Patch Tool Selection Fade

/*
<javascriptresource>
<name>Patch selection tracking</name>
</javascriptresource>
*/
#target photoshop
var UUID = '74551bc6-6224-4437-a04d-17ea9b12728e',
    s2t = stringIDToTypeID,
    t2s = typeIDToStringID,
    cfg = new Config();
try {
    var evt = arguments[1];
    if (t2s(evt) == 'patchSelection') {
        var descriptor = new ActionDescriptor();
        descriptor.putUnitDouble(s2t("opacity"), s2t("percentUnit"), cfg.getScriptSettings());
        descriptor.putEnumerated(s2t("mode"), s2t("blendMode"), s2t("normal"));
        executeAction(s2t("fade"), descriptor, DialogModes.NO);
    }
} catch (e) { }
if (!evt) {
    dialogWindow();
}
function dialogWindow() {
    var w = new Window("dialog {text: 'Patch selection tracking',alignChildren:['fill','top']}"),
        stFade = w.add("statictext {text: 'Fade patch:'}"),
        gFade = w.add("group"),
        sl = gFade.add("slider {minvalue: 0, maxvalue: 100, preferredSize: [200,-1] }"),
        st = gFade.add("statictext {text: '000'}"),
        bnNotifier = w.add("button"),
        g = w.add("group {alignChildren:['center', 'center']}"),
        bnOk = g.add("button {text:'Ok'}"),
        evt = new Events();
    bnNotifier.onClick = function () {
        if (evt.checkEvents()) evt.removeEvents() else evt.addEvents()
        setEnabledButtonValue()
    }
    sl.addEventListener('keyup', handler)
    sl.addEventListener('changing', handler)
    function handler(evt) {
        sl.value = st.text = Math.round(sl.value)
    }
    bnOk.onClick = function () {
        cfg.putScriptSettings(sl.value)
        w.close()
    }
    w.onShow = function () {
        sl.value = cfg.getScriptSettings();
        sl.dispatchEvent(new UIEvent('changing'))
        setEnabledButtonValue()
    }
    function setEnabledButtonValue() {
        var enabled = evt.checkEvents()
        bnNotifier.text = enabled ? 'Disable patch selection tracking' : 'Enable patch selection tracking'
        bnNotifier.graphics.foregroundColor = enabled ? bnNotifier.graphics.newPen(bnNotifier.graphics.PenType.SOLID_COLOR, [1, 0, 0, 1], 1) : bnNotifier.graphics.newPen(bnNotifier.graphics.PenType.SOLID_COLOR, [0, 0.8, 0, 1], 1)
    }
    w.show()
}
function Config() {
    this.getScriptSettings = function () {
        var d = new ActionDescriptor();
        try { d = getCustomOptions(UUID) } catch (e) { }
        if (d.count) return d.getInteger(s2t('fade'));
        return 50
    }
    this.putScriptSettings = function (fade) {
        var d = new ActionDescriptor();
        d.putInteger(s2t('fade'), fade);
        putCustomOptions(UUID, d);
    }
}
function Events() {
    var f = File($.fileName);
    this.addEvents = function () {
        app.notifiersEnabled = true
        app.notifiers.add('patchSelection', f)
    }
    this.removeEvents = function () {
        for (var i = 0; i < app.notifiers.length; i++) {
            var ntf = app.notifiers[i]
            if (ntf.eventFile.name == f.name) { ntf.remove(); i--; }
        }
    }
    this.checkEvents = function () {
        for (var i = 0; i < app.notifiers.length; i++) {
            if (app.notifiers[i].eventFile.name == f.name) return true
        }
        return false
    }
}