).
     */
    setText: function(text) {
        var me = this,
            surface,
            sprite;
            
        if (me.rendered) {
            surface = me.surface;
            sprite = surface.items.items[0];

            me.text = text || '';
            surface.remove(sprite);
            me.textConfig.type = 'text';
            me.textConfig.text = me.text;
            sprite = surface.add(me.textConfig);
            sprite.setAttributes({
                rotate: {
                    degrees: me.degrees
                }
            }, true);
            if (me.autoSize || me.viewBox) {
                me.updateLayout();
            }
        } else {
            me.on({
                render: function() {
                    me.setText(text);
                },
                single: true
            });
        }
    }
});
