vscroll/dist/esm5/processes/clip.js

Virtual scroll engine

import { __extends } from "tslib";
import { BaseProcessFactory, CommonProcess, ProcessStatus } from './misc/index';
import { Direction } from '../inputs/index';
var Clip = /** @class */ (function (_super) {
  __extends(Clip, _super);
  function Clip() {
    return _super !== null && _super.apply(this, arguments) || this;
  }
  Clip.run = function (scroller) {
    var workflow = scroller.workflow;
    Clip.doClip(scroller);
    workflow.call({
      process: Clip.process,
      status: ProcessStatus.next
    });
  };
  Clip.doClip = function (scroller) {
    var _a;
    var buffer = scroller.buffer, viewport = scroller.viewport, state = scroller.state, logger = scroller.logger;
    var size = (_a = {}, _a[Direction.backward] = 0, _a[Direction.forward] = 0, _a);
    logger.stat("before clip (".concat(++state.clip.callCount, ")"));
    var itemsToRemove = buffer.items.filter(function (item) {
      if (!item.toRemove) {
        return false;
      }
      item.hide();
      size[item.removeDirection] += item.size;
      return true;
    });
    if (itemsToRemove.length) {
      if (size[Direction.backward]) {
        viewport.paddings.byDirection(Direction.backward).size += size[Direction.backward];
      }
      if (size[Direction.forward]) {
        viewport.paddings.byDirection(Direction.forward).size += size[Direction.forward];
      }
      if (scroller.settings.onBeforeClip) {
        scroller.settings.onBeforeClip(itemsToRemove.map(function (item) { return item.get(); }));
      }
    }
    buffer.clip();
    logger.log(function () {
      var list = itemsToRemove.map(function (_a) {
        var $index = _a.$index;
        return $index;
      });
      return list.length
        ? [
          "clipped ".concat(list.length, " item(s) from Buffer") +
            (size.backward ? ", +".concat(size.backward, " fwd px") : '') +
            (size.forward ? ", +".concat(size.forward, " bwd px") : '') +
            ", range: [".concat(list[0], "..").concat(list[list.length - 1], "]")
        ]
        : 'clipped 0 items from Buffer';
    });
    logger.stat('after clip');
  };
  return Clip;
}(BaseProcessFactory(CommonProcess.clip)));
export default Clip;
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