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// previous version:
// https://github.com/angular-ui/bootstrap/blob/07c31d0731f7cb068a1932b8e01d2312b796b4ec/src/position/position.js
export class Positioning {
private getStyle(element: HTMLElement, prop: string): string { return window.getComputedStyle(element)[prop]; }
private isStaticPositioned(element: HTMLElement): boolean {
return (this.getStyle(element, 'position') || 'static') === 'static';
}
private offsetParent(element: HTMLElement): HTMLElement {
let offsetParentEl = <HTMLElement>element.offsetParent || document.documentElement;
while (offsetParentEl && offsetParentEl !== document.documentElement && this.isStaticPositioned(offsetParentEl)) {
offsetParentEl = <HTMLElement>offsetParentEl.offsetParent;
}
return offsetParentEl || document.documentElement;
}
public position(element: HTMLElement, round = true): ClientRect {
let elPosition: ClientRect;
let parentOffset: ClientRect = {width: 0, height: 0, top: 0, bottom: 0, left: 0, right: 0};
if (this.getStyle(element, 'position') === 'fixed') {
elPosition = element.getBoundingClientRect();
} else {
const offsetParentEl = this.offsetParent(element);
elPosition = this.offset(element, false);
if (offsetParentEl !== document.documentElement) {
parentOffset = this.offset(offsetParentEl, false);
}
parentOffset.top += offsetParentEl.clientTop;
parentOffset.left += offsetParentEl.clientLeft;
}
elPosition.top -= parentOffset.top;
elPosition.bottom -= parentOffset.top;
elPosition.left -= parentOffset.left;
elPosition.right -= parentOffset.left;
if (round) {
elPosition.top = Math.round(elPosition.top);
elPosition.bottom = Math.round(elPosition.bottom);
elPosition.left = Math.round(elPosition.left);
elPosition.right = Math.round(elPosition.right);
}
return elPosition;
}
public offset(element: HTMLElement, round = true): ClientRect {
const elBcr = element.getBoundingClientRect();
const viewportOffset = {
top: window.pageYOffset - document.documentElement.clientTop,
left: window.pageXOffset - document.documentElement.clientLeft
};
let elOffset = {
height: elBcr.height || element.offsetHeight,
width: elBcr.width || element.offsetWidth,
top: elBcr.top + viewportOffset.top,
bottom: elBcr.bottom + viewportOffset.top,
left: elBcr.left + viewportOffset.left,
right: elBcr.right + viewportOffset.left
};
if (round) {
elOffset.height = Math.round(elOffset.height);
elOffset.width = Math.round(elOffset.width);
elOffset.top = Math.round(elOffset.top);
elOffset.bottom = Math.round(elOffset.bottom);
elOffset.left = Math.round(elOffset.left);
elOffset.right = Math.round(elOffset.right);
}
return elOffset;
}
public positionElements(hostElement: HTMLElement, targetElement: HTMLElement, placement: string, appendToBody?: boolean):
ClientRect {
const hostElPosition = appendToBody ? this.offset(hostElement, false) : this.position(hostElement, false);
const shiftWidth: any = {
left: hostElPosition.left,
left2: (hostElPosition.left - 85),
center: hostElPosition.left + hostElPosition.width / 2 - targetElement.offsetWidth / 2,
right: hostElPosition.left + hostElPosition.width
};
const shiftHeight: any = {
top: hostElPosition.top,
center: hostElPosition.top + hostElPosition.height / 2 - targetElement.offsetHeight / 2,
bottom: hostElPosition.top + hostElPosition.height
};
const targetElBCR = targetElement.getBoundingClientRect();
const placementPrimary = placement.split('-')[0] || 'top';
const placementSecondary = placement.split('-')[1] || 'center';
let targetElPosition: ClientRect = {
height: targetElBCR.height || targetElement.offsetHeight,
width: targetElBCR.width || targetElement.offsetWidth,
top: 0,
bottom: targetElBCR.height || targetElement.offsetHeight,
left: 0,
right: targetElBCR.width || targetElement.offsetWidth
};
switch (placementPrimary) {
case 'top':
targetElPosition.top = hostElPosition.top - targetElement.offsetHeight;
targetElPosition.bottom += hostElPosition.top - targetElement.offsetHeight;
targetElPosition.left = shiftWidth[placementSecondary];
targetElPosition.right += shiftWidth[placementSecondary];
break;
case 'bottom':
targetElPosition.top = shiftHeight[placementPrimary];
targetElPosition.bottom += shiftHeight[placementPrimary];
targetElPosition.left = shiftWidth[placementSecondary];
targetElPosition.right += shiftWidth[placementSecondary];
break;
case 'left':
targetElPosition.top = shiftHeight[placementSecondary];
targetElPosition.bottom += shiftHeight[placementSecondary];
targetElPosition.left = hostElPosition.left - targetElement.offsetWidth;
targetElPosition.right += hostElPosition.left - targetElement.offsetWidth;
break;
case 'right':
targetElPosition.top = shiftHeight[placementSecondary];
targetElPosition.bottom += shiftHeight[placementSecondary];
targetElPosition.left = shiftWidth[placementPrimary];
targetElPosition.right += shiftWidth[placementPrimary];
break;
}
targetElPosition.top = Math.round(targetElPosition.top);
targetElPosition.bottom = Math.round(targetElPosition.bottom);
targetElPosition.left = Math.round(targetElPosition.left);
targetElPosition.right = Math.round(targetElPosition.right);
return targetElPosition;
}
}
const positionService = new Positioning();
export function positionElements(
hostElement: HTMLElement, targetElement: HTMLElement, placement: string, appendToBody?: boolean): void {
const pos = positionService.positionElements(hostElement, targetElement, placement, appendToBody);
targetElement.style.top = `${pos.top}px`;
targetElement.style.left = `${pos.left}px`;
}
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