Re: What are these functions called and how to implement they?
On Thursday, 28 January 2021 at 18:56:15 UTC, frame wrote:
On Thursday, 28 January 2021 at 18:27:09 UTC, frame wrote:
[...]
A very simple example:
bool myEventA = true;
bool myEventB = false;
// event source that generates the event (must be called to run)
void source() {
observe(myEventA);
}
// routine that decides what handler to call
void observe(bool event) {
switch (event) {
case true:
onMyEventA(event);
break;
case false:
onMyEventB(event);
break;
default:
assert(0);
}
}
// handler
void onMyEventA(bool event) {
// do something
}
void onMyEventB(bool event) {
// do something
}
Thank you, I'll try it
Re: What are these functions called and how to implement they?
On Thursday, 28 January 2021 at 18:27:09 UTC, frame wrote:
Not 100% sure what you mean but I guess you ask how to
implement a handler? If an event occurs, a routine decides to
call your onKeyPressed function and pass the keyCode which was
pressed. The routine must be registered on a event source that
will emit the events. The routine is basically just a callback
and that is indeed called every frame again if an event occurs.
A very simple example:
bool myEventA = true;
bool myEventB = false;
// event source that generates the event (must be called to run)
void source() {
observe(myEventA);
}
// routine that decides what handler to call
void observe(bool event) {
switch (event) {
case true:
onMyEventA(event);
break;
case false:
onMyEventB(event);
break;
default:
assert(0);
}
}
// handler
void onMyEventA(bool event) {
// do something
}
void onMyEventB(bool event) {
// do something
}
Re: What are these functions called and how to implement they?
On Thursday, 28 January 2021 at 17:10:57 UTC, dog2002 wrote:
I saw these functions in some projects. For example: in Dagon
(https://gecko0307.github.io/dagon/) there are functions like
onKeyDown. This function doesn't need to call - it checks
pressed keys every time. Or Update in Unity (game engine). It
doesn't need to call, but it executes itself every frame.
Okay, maybe it sounds confusing. I just want to understand how
to implement functions that wait for events and execute code
inside the function. Something like this:
void onKeyPressed(int key) {
//the code to be executed if a key has been pressed
}
Not 100% sure what you mean but I guess you ask how to implement
a handler? If an event occurs, a routine decides to call your
onKeyPressed function and pass the keyCode which was pressed. The
routine must be registered on a event source that will emit the
events. The routine is basically just a callback and that is
indeed called every frame again if an event occurs.
What are these functions called and how to implement they?
I saw these functions in some projects. For example: in Dagon
(https://gecko0307.github.io/dagon/) there are functions like
onKeyDown. This function doesn't need to call - it checks pressed
keys every time. Or Update in Unity (game engine). It doesn't
need to call, but it executes itself every frame.
Okay, maybe it sounds confusing. I just want to understand how to
implement functions that wait for events and execute code inside
the function. Something like this:
void onKeyPressed(int key) {
//the code to be executed if a key has been pressed
}
