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https://github.com/element-hq/element-web.git
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9ecb23ce71
- move some methods to ResizeItem subclass - allow distributor to instanciate sizer and resizeitem it needs through static factory methods, instead of passing in another ctor a distributor can only function with the right item and sizer anyways. - use consistent import/export style - remove obsolete code
88 lines
2.7 KiB
JavaScript
88 lines
2.7 KiB
JavaScript
/*
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Copyright 2018 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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implements DOM/CSS operations for resizing.
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The sizer determines what CSS mechanism is used for sizing items, like flexbox, ...
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*/
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export default class Sizer {
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constructor(container, vertical, reverse) {
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this.container = container;
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this.reverse = reverse;
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this.vertical = vertical;
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}
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/**
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@param {Element} item the dom element being resized
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@return {number} how far the edge of the item is from the edge of the container
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*/
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getItemOffset(item) {
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const offset = (this.vertical ? item.offsetTop : item.offsetLeft) - this._getOffset();
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if (this.reverse) {
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return this.getTotalSize() - (offset + this.getItemSize(item));
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} else {
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return offset;
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}
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}
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/**
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@param {Element} item the dom element being resized
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@return {number} the width/height of an item in the container
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*/
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getItemSize(item) {
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return this.vertical ? item.offsetHeight : item.offsetWidth;
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}
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/** @return {number} the width/height of the container */
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getTotalSize() {
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return this.vertical ? this.container.offsetHeight : this.container.offsetWidth;
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}
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/** @return {number} container offset to offsetParent */
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_getOffset() {
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return this.vertical ? this.container.offsetTop : this.container.offsetLeft;
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}
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setItemSize(item, size) {
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if (this.vertical) {
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item.style.height = `${Math.round(size)}px`;
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} else {
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item.style.width = `${Math.round(size)}px`;
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}
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}
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clearItemSize(item) {
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if (this.vertical) {
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item.style.height = null;
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} else {
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item.style.width = null;
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}
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}
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/**
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@param {MouseEvent} event the mouse event
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@return {number} the distance between the cursor and the edge of the container,
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along the applicable axis (vertical or horizontal)
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*/
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offsetFromEvent(event) {
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const pos = this.vertical ? event.pageY : event.pageX;
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if (this.reverse) {
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return (this._getOffset() + this.getTotalSize()) - pos;
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} else {
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return pos - this._getOffset();
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}
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}
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}
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