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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...his event, so it detects the rotation even when we do not intend it to. In order to solve this problem, we add a buffer when we detect $MotionEvent.ACTION_MOVE$, so that we only fire “rotation” when the positions of two fingers change above some threshold.
Figure 6. Block designed for Rotatio...
C/C++ Struct vs Class
...elopers. I like the struct keyword for classes that merely hold data in an ordered fashion but not provide (much) logic themselves.
– ypnos
May 1 '10 at 14:30
...
Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
...de just the declaration, and the source file contains the definition.
In order to use something you only need to know it's declaration not it's definition. Only the linker needs to know the definition.
So this is why you will include a header file inside one or more source files but you won't in...
Should developers have administrator permissions on their PC
...machine they are using. Most debugging tools require admin permissions in order to hook into the runtime of the application they are building.
Further, devs frequently download and try new things. Adding additional steps such as needing a network admin to come by and install something for them si...
Git error: “Host Key Verification Failed” when connecting to remote repository
...r lead me to realize I had to manually clone my repo on my build server in order to type 'yes' and get my bitbucket server added to my known_hosts
– Sashah
Nov 20 '17 at 20:34
1
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Load and execution sequence of a web page?
...you might get a
sequence like the following, where a
page has (in this order) references
to three script files, and five image
files, all of differing sizes:
GET script1 and script2; queue request for script3 and images1-5.
script2 arrives (it's smaller than script1): GET script3,...
Lock, mutex, semaphore… what's the difference?
...task to another. A mutex is meant to be taken and released, always in that order, by each task that uses the shared resource it protects. By contrast, tasks that use semaphores either signal or wait—not both."
– ToolmakerSteve
Feb 2 '17 at 5:14
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Why is “import *” bad?
..."might shadow some other object from previous import"): import * makes the order of the import statements significant... even for standard library modules that don't normally care about import order. Something as innocent as alphabetizing your import statements could break your script when a former...
How can I repeat a character in Bash?
... and are the average of 1000 runs.
The entries are:
listed in ascending order of execution duration (fastest first)
prefixed with:
M ... a potentially multi-character solution
S ... a single-character-only solution
P ... a POSIX-compliant solution
followed by a brief description of the solutio...
Efficiently test if a port is open on Linux?
...
In order to check for port 80 I needed to use awk '$6 == "LISTEN" && $4 ~ "80$"'. Instead of checking for the dot before the port number with \.80, I used 80$. Otherwise, this also matched IP addresses containing .80 and...