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Setting boundaries for the scrolling text

From: Flash CS3 Professional Beyond the Basics

Video: Setting boundaries for the scrolling text

Now we'll talk about setting the boundaries for our text field when we're animating using our buttons. If you're following, along, I'm working in 09_Button_Boundaries.fla in the Chapter 04 folder in the Exercise Files folder. Let's select the first keyframe of the actions layer and open up the Actions panel by pressing Option+F9 on the Mac or F9 on the PC. In your code find the scroll text function. In my code it goes from line 72 to line 76. At the very bottom this function we'll create a conditional statement to see if the text field is moved out of bounds.

Setting boundaries for the scrolling text

Now we'll talk about setting the boundaries for our text field when we're animating using our buttons. If you're following, along, I'm working in 09_Button_Boundaries.fla in the Chapter 04 folder in the Exercise Files folder. Let's select the first keyframe of the actions layer and open up the Actions panel by pressing Option+F9 on the Mac or F9 on the PC. In your code find the scroll text function. In my code it goes from line 72 to line 76. At the very bottom this function we'll create a conditional statement to see if the text field is moved out of bounds.

Type in text_mc.y > minScroll and then in the curly braces for that conditional statement, type text_mc.y = minScroll; So if the text field moves past or moves below the minScroll value, then we set the text field's y property to be equal to the minScroll value. Below this conditional statement, create another conditional statement, but this time instead of an if statement, make it an else if statement.

Then we'll check to see if the text field is moved out of bounds the other way. So type else if, and in parentheses text_mc.y < maxScroll, capital S. In the curly braces below that condition we'll set the value of text_mc.y = maxScroll; And the code that we just wrote essentially makes the text field stay in bounds, so the text field won't go below minScroll or above maxScroll.

Let's test the movie and see this in action, Command+Return on the Mac, Ctrl+Enter on the PC. Now when we test the movie we're going to run into a problem. What I want you to do is hold the down arrow, click and hold your mouse down on the down arrow, until the text field scrolls down and wait a second or two, then release the mouse button. Now click the up arrow, hold your mouse down for a few seconds. The text field starts moving. Now why is that problem happening? Let's close this Preview window and talk about it. I neglected to write a few lines of code here on purpose. So then we can get practice troubleshooting a problem.

First let's talk about the possible reasons for this problem happening. Now we know that the text field is stopping at the right points, but we want to scroll the text field again. If we held our mouse down a little bit longer on one of the buttons, the text field takes it that much time to scroll again. So to find that out we ask ourselves this question - What's making the text field scroll or where is the text field getting its scroll value from? On line 75 in my code, the second line inside of this function, the text field's y position is coming from the targetScroll variable.

The targetScroll variable is being set by the scrollDirection variable. So the problem that's happening is that when we hold our mouse down on the down button, this targetScroll variable is increasing more and more. And then when we put our mouse on the up arrow button. So this targetScroll value is constantly increasing, so what we need to do is reset this targetScroll value and then our buttons should work properly. Inside of the if statement that you created, right below text_mc.y = minScroll, type targetScroll = minScroll; and this will tell Flash that the targetScroll area is the minimum scroll position and even if it increases each frame because of the scroll direction, this if statement will reset that target scroll value each frame.

That way, the target scroll value will not constantly be increasing but rather will constantly be reset each frame. So inside of the else if statement, below the line of code that's already in there, type targetScroll = maxScroll; Now by resetting this targetScroll variable, the problem that we had before will go away. Let's test movie by pressing Command+Return on the Mac, or Ctrl+Enter on the PC. Click and hold your mouse down on the down arrow. Hold it down a little bit longer than you need to, then release your mouse button, and click on the up arrow and notice the text scrolls right away.

Hold your mouse down a little bit longer then you need to on the up arrow, and then click the down arrow, and it works great. Let's close this window, and there's a look at setting the boundaries for a text field when we're animating it using buttons.

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This video is part of

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

79 video lessons · 25618 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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