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Form had added functionality besides arranging componets on the screen, but it was interesting enough to mention here anyways.īy far the most powerful layout in Flex is absolute layout.
#Flowlayout vs grid java how to
Before I learned how to use GridBagLayout I wrote a layout manger very similar to this called a "ColumnPairLayout". If you add multiple components to a FormItem they stack vertically on the right hand side. It lines up a single column of label-component pairs. It ends up working a lot like a JList with horizontal wrap.įorm was interesting. Like FlowLayout it can "wrap" to a new row when it runs out of space. Like GridLayout all components have the same size. Tile is sort of like a cross between FlowLayout and GridLayout. There may just be a trick I do not know about. As a side note I was unable to get a component to actually span mltiple columns in the GUI editor. Components added to the Grid use their default size when placed but this can be overridden to a pixel amount or a percentage of the size of the cell in the Grid. A component can take up one or more rows or columns, much like GridBagLayout. The closest core Java layout to Flex's Grid is GridBagLayout. That something you can't do with BoxLayout, but can do with FlowLayout. It was nice to be able to specify the horizontal and vertical alignment of items inside the box.
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Items were given a reasonable default space and a reasonable default gap. There were no real surprises, items were arranged either horizontally or vertically. The HBox and VBox layouts work very much like BoxLayout or FlowLayout from Swing. For this article I'm going to stick to the Java definition and only include Flex Components who's only functionality is controlling the position of other components on the screen. I discovered that the Java definition of a layout is much more narrow then the Flex definition. It reminds me of the idea of anchoring a component in C#.Īfter my initial shock at absolute layout I investigated a number of other layouts available from the IDE. When the screen is resized the component gets bigger in order to keep the "constrained area" in the same place.
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So if I place a TextArea at 30,30 and give it a width of 100% then starting at the X value 30 it will expand and fill all remaining horizontal space.Īlso a component can be constrained or anchored a specific distance away from the edge of the screen. In absolute layout you can specify width and height in percentages of space left of the parent component. Actually absolute layout is more powerful then Null layout. This is akin to using Null layout in Java, which is considered bad practice. That means the x and y coordinates and the height and width or each component is saved in the MXML file. I quickly realised that by default the application area uses an absolute layout. simple? At first I sort of glided through the layout process, sticking controls all over the place. The first thing I did was throw some components on the screen and try to do some layout work. With that in mind I had high hopes for the Flex environment giving me something revolutionary to work with. I know a lot of people point to Flex as something Java should aspire to. At work I was asked to take a look at Flex.