July 2003
Intermediate to advanced
896 pages
45h 43m
English
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Creating the Components
Components are incredibly useful for developing well-constructed, object-oriented Flash applications. You should consider making elements of a movie into components when they meet either of these criteria:
The same elements, or similar elements, are used multiple times throughout a movie.
The element has complex behaviors and can be treated as a discrete unit.
For the image viewer/slideshow application, we will make seven components:
- Image
A component that loads images given a URL
- ImageViewPane
A component that allows an image to be moved and resized
- PreviewPane
A component into which image view panes are added
- SequenceViewer
The viewer for the full image slideshow sequence
- SequencerItem
One of the thumbnail items that can be added to the sequencer
- Sequencer
The component into which thumbnails are added and ordered
- Menu
The menu for the application
Designing the Image Element
The preview pane, sequencer, and sequence viewer all include elements that load images. Rather than reinvent the wheel with each, it makes sense to create a single Image component that can be utilized in each case. The Image component should have basic functionality that includes:
Loading an image from a given URL
Monitoring load progress with a progress bar
Invoking a callback function when loading is complete
Resizing itself to scale (maintaining the aspect ratio) to fit within specific dimensions
To create the Image component, complete the following steps:
Create a new movie clip symbol named
Image.Edit ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.