devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
70 lines (69 loc) • 2.27 kB
JavaScript
/**
* DevExtreme (core/utils/resize_callbacks.js)
* Version: 20.1.7
* Build date: Tue Aug 25 2020
*
* Copyright (c) 2012 - 2020 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
;
var windowUtils = require("./window");
var domAdapter = require("../dom_adapter");
var Callbacks = require("./callbacks");
var readyCallbacks = require("./ready_callbacks");
var callOnce = require("./call_once");
var resizeCallbacks = function() {
var prevSize;
var callbacks = Callbacks();
var originalCallbacksAdd = callbacks.add;
var originalCallbacksRemove = callbacks.remove;
if (!windowUtils.hasWindow()) {
return callbacks
}
var formatSize = function() {
var window = windowUtils.getWindow();
return {
width: window.innerWidth,
height: window.innerHeight
}
};
var handleResize = function() {
var now = formatSize();
if (now.width === prevSize.width && now.height === prevSize.height) {
return
}
var changedDimension;
if (now.width === prevSize.width) {
changedDimension = "height"
}
if (now.height === prevSize.height) {
changedDimension = "width"
}
prevSize = now;
callbacks.fire(changedDimension)
};
var setPrevSize = callOnce(function() {
prevSize = formatSize()
});
var removeListener;
callbacks.add = function() {
var result = originalCallbacksAdd.apply(callbacks, arguments);
setPrevSize();
readyCallbacks.add(function() {
if (!removeListener && callbacks.has()) {
removeListener = domAdapter.listen(windowUtils.getWindow(), "resize", handleResize)
}
});
return result
};
callbacks.remove = function() {
var result = originalCallbacksRemove.apply(callbacks, arguments);
if (!callbacks.has() && removeListener) {
removeListener();
removeListener = void 0
}
return result
};
return callbacks
}();
module.exports = resizeCallbacks;