MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH - Dragging Movie Clips

Dragging movie clips 359
■ On the Macintosh, browse to Macintosh HD/Applications/Macromedia Flash 8/Samples
and Tutorials/Samples/ActionScript/Galleries.
Dragging movie clips
You can use the global startDrag() function or the MovieClip.startDrag() method to
make a movie clip draggable. For example, you can make a draggable movie clip for games,
drag-and-drop functions, customizable interfaces, scroll bars, and sliders.
A movie clip remains draggable until explicitly stopped by
stopDrag() or until another
movie clip is targeted with
startDrag(). Only one movie clip at a time can be dragged in a
SWF file.
To create more complicated drag-and-drop behavior, you can evaluate the
_droptarget
property of the movie clip being dragged. For example, you might examine the
_droptarget
property to see if the movie clip was dragged onto a specific movie clip (such as a “trash can”
movie clip) and then trigger another action, as shown in the following example:
// Drag a piece of garbage.
garbage_mc.onPress = function() {
this.startDrag(false);
};
// When the garbage is dragged over the trashcan, make it invisible.
garbage_mc.onRelease = function() {
this.stopDrag();
// Convert the slash notation to dot notation using eval.
if (eval(this._droptarget) == trashcan_mc) {
garbage_mc._visible = false;
}
};
For more information, see startDrag function or startDrag
(
MovieClip.startDrag method) in the ActionScript 2.0 Language Reference.
You can a sample photo gallery application on your hard disk.This file provides an example of
how to use ActionScript to control movie clips dynamically while loading image files into a
SWF file, which includes making each movie clip draggable. You can find the sample source
file, gallery_tween.fla, in the Samples folder on your hard disk.
■ In Windows, browse to boot drive\Program Files\Macromedia\Flash 8\Samples and
Tutorials\Samples\ActionScript\Galleries.
■ On the Macintosh, browse to Macintosh HD/Applications/Macromedia Flash 8/Samples
and Tutorials/Samples/ActionScript/Galleries.