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關(guān)于插件中圖標(biāo)對象的獲取

2010-01-14 22:54:20 作者: 來源:

默認(rèn)情況下，插件只能取得gif格式的圖片，有時候我們需要獲取其他格式的圖片，這里就需要自己來寫了，最近從另外一個插件aptana下發(fā)現(xiàn)它在獲取非gif格式圖片的一些做法，值得參考
在需要使用圖標(biāo)的地方，需要這樣寫：

java 代碼

private static Image fIconFirefox = JSPlugin.getImage("icons/firefox_icon.png");

JSPlugin中取得照片的相關(guān)代碼要這樣寫：

java 代碼

/**
* Returns an image descriptor for the image file at the given
* plug-in relative path.
*
* @param path the path
* @return the image descriptor
*/
public static ImageDescriptor getImageDescriptor(String path) {
return AbstractUIPlugin.imageDescriptorFromPlugin("com.bstek.ide.js.editor", path); //$NON-NLS-1$
}
private static Hashtable images = new Hashtable();
/**
* getImage
*
* @param path
* @return Image
*/
public static Image getImage(String path)
{
if (images.get(path) == null)
{
ImageDescriptor id = getImageDescriptor(path);
if (id == null)
{
return null;
}
Image i = id.createImage();
images.put(path, i);
return i;
}
else
{
return (Image) images.get(path);
}
}

最終讀取圖標(biāo)對象在AbstractUIPlugin.imageDescriptorFromPlugin()方法中實現(xiàn)

java 代碼

/**
* Creates and returns a new image descriptor for an image file located
* within the specified plug-in.
* <p>
* This is a convenience method that simply locates the image file in
* within the plug-in (no image registries are involved). The path is
* relative to the root of the plug-in, and takes into account files
* coming from plug-in fragments. The path may include $arg$ elements.
* However, the path must not have a leading "." or path separator.
* Clients should use a path like "icons/mysample.gif" rather than
* "./icons/mysample.gif" or "/icons/mysample.gif".
* </p>
*
* @param pluginId the id of the plug-in containing the image file;
* <code>null</code> is returned if the plug-in does not exist
* @param imageFilePath the relative path of the image file, relative to the
* root of the plug-in; the path must be legal
* @return an image descriptor, or <code>null</code> if no image
* could be found
* @since 3.0
*/
public static ImageDescriptor imageDescriptorFromPlugin(String pluginId,
String imageFilePath) {
if (pluginId == null || imageFilePath == null) {
throw new IllegalArgumentException();
}
// if the bundle is not ready then there is no image
Bundle bundle = Platform.getBundle(pluginId);
if (!BundleUtility.isReady(bundle)) {
return null;
}
// look for the image (this will check both the plugin and fragment folders
URL fullPathString = BundleUtility.find(bundle, imageFilePath);
if (fullPathString == null) {
try {
fullPathString = new URL(imageFilePath);
} catch (MalformedURLException e) {
return null;
}
}
if (fullPathString == null) {
return null;
}
return ImageDescriptor.createFromURL(fullPathString);
}

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相關(guān)熱詞搜索：圖標(biāo) 插件對象