@shopify/flash-list
Version:
FlashList is a more performant FlatList replacement
107 lines • 4.01 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.areDimensionsNotEqual = areDimensionsNotEqual;
exports.areDimensionsEqual = areDimensionsEqual;
exports.roundOffPixel = roundOffPixel;
exports.measureParentSize = measureParentSize;
exports.measureFirstChildLayout = measureFirstChildLayout;
exports.measureItemLayout = measureItemLayout;
var react_native_1 = require("react-native");
/**
* Measures the layout of a view relative to itselft.
* Using measure wasn't returing accurate values but this workaround does.
* Returns the x, y coordinates and dimensions of the view.
*
* @param view - The React Native View component to measure
* @returns An object containing x, y, width, and height measurements
*/
function measureLayout(view, oldLayout) {
// const layout = view.unstable_getBoundingClientRect();
// layout.width = roundOffPixel(layout.width);
// layout.height = roundOffPixel(layout.height);
// return layout;
return measureLayoutRelative(view, view, oldLayout);
}
/**
* Measures the layout of a view relative to another view.
* Useful for measuring positions relative to a specific reference view.
*
* @param view - The React Native View component to measure
* @param relativeTo - The reference view to measure against
* @returns An object containing x, y, width, and height measurements
*/
function measureLayoutRelative(view, relativeTo, oldLayout) {
var layout = { x: 0, y: 0, width: 0, height: 0 };
view.measureLayout(relativeTo, function (x, y, width, height) {
layout.x = x;
layout.y = y;
layout.width = roundOffPixel(width);
layout.height = roundOffPixel(height);
});
if (oldLayout) {
if (areDimensionsEqual(layout.width, oldLayout.width)) {
layout.width = oldLayout.width;
}
if (areDimensionsEqual(layout.height, oldLayout.height)) {
layout.height = oldLayout.height;
}
}
return layout;
}
/**
* Checks if two dimension values are not equal, with a small tolerance.
* Used to handle floating-point precision issues in layout measurements.
*
* @param value1 - First dimension value to compare
* @param value2 - Second dimension value to compare
* @returns true if the values are significantly different, false otherwise
*/
function areDimensionsNotEqual(value1, value2) {
return !areDimensionsEqual(value1, value2);
}
/**
* Checks if two dimension values are equal, with a small tolerance.
* Used to handle floating-point precision issues in layout measurements.
*
* @param value1 - First dimension value to compare
* @param value2 - Second dimension value to compare
* @returns true if the values are approximately equal, false otherwise
*/
function areDimensionsEqual(value1, value2) {
return (Math.abs(react_native_1.PixelRatio.getPixelSizeForLayoutSize(value1) -
react_native_1.PixelRatio.getPixelSizeForLayoutSize(value2)) <= 1);
}
function roundOffPixel(value) {
return react_native_1.PixelRatio.roundToNearestPixel(value);
}
/**
* Specific method for easier mocking
* Measures the layout of parent of RecyclerView
* Returns the x, y coordinates and dimensions of the view.
* @param view - The React Native View component to measure
* @returns An object containing x, y, width, and height measurements
*/
function measureParentSize(view) {
return measureLayout(view, undefined);
}
/**
* Specific method for easier mocking
* Measures the layout of child container of RecyclerView
* @param childContainerView
* @param parentView
* @returns
*/
function measureFirstChildLayout(childContainerView, parentView) {
return measureLayoutRelative(childContainerView, parentView, undefined);
}
/**
* Specific method for easier mocking
* Measures the layout of items of RecyclerView
* @param item
* @param oldLayout
* @returns
*/
function measureItemLayout(item, oldLayout) {
return measureLayout(item, oldLayout);
}
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