You are probably wondering what a "multi-state icon" is. A multi-state icon is a visual that contains multiple variants of itself. Depending on the situation, a different variant or state can display.
For example, below is a multi-state icon that displays a checkmark or a cancel image depending on whether a feature is supported or unsupported:
From an implementation point of view, a multi-state icon is a movie clip that contains a frame for each of the states you wish to support:
To display an icon, you call an instance of this movie clip use code to take you to the appropriate frame where the icon you wish to display resides.
In this short tutorial, you will learn how to create your multi-state icon movie clip and generate the code needed to switch between each of the frames. Let's get started!
Creating the Movie Clip
The first thing we'll do is create the movie clip that contains the icons we wish to display
Launch any version of Flash that supports ActionScript 3 based projects. I will be using Flash CS5.5, but the instructions should be similar on older versions as well.
- First, create a new ActionScript 3 project:
[ create a new AS3-based project ]
After you have created your project, you will see a blank design surface where you can start to create things. We won't do anything here...just yet.
- Go to Insert | New Symbol to bring up the Create New Symbol dialog:
[ this dialog allows you to create...symbols! ]
- In the Create New Symbol dialog, find the Name field and replace
Symbol 1 with YesNoCancel. This will become the
name of your movie clip. Once you you have entered that name, press OK to
close this dialog and create your new symbol.
- Right now, you will be inside your YesNoWarning movie clip that
you created just a few seconds ago. It is here where we you will start
populating the various frames that will make up the states of our icon.
Let's start with Frame 1. Copy the following icon image and paste it on your design surface:
Your design surface should look as follows:
[ the icon has landed ]
Frame 1 is now done, and you have just created the first state of your multi-state icon!
- Let's add the next state. Because each state corresponds to a frame, we need to insert a new frame for the new icon we wish to display. In your timeline, right click on Frame 2 and select Insert Blank Keyframe.
Your timeline should look as follows:
[ a blank keyframe will appear in Frame 2 ]
Notice that when your blank keyframe on Frame 2 is selected, your design surface is empty because there is nothing to show. Let's change that.
- With the blank keyframe on Frame 2 selected, copy the following icon and paste it on your design surface:
Once you have pasted the icon, your design surface will now show it:
[ your second icon now appears ]
- You now have two frames filled out. All that remains is the third frame corresponding to a third state. In your timeline, insert a blank keyframe on Frame 3 and copy/paste the following image into your design surface:
Right now, you should have three solid keyframes in your Timeline with each keyframe displaying a different icon:
[ you should see three solid keyframes ]
- We are almost done with the movie clip! Let's make
sure the icons display properly.
Scrub through your timeline by dragging the red timeline marker back and forth between Frame 1 and Frame 3. While you are scrubbing, make sure your icons are displaying in the same location and not jumping a few pixels each frame.
To ensure that there are no jumps, you can make sure the X and Y position of each icon on the design surface is 0,0:
[ make sure your icons' position is 0, 0 ]
- Right now, the frames in your movie clip will play in
a continuous loop because...well, that is what frames in a movie
clip do. The way you stop the frames from playing is by adding a
stop() action to the first frame.
Right click on your first keyframe on the timeline and select Actions. The Actions code editor will appear. Add the stop() function in the code editor:
[ add the stop function in your code editor ]
After you have done this, Frame 1 of your timeline will even indicate that an action is applied by showing the letter a:
[ the a letter indicates that this frame has some code ]
- You are now done with working in the movie clip. Let's go back to the main stage by clicking on the Scene 1 tab in the breadcrumb bar:
[ let's go scope out and return to Scene 1 ]
You should be back to your main stage...which is completely empty. Let's change that next.
Using the Multi-State Icon
To use the multi-state icon, first display your Library by pressing Ctrl + L or by going to Window | Library:
[ all of your assets will be displayed ]
You will see your YesNoWarning movie clip listed. Select the movie clip and drag/drop it onto your design surface. An instance of this movie clip will now be created for you.
We need to refer to this movie clip via code, and we can't do that unless this movie clip has an instance name. Let's fix that next. Select your YesNoWarning movie clip, look in the Properties panel, and give your movie clip the instance name supportedStatus:
[ your movie clip now has an instance name! ]
With your movie clip named, you can now refer to it easily using code! In your timeline, right-click on the first (and only keyframe) and select Actions. The Actions dialog will appear again.
Type or copy/paste the following into it:
When you run your application, you will see the cross icon displayed:
[ Frame 2 is now active! ]
The reason is because the gotoAndStop function takes the frame number of the movie clip you are calling it on as an argument. Depending on the frame number you pass to it, it goes to and stops at that specified frame.
In our case, the frame number 2 was specified as the argument to our gotoAndStop function, and that frame number corresponds to the cross icon. You can pass in either a 1 or a 3 to get the checkmark and warning icon respectively. Wohoo - and now you are done!
You can see a practical application of this in the Detecting What is Supported tutorial where I use a variant of this multi-state icon.
That's all there is to it. In this tutorial you learned a little bit about how to reconcile the world of the timeline with ActionScript to create something quite interesting...such as a multi-state icon.
If you have questions, need some assistance on this topic, or just want to chat - post in the comments below or drop by our friendly forums (where you have a lot more formatting options) and post your question. There are a lot of knowledgeable and witty people who would be happy to help you out
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