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@paulirish
paulirish / what-forces-layout.md
Last active May 20, 2024 17:15
What forces layout/reflow. The comprehensive list.

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics
  • elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
@remarkablemark
remarkablemark / Dockerfile
Last active May 17, 2024 02:03
Install node and npm with nvm using Docker.
# set the base image to Debian
# https://hub.docker.com/_/debian/
FROM debian:latest
# replace shell with bash so we can source files
RUN rm /bin/sh && ln -s /bin/bash /bin/sh
# update the repository sources list
# and install dependencies
RUN apt-get update \
@gaearon
gaearon / slim-redux.js
Last active May 5, 2024 15:14
Redux without the sanity checks in a single file. Don't use this, use normal Redux. :-)
function mapValues(obj, fn) {
return Object.keys(obj).reduce((result, key) => {
result[key] = fn(obj[key], key);
return result;
}, {});
}
function pick(obj, fn) {
return Object.keys(obj).reduce((result, key) => {
if (fn(obj[key])) {
vec2 rotate(vec2 v, float a) {
float s = sin(a);
float c = cos(a);
mat2 m = mat2(c, s, -s, c);
return m * v;
}
0 = Success
1 = Operation not permitted
2 = No such file or directory
3 = No such process
4 = Interrupted system call
5 = Input/output error
6 = No such device or address
7 = Argument list too long
8 = Exec format error
@scottyab
scottyab / SignatureCheck.java
Last active January 30, 2024 15:22
Simple Android signature check. Please note: This was created in 2013, not actively maintained and may not be compatible with the latest Android versions. It's not particularly difficult for an attacker to decompile an .apk, find this tamper check, replace the APP_SIGNATURE with theirs and rebuild (or use method hooking to return true from `vali…
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
public class TamperCheck {
//we store the hash of the signture for a little more protection
private static final String APP_SIGNATURE = "1038C0E34658923C4192E61B16846";
@wenzhixin
wenzhixin / ubuntu14.04-command-line-install-android-sdk
Last active January 16, 2024 21:15
Ubuntu 14.04 command line install android sdk
# install openjdk
sudo apt-get install openjdk-7-jdk
# download android sdk
wget http://dl.google.com/android/android-sdk_r24.2-linux.tgz
tar -xvf android-sdk_r24.2-linux.tgz
cd android-sdk-linux/tools
# install all sdk packages
@fnky
fnky / hooks.js
Last active January 7, 2024 12:32
React Hooks: useReducer with actions and selectors (Redux-like)
function useSelectors(reducer, mapStateToSelectors) {
const [state] = reducer;
const selectors = useMemo(() => mapStateToSelectors(state), [state]);
return selectors;
}
function useActions(reducer, mapDispatchToActions) {
const [, dispatch] = reducer;
const actions = useMemo(() => mapDispatchToActions(dispatch), [dispatch]);
return actions;
@collinjackson
collinjackson / main.dart
Last active August 17, 2023 20:06
PageView example with dots indicator
// Copyright 2017, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'dart:math';
import 'package:flutter/material.dart';
void main() {
runApp(new MyApp());
}