Markdown Formatting Command Menu Block for React

So you can see it without a click. On load the menu is the Command and its sample band drawn inline under a picture of the note, in a plain shell that is not modal, so nothing is trapped, hidden or focused and the page around the preview keeps working. The header's field opens the real command dialog, modal, with its focus trap, Escape and focus return, and the inline copy stays closed until a reload. Both show the same Palette and share the block's state, so the text you edited in the copy is the text the dialog opens with. In your app keep the dialog and drop the copy: the "in-place" state, the scrim with its shell and the Escape and blur effects.

It asks the Textarea. The browser keeps a textarea's selection after focus leaves it, so choosing a row in the list still sees the words you selected; the block reads selectionStart and selectionEnd when the row is chosen and passes them, with the text, to a pure function that returns the new text and where the selection goes. After the action the selection is put on what changed without moving focus, so Bold can be pressed again to unwrap, and the text you typed around the selection is never touched.

Heading cycles the line through ##, ### and plain. Bold wraps the selection in **, unwraps it if it is already wrapped (inside or just around the selection), and with nothing selected puts a **bold** placeholder in with the word selected. Link wraps the selection as [text](https://example.com) and leaves the address selected for you to type over. Bullet list starts each line the selection touches with - or takes the bullets off if every line has one. Table, Divider and Meeting-note put a block in under the line after a blank line and select it, so it is easy to see where it landed.

From typed pieces, never from HTML: the text is cut into headings, list items, rules, tables and paragraphs, and each line into plain, bold and link pieces that are drawn as elements. A link is drawn underlined and opens nothing. Because nothing is parsed into markup there is nothing to inject, which is also why it handles only the small subset the menu writes; in your app use the renderer your editor already has.

All of it. The sample and the preview are state in the block, nothing is saved or sent, and nothing touches the clipboard. In your app give the band's Textarea your document's text or the editor's selection, and have each editFor result go through your editor's own transaction so undo and collaboration keep working.

Yes. Type to search the actions, the arrow keys move through them, Enter applies, and Escape closes the menu and puts focus on the field; Tab reaches the sample. Ctrl or ⌘ K opens the dialog while focus is inside the block, and only then. The rows are options of a cmdk listbox; the block turns off its own fuzzy filter and lists the rows itself. The icons are hidden from assistive technology; each row is read as its name and what it does, and each action is announced on the status line.