sdkjs/common/device_scale.js

/*
 * (c) Copyright Ascensio System SIA 2010-2024
 *
 * This program is a free software product. You can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License (AGPL)
 * version 3 as published by the Free Software Foundation. In accordance with
 * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
 * that Ascensio System SIA expressly excludes the warranty of non-infringement
 * of any third-party rights.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
 * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
 *
 * You can contact Ascensio System SIA at 20A-6 Ernesta Birznieka-Upish
 * street, Riga, Latvia, EU, LV-1050.
 *
 * The  interactive user interfaces in modified source and object code versions
 * of the Program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU AGPL version 3.
 *
 * Pursuant to Section 7(b) of the License you must retain the original Product
 * logo when distributing the program. Pursuant to Section 7(e) we decline to
 * grant you any rights under trademark law for use of our trademarks.
 *
 * All the Product's GUI elements, including illustrations and icon sets, as
 * well as technical writing content are licensed under the terms of the
 * Creative Commons Attribution-ShareAlike 4.0 International. See the License
 * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
 *
 */

"use strict";
(function (window, undefined) {
	var supportedScaleValues = [1, 1.25, 1.5, 1.75, 2, 2.25, 2.5, 2.75, 3, 3.5, 4, 4.5, 5];
	if (window["AscDesktopEditor"] && window["AscDesktopEditor"]["GetSupportedScaleValues"])
		supportedScaleValues = window["AscDesktopEditor"]["GetSupportedScaleValues"]();

	// uncomment to debug all scales
	//supportedScaleValues = [];

	var isCorrectApplicationScaleEnabled = (function(){

		if (supportedScaleValues.length === 0)
			return false;

		var userAgent = navigator.userAgent.toLowerCase();
		var isAndroid = (userAgent.indexOf("android") > -1);
		var isIE = (userAgent.indexOf("msie") > -1 || userAgent.indexOf("trident") > -1 || userAgent.indexOf("edge") > -1);
		var isChrome = !isIE && (userAgent.indexOf("chrome") > -1);
		var isOperaOld = (!!window.opera);
		var isMobile = /android|avantgo|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od|ad)|iris|kindle|lge |maemo|midp|mmp|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(navigator.userAgent || navigator.vendor || window.opera);

		if (isAndroid || !isChrome || isOperaOld || isMobile || !document || !document.firstElementChild || !document.body)
			return false;

		return true;

	})();

	window['AscCommon'] = window['AscCommon'] || {};
	window['AscCommon'].checkDeviceScale = function()
	{
		var retValue = {
			zoom: 1,
			devicePixelRatio: window.devicePixelRatio,
			applicationPixelRatio: window.devicePixelRatio,
			correct : false
		};

		if (!isCorrectApplicationScaleEnabled)
			return retValue;

		var systemScaling = window.devicePixelRatio;
		var bestIndex = 0;
		var bestDistance = Math.abs(supportedScaleValues[0] - systemScaling);
		var currentDistance = 0;
		for (var i = 1, len = supportedScaleValues.length; i < len; i++)
		{
			if (true)
			{
				// это "подстройка под интерфейс" - после убирания этого в общий код - удалить
				if (Math.abs(supportedScaleValues[i] - systemScaling) > 0.0001)
				{
					if (supportedScaleValues[i] > (systemScaling - 0.0001))
						break;
				}
			}

			currentDistance = Math.abs(supportedScaleValues[i] - systemScaling);
			if (currentDistance < (bestDistance - 0.0001))
			{
				bestDistance = currentDistance;
				bestIndex = i;
			}
		}

		retValue.applicationPixelRatio = supportedScaleValues[bestIndex];
		if (Math.abs(retValue.devicePixelRatio - retValue.applicationPixelRatio) > 0.01)
		{
			retValue.zoom = retValue.devicePixelRatio / retValue.applicationPixelRatio;
			retValue.correct = true;
		}
		return retValue;
	};

	var oldZoomValue = 1;
	window['AscCommon'].correctApplicationScale = function(zoomValue)
	{
		if (!zoomValue.correct && Math.abs(zoomValue.zoom - oldZoomValue) < 0.0001)
			return;
		oldZoomValue = zoomValue.zoom;
		var firstElemStyle = document.firstElementChild.style;
		if (Math.abs(oldZoomValue - 1) < 0.001)
			firstElemStyle.zoom = "normal";
		else
			firstElemStyle.zoom = 1.0 / oldZoomValue;
	};
})(window);