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    var FIT_UP_WSCRIPT = 'Set WshShell = WScript.CreateObject("WScript.Shell")\nWshShell.SendKeys "%/"';

    var showSettingsWindow = Tree.parse({ config: { singleton: true }, param: [, SCRIPT_NAME], style: { alignChildren: ['fill', ''] }, statictext: ['tips', , '右键 Fit 功能需要文件写入权限'], group: { style: { orientation: 'row', alignChildren: ['fill', ''] }, button1: ['cancel', , '不用了'], button2: ['confirm', , '去设置'] } }),
        elements = Tree.parse({ param: [, , , { resizeable: true }], style: { margins: 5, alignChildren: ['fill', ''] }, group: { style: { spacing: 5, alignChildren: ['fill', ''] }, rectbutton1: { param: ['zoomIn', [0, 0, 25, 25], '缩', { enableStroke: false }], style: { alignment: ['left', ''] } }, slider: { param: ['zoomRatio', undefined, 0, 1, 100], style: { preferredSize: [-1, 25], helpTip: SCRIPT_NAME + ' ' + SCRIPT_VERSION + ' | ' + SCRIPT_DATE + ' | ' + SCRIPT_AUTHOR } }, rectbutton2: { param: ['zoomOut', [0, 0, 25, 25], '放', { enableStroke: false }], style: { alignment: ['right', ''] } } } });

    var zoomInButton = elements.getElementById('zoomIn'),
        zoomRatioSlider = elements.getElementById('zoomRatio'),
        zoomOutButton = elements.getElementById('zoomOut');

    runScript();

    function addRightClickEvent(element, handle) {
        element.addEventListener('click', function (event) {
            if (isRightClick(event)) handle();
        });
    }

    function calculateZoomInValue(value) {
        var result = Math.ceil(Math.ceil(value) / STEP_DEFAULT) * STEP_DEFAULT - STEP_DEFAULT;
        return result < 1 ? 1 : result;
    }

    function calculateZoomOutValue(value) {
        var result = Math.floor(Math.floor(value) / STEP_DEFAULT) * STEP_DEFAULT + STEP_DEFAULT;
        return result > 100 ? 100 : result;
    }

    function calculateZoomRatioValue(value) {
        return Math.floor(value * 100) / 100;
    }

    function canWriteFile() {
        var mainSectionName = parseFloat(app.version) > 12.0 ? 'Main Pref Section v2' : 'Main Pref Section';
        var securitySetting = app.preferences.getPrefAsLong(mainSectionName, 'Pref_SCRIPTING_FILE_NETWORK_SECURITY');
        return securitySetting === 1;
    }

    function closeWindow() {
        this.window.close();
    }

    function createPath() {
        return [].join.call(arguments, '/');
    }

    function createWScriptFile() {
        var file = new File(WSCRIPT_FILE_PATH);
        return file.exists ? file : writeFile(file, FIT_UP_WSCRIPT);
    }

    function createWScriptFolder() {
        var folder = new Folder(WSCRIPT_PATH_DEFAULT);
        return folder.exists ? folder : folder.create();
    }

    function createZoom(calculator) {
        return function () {
            if (hasActiveView()) setViewRatio((zoomRatioSlider.value = calculator(zoomRatioSlider.value)) / 100);
        };
    }

    function fitUpView() {
        if (!hasActiveView()) return;
        if (!canWriteFile()) return initSettingsWindow();
        var WScriptFile = getWScriptFile();
        WScriptFile && runWScript(WScriptFile) && syncZoomRatio();
    }

    function getViewRatio() {
        return app.activeViewer.views['0'].options.zoom;
    }

    function getWScriptFile() {
        return createWScriptFolder() && createWScriptFile();
    }

    function hasActiveView() {
        return !!app.activeViewer;
    }

    function initSettingsWindow() {
        var elements = showSettingsWindow();
        var confirmButton = elements.getElementById('confirm');
        var cancelButton = elements.getElementById('cancel');
        elements.defaultElement = confirmButton;
        elements.cancelElement = cancelButton;
        confirmButton.onClick = showPreferencesWindow;
        cancelButton.onClick = closeWindow;
    }

    function isRightClick(event) {
        return event.button === 2;
    }

    function isWindowsSystem() {
        return /Windows/.test($.os);
    }

    function runScript() {
        hasActiveView() && syncZoomRatio();
        zoomInButton.onClick = createZoom(calculateZoomInValue);
        zoomOutButton.onClick = createZoom(calculateZoomOutValue);
        zoomRatioSlider.onChange = zoomRatioSlider.onChanging = createZoom(calculateZoomRatioValue);
        isWindowsSystem() && addRightClickEvent(elements, fitUpView);
    }

    function runWScript(file) {
        return file.execute(), file.execute();
    }

    function setViewRatio(value) {
        app.activeViewer.views['0'].options.zoom = value;
    }

    function showPreferencesWindow() {
        closeWindow.call(this);
        app.executeCommand(parseFloat(app.version) > 16.0 ? 3131 : 2359);
    }

    function syncZoomRatio() {
        zoomRatioSlider.value = getViewRatio() * 100;
    }

    function writeFile(file, content) {
        file.encoding = 'utf-8';
        return file.open('w') && file.write(content) && file.close() && file;
    }
})(this);