September 2008
Intermediate to advanced
660 pages
20h 32m
English
Content preview from Programming Flex 3Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Drag-and-Drop
Drag-and-drop is one of the many features that set Flex applications apart from other types of applications. As you’ll see in the next few sections, it is extremely simple to enable drag-and-drop functionality for some standard components, and with a little additional work you can enable drag-and-drop functionality to any type of component.
Using Built-In Drag-and-Drop Features
The simplest way to implement drag-and-drop functionality is to use the built-in features of many of
the components, including List,
Tree, DataGrid, Menu, HorizontalList, PrintDataGrid, and TileList. Each of these components enables
drag-and-drop in the same way. They each have a dragEnabled property and a dropEnabled property. The two properties are false by default. When you set the dragEnabled property to true for a component, the user can click and
drag items. Of course, in most cases enabling a component so that a user
can click and drag an item is not very useful until the user can also
drop the item somewhere in the application. Typically, this is
accomplished by setting the dropEnabled property of another component to
true. When the dropEnabled property is set to true for a component, the user can drop an
item on the component that he dragged from another component. This
causes the data from that item to be added to the drop target component.
Example 10-7 illustrates both a
dragEnabled and a dropEnabled component working in conjunction. The first data grid contains data about the user’s ...
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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.