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Easing the text with the ScrollBar

From: Flash CS3 Professional Beyond the Basics

Video: Easing the text with the ScrollBar

No that our scrollbar is connected to the text field, we'll add some easing to the animation of the text field. If you're following along, I'm working in 06_Bar_Easing.fla in the chapter 04 folder in the Exercise Files folder. Let's select the first keyframe of the actions layer and open to the Actions panel by pressing Option+F9 on the Mac or F9 on the PC. Scroll up to the top of your code and below the target scroll variable, create another variable called easing. Data type will be a number, and we'll give it a value of 5.

Easing the text with the ScrollBar

No that our scrollbar is connected to the text field, we'll add some easing to the animation of the text field. If you're following along, I'm working in 06_Bar_Easing.fla in the chapter 04 folder in the Exercise Files folder. Let's select the first keyframe of the actions layer and open to the Actions panel by pressing Option+F9 on the Mac or F9 on the PC. Scroll up to the top of your code and below the target scroll variable, create another variable called easing. Data type will be a number, and we'll give it a value of 5.

This number will control how much the animation speeds up and slows down. We'll talk more about how this value works later on, but it's a value that you can modify a little bit, in order to have a little bit more control over your animation of your text field. Let's scroll down to the setScrollPercent function. We're going to modify our code just a little bit. Find the line of code where we set the y position of text_mc. The first thing we'll do is add a minus sign right before the equal sign and then we'll wrap targetScroll in parentheses. Right before targetScroll type text_mc.y - The value in parentheses here represents the distance from where the text movie clip is currently, from where the text movie clip wants to scroll to.

What we're going to do is divide this value, so after the parentheses type space / space and then type easing. What this block of code does is instead of moving the text field directly to where it wants to go, the text field will move a portion of the distance from where it wants to go. Here's how that works. First we had a minus equals instead of simply the equals. That code subtracts a value from the text field's current y value. The value that's subtracted is the distance between where the text field is and where it wants to go, divided by easing, which currently is five.

So every frame the text field will move a fifth of the distance to where it wants to go. For example, if the text field is 100 pixels away from where it wants to go, it will move 20 pixels for the first frame. Then the text field will be 80 pixels from where it wants to go. At that point the text field will then move 16 pixels, because that's one fifth of the distance that the text field would be. So each frame, the text field is going to move closer and closer to it's target, but at the same time each frame the text field is going to move a little bit less distance and so we get this effect that the text field is slowing down as it animates.

Let's test the movie and see this in action. Press Command+Return on the Mac or Ctrl+Enter on the PC, to test the movie. Click and drag the scrollbar and watch the text field animate. Notice that it slows down until it gets to the right spot. But I want you to notice one really important thing. If you drag the scrollbar up and release your mouse button before the scrollbar finishes animating, then the text field will just stop. Now we don't want that to happen. We want the text field to always have an easing animation or at least have an easing animation wherever we can control it.

The reason why the text field stops animating when we release the mouse button, is because we removed the interframe event listener. Let's close this window and scroll up in our code. Find the stop dragging function, mine is from line 30 to line 34. At the bottom of that function you'll see stage.removeEventListener(Event.ENTER_FRAME); remember that we wrote this line of code, because I mentioned that it's a best practice to always remove event listeners, especially interframe event listeners, because they can slow down the playback of your Flash movie. When we add this easing effect, we want the text field to still animate when we release the mouse button.

What we're going to do is move this code into another place. But we're not going to do that in this movie. What I'm going to do is put // right before this code to disable it temporarily. Later on in this chapter we'll cut-and-paste this code into the proper place, so that we'll still remove the event listener, but we'll be able to have smooth easing animation. Let's test the movie now and see this in action. Command+Return on the Mac, Ctrl+Enter on the PC. Now when you move the scrollbar up and down you should be able to release your mouse away from the scrollbar and watch the animation continue.

And so that looks like it's working great and I'm going to close the Preview window. And now we've added easing to the animation of our text field.

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This video is part of

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Flash CS3 Professional Beyond the Basics

79 video lessons · 25609 viewers

Todd Perkins
Author

 
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  1. 3m 30s
    1. Welcome
      1m 20s
    2. Getting the most from this training
      1m 20s
    3. Using the exercise files
      50s
  2. 15m 28s
    1. Managing digital assets
      4m 9s
    2. Creating custom keyboard shortcuts
      5m 1s
    3. Creating custom color swatches
      3m 41s
    4. Creating a custom template
      2m 37s
  3. 14m 38s
    1. Working with variables
      3m 41s
    2. Using functions
      3m 30s
    3. Working with events
      2m 11s
    4. Using event listeners
      2m 42s
    5. Working with arrays
      2m 34s
  4. 29m 41s
    1. Understanding dynamic text fields
      2m 37s
    2. Loading text from an external file
      6m 42s
    3. Reading HTML from a text field
      5m 29s
    4. Applying CSS with ActionScript
      7m 0s
    5. Applying external CSS to a text field
      7m 53s
  5. 45m 27s
    1. Masking dynamic text
      4m 59s
    2. Dragging the Scroll Bar
      7m 3s
    3. Calculating a scroll percent
      5m 20s
    4. Setting scroll boundaries
      4m 9s
    5. Connecting the ScrollBar to the text field
      2m 55s
    6. Easing the text with the ScrollBar
      4m 12s
    7. Scrolling the text with buttons
      2m 38s
    8. Animating the scrolling text with the buttons
      4m 26s
    9. Setting boundaries for the scrolling text
      4m 26s
    10. Easing the text using the buttons
      1m 37s
    11. Connecting the ScrollBar to the Scroll buttons
      3m 42s
  6. 20m 46s
    1. Organizing a complex object into layers
      1m 51s
    2. Duplicating MovieClips
      1m 29s
    3. Undocking the timeline
      1m 20s
    4. Animating a complex MovieClip
      4m 36s
    5. Creating an animated Hinge effect
      5m 13s
    6. Creating complex animations
      6m 17s
  7. 28m 1s
    1. Controlling objects with buttons
      4m 6s
    2. Understanding frame labels
      3m 25s
    3. Using buttons to navigate labeled frames
      2m 30s
    4. Nesting code within MovieClips
      5m 8s
    5. Adding sound to the application
      2m 34s
    6. Adding drag interactivity to the robot
      6m 1s
    7. Animating the dragged robot
      4m 17s
  8. 20m 3s
    1. Understanding components
      2m 30s
    2. Using components to setup a form
      3m 45s
    3. Setting up the form to send an email
      3m 38s
    4. Working with form variables
      6m 11s
    5. Skinning components
      3m 59s
  9. 27m 40s
    1. Using transparency in a video
      4m 16s
    2. Working with embedded video
      3m 38s
    3. Animating a VideoClip
      2m 53s
    4. Creating an advanced animation with video
      2m 40s
    5. Working with the bitmap data class
      3m 37s
    6. Working with the bitmap class
      1m 40s
    7. Copying the video to create a reflection
      1m 35s
    8. Reflecting the video
      2m 42s
    9. Enhancing a video reflection with a mask
      4m 39s
  10. 1h 38m
    1. Viewing the finished MP3 player
      1m 45s
    2. Understanding the project flow
      2m 52s
    3. Preparing to build the MP3 player
      5m 11s
    4. Understanding classes and packages
      5m 32s
    5. Creating the MP3 player class
      9m 59s
    6. Loading sounds from external files
      9m 20s
    7. Accessing ID3 tag information
      6m 11s
    8. Controlling sound playback with Play and Pause buttons
      11m 3s
    9. Changing tracks
      12m 1s
    10. Displaying the current volume
      9m 33s
    11. Changing the volume
      6m 40s
    12. Wiring the progress bar
      8m 4s
    13. Building the progress bar slider
      10m 4s
  11. 5m 36s
    1. Making Flash movies accessible
      1m 49s
    2. Adding a name and description to your Flash movie
      52s
    3. Accessibility and text fields
      2m 55s
  12. 12m 2s
    1. Understanding Flash Mobile
      35s
    2. Exploring Device Central
      1m 45s
    3. Updating Device Profiles
      1m 7s
    4. Creating a Flash file from Device Central
      2m 7s
    5. Creating and testing Flash Lite applications
      2m 48s
    6. Downloading the Flash Lite player for Windows Mobile
      1m 44s
    7. Getting a Flash Lite application onto your phone
      1m 56s
  13. 27s
    1. Goodbye
      27s

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