/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at
http://mozilla.org/MPL/2.0/. */
/*
* This creates a button that can be used to copy text to the clipboard.
* Whenever the button is pressed the getCopyContentsFn passed into the
* constructor is called and the resulting text is copied. It uses CSS
* transitions to perform a short animation.
*/
class CopyButton {
constructor(getCopyContentsFn) {
const button = document.createElement("span");
button.textContent = String.fromCodePoint(0x1f4cb);
button.classList.add("copy-button", "copy-button-base");
button.onclick = () => {
if (!button.classList.contains("copy-button")) {
return;
}
const handleAnimation = async () => {
const switchFadeDirection = () => {
if (button.classList.contains("copy-button-fade-out")) {
// We just faded out so let's fade in
button.classList.toggle("copy-button-fade-out");
button.classList.toggle("copy-button-fade-in");
} else {
// We just faded in so let's fade out
button.classList.toggle("copy-button-fade-out");
button.classList.toggle("copy-button-fade-in");
}
};
// Fade out clipboard icon
// Fade out the clipboard character
button.classList.toggle("copy-button-fade-out");
// Wait for CSS transition to end
await new Promise(r => (button.ontransitionend = r));
// Fade in checkmark icon
// This is the start of fade in.
// Switch to the checkmark character
button.textContent = String.fromCodePoint(0x2705);
// Trigger CSS fade in transition
switchFadeDirection();
// Wait for CSS transition to end
await new Promise(r => (button.ontransitionend = r));
// Fade out clipboard icon
// Trigger CSS fade out transition
switchFadeDirection();
// Wait for CSS transition to end
await new Promise(r => (button.ontransitionend = r));
// Fade in clipboard icon
// This is the start of fade in.
// Switch to the clipboard character
button.textContent = String.fromCodePoint(0x1f4cb);
// Trigger CSS fade in transition
switchFadeDirection();
// Wait for CSS transition to end
await new Promise(r => (button.ontransitionend = r));
// Remove fade
button.classList.toggle("copy-button-fade-in");
// Re-enable clicks and hidding when parent div has lost :hover
button.classList.add("copy-button");
};
// Note the fade effect is handled in the CSS, we just need to swap
// between the different CSS classes. This returns a promise that waits
// for the current fade to end, starts the next fade, then resolves.
navigator.clipboard.writeText(getCopyContentsFn());
// Prevent animation from disappearing when parent div losses :hover,
// and prevent additional clicks until the animation finishes.
button.classList.remove("copy-button");
handleAnimation(); // runs unawaited
};
this.element = button;
}
}
export { CopyButton };
