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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
export function calcPopupPosition(el: HTMLElement, props: {
anchorElement?: HTMLElement | null;
innerMargin: number;
direction: 'top' | 'bottom' | 'left' | 'right';
align: 'top' | 'bottom' | 'left' | 'right' | 'center';
alignOffset?: number;
x?: number;
y?: number;
}): { top: number; left: number; transformOrigin: string; } {
const contentWidth = el.offsetWidth;
const contentHeight = el.offsetHeight;
const HORIZONTAL_MARGIN = 1;
let rect: DOMRect;
if (props.anchorElement) {
rect = props.anchorElement.getBoundingClientRect();
}
const calcPosWhenTop = () => {
let left: number;
let top: number;
if (props.anchorElement) {
left = rect.left + window.scrollX + (props.anchorElement.offsetWidth / 2);
top = (rect.top + window.scrollY - contentHeight) - props.innerMargin;
} else {
left = props.x;
top = (props.y - contentHeight) - props.innerMargin;
}
left -= (el.offsetWidth / 2);
if (left + contentWidth - window.scrollX > window.innerWidth) {
left = window.innerWidth - contentWidth + window.scrollX - HORIZONTAL_MARGIN;
}
left = Math.max(HORIZONTAL_MARGIN, left);
return [left, top];
};
const calcPosWhenBottom = () => {
let left: number;
let top: number;
if (props.anchorElement) {
left = rect.left + window.scrollX + (props.anchorElement.offsetWidth / 2);
top = (rect.top + window.scrollY + props.anchorElement.offsetHeight) + props.innerMargin;
} else {
left = props.x;
top = (props.y) + props.innerMargin;
}
left -= (el.offsetWidth / 2);
if (left + contentWidth - window.scrollX > window.innerWidth) {
left = window.innerWidth - contentWidth + window.scrollX - HORIZONTAL_MARGIN;
}
left = Math.max(HORIZONTAL_MARGIN, left);
return [left, top];
};
const calcPosWhenLeft = () => {
let left: number;
let top: number;
if (props.anchorElement) {
left = (rect.left + window.scrollX - contentWidth) - props.innerMargin;
top = rect.top + window.scrollY + (props.anchorElement.offsetHeight / 2);
} else {
left = (props.x - contentWidth) - props.innerMargin;
top = props.y;
}
left = Math.max(HORIZONTAL_MARGIN, left);
top -= (el.offsetHeight / 2);
if (top + contentHeight - window.scrollY > window.innerHeight) {
top = window.innerHeight - contentHeight + window.scrollY - 1;
}
return [left, top];
};
const calcPosWhenRight = () => {
let left: number;
let top: number;
if (props.anchorElement) {
left = (rect.left + props.anchorElement.offsetWidth + window.scrollX) + props.innerMargin;
if (props.align === 'top') {
top = rect.top + window.scrollY;
if (props.alignOffset != null) top += props.alignOffset;
} else if (props.align === 'bottom') {
// TODO
} else { // center
top = rect.top + window.scrollY + (props.anchorElement.offsetHeight / 2);
top -= (el.offsetHeight / 2);
}
} else {
left = props.x + props.innerMargin;
top = props.y;
top -= (el.offsetHeight / 2);
}
left = Math.max(HORIZONTAL_MARGIN, left);
if (top + contentHeight - window.scrollY > window.innerHeight) {
top = window.innerHeight - contentHeight + window.scrollY - 1;
}
return [left, top];
};
const calc = (): {
left: number;
top: number;
transformOrigin: string;
} => {
switch (props.direction) {
case 'top': {
const [left, top] = calcPosWhenTop();
// ツールチップを上に向かって表示するスペースがなければ下に向かって出す
if (top - window.scrollY < 0) {
const [left, top] = calcPosWhenBottom();
return { left, top, transformOrigin: 'center top' };
}
return { left, top, transformOrigin: 'center bottom' };
}
case 'bottom': {
const [left, top] = calcPosWhenBottom();
// TODO: ツールチップを下に向かって表示するスペースがなければ上に向かって出す
return { left, top, transformOrigin: 'center top' };
}
case 'left': {
const [left, top] = calcPosWhenLeft();
// ツールチップを左に向かって表示するスペースがなければ右に向かって出す
if (left - window.scrollX < 0) {
const [left, top] = calcPosWhenRight();
return { left, top, transformOrigin: 'left center' };
}
return { left, top, transformOrigin: 'right center' };
}
case 'right': {
const [left, top] = calcPosWhenRight();
// TODO: ツールチップを右に向かって表示するスペースがなければ左に向かって出す
return { left, top, transformOrigin: 'left center' };
}
}
};
return calc();
}
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