Multiple key presses: keyReleased() issue

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antaresxxi

Multiple key presses: keyReleased() issue

in Programming Questions • 8 months ago

Hi everybody!

I'm trying to use code from http://wiki.processing.org/w/Multiple_key_presses ( Option 1 ) to detect m ultiple key presses in my simple game project. But there's the strange issue that occurs for me, but not at every launch.

Sometimes when I'm holding a key (for example "a"), keyReleased() method is called unexpectedly after few seconds. It sets my keys [ keyCode ] to false (just like in the Option 1 example) and it fails my game logic.

Is this a bug? Or am I doing something wrong?

Replies(8)

antaresxxi

Re: Multiple key presses: keyReleased() issue

8 months ago

So, could anybody help me?

PhiLho

Re: Multiple key presses: keyReleased() issue

8 months ago

When you keep a key pressed, generally the system starts the key repeat.
How it is done exactly (repeat key down, up, both?) depend on system, Linux doesn't react like Windows for example.
I suggest to make a simple, small testbed test to study how the keys work on your system.

antaresxxi

Re: Multiple key presses: keyReleased() issue

8 months ago

Huh, this is totally weird.. The code below works perfect fot me:

boolean[] keys = new boolean[526];
void setup() {
size(200, 200, P2D);
}
void draw() {
}
void keyPressed() {
println("Pressed");
keys[keyCode] = true;
}
void keyReleased() {
println("Released");
keys[keyCode] = false;
}

BUT!!! After I added the ArrayList variable and initialized it in setup() this code began to behave unexpectedly again...

boolean[] keys = new boolean[526];
ArrayList<String> strs; // does this line lead to problem appearance???
void setup() {
size(200, 200, P2D);
strs = new ArrayList<String>(); // does this line lead to problem appearance???
}
void draw() {
}
void keyPressed() {
println("Pressed");
keys[keyCode] = true;
}
void keyReleased() {
println("Released");
keys[keyCode] = false;
}

I'm confused. I run it on Windows XP. I tried this code many times and it works fine without ArrayList, but fails with ArrayList initialization presents.

I really need your help guys!!! Maybe somebody could try the same code on his machine and will find out what the problem is...

PhiLho

Re: Multiple key presses: keyReleased() issue

8 months ago

I see absolutely no reason why this object initialization would affect the code...
I tested the code on my Windows 7 (Processing 2.0b7) and it seems to work as expected.
Not sure what you mean by "it fails", anyway.

antaresxxi

Re: Multiple key presses: keyReleased() issue

8 months ago

Yeap, you're right, initialization is not the cause, that was pretty silly assumption. B y "it fails" I mean that keyReleased() is called unexpectedly.

The code works as I expect with Processing 2.0b6, but not with Processing 2.0b7 unfortunately. Maybe there were some changes in keyboard handling behaviour in 2.0b7 version.

I'll look at the changelog, but maybe somebody knows what may be the cause of the problem?

PhiLho

Re: Multiple key presses: keyReleased() issue

8 months ago

Mmm, I tested (with your test code) with simultaneous keypresses, adding the keyCode in the println(), and found out the same behavior in 1.5.1 and in 2.0b7.
If I press three keys, that's the last which is repeated. But no keyReleased called before I physically do so, even over several seconds.

antaresxxi

Re: Multiple key presses: keyReleased() issue

8 months ago

I tested it on Mac OS 10.7.5 and Windows 7 with both 2.0b6 and 2.0b7 and it worked perfect. But when I compile and run it on my Windows XP SP3 with 2.0b7 it doesn't work. Interesting that when I compile it on Mac OS for example and after that run it on XP it works nevertheless...

antaresxxi

Re: Multiple key presses: keyReleased() issue

7 months ago

Aha! That's what I've found:

http://code.google.com/p/processing/issues/detail?id=1584&colspec=Stars%20ID%20Type%20Status%20Priority%20Owner%20Summary

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