101 lines
2.6 KiB
JavaScript
101 lines
2.6 KiB
JavaScript
/**
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@license
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Copyright (c) 2022 trading_peter
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This program is available under Apache License Version 2.0
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*/
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import './tp-tooltip.js';
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/**
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* Elements implementing this mixin are able to show tooltip on mouse over.
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*
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* ## Example
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* ```html
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* <x-foo tooltip="Show this text in the tooltip"></x-foo>
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* ```
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*
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* @polymer
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* @mixinFunction
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*/
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export const Tooltip = function(superClass) {
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return class extends superClass {
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static get properties() {
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return {
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/**
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* Text to show in the tooltip.
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*/
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tooltip: { type: String },
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/**
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* Vertical align of the tooltip.
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* Supported are `bottom` and `top`.
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*/
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tooltipValign: { type: String }
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};
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}
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constructor() {
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super();
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this.tooltipValign = 'bottom';
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this._showTooltip = this._showTooltip.bind(this);
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this._hideTooltip = this._hideTooltip.bind(this);
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}
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set tooltip(val) {
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const oldTooltip = this.tooltip;
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this._tooltip = val;
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this._tooltipChanged(this.tooltip, oldTooltip);
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}
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get tooltip() {
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return this._tooltip;
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}
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_tooltipChanged(newTooltip, oldTooltip) {
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if (oldTooltip) {
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this.removeEventListener('mouseenter', this._showTooltip);
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this.removeEventListener('focus', this._showTooltip);
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}
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if (newTooltip && newTooltip !== '') {
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this.addEventListener('mouseenter', this._showTooltip);
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this.addEventListener('focus', this._showTooltip);
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}
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}
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_showTooltip() {
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if (this._tooltipInstance || !this.tooltip || this.tooltip === '') {
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return;
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}
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const tooltip = document.createElement('tp-tooltip');
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tooltip.innerHTML = this.tooltip;
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tooltip.valign = this.tooltipValign;
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tooltip.target = this;
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this._tooltipInstance = tooltip;
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this.addEventListener('mouseleave', this._hideTooltip);
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this.addEventListener('blur', this._hideTooltip);
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this.addEventListener('click', this._hideTooltip);
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document.body.appendChild(this._tooltipInstance);
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this._tooltipInstance.show();
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}
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_hideTooltip() {
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if (!this._tooltipInstance) {
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return;
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}
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this._tooltipInstance.hide(function() {
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if (this._tooltipInstance) {
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document.body.removeChild(this._tooltipInstance);
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this.removeEventListener('mouseleave', this._hideTooltip);
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this.removeEventListener('blur', this._hideTooltip);
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this.removeEventListener('click', this._hideTooltip);
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this._tooltipInstance = null;
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}
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}.bind(this));
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}
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};
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}
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