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Animating the scrolling text with the buttons

From: Flash CS3 Professional Beyond the Basics

Video: Animating the scrolling text with the buttons

Now we'll use the buttons to animate the scrolling text. If you're following along, I'm working in 08_Animating_Button.fla in the Chapter 04 folder in the Exercise Files folder. Let's select the first keyframe of the actions layer and open the Actions panel by pressing Option+F9 on the Mac or F9 on the PC. Scroll all the way up to the top of your code and we'll create a new variable. I'm going to create the new variable on line 10 right below our scrollAmount variable. We'll call this variable scrollDirection with a capital D. The data type will be number and we'll give it an initial value of 0.

Animating the scrolling text with the buttons

Now we'll use the buttons to animate the scrolling text. If you're following along, I'm working in 08_Animating_Button.fla in the Chapter 04 folder in the Exercise Files folder. Let's select the first keyframe of the actions layer and open the Actions panel by pressing Option+F9 on the Mac or F9 on the PC. Scroll all the way up to the top of your code and we'll create a new variable. I'm going to create the new variable on line 10 right below our scrollAmount variable. We'll call this variable scrollDirection with a capital D. The data type will be number and we'll give it an initial value of 0.

This variable will represent the direction and amount that the text is scrolling. Let's scroll down to the setDirection function. Mine is on line 63 to line 67. What I'm going to do is select the text_mc.y += dir; line of code. I'm going to replace it with scrollDirection = dir; That way we can capture the current scroll direction. We'll use that direction later on this exercise to animate the movement of the scrolling text.

On the next line add an event listener to the stage. And the event will be event.ENTER_FRAME and the function we'll run is called the scrollText, capital T. This is the function that'll animate our scrolling text. And we'll define that in just a minute. On the next line, add one more event listener to stage and the event listener is going to be MouseEvent.MOUSE_UP. It's all caps, and the function we'll run will be called stopScrolling.

We'll also define this function later in this exercise. Now let's define the scrollText function. We'll do that right below the setDirection function. So below the setDirection function, create a function called scrollText. Remember it's going to receive an event with the data type of event. It's not going to return a value, so I'll type void for the return data type and then inside of the scrollText function type targetScroll, with a capital S, += scrollDirection; If you remember from when we set the targetScroll value, when we scrolled the text with a scrollbar, targetScroll holds the value of where the text field is going to end up.

So here we're just connecting the value of the targetScroll to our scroll direction variable. On the next line, type text_mc.y = targetScroll. Next we'll define the stop scrolling function. Defining the stop scrolling function will make sure that the text does not move forever once we start scrolling it. What we'll do in the stop scrolling function is set the scroll direction to zero. So let's create the stop scrolling function. Remember it'll receive an event with the data type of mouse event.

And inside of the stopScrolling function we'll simply set the scroll direction to 0. And that will stop updating the target scroll value, which will make the text stop animating. Notice that we're not removing the event listener from the stage for the scroll text event. Because not only do we want to set the scroll direction to 0 in the stopScrolling function, but we also want to stop the scroll text function from running at some point. The point where we'll do that is whenever the user clicks on the scrollbar. So let's scroll up in our code to the very bottom of the dragScroller function.

Mine goes from line 20 to line 30. Let's remove the event listener to scroll the text. Later on we're going to add easing to our scroll buttons, so we want the enter frame event to continue scrolling the text. We'll turn off that enter frame event inside of the dragScroller function. So at the very bottom of the dragScroller function type stage.removeEventListener and the event is going to be Event.ENTER_FRAME, all caps, and the name of the function is scrollText with a capital T.

So dragging the scrollbar stops the scrollText function from running, and clicking on the buttons stops the setScrollPercent function from running. Let's test the movie and see this in action. Command+Return on the Mac, Ctrl+Enter on the PC. Click and hold your mouse down on the buttons to scroll the text. Notice that the text scrolls past where it should. We'll fix that in the next movie. So there's a look at animating the scroll text field using buttons.

Show transcript

This video is part of

Image for Flash CS3 Professional Beyond the Basics
Flash CS3 Professional Beyond the Basics

79 video lessons · 25600 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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