77 lines
2.6 KiB
TypeScript
77 lines
2.6 KiB
TypeScript
// Copyright 2017-2023 @polkadot/react-components authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { ElementPosition } from '@polkadot/react-hooks/useElementPosition';
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import { WindowSize } from '@polkadot/react-hooks/useWindowSize';
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import { HorizontalPosition, VerticalPosition } from './types';
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// 0.8rem
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const POINTER_OFFSET = 14 * 0.8;
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// we don't want our popup window to cover apps menu
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const MENU_BAR_HEIGHT = 56;
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// adds 1rem margin between browsers window and popup
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const FIXED_VERTICAL_OFFSET_MARGIN = 14;
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export function getPosition (
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triggerPosition: ElementPosition,
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positionX: HorizontalPosition,
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positionY: VerticalPosition,
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windowPosition: ElementPosition,
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scrollY: number,
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windowSize: WindowSize
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): {x: number, y: number} {
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const globalX = triggerPosition.x + (triggerPosition.width / 2);
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const globalY = triggerPosition.y + scrollY + (triggerPosition.height / 2);
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return {
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x: globalX - getHorizontalOffset(windowPosition.width, positionX),
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y: fitsInView(positionY, triggerPosition, windowPosition.height, windowSize, scrollY)
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? globalY + getVerticalOffset(triggerPosition.height, positionY, windowPosition.height)
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: getFixedVerticalPosition(scrollY, positionY, windowSize, windowPosition.height)
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};
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}
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function getHorizontalOffset (popupWindowWidth: number, position: HorizontalPosition): number {
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if (position === 'left') {
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return popupWindowWidth - POINTER_OFFSET;
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}
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if (position === 'right') {
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return POINTER_OFFSET;
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}
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return (popupWindowWidth / 2);
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}
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function fitsInView (positionY: VerticalPosition, trigger: ElementPosition, popupWindowHeight: number, windowSize: WindowSize, scrollY: number): boolean {
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const { height: triggerHeight, y: triggerY } = trigger;
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if (positionY === 'bottom') {
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return windowSize.height - triggerHeight - triggerY - FIXED_VERTICAL_OFFSET_MARGIN > popupWindowHeight;
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}
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return scrollY < MENU_BAR_HEIGHT
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? triggerY - (MENU_BAR_HEIGHT - scrollY) > popupWindowHeight
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: triggerY > popupWindowHeight;
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}
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function getVerticalOffset (triggerHeight: number, position: VerticalPosition, windowHeight: number): number {
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if (position === 'bottom') {
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return triggerHeight / 2;
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}
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return (triggerHeight / 2 + windowHeight + POINTER_OFFSET) * -1;
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}
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function getFixedVerticalPosition (scrollY: number, position: VerticalPosition, windowSize: WindowSize, popupWindowHeight: number): number {
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if (position === 'bottom') {
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return scrollY + windowSize.height - popupWindowHeight - FIXED_VERTICAL_OFFSET_MARGIN;
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}
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return scrollY < MENU_BAR_HEIGHT
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? MENU_BAR_HEIGHT
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: scrollY;
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}
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