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<script lang="ts">
import {random_string} from "$shared/lib/helpers";
export const id = "__menu_" + random_string(3);
export let trigger: HTMLElement;
export let show = false;
let windowInnerWidth = 0;
let windowInnerHeight = 0;
let menu: HTMLMenuElement;
$: if (show && menu && trigger) {
const
selectedTriggerPosition = trigger.getBoundingClientRect(),
menuOnTop = (windowInnerHeight - selectedTriggerPosition.bottom) < selectedTriggerPosition.top,
left = selectedTriggerPosition.left,
right = (windowInnerWidth - selectedTriggerPosition.right),
isRight = (windowInnerWidth < selectedTriggerPosition.left + menu.offsetWidth),
vertical = menuOnTop
? "bottom: " + (windowInnerHeight - selectedTriggerPosition.top) + "px;"
: "top: " + selectedTriggerPosition.bottom + "px;";
let horizontal = isRight ? "right: " + right + "px;" : "left: " + left + "px;";
// check right position is correct -> otherwise set left to 0
if (isRight && (right + menu.offsetWidth) > windowInnerWidth) horizontal = ("left: " + (windowInnerWidth - menu.offsetWidth) / 2 + "px;");
const maxHeight = menuOnTop ? selectedTriggerPosition.top - 20 : windowInnerHeight - selectedTriggerPosition.bottom - 20;
menu.setAttribute("style", horizontal + vertical + "max-height:" + Math.floor(maxHeight) + "px;");
}
function on_window_click(event) {
if (!event.target.closest("#" + id) && !event.target.closest("[aria-controls='" + id + "']")) show = false;
}
function on_window_touchend(event) {
if (!event.target.closest("#" + id) && !event.target.closest("[aria-controls='" + id + "']")) show = false;
}
</script>
<svelte:window
on:click={on_window_click}
on:touchend={on_window_touchend}
bind:innerWidth={windowInnerWidth}
bind:innerHeight={windowInnerHeight}
/>
<menu class="menu"
id="{id}"
bind:this={menu}
class:menu--is-visible={show}
aria-expanded="{show}"
aria-haspopup="true">
<slot name="options"/>
</menu>
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