tp-tooltip/tp-tooltip-mixin.js

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2022-03-12 17:01:05 +01:00
/**
@license
Copyright (c) 2022 trading_peter
This program is available under Apache License Version 2.0
*/
import './tp-tooltip.js';
/**
* Elements implementing this mixin are able to show tooltip on mouse over.
*
* ## Example
* ```html
* <x-foo tooltip="Show this text in the tooltip"></x-foo>
* ```
*
* @polymer
* @mixinFunction
*/
export const Tooltip = function(superClass) {
return class extends superClass {
static get properties() {
return {
/**
* Text to show in the tooltip.
*/
tooltip: { type: String },
/**
* Vertical align of the tooltip.
* Supported are `bottom` and `top`.
*/
tooltipValign: { type: String }
};
}
constructor() {
super();
this.tooltipValign = 'bottom';
this._showTooltip = this._showTooltip.bind(this);
this._hideTooltip = this._hideTooltip.bind(this);
}
set tooltip(val) {
const oldTooltip = this.tooltip;
this._tooltip = val;
this._tooltipChanged(this.tooltip, oldTooltip);
}
get tooltip() {
return this._tooltip;
}
_tooltipChanged(newTooltip, oldTooltip) {
if (oldTooltip) {
this.removeEventListener('mouseenter', this._showTooltip);
this.removeEventListener('focus', this._showTooltip);
}
if (newTooltip && newTooltip !== '') {
this.addEventListener('mouseenter', this._showTooltip);
this.addEventListener('focus', this._showTooltip);
}
}
_showTooltip() {
if (this._tooltipInstance || !this.tooltip || this.tooltip === '') {
return;
}
const tooltip = document.createElement('tp-tooltip');
tooltip.innerHTML = this.tooltip;
tooltip.valign = this.tooltipValign;
tooltip.target = this;
this._tooltipInstance = tooltip;
this.addEventListener('mouseleave', this._hideTooltip);
this.addEventListener('blur', this._hideTooltip);
this.addEventListener('click', this._hideTooltip);
document.body.appendChild(this._tooltipInstance);
this._tooltipInstance.show();
}
_hideTooltip() {
if (!this._tooltipInstance) {
return;
}
this._tooltipInstance.hide(function() {
if (this._tooltipInstance) {
document.body.removeChild(this._tooltipInstance);
this.removeEventListener('mouseleave', this._hideTooltip);
this.removeEventListener('blur', this._hideTooltip);
this.removeEventListener('click', this._hideTooltip);
this._tooltipInstance = null;
}
}.bind(this));
}
};
}