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Add click-to-copy for fenced code blocks #4

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47 changes: 47 additions & 0 deletions src/viewer.css
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Original file line number Diff line number Diff line change
Expand Up @@ -196,13 +196,49 @@ body {
}

.document pre {
position: relative;
overflow-x: auto;
padding: 20px 22px;
border-radius: 14px;
background: var(--code-block-bg);
color: var(--code-block-text);
}

.document pre.code-block--copyable {
cursor: copy;
outline: 1px solid transparent;
outline-offset: 2px;
transition: outline-color 0.15s;
}

.document pre.code-block--copyable:hover,
.document pre.code-block--copyable:focus-visible {
outline-color: var(--accent);
}

.document pre.code-block--copyable::after {
content: attr(data-copy-label);
position: absolute;
top: 8px;
right: 10px;
padding: 5px 7px;
border: 1px solid rgba(216, 226, 240, 0.22);
border-radius: 6px;
background: rgba(0, 0, 0, 0.36);
color: var(--code-block-text);
font: 500 11px/1 "SF Pro Text", "Segoe UI", sans-serif;
opacity: 0;
pointer-events: none;
transition: opacity 0.15s;
}

.document pre.code-block--copyable:hover::after,
.document pre.code-block--copyable:focus-visible::after,
.document pre.code-block--copyable[data-copy-state="copied"]::after,
.document pre.code-block--copyable[data-copy-state="failed"]::after {
opacity: 0.88;
}

.document pre code {
padding: 0;
background: transparent;
Expand Down Expand Up @@ -260,6 +296,12 @@ body {
transform: translateY(1px);
}

.clipboard-fallback-input {
position: fixed;
top: -9999px;
left: -9999px;
}

.theme-toggle {
position: fixed;
top: 14px;
Expand Down Expand Up @@ -394,4 +436,9 @@ body:hover .theme-toggle {
.find-panel {
display: none;
}

/* separating for a clean merge */
.document pre.code-block--copyable::after {
display: none;
}
}
100 changes: 100 additions & 0 deletions src/viewer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,7 @@

function applyRenderedContent() {
contentEl.innerHTML = renderedContentHtml || "<p></p>";
setupCodeBlockCopy(contentEl);
disableTaskCheckboxes(contentEl);
finalizeLinks(contentEl);
finalizeImages(contentEl);
Expand Down Expand Up @@ -407,6 +408,105 @@
}
}

async function copyTextToClipboard(text) {
if (navigator.clipboard && navigator.clipboard.writeText) {
try {
await navigator.clipboard.writeText(text);
return;
} catch (error) {
console.warn(error);
}
}

const textarea = document.createElement("textarea");
textarea.value = text;
textarea.className = "clipboard-fallback-input";
textarea.setAttribute("readonly", "");
document.body.appendChild(textarea);
textarea.focus();
textarea.select();

try {
if (!document.execCommand("copy")) {
throw new Error("Copy command was rejected.");
}
} finally {
textarea.remove();
}
}

function hasSelectionInside(element) {
const selection = window.getSelection();
if (!selection || selection.isCollapsed) {
return false;
}

return element.contains(selection.anchorNode) || element.contains(selection.focusNode);
}

function setCodeBlockCopyState(pre, state) {
pre.dataset.copyState = state;
if (state === "copied") {
pre.dataset.copyLabel = "Copied";
} else if (state === "failed") {
pre.dataset.copyLabel = "Copy failed";
} else {
pre.dataset.copyLabel = "Click to copy";
}
}

function flashCodeBlockCopyState(pre, state) {
setCodeBlockCopyState(pre, state);
window.clearTimeout(Number(pre.dataset.copyTimer || 0));
const timer = window.setTimeout(() => {
setCodeBlockCopyState(pre, "ready");
delete pre.dataset.copyTimer;
}, 1400);
pre.dataset.copyTimer = String(timer);
}

async function copyCodeBlock(pre, code) {
try {
await copyTextToClipboard(code.textContent || "");
flashCodeBlockCopyState(pre, "copied");
} catch (error) {
console.error(error);
flashCodeBlockCopyState(pre, "failed");
}
}

function setupCodeBlockCopy(root) {
const codeBlocks = root.querySelectorAll("pre > code");

for (const code of codeBlocks) {
const pre = code.parentElement;
if (!pre) continue;

pre.classList.add("code-block--copyable");
pre.setAttribute("role", "button");
pre.setAttribute("tabindex", "0");
pre.setAttribute("aria-label", "Copy code block");
setCodeBlockCopyState(pre, "ready");

pre.addEventListener("click", () => {
if (hasSelectionInside(pre)) {
return;
}

copyCodeBlock(pre, code);
});

pre.addEventListener("keydown", (event) => {
if (event.key !== "Enter" && event.key !== " ") {
return;
}

event.preventDefault();
copyCodeBlock(pre, code);
});
}
}

initTheme();

if (!payloadEl) {
Expand Down