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Android phone orientation overview including compass
I've been trying to get my head around the Android orientation sensors for a while.
I thought I understood it. Then I realised I didn't. Now I think (hope) I have a better feeling for it again but I am still not 100%. I will try and explain my patchy understanding of it and hopefully people will be ...
setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
...read about autolayouts–says:
If something changes later on that invalidates one of your constraints, you should remove the constraint immediately and call setNeedsUpdateConstraints. In fact, that’s the only case where you should have to trigger a constraint update pass.
In addition, in my ...
Async call with await in HttpClient never returns
I have a call I am making from inside a xaml-based, C# metro application on the Win8 CP; this call simply hits a web service and returns JSON data.
...
What does 'var that = this;' mean in JavaScript?
...llustration:
var colours = ['red', 'green', 'blue'];
document.getElementById('element').addEventListener('click', function() {
// this is a reference to the element clicked on
var that = this;
colours.forEach(function() {
// this is undefined
// that is a reference to ...
How to duplicate a git repository? (without forking)
...
@Thomas I just did this and yes, it preserved all of my history in the copy. Note that after you push and cd into the new repo, there's still nothing there because you've pushed to the remote, so you need to do a pull
–...
Assign multiple columns using := in data.table, by group
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
How can I iterate through the unicode codepoints of a Java String?
...r internal representations of Strings, and, yes, it encodes characters outside the Basic Multilingual Plane (BMP) using the surrogacy scheme.
If you know you'll be dealing with characters outside the BMP, then here is the canonical way to iterate over the characters of a Java String:
final int len...
Why would a post-build step (xcopy) occasionally exit with code 2 in a TeamCity build?
...
Even if you provide the /Y switch with xcopy, you'll still get an error when xcopy doesn't know if the thing you are copying is a file or a directory. This error will appear as "exited with code 2". When you run the same xcopy at a command p...
Assigning out/ref parameters in Moq
...public interface IGobbler
{
bool Gobble(ref int amount);
}
delegate void GobbleCallback(ref int amount); // needed for Callback
delegate bool GobbleReturns(ref int amount); // needed for Returns
var mock = new Mock<IGobbler>();
mock.Setup(m => m.Gobble(ref It.Ref<int>.I...
Why can lambdas be better optimized by the compiler than plain functions?
...t only if the surrounding function is inlined as well.
As an example, consider the following function template:
template <typename Iter, typename F>
void map(Iter begin, Iter end, F f) {
for (; begin != end; ++begin)
*begin = f(*begin);
}
Calling it with a lambda like this:
in...