@ng-select/ng-select
Version:
Angular ng-select - All in One UI Select, Multiselect and Autocomplete
131 lines • 10 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @record
*/
export function ItemsRangeResult() { }
if (false) {
/** @type {?} */
ItemsRangeResult.prototype.scrollHeight;
/** @type {?} */
ItemsRangeResult.prototype.topPadding;
/** @type {?} */
ItemsRangeResult.prototype.start;
/** @type {?} */
ItemsRangeResult.prototype.end;
}
/**
* @record
*/
export function PanelDimensions() { }
if (false) {
/** @type {?} */
PanelDimensions.prototype.itemHeight;
/** @type {?} */
PanelDimensions.prototype.panelHeight;
/** @type {?} */
PanelDimensions.prototype.itemsPerViewport;
}
export class NgDropdownPanelService {
constructor() {
this._dimensions = {
itemHeight: 0,
panelHeight: 0,
itemsPerViewport: 0
};
}
/**
* @return {?}
*/
get dimensions() {
return this._dimensions;
}
/**
* @param {?} scrollPos
* @param {?} itemsLength
* @param {?} buffer
* @return {?}
*/
calculateItems(scrollPos, itemsLength, buffer) {
/** @type {?} */
const d = this._dimensions;
/** @type {?} */
const scrollHeight = d.itemHeight * itemsLength;
/** @type {?} */
const scrollTop = Math.max(0, scrollPos);
/** @type {?} */
const indexByScrollTop = scrollTop / scrollHeight * itemsLength;
/** @type {?} */
let end = Math.min(itemsLength, Math.ceil(indexByScrollTop) + (d.itemsPerViewport + 1));
/** @type {?} */
const maxStartEnd = end;
/** @type {?} */
const maxStart = Math.max(0, maxStartEnd - d.itemsPerViewport);
/** @type {?} */
let start = Math.min(maxStart, Math.floor(indexByScrollTop));
/** @type {?} */
let topPadding = d.itemHeight * Math.ceil(start) - (d.itemHeight * Math.min(start, buffer));
topPadding = !isNaN(topPadding) ? topPadding : 0;
start = !isNaN(start) ? start : -1;
end = !isNaN(end) ? end : -1;
start -= buffer;
start = Math.max(0, start);
end += buffer;
end = Math.min(itemsLength, end);
return {
topPadding,
scrollHeight,
start,
end
};
}
/**
* @param {?} itemHeight
* @param {?} panelHeight
* @return {?}
*/
setDimensions(itemHeight, panelHeight) {
/** @type {?} */
const itemsPerViewport = Math.max(1, Math.floor(panelHeight / itemHeight));
this._dimensions = {
itemHeight,
panelHeight,
itemsPerViewport
};
}
/**
* @param {?} itemTop
* @param {?} itemHeight
* @param {?} lastScroll
* @return {?}
*/
getScrollTo(itemTop, itemHeight, lastScroll) {
const { panelHeight } = this.dimensions;
/** @type {?} */
const itemBottom = itemTop + itemHeight;
/** @type {?} */
const top = lastScroll;
/** @type {?} */
const bottom = top + panelHeight;
if (panelHeight >= itemBottom && lastScroll === itemTop) {
return null;
}
if (itemBottom > bottom) {
return top + itemBottom - bottom;
}
else if (itemTop <= top) {
return itemTop;
}
return null;
}
}
if (false) {
/**
* @type {?}
* @private
*/
NgDropdownPanelService.prototype._dimensions;
}
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