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Swing defines two types of containers The first are top-level containers: JFrame, JApplet, JWindow, and JDialog These containers do not inherit JComponent They do, however, inherit the AWT classes Component and Container Unlike Swing s other components, which are lightweight, the top-level containers are heavyweight This makes the top-level containers a special case in the Swing component library As the name implies, a top-level container must be at top of a containment hierarchy A top-level container is not contained within any other container Furthermore, every containment hierarchy must begin with a top-level container The one most commonly used for applications is JFrame The one used for applets is JApplet The second type of containers supported by Swing are lightweight containers Lightweight containers do inherit JComponent Examples of lightweight containers are JPanel, JScrollPane, and JRootPane Lightweight containers are often used to collectively organize and manage groups of related components because a lightweight container can be
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contained within another container Thus, you can use lightweight containers to create subgroups of related controls that are contained within an outer container
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The Top-Level Container Panes
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Each top-level container defines a set of panes At the top of the hierarchy is an instance of JRootPane JRootPane is a lightweight container whose purpose is to manage the other panes It also helps manage the optional menu bar The panes that comprise the root pane are called the glass pane, the content pane, and the layered pane The glass pane is the top-level pane It sits above and completely covers all other panes The glass pane enables you to manage mouse events that affect the entire container (rather than an individual control) or to paint over any other component, for example In most cases, you won t need to use the glass pane directly The layered pane allows components to be given a depth value This value determines which component overlays another (Thus, the layered pane lets you specify a Z-order for a component, although this is not something that you will usually need to do) The layered pane holds the content pane and the (optional) menu bar Although the glass pane and the layered pane are integral to the operation of a top-level container and serve important purposes, much of what they provide occurs behind the scene The pane with which your application will interact the most is the content pane, because this is the pane to which you will add visual components In other words, when you add a component, such as a button, to a top-level container, you will add it to the content pane Therefore, the content pane holds the components that the user interacts with By default, the content pane is an opaque instance of JPanel (which is one of Swing s lightweight containers)
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Layout Manager Overview
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In Java, the positioning of components within a container is controlled by a layout manager Java offers several layout managers Many are provided by the AWT (within javaawt), but Swing adds a few of its own in javaxswing All layout managers are instances of a class that implements the LayoutManager interface (Some will also implement the LayoutManager2 interface) Here is a list of the layout managers used in the examples in this chapter:
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javaawtFlowLayout A simple layout that positions components left-to-right, top-tobottom (Positions components right-to-left for some cultural settings) Positions components within the center or the borders of the container This is the default layout for a content pane Lays out components within a grid Lays out components vertically or horizontally within a box
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javaawtBorderLayout javaawtGridLayout javaxswingBoxLayout
It is beyond the scope of this chapter to describe these layout managers in detail, but the following discussions present a brief overview (Additional information about these layout managers is also found in the recipes)
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