158 lines
4.3 KiB
TypeScript
158 lines
4.3 KiB
TypeScript
|
|
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;
|
|
|
|
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.pageXOffset + (props.anchorElement.offsetWidth / 2);
|
|
top = (rect.top + window.pageYOffset - contentHeight) - props.innerMargin;
|
|
} else {
|
|
left = props.x;
|
|
top = (props.y - contentHeight) - props.innerMargin;
|
|
}
|
|
|
|
left -= (el.offsetWidth / 2);
|
|
|
|
if (left + contentWidth - window.pageXOffset > window.innerWidth) {
|
|
left = window.innerWidth - contentWidth + window.pageXOffset - 1;
|
|
}
|
|
|
|
return [left, top];
|
|
};
|
|
|
|
const calcPosWhenBottom = () => {
|
|
let left: number;
|
|
let top: number;
|
|
|
|
if (props.anchorElement) {
|
|
left = rect.left + window.pageXOffset + (props.anchorElement.offsetWidth / 2);
|
|
top = (rect.top + window.pageYOffset + props.anchorElement.offsetHeight) + props.innerMargin;
|
|
} else {
|
|
left = props.x;
|
|
top = (props.y) + props.innerMargin;
|
|
}
|
|
|
|
left -= (el.offsetWidth / 2);
|
|
|
|
if (left + contentWidth - window.pageXOffset > window.innerWidth) {
|
|
left = window.innerWidth - contentWidth + window.pageXOffset - 1;
|
|
}
|
|
|
|
return [left, top];
|
|
};
|
|
|
|
const calcPosWhenLeft = () => {
|
|
let left: number;
|
|
let top: number;
|
|
|
|
if (props.anchorElement) {
|
|
left = (rect.left + window.pageXOffset - contentWidth) - props.innerMargin;
|
|
top = rect.top + window.pageYOffset + (props.anchorElement.offsetHeight / 2);
|
|
} else {
|
|
left = (props.x - contentWidth) - props.innerMargin;
|
|
top = props.y;
|
|
}
|
|
|
|
top -= (el.offsetHeight / 2);
|
|
|
|
if (top + contentHeight - window.pageYOffset > window.innerHeight) {
|
|
top = window.innerHeight - contentHeight + window.pageYOffset - 1;
|
|
}
|
|
|
|
return [left, top];
|
|
};
|
|
|
|
const calcPosWhenRight = () => {
|
|
let left: number;
|
|
let top: number;
|
|
|
|
if (props.anchorElement) {
|
|
left = (rect.left + props.anchorElement.offsetWidth + window.pageXOffset) + props.innerMargin;
|
|
|
|
if (props.align === 'top') {
|
|
top = rect.top + window.pageYOffset;
|
|
if (props.alignOffset != null) top += props.alignOffset;
|
|
} else if (props.align === 'bottom') {
|
|
// TODO
|
|
} else { // center
|
|
top = rect.top + window.pageYOffset + (props.anchorElement.offsetHeight / 2);
|
|
top -= (el.offsetHeight / 2);
|
|
}
|
|
} else {
|
|
left = props.x + props.innerMargin;
|
|
top = props.y;
|
|
top -= (el.offsetHeight / 2);
|
|
}
|
|
|
|
if (top + contentHeight - window.pageYOffset > window.innerHeight) {
|
|
top = window.innerHeight - contentHeight + window.pageYOffset - 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.pageYOffset < 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.pageXOffset < 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();
|
|
}
|