SWT History and Goals in Java

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SWT History and Goals
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this work to try and catch up, so having the two toolkits is actually good for users of both In the past, interoperability between the two toolkits was poor although this has improved dramatically in Eclipse 30 SWT is the foundation upon which the entire Eclipse user interface is based It is fast, native and multi-platform, but does not suffer the LCD problem present in AWT or the look-and-feel problem present in Swing It does this by taking a best-of-both-worlds approach it uses native widgets whenever possible on a platform and supplements them with emulated widgets on the platforms where they don t exist (a good example of this is the tree widget that exists in native form under Windows, but is emulated under Linux) The result is a rich, portable API for building GUI applications that adhere very closely the look-and-feel of each platform it supports
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Note: While providing a consistent high-level public API, under the covers SWT is very different from one platform to the next SWT has a unique implementation for each platform and low-level SWT APIs map one-to-one with their platform counterparts For a detailed discussion on how SWT interfaces to the native platform, see http://wwweclipseorg/articles/Article-SWTDesign-1/SWT-Design-1html
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TT 4 The Simple Widget Toolkit
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42 SWT WIDGETS
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SWT provides a rich set of widgets that can be used to create either standalone Java applications or Eclipse plug-ins Before we go into detail on each of the widgets that you are likely to use, it is instructive to explore a simple, standalone SWT example
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421 Simple Standalone Example We will start by revisiting the simple Java project and HelloWorld application created in 1
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4211 Adding the SWTJAR file
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Before we can start using the SWT classes, the SWT JAR file needs to be added to the Java Build Path for the project Right-click on the project and select the Properties command to open the properties dialog Next, select the Java Build Path > Libraries tab and click on the Add Variable button Within the New Variable Classpath Entry dialog, select the
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ECLIPSE_HOME
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variable and then select the Extend button Now find the
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SWT Widgets
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swtjar
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file and click OK The swtjar file can be found buried in the direcname & version num-
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tory titled plugins/orgeclipseswt<platform
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ber>ws<window system>
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Under Windows, for example, you would find it in
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the plug-ins/orgeclipseswtwin32_300/ws/win32 directory (see Figure 41)
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Figure 4-1
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Java Build Path > Libraries properties
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Standalone SWT code
Next, we will modify the HelloWorld class to convert it into a standalone SWT example To do this, remove the contents of the main() method and replace it with the following:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Hello World"); shellsetBounds(100, 100, 200, 50); shellsetLayout(new FillLayout()); Label label = new Label(shell, SWTCENTER); labelsetText("Hello World"); Color red = new Color(display, 255, 0, 0); labelsetForeground(red); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } reddispose(); displaydispose(); }
Note: After entering the new method text, select the Source > Organize Imports command (or press Ctrl+Shift+O) to add imports for all of the referenced SWT classes
Now we will examine each line in detail:
Line 2: Each SWT-based application has one Display instance that represents the link between the underlying platform
SWT Widgets
and SWT In addition to managing the SWT event loop, it also provides access to platform resources that SWT needs It will be disposed in line 14 Line 3: Each window has a Shell representing the window frame that the user interacts with It handles the familiar moving and sizing behavior common to all windows and acts as the parent for any widgets displayed within its bounds Line 4: The setText() method is used to set the title of the window frame Line 5: The setBounds() method is used to set the size and position of the window frame In the example, the window frame will be 200 pixels wide, 50 pixels tall and be positioned 100 pixels from the top-left corner of the screen Line 6: The setLayout() method sets the layout manager for the window frame FillLayout is a simple layout that causes the single child widget to fill the entire bounds of