@mai3/phaser-sdk/dist/utils/ScrollUtils.js

A UI component library based on the Phaser game engine

import { Container } from "../ui/Container";
var ScrollUtils = /** @class */ (function () {
    function ScrollUtils() {
    }
    ScrollUtils.calculateNewPosition = function (position, direction, viewSize, scrollSize, padding, borderWidth) {
        var _a, _b;
        var max = ((_b = (_a = padding.all) !== null && _a !== void 0 ? _a : (direction === "y" ? padding.top : padding.left)) !== null && _b !== void 0 ? _b : 0) +
            borderWidth;
        var min = Math.min(0, viewSize - (scrollSize || 0));
        return Phaser.Math.Clamp(position, min, max);
    };
    ScrollUtils.updateScrollBarPosition = function (content, scrollBar, direction, viewSize, scrollSize, padding) {
        var _a, _b, _c, _d;
        if (!scrollBar)
            return;
        var currentPos = content[direction] -
            ((_b = (_a = padding.all) !== null && _a !== void 0 ? _a : (direction === "y" ? padding.top : padding.left)) !== null && _b !== void 0 ? _b : 0);
        var scrollPercent = Math.abs(currentPos) /
            (scrollSize + ((_d = (_c = padding === null || padding === void 0 ? void 0 : padding.all) !== null && _c !== void 0 ? _c : padding === null || padding === void 0 ? void 0 : padding.top) !== null && _d !== void 0 ? _d : 0) - viewSize);
        scrollBar.updateThumbPosition(scrollPercent);
    };
    ScrollUtils.updateVisibleItems = function (content, direction, viewSize) {
        var viewportStart = -content[direction];
        var viewportEnd = viewportStart + viewSize;
        content.list.forEach(function (child) {
            if (child instanceof Container) {
                var itemStart = child[direction];
                var itemEnd = itemStart + (direction === "y" ? child.Height : child.Width);
                child.visible = itemEnd >= viewportStart && itemStart <= viewportEnd;
            }
        });
    };
    return ScrollUtils;
}());
export default ScrollUtils;