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Understanding classes and packages

From: Flash CS3 Professional Beyond the Basics

Video: Understanding classes and packages

Now we'll talk a little bit about classes and packages and what classes we'll be working with. If you're following along find Chapter 9 in the Exercise Files folder and then the 04 folder, and inside of that folder expand the Start folder, and inside of the Start folder expand the Classes folder, expand the com folder, expand the lynda folder, expand the audio folder and expand the mp3 folder. After you've drilled down that many folders you have access to the ActionScript files that are we are working with in this chapter.

Understanding classes and packages

Now we'll talk a little bit about classes and packages and what classes we'll be working with. If you're following along find Chapter 9 in the Exercise Files folder and then the 04 folder, and inside of that folder expand the Start folder, and inside of the Start folder expand the Classes folder, expand the com folder, expand the lynda folder, expand the audio folder and expand the mp3 folder. After you've drilled down that many folders you have access to the ActionScript files that are we are working with in this chapter.

Let's take a look at what's inside of each of these files. I'm going to select the top file MP3Player.as, then I'm going to hold Shift on my keyboard and select the bottom file, which is VolumeControl.as. I'm going to drag all of those files over to Flash to open them in Flash. The first file I'm looking at is SoundLoader.as. So find that file and you can just see that it's pretty much a skeleton of a class file. So we have a package definition, and you may remember that a package is just a set of classes and the com.lynda.audio.mp3 is simply the path to where this file is located or the path to this package, the package being com.lynda.audio.mp3.

This package contains all the classes we'll be working with for our MP3 Player project. You can see inside of here, this is simply just the skeleton of a class with just a little bit more and that's just a few import statements. These are the classes that we'll be working with so I just put some import statements in here so if you're following along and don't have access to the Exercise Files you can simply create this SoundLoader.as file with the same code. If you have the same package name you need to also have the same folder structure.

That means the folder called com needs to contain a folder called lynda, which contains a folder called audio, which contains a folder called mp3, which contains this file, SoundLoader.as, as well as the other files that we'll be working with throughout this chapter. So I'm going to close SoundLoader.as. Now we'll take a look at SkipButtons.as. This is simply a class file with some classes imported so I'll close SkipButtons.as. We're going to find MP3 player is essentially the same thing. Several classes are imported and other than that is just a skeleton of a Class file. Same with VolumeControl, Same with the PlayPauseBupon, same with the ProgressSlider and so I close the ProgressSlider and that's a look at the class files we'll be working with. Now if you don't have access to the Exercise Files, and you didn't happen to copy all that code down don't worry we'll go back to those files and you'll be able to see that same code again so you can copy it down then.

So now that we've looked at our classes and talked about what packages are, let's connect our FLA file to those classes or to the com.lynda.audio.mp3 package. So make sure everything on the Stage is deselected and then in the bottom of the screen in the Property inspector I'm going to click the Publish Settings button and that opens up the Publish Settings window and inside of the Publish Settings window I'm going to choose the Flash tab and next to ActionScript version, ActionScript 3.0 I'm going to click the Settings button.

This is where you specify where the class files that you'll be working with are located. So as we looked at earlier in this movie, we have that folder called classes that contains all of our classes and contains that whole folder structure com.lynda.audio.mp3. So what we need do is link this Flash file to that classes folder. So what I'm going to do is click the Target button on the right side near the bottom of the ActionScript 3.0 Settings window, and that's actually the Browse to Path button, looks like a Target icon.

When you click that button Flash points you to select the path that contains the class definition .as files you wish to import. So what I'm going to do is in the Chapter 9 folder, in the Exercise Files folder I'm going to go to Chapter 04 folder and Start folder, I'm going to select the Classes folder. I'm not going to browse all the way down, com and then lynda and then audio and then mp3. I'm just going to choose classes. That's all that you need to choose, everything else we can do in ActionScript. So let's click the Choose button after you've selected that folder.

You can see the class path inside of the Classpath window, and once you've selected your classpath, just click OK and then click OK to exit the Publish Settings window. Now we've told Flash where our class files are stored. The next thing we want to do is import those classes, so we can use them in ActionScript. 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. Inside of the Actions panel, above all the other code that's previously written, type import. We're going to need to import all those classes. We're going to be doing it using that same Package structure or the Folder structure that was specified in each class.

So we're going to import the entire, com.lynda.audio.mp3 class. To do that we type com.lynda.audio.mp3 and then .*. That's the wild card that imports all the classes that we'll be working with to build our MP3 Player. And now all of our classes are ready and waiting for us to work with them.

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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 · 25621 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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