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Flash 101 (part 5): Spiralling Out Of Control
Add interactivity to your Flash movies with built-in Flash Actions, and then use the new Flash Projector to distribute your movies to all and sundry.

| Mousing Around |

Next up, actions.

Actions allow you to add interactivity to a Flash movie, by executing specific commands in response to user actions. Flash comes with a full-featured scripting language, ActionScript, which is very similar to Javascript; you can either manually create scripts, or use Flash's built-in Actions panel to insert actions through a point-and-click mode of operation.

A number of pre-defined actions are available in Flash, which are more than sufficient for basic requirements; you've already seen one of them, the Get URL action, in last time's article. Typically, these actions are triggered in response to either a mouse or keyboard event, or when a specific frame is reached in the animation sequence.

When you specify an action for a button, Flash automatically inserts an onMouseEvent handler to it - this specifies whether the action is to be triggered when the mouse button is pressed or released, when the mouse pointer rolls over the button or when it rolls outside it, or when the user drags the pointer over the button. Additionally, you can specify an action to be triggered when the user taps a specific key on the keyboard.

Output image

For example, this code snippet specifies that the Flash player stop playing the animation sequence when the user releases the mouse button, or taps the X key on the keyboard.


on (release, keyPress "X") {
    stop ();
}


In a similar manner, you can assign actions to a movie clip - Flash automatically inserts an onClipEvent handler, which can trigger actions based on mouse movement, keyboard entry, or at specific positions in the clip.

Output image

Finally, you can also assign actions to a specific keyframe in the clip by right-clicking the frame and selecting the Actions command on the shortcut menu.

Note that you should use the Control -> Test Movie command to test whether or not your actions are working correctly.


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