Java 天地·Core Java·Lecture Notes·Unitt08-User interfaces, events and the AWT-Content 26 -- 追寻梦想＞编程乐园

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Complex layouts

Complex layouts in Java can usually be achieved by 'nesting' Panel objects within one another.

Note the following:

Panel objects are invisible, and exist only to contain other objects

Each Panel can have a different layout manager

Often some trial and error is required to achieve the desired effect

The example below shows how to achieve a more complex layout than is offered by the standard layout managers. It uses a two-layer structure. The overall layout is provided by a Panel with a border layout. The Panel has no 'real' (user-accessible) objects, but contains two other Panels. These in turn contain the objects that the user sees.

An alternative approach is to use the 'grid bag' layout.

User interface design tools are useful for designing complex layouts; they quickly show how the display will appear without compiling the program. This allows the programmer to make changes to the layout structure and see the effect immediately.

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