Macromedia Studio 8 [Electronic resources] : Training from the Source نسخه متنی

Programming the Down Button

In this task, you'll program the button that enables users to access the lower half of the Inferno map. You'll use a script much like the ones you learned to create in Lesson 8, Creating Animation and Interactivity. As you program the button this time, keep the preceding discussion in mind.

This file is already partially built, with the graphics in place to enable you to focus on the architectural and scripting aspects of the movie.

This button was created for you in advance. Its purpose is to enable the user to access Lower Hell. Currently, it lacks an instance name, and no script has been written to do anything with the button.

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The instance name exposes the button to ActionScript.

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The panel currently has only a stop() action.

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// Powers the Down button
down_btn.onRelease = function() {
gotoAndStop("lower");
};

The ActionScript tells Flash that whenever a user clicks the down_btn instance, the timeline should skip to the frame label called "lower." onRelease is an event handler that's built into all button instances. gotoAndStop() is a method that's built into all timelines.

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Lower Hell has an up-pointing button that returns the user to Upper Hell. This button has already been programmed, so you should be able to go back and forth.