I was just curious if I add an a EventListener such as addEventListener(MouseEvent.CLICK, onClick);
Inside an ENTER_FRAME event function will it add an instance of that MouseEvent Listener every frame?
Here is my code now just wondering if this is bad practice:
addEventListener(Event.ENTER_FRAME, engineLogic);
inside my engineLogic function:
//Max objects for rock throwers on left
if (aXPositionArray.length == 0)
{
//Remove listener to add more and make button turn grey etc
rockThrowerSpawnScreen.left.removeEventListener(MouseEvent.CLICK, chooseSpawnSideRockThrowers);
rockThrowerSpawnScreen.left.visible = false;
}else
if (aXPositionArray.length != 0)
{
rockThrowerSpawnScreen.left.addEventListener(MouseEvent.CLICK, chooseSpawnSideRockThrowers);
rockThrowerSpawnScreen.left.visible = true;
trace("LISTENER");
}
or does it only add it once and checks the function every frame?
Related
I am a new new person who learn action script 3.
i have problem when i convert keyboard event to mouse event when i moving a walking character.
when use the keyboard event i have no problem. this is my code
import flash.ui.Keyboard;
var speed:Number=2;
stage.addEventListener(KeyboardEvent.KEY_DOWN, stikman);
function stikman(e:KeyboardEvent)
{
if (e.keyCode==Keyboard.LEFT)
{
stik.x-=speed;
stik.scaleX=-1;
stik.stik2.play();
}
else if (e.keyCode==Keyboard.RIGHT)
{
stik.x+=speed;
stik.scaleX=1;
stik.stik2.play();
}
}
and then i try to change keyboard event to mouse event when moving character with button it should press click, click and click. i want to hold the click when moving the character and when mouse up the character stop. but i still don't know how. this my code when i try to change to mouse event
var speed:Number=2;
mundur.addEventListener(MouseEvent.MOUSE_DOWN, stikman);
function stikman(e:MouseEvent)
{
stik.x-=speed;
stik.scaleX=-1;
stik.stik2.play();
}
maju.addEventListener(MouseEvent.CLICK, stikman2);
function stikman2(e:MouseEvent)
{
stik.x+=speed;
stik.scaleX=1;
stik.stik2.play();
}
Because keyboard produces KeyboardEvent.KEY_DOWN event repeatedly as long as key is pressed, while MouseEvent.CLICK as well as MouseEvent.MOUSE_DOWN are dispatched only once per user action.
With mouse you need to change the logic.
// Subscribe both buttons.
ButtonRight.addEventListener(MouseEvent.MOUSE_DOWN, onButton);
ButtonLeft.addEventListener(MouseEvent.MOUSE_DOWN, onButton);
var currentSpeed:Number = 0;
var isPlaying:Boolean = false;
function onButton(e:MouseEvent):void
{
// Set up the directions and start the animation.
switch (e.currentTarget)
{
case ButtonLeft:
currentSpeed = -speed;
stik.stik2.play();
stik.scaleX = -1;
break;
case ButtonRight:
currentSpeed = speed;
stik.stik2.play();
stik.scaleX = 1;
break;
}
isPlaying = true;
// Call repeatedly to move character.
addEventListener(Event.ENTER_FRAME, onFrame);
// Hook the MOUSE_UP even even if it is outside the button or even stage.
stage.addEventListener(MouseEvent.MOUSE_UP, onUp);
}
function onFrame(e:Even):void
{
// Move character by the designated offset each frame.
stik.x += currentSpeed;
if (!isPlaying)
{
// Stop at last frame.
// if (stik.stik2.currentFrame == stik.stik2.totalFrames)
// Stop at frame 1.
if (stik.stik2.currentFrame == 1)
{
// Stop the animation.
stik.stik2.stop();
// Stop moving.
removeEventListener(Event.ENTER_FRAME, onFrame);
}
}
}
function onUp(e:MouseEvent):void
{
// Indicate to stop when the animation ends.
isPlaying = false;
// Unhook the MOUSE_UP event.
stage.removeEventListener(MouseEvent.MOUSE_UP, onUp);
}
I have a dropdown menu that lets you select an item to be placed on the stage. The item is drag and droppable so I use event.currentTarget.startDrag(); to start the drag. Ok, everything works fine so far.
However, I also need to be able to rotate the item while it is being dragged (using the spacebar).
stage.addEventListener(KeyboardEvent.KEY_DOWN, myKeyDown);
function myKeyDown(e:KeyboardEvent):void{
if (e.keyCode == Keyboard.SPACE){
rotate++;
if (rotate == 5){
rotate = 1;
}
WHATGOESHERE?.gotoAndStop(rotate);
}
If I hardcode in an instance name of an object everything works fine - so the rotate function is working properly. The problem is, how can I reference event.currentTarget from the startDrag function while inside of the keyDown event?
My first thought was to set event.currentTarget to a variable and then calling the variable from within the keyDown event. However, targetHold = event.currentTarget; does not seem to record the instance name of the object being clicked...
public var targetHold:Object = new Object;
function ClickToDrag(event:MouseEvent):void {
event.currentTarget.startDrag();
targetHold = event.currentTarget;
trace ("targetHold " + targetHold);
stage.addEventListener(KeyboardEvent.KEY_DOWN, myKeyDown);
function myKeyDown(e:KeyboardEvent):void{
if (e.keyCode == Keyboard.SPACE){
rotate++;
if (rotate == 5){
rotate = 1;
}
targetHold.gotoAndStop(rotate); //does not work
}
}
function ReleaseToDrop(event:MouseEvent):void {
event.currentTarget.stopDrag();
}
As you click the object, it should have focus. If you register the listener for the KeyboardEvent on the object and not on the stage, it will be .currentTarget.
Here's an example of what I have in mind. Right after starting the drag, add the listener to the same object instead of the stage.
event.currentTarget.startDrag();
event.currentTarget.addEventListener(KeyboardEvent.KEY_DOWN, myKeyDown);
The proper way of doing this would be to define all the functionality in a class. Within a self contained class, you would not need any .currentTarget.
Here is how I would do this: (well, actually I'd follow #null's advice and encapsulate it in a sub class that all your dragable objects would extend, but that is a little broad so this will do)
public var targetHold:MovieClip; //don't make a new object, just create the empty var
public function YourConstructor(){
//your other constructor code
stage.addEventListener(KeyboardEvent.KEY_DOWN, myKeyDown); //don't add the listener in the click function
}
private function clickToDrag(event:MouseEvent):void {
if(targetHold) ReleaseToDrop(null); //safeguard in case flash lost the focus during the mouse up
targetHold = event.currentTarget as MovieClip; //assign the current target. Might as well cast it as MovieClip and get code completion benefits
targetHold.startDrag();
trace ("targetHold " + targetHold);
}
private function myKeyDown(e:KeyboardEvent):void{
//check if target hold exists
if (targetHold != null && e.keyCode == Keyboard.SPACE){
rotate++;
if (rotate == 5){
rotate = 1;
}
targetHold.gotoAndStop(rotate);
}
}
private function ReleaseToDrop(event:MouseEvent):void {
if(targetHold) targetHold.stopDrag();
targetHold = null;
}
Hey guys I am having a problem with Event Listeners in my AS3 file. I am trying to make this object that lasts for 83 frames to appear in a different location every time the parent (83 frame) movie clip resets. The problem is I have a function that places the object at a random y value which works great once. When it resets the ojbect appears on the same Y point. This is because I removeEventListener the function otherwise the object goes shooting off the screen when it loads. How do I call that event listener again without causing a loop that will shoot the object off screen?
Here is my code:
import flash.events.Event;
stop();
addEventListener(Event.ENTER_FRAME, SeaWeedPostion);
//stage.addEventListener(Event.ADDED_TO_STAGE, SeaWeedPostion);
function SeaWeedPostion(e:Event):void{
// if(newSeaWeed == 1) {
var randUint:uint = uint(Math.random() *500 + 50);
this.seaweedSet.y += randUint;
trace(randUint);
stopPos();
//}else{
//nothing
// }
}
function stopPos():void{
removeEventListener(Event.ENTER_FRAME, SeaWeedPostion);
//var newSeaWeed = 0;
}
function resetSeaWeed():void{
addEventListener(Event.ENTER_FRAME, SeaWeedPostion);
}
I have some // code in there from trying different things.
Anyone have any suggestions?
Thanks!
ENTER_FRAME event is triggered every frame, so rather than changing position on each frame maybe it's better to create a counter, count frames and if it reaches 82 change position of SeaWeed.
var counter:uint = 0;
Now add ENTER_FRAME listener
addEventListener(Event.ENTER_FRAME, onEnterFrame);
function SeaWeedPostion(e:Event):void {
counter++;
//Are we there yet?
if(counter < 83) {
//Nope, carry on
}
else {
//Yey!
changePosition();
counter = 0;
}
}
//Reset SeaWeed position when called
function changePosition() {
var randUint:uint = uint(Math.random() *500 + 50);
this.seaweedSet.y += randUint;
trace(randUint);
}
Trying to get an animation to play backwards while a button is held down, which works fine, however when it gets to the first frame it just stops and won't loop back around to the last frame of the animation- how might one accomplish this? It seems like I need to break the event for a frame somehow and then start listening again...
backward_btn.addEventListener(MouseEvent.MOUSE_DOWN, setDownTrue);
backward_btn.addEventListener(MouseEvent.MOUSE_UP, setDownFalse);
addEventListener(Event.ENTER_FRAME, checkDown);
var isDown:Boolean = false;
function setDownTrue(e:MouseEvent){
isDown = true;
}
function setDownFalse(e:MouseEvent){
isDown = false;
}
function checkDown(e:Event){
if(isDown == true){
prevFrame();
if(currentFrame == 1){
gotoAndStop(120); //120 is the last frame of the animation
isDown = false;
}
}
}
Thanks!
The ENTER_FRAME event is not your problem, it continues to trigger. However, isDown turns into false on the last frame. You should change isDown = false; to isDown = true; after the gotoAndStop line in order to loop continuously.
I actually just helped a co-worker with this:
myMovieClip //your instance on the stage
lets say you want your movieclip to play backwards on click:
myMovieClip.addEventListener(MouseEvent.CLICK, onClick);
function onClick(e:MouseEvent):void
{
addEventListener(Event.ENTER_FRAME, playBackwards);
}
function playBackwards(e:Event):void
{
var frame:int = myMovieClip.currentFrame -1; //get frame before current;
myMovieClip.gotoAndStop(frame); // go to that frame
if(frame == 1) removeEventListener(Event.ENTER_FRAME, playBackwards); //if the frame is the first frame then remove the enterframe event
}
Save yourself some trouble and use totalFrames:
if(currentFrame == 1)
gotoAndStop(totalFrames);
else prevFrame();
I've been fumbling with this issue for a bit. I've got a lovely little tooltip movieclip that follows the user's mouse for a few seconds before it removes itself. My problem is that if there is one already there I remove it, however, I cannot seem to remove the MOTION_FINISH event and it still fires and possibly deletes a new tooltip.
What I want is to essentially put in a line item such as var tween(smallhelp_panel).deleteAll();
I saw a tweenlight function killtweensof(mc); However I've used the tweens I've incorporated below throughout my 30k lines of AS3 code.
Here is my tooltip handler. I call it with a simple
Main_Warning("Please don't forget to save!",5);
My movieclip is a 'smallhelp_panel' and I check if it already exists and remove it. However, the alpha and MOTION_FINISH tweens still exist and cause issues with any new smallhelp_panels.
public function Main_Warning( the_text:String, myTimer:int = 4){
if(smallhelp_panel != null){
stage.removeChild( smallhelp_panel );
removeEventListener(Event.ENTER_FRAME, trackmouse);
smallhelp_panel = null;
}
smallhelp_panel = new small_help();
smallhelp_panel.name = "myWarning";
smallhelp_panel.x = mouseX - 50;
smallhelp_panel.y = mouseY + 15;
smallhelp_panel.helptext.text = the_text;
stage.addChild( smallhelp_panel );
addEventListener(Event.ENTER_FRAME, trackmouse);
var myTween:Tween;
myTween = new Tween(smallhelp_panel, "alpha", None.easeOut, 1, 0, myTimer, true);
tweenholder = myTween;
tweenArray.push(tweenholder);
myTween.addEventListener(TweenEvent.MOTION_FINISH, removeTween);
}
That is my Tooltip handler.
for reference purposes my tween remover is:
public function removeTween(e:TweenEvent = null):void{
e.target.removeEventListener(TweenEvent.MOTION_FINISH, removeTween);
if(smallhelp_panel != null){
removeEventListener(Event.ENTER_FRAME, trackmouse);
stage.removeChild( smallhelp_panel );
smallhelp_panel = null;
}
}
and my mouse tracker that moves the tooltip with the mouse is a simple:
public function trackmouse(e:Event):void{
smallhelp_panel.x = mouseX - 50;
smallhelp_panel.y = mouseY + 15;
}
That's because you've added your MOTION_FINISH event listener to the tween, not to the panel. You remove the panel, if one already exists, but the tween still exists in the tweenholder and tweenArray variables - and fires a MOTION_FINISH event, when its calculations are finished. Your event listener method doesn't know which tween the event came from, and correctly removes the help panel.
To fix this, either remove the tween and event listener along with the help panel in your Main_Warning function, or modify the removal block in your event listener method:
public function removeTween(e:TweenEvent = null):void{
e.target.removeEventListener(TweenEvent.MOTION_FINISH, removeTween);
// --- this will check if the Tween belongs to the panel on the stage!
if (smallhelp_panel && e.target.obj == smallhelp_panel ) {
// ---
removeEventListener(Event.ENTER_FRAME, trackmouse);
stage.removeChild( smallhelp_panel );
smallhelp_panel = null;
}
// --- NOW remove the tween from the array (all of them should be removed after use)
tweenArray.splice (tweenArray.indexOf (e.target), 1);
}
I don't understand exactly why you would need both a tweenholder and a tweenArray variable, though ;)
Your TweenEvent is still being listened for. You never remove the previous listener, so it will fire when the tween calculations are complete.
I assume tweenholder is declared somewhere global? (Like the other answer here, I'm confused as to your need of declaring a new tween, storing it in another reference and adding that reference to an array...) If so, try this:
public function Main_Warning( the_text:String, myTimer:int = 4){
tweenholder.removeEventListener(TweenEvent.MOTION_FINISH,removeTween);
if(smallhelp_panel != null){
...