69 lines
2.0 KiB
Svelte
69 lines
2.0 KiB
Svelte
<!--
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Copyright: Ankitects Pty Ltd and contributors
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License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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-->
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<script lang="ts">
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import { onMount, createEventDispatcher } from "svelte";
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export let container: HTMLElement;
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export let image: HTMLImageElement;
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export let offsetX = 0;
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export let offsetY = 0;
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let left: number;
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let top: number;
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let width: number;
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let height: number;
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function setSelection(_selection?: HTMLDivElement): void {
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const containerRect = container.getBoundingClientRect();
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const imageRect = image!.getBoundingClientRect();
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const containerLeft = containerRect.left;
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const containerTop = containerRect.top;
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left = imageRect!.left - containerLeft;
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top = imageRect!.top - containerTop;
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width = image!.clientWidth;
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height = image!.clientHeight;
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}
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export function updateSelection(): Promise<void> {
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let updateResolve: () => void;
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const afterUpdate: Promise<void> = new Promise((resolve) => {
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updateResolve = resolve;
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});
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setSelection();
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setTimeout(() => updateResolve());
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return afterUpdate;
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}
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const dispatch = createEventDispatcher();
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let selection: HTMLDivElement;
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onMount(() => dispatch("mount", { selection }));
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</script>
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<div
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bind:this={selection}
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use:setSelection
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on:click={(event) =>
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/* prevent triggering Bootstrap dropdown */ event.stopImmediatePropagation()}
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style="--left: {left}px; --top: {top}px; --width: {width}px; --height: {height}px; --offsetX: {offsetX}px; --offsetY: {offsetY}px;"
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>
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<slot />
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</div>
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<style lang="scss">
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div {
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position: absolute;
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left: calc(var(--left, 0px) - var(--offsetX, 0px));
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top: calc(var(--top, 0px) - var(--offsetY, 0px));
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width: calc(var(--width) + 2 * var(--offsetX, 0px));
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height: calc(var(--height) + 2 * var(--offsetY, 0px));
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}
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</style>
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