basicswap/basicswap/static/js/ui/dropdown.js
2025-03-26 23:54:55 +01:00

210 lines
6.7 KiB
JavaScript

(function(window) {
'use strict';
const dropdownInstances = [];
function positionElement(targetEl, triggerEl, placement = 'bottom', offsetDistance = 8) {
targetEl.style.visibility = 'hidden';
targetEl.style.display = 'block';
const triggerRect = triggerEl.getBoundingClientRect();
const targetRect = targetEl.getBoundingClientRect();
const scrollLeft = window.pageXOffset || document.documentElement.scrollLeft;
const scrollTop = window.pageYOffset || document.documentElement.scrollTop;
let top, left;
top = triggerRect.bottom + offsetDistance;
left = triggerRect.left + (triggerRect.width - targetRect.width) / 2;
switch (placement) {
case 'bottom-start':
left = triggerRect.left;
break;
case 'bottom-end':
left = triggerRect.right - targetRect.width;
break;
}
const viewport = {
width: window.innerWidth,
height: window.innerHeight
};
if (left < 10) left = 10;
if (left + targetRect.width > viewport.width - 10) {
left = viewport.width - targetRect.width - 10;
}
targetEl.style.position = 'fixed';
targetEl.style.top = `${Math.round(top)}px`;
targetEl.style.left = `${Math.round(left)}px`;
targetEl.style.margin = '0';
targetEl.style.maxHeight = `${viewport.height - top - 10}px`;
targetEl.style.overflow = 'auto';
targetEl.style.visibility = 'visible';
}
class Dropdown {
constructor(targetEl, triggerEl, options = {}) {
this._targetEl = targetEl;
this._triggerEl = triggerEl;
this._options = {
placement: options.placement || 'bottom',
offset: options.offset || 5,
onShow: options.onShow || function() {},
onHide: options.onHide || function() {}
};
this._visible = false;
this._initialized = false;
this._handleScroll = this._handleScroll.bind(this);
this._handleResize = this._handleResize.bind(this);
this._handleOutsideClick = this._handleOutsideClick.bind(this);
dropdownInstances.push(this);
this.init();
}
init() {
if (!this._initialized) {
this._targetEl.style.margin = '0';
this._targetEl.style.display = 'none';
this._targetEl.style.position = 'fixed';
this._targetEl.style.zIndex = '40';
this._targetEl.classList.add('dropdown-menu');
this._setupEventListeners();
this._initialized = true;
}
}
_setupEventListeners() {
this._triggerEl.addEventListener('click', (e) => {
e.stopPropagation();
this.toggle();
});
document.addEventListener('click', this._handleOutsideClick);
document.addEventListener('keydown', (e) => {
if (e.key === 'Escape') this.hide();
});
window.addEventListener('scroll', this._handleScroll, true);
window.addEventListener('resize', this._handleResize);
}
_handleScroll() {
if (this._visible) {
requestAnimationFrame(() => {
positionElement(
this._targetEl,
this._triggerEl,
this._options.placement,
this._options.offset
);
});
}
}
_handleResize() {
if (this._visible) {
requestAnimationFrame(() => {
positionElement(
this._targetEl,
this._triggerEl,
this._options.placement,
this._options.offset
);
});
}
}
_handleOutsideClick(e) {
if (this._visible &&
!this._targetEl.contains(e.target) &&
!this._triggerEl.contains(e.target)) {
this.hide();
}
}
show() {
if (!this._visible) {
dropdownInstances.forEach(instance => {
if (instance !== this && instance._visible) {
instance.hide();
}
});
this._targetEl.style.display = 'block';
this._targetEl.style.visibility = 'hidden';
requestAnimationFrame(() => {
positionElement(
this._targetEl,
this._triggerEl,
this._options.placement,
this._options.offset
);
this._visible = true;
this._options.onShow();
});
}
}
hide() {
if (this._visible) {
this._targetEl.style.display = 'none';
this._visible = false;
this._options.onHide();
}
}
toggle() {
if (this._visible) {
this.hide();
} else {
this.show();
}
}
destroy() {
document.removeEventListener('click', this._handleOutsideClick);
window.removeEventListener('scroll', this._handleScroll, true);
window.removeEventListener('resize', this._handleResize);
const index = dropdownInstances.indexOf(this);
if (index > -1) {
dropdownInstances.splice(index, 1);
}
this._initialized = false;
}
}
function initDropdowns() {
document.querySelectorAll('[data-dropdown-toggle]').forEach(triggerEl => {
const targetId = triggerEl.getAttribute('data-dropdown-toggle');
const targetEl = document.getElementById(targetId);
if (targetEl) {
const placement = triggerEl.getAttribute('data-dropdown-placement');
new Dropdown(targetEl, triggerEl, {
placement: placement || 'bottom-start'
});
}
});
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', initDropdowns);
} else {
initDropdowns();
}
Dropdown.instances = dropdownInstances;
window.Dropdown = Dropdown;
window.initDropdowns = initDropdowns;
})(window);