add extjs 6.0.1 sources

[extjs.git] / extjs / packages / core / src / fx / easing / BoundMomentum.js

/**\r
 * @private\r
 *\r
 * This easing is typically used for {@link Ext.scroll.Scroller}. It's a combination of\r
 * {@link Ext.fx.easing.Momentum} and {@link Ext.fx.easing.Bounce}, which emulates deceleration when the animated element\r
 * is still within its boundary, then bouncing back (snapping) when it's out-of-bound.\r
 */\r
\r
Ext.define('Ext.fx.easing.BoundMomentum', {\r
    extend: 'Ext.fx.easing.Abstract',\r
\r
    requires: [\r
        'Ext.fx.easing.Momentum',\r
        'Ext.fx.easing.Bounce'\r
    ],\r
\r
    config: {\r
        /**\r
         * @cfg {Object} momentum\r
         * A valid config object for {@link Ext.fx.easing.Momentum}\r
         * @accessor\r
         */\r
        momentum: null,\r
\r
        /**\r
         * @cfg {Object} bounce\r
         * A valid config object for {@link Ext.fx.easing.Bounce}\r
         * @accessor\r
         */\r
        bounce: null,\r
\r
        minMomentumValue: 0,\r
\r
        maxMomentumValue: 0,\r
\r
        /**\r
         * @cfg {Number} minVelocity\r
         * The minimum velocity to end this easing\r
         * @accessor\r
         */\r
        minVelocity: 0.01,\r
\r
        /**\r
         * @cfg {Number} startVelocity\r
         * The start velocity\r
         * @accessor\r
         */\r
        startVelocity: 0\r
    },\r
\r
    applyMomentum: function(config, currentEasing) {\r
        return Ext.factory(config, Ext.fx.easing.Momentum, currentEasing);\r
    },\r
\r
    applyBounce: function(config, currentEasing) {\r
        return Ext.factory(config, Ext.fx.easing.Bounce, currentEasing);\r
    },\r
\r
    updateStartTime: function(startTime) {\r
        this.getMomentum().setStartTime(startTime);\r
\r
        this.callParent(arguments);\r
    },\r
\r
    updateStartVelocity: function(startVelocity) {\r
        this.getMomentum().setStartVelocity(startVelocity);\r
    },\r
\r
    updateStartValue: function(startValue) {\r
        this.getMomentum().setStartValue(startValue);\r
    },\r
\r
    reset: function() {\r
        this.lastValue = null;\r
\r
        this.isBouncingBack = false;\r
\r
        this.isOutOfBound = false;\r
\r
        return this.callParent(arguments);\r
    },\r
\r
    getValue: function() {\r
        var momentum = this.getMomentum(),\r
            bounce = this.getBounce(),\r
            startVelocity = momentum.getStartVelocity(),\r
            direction = startVelocity > 0 ? 1 : -1,\r
            minValue = this.getMinMomentumValue(),\r
            maxValue = this.getMaxMomentumValue(),\r
            boundedValue = (direction == 1) ? maxValue : minValue,\r
            lastValue = this.lastValue,\r
            value, velocity;\r
\r
        if (startVelocity === 0) {\r
            return this.getStartValue();\r
        }\r
\r
        if (!this.isOutOfBound) {\r
            value = momentum.getValue();\r
            velocity = momentum.getVelocity();\r
\r
            if (Math.abs(velocity) < this.getMinVelocity()) {\r
                this.isEnded = true;\r
            }\r
\r
            if (value >= minValue && value <= maxValue) {\r
                return value;\r
            }\r
\r
            this.isOutOfBound = true;\r
\r
            bounce.setStartTime(Ext.Date.now())\r
                  .setStartVelocity(velocity)\r
                  .setStartValue(boundedValue);\r
        }\r
\r
        value = bounce.getValue();\r
\r
        if (!this.isEnded) {\r
            if (!this.isBouncingBack) {\r
                if (lastValue !== null) {\r
                    if ((direction == 1 && value < lastValue) || (direction == -1 && value > lastValue)) {\r
                        this.isBouncingBack = true;\r
                    }\r
                }\r
            }\r
            else {\r
                if (Math.round(value) == boundedValue) {\r
                    this.isEnded = true;\r
                }\r
            }\r
        }\r
\r
        this.lastValue = value;\r
\r
        return value;\r
    }\r
});\r