Trapping key up events - GameCreators Forum

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Trullion

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Posted: 11th Mar 2010 19:01

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I am having a hard time using a key to activate something in DARK GDk/C++. For example if I want to toggle autorun on I might want to press the "R" key. Then press the "R" key again to toggle it off. While I can use the dbScanKey command to trap the "R" key being down, it loops so fast that it toggles the autorun on and off before I can release the button. ANy suggestions for trapping the key-up event? Or alternate methods?

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Mireben

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Posted: 11th Mar 2010 19:50

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Use a boolean variable to store the last status of the key. Example that watches the release of the Return key:

+ Code Snippet

	bool KeyDown = false;

	while (LoopGDK())
	{
		if (dbReturnKey()) {
			KeyDown = true;
		} else if (KeyDown) {
			KeyDown = false;
			// Process key up event
		}
	}

If you have several keys to watch, store their statuses in an array.

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Cetobasilius

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Joined: 29th Dec 2009

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Posted: 11th Mar 2010 20:13

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you can also make it a timer, like so:

+ Code Snippet


int RKeyDown=0;

while (LoopGDK())
	{
		if (here goes the key condition)
                {
			RKeyDown=RKeyDown+1;
                        if(RKeyDown==1)
                        {
                              Toggle crouch
                        }
		}
                else
                {
                        RKeyDown=0;
                }
	}

so when you press it it will only activate once unless you let go and then press again.

hi

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Trullion

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Posted: 30th Mar 2010 21:20

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I thought I had posted my final code, but it isns there so I iwll post it.

I used basically a counter that engages while a key is pressed.

// global variables
int myToggleCounter = 0;
bool AutoRun = false;
bool isMounted = false;

void DoToggles()
{
	if (dbKeyState(16)) // toggle autorun
	{
		myToggleCounter = myToggleCounter + 1;
		if (myToggleCounter == 1 && autoForward == false)
			autoForward = true;
		else if (myToggleCounter == 1 && autoForward == true)
			autoForward = false;
	}
	else if (dbKeyState(17)) // toggle world interaction
	{
		myToggleCounter = myToggleCounter + 1;
		if (myToggleCounter == 1 && autoForward == false)
			autoForward = true;
		else if (myToggleCounter == 1 && autoForward == true)
			autoForward = false;
	}
	else if (dbKeyState(50)) // toggle mount
	{
		myToggleCounter = myToggleCounter + 1;
		if (myToggleCounter == 1 && charMount == noMount)
			DoMount(true);
		else if (myToggleCounter == 1 && charMount != noMount)
			DoMount(false);
	}
	else if (dbMouseClick() == 2) // toggle to prevent repeated jumping
	{
		myToggleCounter = myToggleCounter + 1;
	}
	else
		myToggleCounter = 0; // reset the toggle counter if no key is pressed.
	
	if (myToggleCounter > 200) // reset the counter if it gets to 200.
		myToggleCounter = 0;
}

+ Code Snippet

// global variables
int myToggleCounter = 0;
bool AutoRun = false;
bool isMounted = false;

void DoToggles()
{
	if (dbKeyState(16)) // toggle autorun
	{
		myToggleCounter = myToggleCounter + 1;
		if (myToggleCounter == 1 && autoForward == false)
			autoForward = true;
		else if (myToggleCounter == 1 && autoForward == true)
			autoForward = false;
	}
	else if (dbKeyState(17)) // toggle world interaction
	{
		myToggleCounter = myToggleCounter + 1;
		if (myToggleCounter == 1 && autoForward == false)
			autoForward = true;
		else if (myToggleCounter == 1 && autoForward == true)
			autoForward = false;
	}
	else if (dbKeyState(50)) // toggle mount
	{
		myToggleCounter = myToggleCounter + 1;
		if (myToggleCounter == 1 && charMount == noMount)
			DoMount(true);
		else if (myToggleCounter == 1 && charMount != noMount)
			DoMount(false);
	}
	else if (dbMouseClick() == 2) // toggle to prevent repeated jumping
	{
		myToggleCounter = myToggleCounter + 1;
	}
	else
		myToggleCounter = 0; // reset the toggle counter if no key is pressed.
	
	if (myToggleCounter > 200) // reset the counter if it gets to 200.
		myToggleCounter = 0;
}

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Trullion

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Posted: 30th Mar 2010 21:23

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The counter resets to 0 after the the key is released, so you can basically only toggle one thing at a time. Also it resets itself after 200 cycles which is about 2 or 3 seconds.

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JTK

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Posted: 31st Mar 2010 03:49 Edited at: 31st Mar 2010 04:49

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Try this: Note, conceptual example...

+ Code Snippet

static int RUNNING_MODE = FALSE;
static int RUNNING_KEY_PRESSED = FALSE;

int CurrentlyPressed = dbKeyState(RUNNING_KEY);

if (CurrentlyPressed) {
  if (!RUNNING_KEY_PRESSED)
  {
    RUNMODE = !RUN_MODE;
    RUNNING_KEY_PRESSED = TRUE;
    return;
  }
} else RUNNING_KEY_PRESSED = FALSE;

Enjoy,

JTK

edit: Oops, that's better
edit 2: Man, where is my mind today...?

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TeenCHristian

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Joined: 22nd Jun 2010

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Posted: 27th Jul 2010 16:36

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Sorry to be alittle off topic, but I had a question for trullion.

What code do you use trap a key? Your help is much appreciated!

Learning C++
Proud member of www.codecall.com

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Dark GDK / Trapping key up events