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QuigleyMcCormick
QuigleyMcCormick
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How do you create a fast forward and rewind button?

May 29, 2012 10:15 PM

Tags: #fast_forward #rewind

I would like to create a simple fast forward and rewind button. I am getting sporadic results with the rewind button. I would like the playhead to skip 3 seconds (72 frames) at a time when the user hits the fast forward or rewind button. They should be able to hit either buttons repeatedly. If  playhead is  under 3 seconds then it will go to the first frame.

 

Here's the code:

 

var FrameNumRewind:Number = this.currentFrame;

FrameNumRewind = 0

 

stage.addEventListener(MouseEvent.MOUSE_DOWN, page_watch);

function page_watch(event:MouseEvent):void

{

if (event.target == bnt_Fast)

    {

    var FrameNumFast:Number = this.currentFrame;

    this.gotoAndPlay(FrameNumFast +=72);

    }

 

    if (event.target == bnt_Rewind)

    {

       //Will take the frame head to the first frame if less than 73 frames.

       if(FrameNumRewind <=73)

        {

        SoundMixer.stopAll();

        this.gotoAndPlay("1");}

        }

       

        else

        {

        this.gotoAndPlay(FrameNumRewind-=72);

        }

 

    }

 

What am I doing wrong? Is there a better way to do this?

I would appreaciate any help or any references.

1018 Views   5 Replies   Latest reply: Ned Murphy, May 30, 2012 12:36 PM
 
Replies
  • Ned Murphy
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    1. Ned Murphy,
    May 30, 2012 4:28 AM   in reply to QuigleyMcCormick
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    You do not need to be using the two "Frame..." variables.  You can use the currentFrame property instead.  When you use specify  this.gotoAndPlay("1");  you do not use quotation marks because the argument is a numeric value, not a string.  You should assign the listeners to the buttons instead of the stage.  Let each have its own event handler function.  When you press down on the button assign an ENTER_FRAME listener to call a function for changing the frames, and when you release it, remove that ENTER_FRAME listener.

     
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  • QuigleyMcCormick
    Currently Being Moderated
    2. QuigleyMcCormick,
    May 30, 2012 10:05 AM   in reply to Ned Murphy
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    Ned,

     

    Thanks for your response. But I am a bit confused by your response. Below is my interpretation of your response. There are still errors though but I don't know how to solve them. I only tested this for the fast foward button.

     

    bnt_Fast.addEventListener(MouseEvent.MOUSE_DOWN, fastForwarda);

    function fastForwarda (event:MouseEvent):void

    {

        stage.addEventListener(Event.ENTER_FRAME, ff72);

        function ff72 (event:Event):void

        {

        this.gotoAndPlay(this.currentFrame +=72);

        }

     

    }

     

    bnt_Fast.addEventListener(MouseEvent.MOUSE_UP, fastForwardb);

    function fastForwardb (event:MouseEvent):void

    {

        stage.removeEventListener(Event.ENTER_FRAME, ff72);

    }

     

    What am I doing wrong?

     
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  • Ned Murphy
    Currently Being Moderated
    3. Ned Murphy,
    May 30, 2012 10:25 AM   in reply to QuigleyMcCormick
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    One thing you should take care of is that you should not nest named functions within other functions.  Pull that ff72 function out by itself.

     

    The currentFrame property is a read-only property, but you are trying to change its value using code in this line...

     

        this.gotoAndPlay(this.currentFrame +=72);

     

    So change that line to be

     

       gotoAndPlay(currentFrame+72);

     

    noticing that I took the "this." references out as well.  They are more often unnecessary in AS3 scenarios.

     
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  • QuigleyMcCormick
    Currently Being Moderated
    4. QuigleyMcCormick,
    May 30, 2012 12:04 PM   in reply to Ned Murphy
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    Thanks Ned, it worked!

     

    I also added a feature that will prevent the playhead from going to another scene if the current frame is <= 72 ( the number of frames it rewinds).

     

     

    Here's the code for anyone's reference.

    //Fastforward button code.

    bnt_Fast.addEventListener(MouseEvent.MOUSE_DOWN, fastForwarda);

    function fastForwarda(event:MouseEvent):void

    {

        stage.addEventListener(Event.ENTER_FRAME, ff72);

    }

    function ff72(event:Event):void

    {

        gotoAndPlay(currentFrame+72);

        if (watchSound_RayJayShort.play())

        {

            SoundMixer.stopAll();

        }

    }

     

    bnt_Fast.addEventListener(MouseEvent.MOUSE_UP, fastForwardb);

    function fastForwardb(event:MouseEvent):void

    {

        stage.removeEventListener(Event.ENTER_FRAME, ff72);

    }

     

     

    //Rewind button code.

    bnt_Rewind.addEventListener(MouseEvent.MOUSE_DOWN, rewinda);

    function rewinda(event:MouseEvent):void

    {

        stage.addEventListener(Event.ENTER_FRAME, r72);

    }

     

    function r72(event:Event):void

    {

        if (watchSound_RayJayShort.play())

        {

            SoundMixer.stopAll();

        }

        if (currentFrame <=72)

        {

            gotoAndPlay(1);

        }

        else

        {

            gotoAndPlay(currentFrame-72);

        }

    }

     

    bnt_Rewind.addEventListener(MouseEvent.MOUSE_UP, rewindb);

    function rewindb(event:MouseEvent):void

    {

        stage.removeEventListener(Event.ENTER_FRAME, r72);

    }

     
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  • Ned Murphy
    Currently Being Moderated
    5. Ned Murphy,
    May 30, 2012 12:36 PM   in reply to QuigleyMcCormick
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    You're welcome

     
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