By Matthew Scarpino
Masking Eclipse's new power for development graphical person interfaces with model 3.0, the traditional Widget Toolkit (SWT) and JFace, this advisor demonstrates how those award-winning instruments have got huge aid for developing machine functions. idea and useful examples show how one can construct GUIs that mix the appear and feel of local interfaces with the platform independence of Java. This advisor additionally indicates how SWT uses the widgets supplied by means of the working process and describes how those parts could be linked to occasions, bins, and pics. With this data, programmers can construct absolutely featured consumer interfaces that speak without delay with the underlying platform. JFace's skill to simplify and manage the method of GUI layout is then verified, permitting builders to change and adapt elements, and separate their details from their appearance.
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Additional info for SWT JFace in Action, Manning
This modular structure promotes code reuse and enables one developer to design the window’s view while another determines its behavior. The appearance is controlled by the Composite configured in the createContents() method, and the operation is performed mainly through the instance of the ApplicationWindow class. Because this class is so crucial in SWT/JFace applications, it’s important to examine its function in greater detail. 4 The ApplicationWindow class Although we’ve just mentioned how the ApplicationWindow in HelloSWT_JFace differs from the Shell object in HelloSWT, both applications rely on Shell and Display objects to communicate with the operating system.
We can now go into further depth by showing how its main classes work. 1 Model-based adapters Eclipse documentation uses two terms to refer to JFace classes that work with SWT widgets: helper classes and model-based adapters. We’ve chosen to use the latter term in this book. This may be confusing because, in Java, an adapter is a class that provides additional event-handling capability to a widget. However, no self-respecting programmer will use helper classes, so we’ll call them model-based adapters, or JFace adapters.
Another important point to consider is that, if any features in your operating system aren’t incorporated into SWT, you can use the Java Native Interface to add them yourself. All it requires is a native Java method in the SWT package and a C function in the native graphics library that calls the operating system. 1 identifies and describes a number of methods that belong to the Display class. 1 Important methods of the Display class and their functions Display method Function Display() Allocates platform resources and creates a Display object getCurrent() Returns the user-interface thread readAndDispatch() Display object interprets events and passes them to receiver sleep() Display object waits for events The first two methods must be used in any SWT-based GUI.
SWT JFace in Action, Manning by Matthew Scarpino