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"use client";
import { useCallback, useEffect, useRef } from "react";
import { usePreviewViewport } from "@/components/editor/panels/preview/preview-viewport";
import { useEditor } from "@/hooks/use-editor";
import type { TextElement } from "@/lib/timeline";
import {
FONT_SIZE_SCALE_REFERENCE,
} from "@/constants/text-constants";
import { DEFAULTS } from "@/lib/timeline/defaults";
import {
getMetricAscent,
getMetricDescent,
setCanvasLetterSpacing,
} from "@/lib/text/layout";
let cachedCanvas: HTMLCanvasElement | null = null;
function getMeasurementContext(): CanvasRenderingContext2D | null {
if (!cachedCanvas) cachedCanvas = document.createElement("canvas");
return cachedCanvas.getContext("2d");
}
/**
* Uses fontBoundingBox metrics (which CSS uses for line box layout) rather than
* actualBoundingBox to model where the browser places the baseline within the
* line box, then measures actual glyph bounds to find the visual center.
*/
function measureCSSVisualCenterOffset({
lines,
fontString,
letterSpacingPx,
lineHeightPx,
displayFontSize,
}: {
lines: string[];
fontString: string;
letterSpacingPx: number;
lineHeightPx: number;
displayFontSize: number;
}): number {
const ctx = getMeasurementContext();
if (!ctx) return 0;
ctx.font = fontString;
ctx.textBaseline = "alphabetic";
setCanvasLetterSpacing({ ctx, letterSpacingPx });
const probe = ctx.measureText("M");
const fontAscent = probe.fontBoundingBoxAscent ?? displayFontSize * 0.8;
const fontDescent = probe.fontBoundingBoxDescent ?? displayFontSize * 0.2;
const halfLeading = (lineHeightPx - fontAscent - fontDescent) / 2;
let visualTop = Number.POSITIVE_INFINITY;
let visualBottom = Number.NEGATIVE_INFINITY;
for (let i = 0; i < lines.length; i++) {
const metrics = ctx.measureText(lines[i] || " ");
const baseline = i * lineHeightPx + halfLeading + fontAscent;
visualTop = Math.min(
visualTop,
baseline - getMetricAscent({ metrics, fallbackFontSize: displayFontSize }),
);
visualBottom = Math.max(
visualBottom,
baseline + getMetricDescent({ metrics, fallbackFontSize: displayFontSize }),
);
}
const cssBlockHeight = lines.length * lineHeightPx;
return (visualTop + visualBottom) / 2 - cssBlockHeight / 2;
}
export function TextEditOverlay({
trackId,
elementId,
element,
onCommit,
}: {
trackId: string;
elementId: string;
element: TextElement;
onCommit: () => void;
}) {
const editor = useEditor();
const viewport = usePreviewViewport();
const divRef = useRef<HTMLDivElement>(null);
useEffect(() => {
const div = divRef.current;
if (!div) return;
div.focus();
const range = document.createRange();
range.selectNodeContents(div);
const selection = window.getSelection();
selection?.removeAllRanges();
selection?.addRange(range);
}, []);
const handleInput = useCallback(() => {
const div = divRef.current;
if (!div) return;
const text = div.innerText;
editor.timeline.previewElements({
updates: [{ trackId, elementId, updates: { content: text } }],
});
}, [editor.timeline, trackId, elementId]);
const handleKeyDown = useCallback(
({ event }: { event: React.KeyboardEvent }) => {
const { key } = event;
if (key === "Escape") {
event.preventDefault();
onCommit();
return;
}
},
[onCommit],
);
const canvasSize = editor.project.getActive().settings.canvasSize;
if (!canvasSize) return null;
const { x: posX, y: posY } = viewport.positionToOverlay({
positionX: element.transform.position.x,
positionY: element.transform.position.y,
});
const { x: displayScaleX } = viewport.getDisplayScale();
const displayFontSize =
element.fontSize *
(canvasSize.height / FONT_SIZE_SCALE_REFERENCE) *
displayScaleX;
const lineHeight = element.lineHeight ?? DEFAULTS.text.lineHeight;
const fontWeight = element.fontWeight === "bold" ? "bold" : "normal";
const fontStyle = element.fontStyle === "italic" ? "italic" : "normal";
const displayLetterSpacing = (element.letterSpacing ?? 0) * displayScaleX;
const lineHeightPx = displayFontSize * lineHeight;
const lines = (element.content || "").split("\n");
const fontString = `${fontStyle} ${fontWeight} ${displayFontSize}px "${element.fontFamily}", sans-serif`;
const cssVisualCenterOffset = measureCSSVisualCenterOffset({
lines,
fontString,
letterSpacingPx: displayLetterSpacing,
lineHeightPx,
displayFontSize,
});
const bg = element.background;
const shouldShowBackground =
bg.enabled && bg.color && bg.color !== "transparent";
const fontSizeRatio = element.fontSize / DEFAULTS.text.element.fontSize;
const displayPaddingX = shouldShowBackground
? (bg.paddingX ?? DEFAULTS.text.background.paddingX) *
fontSizeRatio *
displayScaleX
: 0;
const displayPaddingY = shouldShowBackground
? (bg.paddingY ?? DEFAULTS.text.background.paddingY) *
fontSizeRatio *
displayScaleX
: 0;
return (
<div
className="absolute"
style={{
left: posX,
top: posY - cssVisualCenterOffset,
transform: `translate(-50%, -50%) scale(${element.transform.scaleX}, ${element.transform.scaleY}) rotate(${element.transform.rotate}deg)`,
transformOrigin: "center center",
}}
>
{/* biome-ignore lint/a11y/useSemanticElements: contenteditable required for multiline, IME, paste */}
<div
ref={divRef}
contentEditable
suppressContentEditableWarning
tabIndex={0}
role="textbox"
aria-label="Edit text"
className="cursor-text select-text outline-none whitespace-pre"
style={{
fontSize: displayFontSize,
fontFamily: element.fontFamily,
fontWeight,
fontStyle,
textAlign: element.textAlign,
letterSpacing: `${displayLetterSpacing}px`,
lineHeight,
color: element.color,
backgroundColor: shouldShowBackground ? bg.color : "transparent",
minHeight: lineHeightPx,
textDecoration: element.textDecoration ?? "none",
padding: shouldShowBackground
? `${displayPaddingY}px ${displayPaddingX}px`
: 0,
minWidth: 1,
}}
onInput={handleInput}
onBlur={onCommit}
onKeyDown={(event) => handleKeyDown({ event })}
>
{element.content || ""}
</div>
</div>
);
}
|
