add extjs 6.0.1 sources

[extjs.git] / extjs / packages / core / src / event / gesture / MultiTouch.js

/**\r
 * A base class for gesture recognizers that involve multiple simultaneous contact points\r
 * between the screen and the input-device, e.g. 'pinch' and 'rotate'\r
 * @abstract\r
 * @private\r
 */\r
Ext.define('Ext.event.gesture.MultiTouch', {\r
    extend: 'Ext.event.gesture.Recognizer',\r
\r
    requiredTouchesCount: 2,\r
\r
    isTracking: false,\r
\r
    isStarted: false,\r
\r
    onTouchStart: function(e) {\r
        var requiredTouchesCount = this.requiredTouchesCount,\r
            touches = e.touches,\r
            touchesCount = touches.length;\r
\r
        if (touchesCount === requiredTouchesCount) {\r
            this.start(e);\r
        }\r
        else if (touchesCount > requiredTouchesCount) {\r
            this.end(e);\r
        }\r
    },\r
\r
    onTouchEnd: function(e) {\r
        this.end(e);\r
    },\r
\r
    onTouchCancel: function(e) {\r
        this.end(e, true);\r
        return false;\r
    },\r
\r
    start: function() {\r
        if (!this.isTracking) {\r
            this.isTracking = true;\r
            this.isStarted = false;\r
        }\r
    },\r
\r
    end: function(e, isCancel) {\r
        if (this.isTracking) {\r
            this.isTracking = false;\r
\r
            if (this.isStarted) {\r
                this.isStarted = false;\r
\r
                this[isCancel ? 'fireCancel' : 'fireEnd'](e);\r
            }\r
        }\r
    },\r
\r
    reset: function() {\r
        this.isTracking = this.isStarted = false;\r
    }\r
});\r