Adding Light and Dark Themes to Vaadin Tooltip: A Step-by-Step Guide

Using the Vaadin tooltip component in my HTML has been quite helpful. Here's an example of how I've implemented it:

      <h1 id="heading-2">
        salam
        <vaadin-tooltip
          theme="dark"
          for="heading-2"
          position="bottom-center"
          text="Tooltip with position bottom-center"
        ></vaadin-tooltip>
      </h1>

      <h1 id="heading-3">
        salam
        <vaadin-tooltip
          theme="light"
          for="heading-3"
          position="bottom-end"
          text="Tooltip with position bottom-end"
        ></vaadin-tooltip>
      </h1>

I have a requirement to dynamically change the background color of the tooltip based on the chosen theme.

The tooltip.ts file currently contains the following code snippet:

import { registerStyles } from "@vaadin/vaadin-themable-mixin";
import { css } from "lit";

registerStyles(
  "vaadin-tooltip",
  css`
    :host[theme="dark"] {
      font-family: var(--lumo-font-family);
      // background-color: yellow;
    }
  `
);

registerStyles(
  "vaadin-tooltip-overlay",
  css`
    :host {
      font-family: var(--lumo-font-family);
      // background-color: yellow;
    }

    :host::part(overlay) {
      // background-color: red;
    }
  `
);

I am facing challenges in assigning styles to the overlay based on the class assigned to the tooltip. Additionally, I'm unsure about how to include a class in the overlay element.

I am willing to explore options for statically defining styles within the HTML as well.

Answer №1

When it comes to Tooltip, a unique method is utilized to pass on class names to its overlay by utilizing the overlay-class attribute:

<vaadin-tooltip overlay-class="custom-tooltip" ...></vaadin-tooltip>

To ensure the corresponding CSS rule functions correctly, it should be included in the global CSS (instead of relying on registerStyles as shown in your example):

vaadin-tooltip-overlay.custom-tooltip::part(overlay) {
  background: green;
}

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