@ng-bootstrap/ng-bootstrap
Version:
Angular powered Bootstrap
208 lines • 32.8 kB
JavaScript
// previous version:
// https://github.com/angular-ui/bootstrap/blob/07c31d0731f7cb068a1932b8e01d2312b796b4ec/src/position/position.js
export class Positioning {
getAllStyles(element) { return window.getComputedStyle(element); }
getStyle(element, prop) { return this.getAllStyles(element)[prop]; }
isStaticPositioned(element) {
return (this.getStyle(element, 'position') || 'static') === 'static';
}
offsetParent(element) {
let offsetParentEl = element.offsetParent || document.documentElement;
while (offsetParentEl && offsetParentEl !== document.documentElement && this.isStaticPositioned(offsetParentEl)) {
offsetParentEl = offsetParentEl.offsetParent;
}
return offsetParentEl || document.documentElement;
}
position(element, round = true) {
let elPosition;
let parentOffset = { width: 0, height: 0, top: 0, bottom: 0, left: 0, right: 0 };
if (this.getStyle(element, 'position') === 'fixed') {
elPosition = element.getBoundingClientRect();
elPosition = {
top: elPosition.top,
bottom: elPosition.bottom,
left: elPosition.left,
right: elPosition.right,
height: elPosition.height,
width: elPosition.width
};
}
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;
}
offset(element, round = true) {
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;
}
/*
Return false if the element to position is outside the viewport
*/
positionElements(hostElement, targetElement, placement, appendToBody) {
const [placementPrimary = 'top', placementSecondary = 'center'] = placement.split('-');
const hostElPosition = appendToBody ? this.offset(hostElement, false) : this.position(hostElement, false);
const targetElStyles = this.getAllStyles(targetElement);
const marginTop = parseFloat(targetElStyles.marginTop);
const marginBottom = parseFloat(targetElStyles.marginBottom);
const marginLeft = parseFloat(targetElStyles.marginLeft);
const marginRight = parseFloat(targetElStyles.marginRight);
let topPosition = 0;
let leftPosition = 0;
switch (placementPrimary) {
case 'top':
topPosition = (hostElPosition.top - (targetElement.offsetHeight + marginTop + marginBottom));
break;
case 'bottom':
topPosition = (hostElPosition.top + hostElPosition.height);
break;
case 'left':
leftPosition = (hostElPosition.left - (targetElement.offsetWidth + marginLeft + marginRight));
break;
case 'right':
leftPosition = (hostElPosition.left + hostElPosition.width);
break;
}
switch (placementSecondary) {
case 'top':
topPosition = hostElPosition.top;
break;
case 'bottom':
topPosition = hostElPosition.top + hostElPosition.height - targetElement.offsetHeight;
break;
case 'left':
leftPosition = hostElPosition.left;
break;
case 'right':
leftPosition = hostElPosition.left + hostElPosition.width - targetElement.offsetWidth;
break;
case 'center':
if (placementPrimary === 'top' || placementPrimary === 'bottom') {
leftPosition = (hostElPosition.left + hostElPosition.width / 2 - targetElement.offsetWidth / 2);
}
else {
topPosition = (hostElPosition.top + hostElPosition.height / 2 - targetElement.offsetHeight / 2);
}
break;
}
/// The translate3d/gpu acceleration render a blurry text on chrome, the next line is commented until a browser fix
// targetElement.style.transform = `translate3d(${Math.round(leftPosition)}px, ${Math.floor(topPosition)}px, 0px)`;
targetElement.style.transform = `translate(${Math.round(leftPosition)}px, ${Math.round(topPosition)}px)`;
// Check if the targetElement is inside the viewport
const targetElBCR = targetElement.getBoundingClientRect();
const html = document.documentElement;
const windowHeight = window.innerHeight || html.clientHeight;
const windowWidth = window.innerWidth || html.clientWidth;
return targetElBCR.left >= 0 && targetElBCR.top >= 0 && targetElBCR.right <= windowWidth &&
targetElBCR.bottom <= windowHeight;
}
}
const placementSeparator = /\s+/;
export const positionService = new Positioning();
/*
* Accept the placement array and applies the appropriate placement dependent on the viewport.
* Returns the applied placement.
* In case of auto placement, placements are selected in order
* 'top', 'bottom', 'left', 'right',
* 'top-left', 'top-right',
* 'bottom-left', 'bottom-right',
* 'left-top', 'left-bottom',
* 'right-top', 'right-bottom'.
* */
export function positionElements(hostElement, targetElement, placement, appendToBody, baseClass) {
let placementVals = Array.isArray(placement) ? placement : placement.split(placementSeparator);
const allowedPlacements = [
'top', 'bottom', 'left', 'right', 'top-left', 'top-right', 'bottom-left', 'bottom-right', 'left-top', 'left-bottom',
'right-top', 'right-bottom'
];
const classList = targetElement.classList;
const addClassesToTarget = (targetPlacement) => {
const [primary, secondary] = targetPlacement.split('-');
const classes = [];
if (baseClass) {
classes.push(`${baseClass}-${primary}`);
if (secondary) {
classes.push(`${baseClass}-${primary}-${secondary}`);
}
classes.forEach((classname) => { classList.add(classname); });
}
return classes;
};
// Remove old placement classes to avoid issues
if (baseClass) {
allowedPlacements.forEach((placementToRemove) => { classList.remove(`${baseClass}-${placementToRemove}`); });
}
// replace auto placement with other placements
let hasAuto = placementVals.findIndex(val => val === 'auto');
if (hasAuto >= 0) {
allowedPlacements.forEach(function (obj) {
if (placementVals.find(val => val.search('^' + obj) !== -1) == null) {
placementVals.splice(hasAuto++, 1, obj);
}
});
}
// coordinates where to position
// Required for transform:
const style = targetElement.style;
style.position = 'absolute';
style.top = '0';
style.left = '0';
style['will-change'] = 'transform';
let testPlacement = null;
let isInViewport = false;
for (testPlacement of placementVals) {
let addedClasses = addClassesToTarget(testPlacement);
if (positionService.positionElements(hostElement, targetElement, testPlacement, appendToBody)) {
isInViewport = true;
break;
}
// Remove the baseClasses for further calculation
if (baseClass) {
addedClasses.forEach((classname) => { classList.remove(classname); });
}
}
if (!isInViewport) {
// If nothing match, the first placement is the default one
testPlacement = placementVals[0];
addClassesToTarget(testPlacement);
positionService.positionElements(hostElement, targetElement, testPlacement, appendToBody);
}
return testPlacement;
}
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previous version:\n// https://github.com/angular-ui/bootstrap/blob/07c31d0731f7cb068a1932b8e01d2312b796b4ec/src/position/position.js\nexport class Positioning {\n  private getAllStyles(element: HTMLElement) { return window.getComputedStyle(element); }\n\n  private getStyle(element: HTMLElement, prop: string): string { return this.getAllStyles(element)[prop]; }\n\n  private isStaticPositioned(element: HTMLElement): boolean {\n    return (this.getStyle(element, 'position') || 'static') === 'static';\n  }\n\n  private offsetParent(element: HTMLElement): HTMLElement {\n    let offsetParentEl = <HTMLElement>element.offsetParent || document.documentElement;\n\n    while (offsetParentEl && offsetParentEl !== document.documentElement && this.isStaticPositioned(offsetParentEl)) {\n      offsetParentEl = <HTMLElement>offsetParentEl.offsetParent;\n    }\n\n    return offsetParentEl || document.documentElement;\n  }\n\n  position(element: HTMLElement, round = true): ClientRect {\n    let elPosition: ClientRect;\n    let parentOffset: ClientRect = {width: 0, height: 0, top: 0, bottom: 0, left: 0, right: 0};\n\n    if (this.getStyle(element, 'position') === 'fixed') {\n      elPosition = element.getBoundingClientRect();\n      elPosition = {\n        top: elPosition.top,\n        bottom: elPosition.bottom,\n        left: elPosition.left,\n        right: elPosition.right,\n        height: elPosition.height,\n        width: elPosition.width\n      };\n    } else {\n      const offsetParentEl = this.offsetParent(element);\n\n      elPosition = this.offset(element, false);\n\n      if (offsetParentEl !== document.documentElement) {\n        parentOffset = this.offset(offsetParentEl, false);\n      }\n\n      parentOffset.top += offsetParentEl.clientTop;\n      parentOffset.left += offsetParentEl.clientLeft;\n    }\n\n    elPosition.top -= parentOffset.top;\n    elPosition.bottom -= parentOffset.top;\n    elPosition.left -= parentOffset.left;\n    elPosition.right -= parentOffset.left;\n\n    if (round) {\n      elPosition.top = Math.round(elPosition.top);\n      elPosition.bottom = Math.round(elPosition.bottom);\n      elPosition.left = Math.round(elPosition.left);\n      elPosition.right = Math.round(elPosition.right);\n    }\n\n    return elPosition;\n  }\n\n  offset(element: HTMLElement, round = true): ClientRect {\n    const elBcr = element.getBoundingClientRect();\n    const viewportOffset = {\n      top: window.pageYOffset - document.documentElement.clientTop,\n      left: window.pageXOffset - document.documentElement.clientLeft\n    };\n\n    let elOffset = {\n      height: elBcr.height || element.offsetHeight,\n      width: elBcr.width || element.offsetWidth,\n      top: elBcr.top + viewportOffset.top,\n      bottom: elBcr.bottom + viewportOffset.top,\n      left: elBcr.left + viewportOffset.left,\n      right: elBcr.right + viewportOffset.left\n    };\n\n    if (round) {\n      elOffset.height = Math.round(elOffset.height);\n      elOffset.width = Math.round(elOffset.width);\n      elOffset.top = Math.round(elOffset.top);\n      elOffset.bottom = Math.round(elOffset.bottom);\n      elOffset.left = Math.round(elOffset.left);\n      elOffset.right = Math.round(elOffset.right);\n    }\n\n    return elOffset;\n  }\n\n  /*\n    Return false if the element to position is outside the viewport\n  */\n  positionElements(hostElement: HTMLElement, targetElement: HTMLElement, placement: string, appendToBody?: boolean):\n      boolean {\n    const[placementPrimary = 'top', placementSecondary = 'center'] = placement.split('-');\n\n    const hostElPosition = appendToBody ? this.offset(hostElement, false) : this.position(hostElement, false);\n    const targetElStyles = this.getAllStyles(targetElement);\n\n    const marginTop = parseFloat(targetElStyles.marginTop);\n    const marginBottom = parseFloat(targetElStyles.marginBottom);\n    const marginLeft = parseFloat(targetElStyles.marginLeft);\n    const marginRight = parseFloat(targetElStyles.marginRight);\n\n    let topPosition = 0;\n    let leftPosition = 0;\n\n    switch (placementPrimary) {\n      case 'top':\n        topPosition = (hostElPosition.top - (targetElement.offsetHeight + marginTop + marginBottom));\n        break;\n      case 'bottom':\n        topPosition = (hostElPosition.top + hostElPosition.height);\n        break;\n      case 'left':\n        leftPosition = (hostElPosition.left - (targetElement.offsetWidth + marginLeft + marginRight));\n        break;\n      case 'right':\n        leftPosition = (hostElPosition.left + hostElPosition.width);\n        break;\n    }\n\n    switch (placementSecondary) {\n      case 'top':\n        topPosition = hostElPosition.top;\n        break;\n      case 'bottom':\n        topPosition = hostElPosition.top + hostElPosition.height - targetElement.offsetHeight;\n        break;\n      case 'left':\n        leftPosition = hostElPosition.left;\n        break;\n      case 'right':\n        leftPosition = hostElPosition.left + hostElPosition.width - targetElement.offsetWidth;\n        break;\n      case 'center':\n        if (placementPrimary === 'top' || placementPrimary === 'bottom') {\n          leftPosition = (hostElPosition.left + hostElPosition.width / 2 - targetElement.offsetWidth / 2);\n        } else {\n          topPosition = (hostElPosition.top + hostElPosition.height / 2 - targetElement.offsetHeight / 2);\n        }\n        break;\n    }\n\n    /// The translate3d/gpu acceleration render a blurry text on chrome, the next line is commented until a browser fix\n    // targetElement.style.transform = `translate3d(${Math.round(leftPosition)}px, ${Math.floor(topPosition)}px, 0px)`;\n    targetElement.style.transform = `translate(${Math.round(leftPosition)}px, ${Math.round(topPosition)}px)`;\n\n    // Check if the targetElement is inside the viewport\n    const targetElBCR = targetElement.getBoundingClientRect();\n    const html = document.documentElement;\n    const windowHeight = window.innerHeight || html.clientHeight;\n    const windowWidth = window.innerWidth || html.clientWidth;\n\n    return targetElBCR.left >= 0 && targetElBCR.top >= 0 && targetElBCR.right <= windowWidth &&\n        targetElBCR.bottom <= windowHeight;\n  }\n}\n\nconst placementSeparator = /\\s+/;\nexport const positionService = new Positioning();\n\n/*\n * Accept the placement array and applies the appropriate placement dependent on the viewport.\n * Returns the applied placement.\n * In case of auto placement, placements are selected in order\n *   'top', 'bottom', 'left', 'right',\n *   'top-left', 'top-right',\n *   'bottom-left', 'bottom-right',\n *   'left-top', 'left-bottom',\n *   'right-top', 'right-bottom'.\n * */\nexport function positionElements(\n    hostElement: HTMLElement, targetElement: HTMLElement, placement: string | Placement | PlacementArray,\n    appendToBody?: boolean, baseClass?: string): Placement |\n    null {\n  let placementVals: Array<Placement> =\n      Array.isArray(placement) ? placement : placement.split(placementSeparator) as Array<Placement>;\n\n  const allowedPlacements = [\n    'top', 'bottom', 'left', 'right', 'top-left', 'top-right', 'bottom-left', 'bottom-right', 'left-top', 'left-bottom',\n    'right-top', 'right-bottom'\n  ];\n\n  const classList = targetElement.classList;\n  const addClassesToTarget = (targetPlacement: Placement): Array<string> => {\n    const[primary, secondary] = targetPlacement.split('-');\n    const classes: string[] = [];\n    if (baseClass) {\n      classes.push(`${baseClass}-${primary}`);\n      if (secondary) {\n        classes.push(`${baseClass}-${primary}-${secondary}`);\n      }\n\n      classes.forEach((classname) => { classList.add(classname); });\n    }\n    return classes;\n  };\n\n  // Remove old placement classes to avoid issues\n  if (baseClass) {\n    allowedPlacements.forEach((placementToRemove) => { classList.remove(`${baseClass}-${placementToRemove}`); });\n  }\n\n  // replace auto placement with other placements\n  let hasAuto = placementVals.findIndex(val => val === 'auto');\n  if (hasAuto >= 0) {\n    allowedPlacements.forEach(function(obj) {\n      if (placementVals.find(val => val.search('^' + obj) !== -1) == null) {\n        placementVals.splice(hasAuto++, 1, obj as Placement);\n      }\n    });\n  }\n\n  // coordinates where to position\n\n  // Required for transform:\n  const style = targetElement.style;\n  style.position = 'absolute';\n  style.top = '0';\n  style.left = '0';\n  style['will-change'] = 'transform';\n\n  let testPlacement: Placement | null = null;\n  let isInViewport = false;\n  for (testPlacement of placementVals) {\n    let addedClasses = addClassesToTarget(testPlacement);\n\n    if (positionService.positionElements(hostElement, targetElement, testPlacement, appendToBody)) {\n      isInViewport = true;\n      break;\n    }\n\n    // Remove the baseClasses for further calculation\n    if (baseClass) {\n      addedClasses.forEach((classname) => { classList.remove(classname); });\n    }\n  }\n\n  if (!isInViewport) {\n    // If nothing match, the first placement is the default one\n    testPlacement = placementVals[0];\n    addClassesToTarget(testPlacement);\n    positionService.positionElements(hostElement, targetElement, testPlacement, appendToBody);\n  }\n\n  return testPlacement;\n}\n\nexport type Placement = 'auto' | 'top' | 'bottom' | 'left' | 'right' | 'top-left' | 'top-right' | 'bottom-left' |\n    'bottom-right' | 'left-top' | 'left-bottom' | 'right-top' | 'right-bottom';\n\nexport type PlacementArray = Placement | Array<Placement>| string;\n"]}