The Design Patterns Java Companion - download pdf or read online

By James W. Cooper

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The JFC actually uses a few common design patterns, and we will be using the JFC for most of the examples in this book. Thus, we are taking a short detour to outline how the JFC components work before going on to more patterns. We should note at the outset, that this package was called “Swing” during development and it was intended that it be referred to as “JFC” upon release. jar. com site and install them by simply unzipping the downloaded file. It is important that your CLASSPATH variable contain the paths for these three jar files.

The 60 buttons you add to the toolbar are just small JButtons with picture icons and without text. The JToolBar class has two important methods: add and addSeparator. addSeparator(); By default, JButtons have a rectangular shape, and to make the usual square-looking buttons, you need to use square icons and set the Insets of the button to zero. On most toolbars, the icons are 25 x 25 pixels. We thus develop the simple ToolButton class below, which handles both the insets and the size: public class ToolButton extends JButton { public ToolButton(Icon img) { super(img); setMargin(new Insets(0,0,0,0)); setSize(25,25); } } The JToolBar also has the characteristic that you can detach it from its anchored position along the top side of the program and attach it to another side, or leave it floating.

Add(Flat); If you neglect to add the radio buttons to a ButtonGroup, you can have several of them turned on at once. It is he ButtonGroup that assures that only one at a time can be turned on. The ButtonGroup object thus keeps track of the state of all the radio buttons in the group to enforce this only-one-on protocol. This is a clear example of the Mediator pattern we’ll be discussing in the chapters ahead. The JToolBar JToolBar is a container bar for tool buttons of the type you see in many programs.

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The Design Patterns Java Companion by James W. Cooper


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