Download Professional Java Native Interfaces with SWT/JFace by Jackwind Li Guojie PDF
By Jackwind Li Guojie
Specialist Java local Interfaces takes a solutions-based technique in exhibiting how SWT/JFace works, discussing every one universal part, offering invaluable, sensible rules, assistance and methods to make the Java builders' paintings more straightforward. the writer presents proper and well timed examples, either stand-alone functions and smaller code snippets that readers can contain into their very own code.To offer a really real-world caliber, the writer builds an email/ftp purchaser pattern program to teach readers tips on how to mix every little thing right into a presentable Java local UI program.
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Extra info for Professional Java Native Interfaces with SWT/JFace
Example text
On the tree in the left panel, select Paths. Select the Required Libraries tab at the bottom of the Paths panel. Click the Add button and a dialog pops up. Click New to create a new library set. In the new library wizard, specify the name for the library, such as SWT-JFace, and then click Add to add each of the JAR files required. Click OK to add the newly created library to the project, as shown in Figure 3-2. Figure 3-2 3. Click OK in the Properties dialog to save your classpath setting and close the Properties dialog.
This is one of the advantages of using image registries. Chapter 2: SWT/JFace Mechanisms 39 40 Chapter 2: SWT/JFace Mechanisms If you do not use an ImageRegistry, the displayFiles method needs to be rewritten as follows: public void displayFiles(String[] files) { // Disposes all of the images used by the table items first. dispose(); } // Removes all existing table items. setText(files[i]); } } The preceding code is not only tedious but also computationally expensive. For each file, an image is created and loaded.
Public void put(String key, Image image): Adds an image to this ImageRegistry. Keep in mind that the image must not be disposed of by the clients after the image has been put into the registry. This seems to break Rule 1 discussed earlier in the chapter. Actually, by making this call, the caller transfers the responsibility of resource management to the ImageRegistry. ♦ public Image get(String key): Returns the image associated with the specified key, or null if it does not exist. ♦ public ImageDescriptor getDescriptor(String key): Returns the image descriptor associated with the specified key, or null if it does not exist.