c2n/web-componentsv1.0.18
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OverviewGetting startedComponentsIconsGuidesExamples
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Masonry

Automatically pack differently sized dashboard tiles, then move or resize them in edit mode.

c2-masonry

Automatically packs direct c2-masonry-item children into the first available grid cells. Use c2-dashboard when the application must choose fixed coordinates instead.

Attributes

NameTypeDefaultDescription
editablebooleanfalseShows separate move and resize controls when every tile has a unique identity.
save-layoutbooleantrueSaves committed user layouts to localStorage and restores them on load. Use save-layout="false" to opt out.
storage-keystring | undefined—Optional stable localStorage key; otherwise the page URL and element ID or position identify this container.

Slots

NameDescription
defaultDirect c2-masonry-item children to pack.

Events

NameTypeDescription
layout-errorCustomEvent<MasonryLayoutErrorDetail>Invalid tile identities, spans, or supplied snapshot; does not bubble.
layout-changeCustomEvent<MasonryLayoutChangeDetail>Fired exactly once after a real user move or resize commit; does not bubble. Detail includes a complete restorable snapshot.

CSS parts

Shadow DOM styling hooks used with ::part(name). Prefer CSS custom properties when they cover the change.

NameDescription
gridPacked grid region.
placeholderCandidate occupied area during an edit session.

CSS custom properties

Grouped by semantic target and state from --c2-<component>__<target>__<state>--<property>. Click a group to collapse it; click a name to copy it.

NameTypeDefaultDescription
c2-masonry
--c2-masonry--gappixel8pxGap between cells and tiles.
--c2-masonry--row-heightpixel8pxHeight of one grid row.
--c2-masonry--paddingpadding0pxInset around the grid.
--c2-masonry--backgroundcolortransparentGrid background.
--c2-masonry--borderbordernoneOuter border.
--c2-masonry--border-radiusborder-radius0pxOuter corner radius.
c2-masonry > placeholder
--c2-masonry__placeholder--backgroundcolorrgb(37 99 235 / 8%)Candidate tile fill.
--c2-masonry__placeholder--borderborder2px dashed #2563ebCandidate tile edge.
--c2-masonry__placeholder--border-radiusborder-radius6pxCandidate corners.
c2-masonry > motion
--c2-masonry__motion--durationtime160msDecorative movement duration.
--c2-masonry__motion--timing-functiontiming-functioneaseDecorative movement easing.

Text and languages

The text the component shows, in English. It shows another language when the app adds one with addTranslations, under masonry, and the nearest lang asks for it; any message not translated stays in English. {0}, {1}… stand for the values a message carries. Languages guide.

KeyEnglishValues
tileTile—
moveMove {0}{0} label
resizeResize {0}{0} label
content{0} content{0} label
instructionsPress Enter or Space, use arrow keys, then press Enter to save or Escape to cancel.—
started{0} {1} started. Use arrow keys; Enter saves and Escape cancels.{0} label
{1} kind
position{0}: position {1} of {2}.{0} label
{1} position
{2} count
size{0}: {1} columns, {2} rows. Smallest size reached.{0} label
{1} columns
{2} rows
{3} atMinimum
noChangeNo layout change.—
saved{0} {1} saved.{0} label
{1} kind
canceled{0} edit canceled.{0} label

c2-masonry-item

A fixed-span content tile placed by its parent c2-masonry. Tall content scrolls within the tile.

Attributes

NameTypeDefaultDescription
item-idstring | undefined—Stable identity used for editing and application snapshots.
labelstring | undefined—Human-readable name used for the scroll region and edit controls.
rowsnumber10Positive integer row span shared across size ranges.
colsnumber3Positive integer base column span.
cols-xsnumber | undefined—Optional positive column span for containers narrower than 600 px.
cols-smnumber | undefined—Optional positive column span for 600–959.99 px containers.
cols-mdnumber | undefined—Optional positive column span for 960–1279.99 px containers.
cols-lgnumber | undefined—Optional positive column span for containers at least 1280 px wide.
min-rowsnumber1Smallest row span a user resize, by pointer or keyboard, can reach: a positive integer, otherwise 1. It only stops the tile shrinking while it is resized. An authored rows or a restored layout below it is left as it is, and such a tile cannot be resized smaller than it already is.
min-colsnumber1Smallest column span a user resize, by pointer or keyboard, can reach in any size range: a positive integer, otherwise 1. It is capped at the range's column count (xs 1, sm 6, md 9, lg 12), so on xs it is always 1. Like min-rows, it never rewrites an authored or restored span below it.
move-handlestring | undefined—Id of an element inside the tile that moves it, in place of the built-in move handle, which is then not drawn: a button in the tile's own header, for example. Pressing it, or Enter or Space on it, starts a move exactly as on the built-in handle. The element is the application's: label it ("Move Groceries"), show it only while the container is editable if it should not show otherwise, and give it touch-action: none so a touch drag moves the tile instead of scrolling the page. The resize edges stay as they are.
pinnedbooleanfalseKeeps the tile in the group at the start of the container: pinned tiles always come before the others, in their own order. A move keeps a pinned tile among the pinned ones and any other tile after them, and a pinned tile authored or restored after an unpinned one is placed before it. Pin a tile the application keeps in view, such as a pinned note; nothing about the look changes, so show the pin in the tile itself.

Slots

NameDescription
defaultApplication-owned tile content.
move-iconOptional move-handle icon; an inline grip is provided by default.
actionsButtons for the tile, such as a menu, in its top-right corner after the move handle. They show with the move handle, while the tile is hovered or has focus (see --c2-masonry-item__actions--opacity), and work whether or not the container is editable. Put them on the item itself, beside its content, so a tile whose content is one link can still carry a menu.

Events

NameTypeDescription
c2-masonry-item-pinnedEventInternal: pinned changed after the tile was placed, so the parent c2-masonry lays the tiles out again. Bubbles.

CSS parts

Shadow DOM styling hooks used with ::part(name). Prefer CSS custom properties when they cover the change.

NameDescription
contentKeyboard-reachable scrolling region containing the application content.
controlsGroup of edit-only move and resize controls.
actionsTop-right corner holding the move handle and the actions slot.
move-handleButton that starts a move operation.
resize-handleKeyboard-reachable bottom edge that starts a resize operation.
resize-edgePointer resize target on the right edge.
resize-cornerPointer resize target on the bottom-right corner; drags change columns and rows together.

CSS custom properties

Grouped by semantic target and state from --c2-<component>__<target>__<state>--<property>. Click a group to collapse it; click a name to copy it.

NameTypeDefaultDescription
c2-masonry-item
--c2-masonry-item--backgroundcolortransparentTile surface.
--c2-masonry-item--borderbordernoneTile border.
--c2-masonry-item--border-radiusborder-radius0pxTile corner radius.
--c2-masonry-item--box-shadowbox-shadownoneTile elevation.
c2-masonry-item > content
--c2-masonry-item__content--paddingpadding0pxContent inset.
c2-masonry-item > controls
--c2-masonry-item__controls--gappixel4pxMove-handle inset from the top and right borders.
--c2-masonry-item__controls--backgroundcolortransparentSurface behind the move-handle corner.
c2-masonry-item > handle
--c2-masonry-item__handle--sizepixel32pxMove-handle hit target size.
--c2-masonry-item__handle--icon-sizepixel16pxBuilt-in move icon size.
--c2-masonry-item__handle--colorcolor#18181bMove-handle foreground.
--c2-masonry-item__handle--backgroundcolortransparentMove-handle surface.
--c2-masonry-item__handle--border-radiusborder-radius6pxEdit-control corners.
c2-masonry-item > handle > hover
--c2-masonry-item__handle__hover--backgroundcolortransparentHovered move-handle surface.
c2-masonry-item > handle > focus
--c2-masonry-item__handle__focus--outlineoutline2px solid #2563ebKeyboard focus indicator.
c2-masonry-item > actions
--c2-masonry-item__actions--gappixel4pxSpace between the move handle and the slotted actions.
--c2-masonry-item__actions--opacityopacity0Opacity of the actions while the tile is neither hovered nor focused; 1 keeps them always visible.
c2-masonry-item > resize-handle
--c2-masonry-item__resize-handle--sizepixel8pxInvisible resize-edge hit-zone depth.
c2-masonry-item > resize-edge
c2-masonry-item > resize-edge > hover
--c2-masonry-item__resize-edge__hover--colorcolorrgb(37 99 235 / 35%)Right and bottom border color while the tile is hovered or focused.
c2-masonry-item > dragging
--c2-masonry-item__dragging--opacityopacity0.92Active tile opacity.
--c2-masonry-item__dragging--box-shadowbox-shadow0 12px 28px rgb(15 23 42 / 24%)Active tile elevation.
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month, or a year: billing periods, reports and card expiry.InputsMonth PlannerMonth calendar that draws events and trips as bars across the days they cover.PlanningNavigation MenuSite navigation bar whose triggers open panels of links below the header.NavigationNotepadA rich-text notepad that looks like paper: handwriting on ruled lines, a formatting toolbar over the selection, checklists and tear-off pages.PlanningNotification CenterAn inbox panel of notifications grouped by day, with read and unread states and mark all as read.FeedbackNumber InputForm-associated numeric input with native validation, step controls, adornments and helper states.InputsOrg ChartA hierarchy drawn as connected cards that collapse and expand: an organization chart, a reporting line or a team structure.Data displayOTP InputForm-associated one-time-code field with one cell per character, paste and SMS autofill, grouping and masking.InputsOverflow ListOne row of actions or links that shows what fits and folds 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as one JSON object, picked by the nearest lang.GuideFrameworksUse the components from React, Vue, Angular, Svelte, Lit or plain HTML — typed events, generated template types, and the one piece of configuration each framework needs.GuideUsing c2n in an applicationThe workflow behind every c2n app: load the theme once, use c2-* tags directly, and turn every repeated pattern into a small variant or composed component.GuideAI toolsGive Claude Code, Codex, Google Antigravity or GitHub Copilot the c2n skill, live component APIs, examples and application conventions.GuideNo components match.
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