devextreme
Version:
JavaScript/TypeScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (esm/__internal/core/environment/init_mobile_viewport.js)
* Version: 25.2.7
* Build date: Tue May 05 2026
*
* Copyright (c) 2012 - 2026 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
import $ from "../../../core/renderer";
import devices from "../../core/m_devices";
import domAdapter from "../../core/m_dom_adapter";
import {
extend
} from "../../core/utils/m_extend";
import resizeCallbacks from "../../core/utils/m_resize_callbacks";
import {
getWidth,
setWidth
} from "../../core/utils/m_size";
import {
styleProp
} from "../../core/utils/m_style";
import supportUtils from "../../core/utils/m_support";
import {
getWindow
} from "../../core/utils/m_window";
import eventsEngine from "../../events/core/m_events_engine";
const window = getWindow();
export const initMobileViewport = function(options) {
options = extend({}, options);
let realDevice = devices.real();
const {
allowZoom: allowZoom
} = options;
const {
allowPan: allowPan
} = options;
const allowSelection = "allowSelection" in options ? options.allowSelection : "generic" === realDevice.platform;
if (!$("meta[name=viewport]").length) {
$("<meta>").attr("name", "viewport").appendTo("head")
}
const metaVerbs = ["width=device-width"];
const msTouchVerbs = [];
if (allowZoom) {
msTouchVerbs.push("pinch-zoom")
} else {
metaVerbs.push("initial-scale=1.0", "maximum-scale=1.0, user-scalable=no")
}
if (allowPan) {
msTouchVerbs.push("pan-x", "pan-y")
}
if (!allowPan && !allowZoom) {
$("html, body").css({
msContentZooming: "none",
msUserSelect: "none",
overflow: "hidden"
})
} else {
$("html").css("msOverflowStyle", "-ms-autohiding-scrollbar")
}
if (!allowSelection && supportUtils.supportProp("userSelect")) {
$(".dx-viewport").css(styleProp("userSelect"), "none")
}
$("meta[name=viewport]").attr("content", metaVerbs.join());
$("html").css("msTouchAction", msTouchVerbs.join(" ") || "none");
realDevice = devices.real();
if (supportUtils.touch) {
eventsEngine.off(domAdapter.getDocument(), ".dxInitMobileViewport");
eventsEngine.on(domAdapter.getDocument(), "dxpointermove.dxInitMobileViewport", e => {
const count = e.pointers.length;
const isTouchEvent = "touch" === e.pointerType;
const zoomDisabled = !allowZoom && count > 1;
const panDisabled = !allowPan && 1 === count && !e.isScrollingEvent;
if (isTouchEvent && (zoomDisabled || panDisabled)) {
e.preventDefault()
}
})
}
if (realDevice.ios) {
const isPhoneGap = "file:" === domAdapter.getLocation().protocol;
if (!isPhoneGap) {
resizeCallbacks.add(() => {
const windowWidth = getWidth(window);
setWidth($("body"), windowWidth)
})
}
}
if (realDevice.android) {
resizeCallbacks.add(() => {
setTimeout(() => {
const activeElement = domAdapter.getActiveElement();
if (activeElement.scrollIntoViewIfNeeded) {
activeElement.scrollIntoViewIfNeeded()
} else {
activeElement.scrollIntoView(false)
}
})
})
}
};