[Eclipse] Explore the editor extension in-depth
龚迪
There are some kinds of editors like text editor, properties editor embedded into eclipse.For developers, it is their daily work to use editor to view and modify the code files in the eclipse workbench. What is possible is that we can not only use them in the workbench, but also can know how it works behind the scenes. To be further, it is necessary to extend the provided editors to meet your specific circumstance.
First of all, we need to create a class which is the subclass of AbstractUIPlugin since that editors need eclipse UI supports. class AbstractUIPlugin is the subclass of Plugin.There are some difference in the child plugin lifecycle between Plugin and AbstractUIPlugin because AbstractUIPlugin's subclasses have preference store storage.Both of Plugin and AbstractUIPlugin class implement the interface BundleActivator which means that the start and stop method in your plugin will run when eclipse platform loads your plugin.
public interface BundleActivator {
public void start(BundleContext context) throws Exception;
public void stop(BundleContext context) throws Exception;
}public class JavaEditorExamplePlugin extends AbstractUIPlugin {
public final static String JAVA_PARTITIONING= "__java_example_partitioning";
private static JavaEditorExamplePlugin fgInstance;
private JavaPartitionScanner fPartitionScanner;
private JavaColorProvider fColorProvider;
private JavaCodeScanner fCodeScanner;
private JavaDocScanner fDocScanner;
/**
* Creates a new plug-in instance.
*/
public JavaEditorExamplePlugin() {
fgInstance= this;
}
/**
* Returns the default plug-in instance.
*
* @return the default plug-in instance
*/
public static JavaEditorExamplePlugin getDefault() {
return fgInstance;
}
/**
* Return a scanner for creating Java partitions.
*
* @return a scanner for creating Java partitions
*/
public JavaPartitionScanner getJavaPartitionScanner() {
if (fPartitionScanner == null)
fPartitionScanner= new JavaPartitionScanner();
return fPartitionScanner;
}
/**
* Returns the singleton Java code scanner.
*
* @return the singleton Java code scanner
*/
public RuleBasedScanner getJavaCodeScanner() {
if (fCodeScanner == null)
fCodeScanner= new JavaCodeScanner(getJavaColorProvider());
return fCodeScanner;
}
/**
* Returns the singleton Java color provider.
*
* @return the singleton Java color provider
*/
public JavaColorProvider getJavaColorProvider() {
if (fColorProvider == null)
fColorProvider= new JavaColorProvider();
return fColorProvider;
}
/**
* Returns the singleton Javadoc scanner.
*
* @return the singleton Javadoc scanner
*/
public RuleBasedScanner getJavaDocScanner() {
if (fDocScanner == null)
fDocScanner= new JavaDocScanner(fColorProvider);
return fDocScanner;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>
<plugin
id="org.eclipse.ui.examples.javaeditor"
name="%pluginName"
version="3.1.100.qualifier"
provider-name="%providerName"
class="org.eclipse.ui.examples.javaeditor.JavaEditorExamplePlugin">
<runtime>
<library name="javaeditorexample.jar">
<export name="*"/>
</library>
</runtime>
<requires>
<import plugin="org.eclipse.core.runtime"/>
<import plugin="org.eclipse.ui"/>
<import plugin="org.eclipse.jface.text"/>
<import plugin="org.eclipse.ui.workbench.texteditor"/>
<import plugin="org.eclipse.ui.editors"/>
<import plugin="org.eclipse.ui.views"/>
</requires>
</plugin>For the %pluginName, we can use a properties file to translate them.After the plugin xml and class are created, the next step is to use the extension point. In regard of editor example, org.eclipse.ui.editors extension point is adopted as below.
<extension point="org.eclipse.ui.editors">
<editor
name="%javaEditorName"
icon="icons/obj16/java.gif"
extensions="jav"
contributorClass="org.eclipse.ui.examples.javaeditor.JavaActionContributor"
class="org.eclipse.ui.examples.javaeditor.JavaEditor"
id="org.eclipse.ui.JavaEditor">
</editor>
</extension>class and contributor class are what you need to create and icon is the static image resource.
public class JavaEditor extends TextEditor {
private class DefineFoldingRegionAction extends TextEditorAction {
public DefineFoldingRegionAction(ResourceBundle bundle, String prefix, ITextEditor editor) {
super(bundle, prefix, editor);
}
private IAnnotationModel getAnnotationModel(ITextEditor editor) {
return (IAnnotationModel) editor.getAdapter(ProjectionAnnotationModel.class);
}
/*
* @see org.eclipse.jface.action.Action#run()
*/
public void run() {
ITextEditor editor= getTextEditor();
ISelection selection= editor.getSelectionProvider().getSelection();
if (selection instanceof ITextSelection) {
ITextSelection textSelection= (ITextSelection) selection;
if (!textSelection.isEmpty()) {
IAnnotationModel model= getAnnotationModel(editor);
if (model != null) {
int start= textSelection.getStartLine();
int end= textSelection.getEndLine();
try {
IDocument document= editor.getDocumentProvider().getDocument(editor.getEditorInput());
int offset= document.getLineOffset(start);
int endOffset= document.getLineOffset(end + 1);
Position position= new Position(offset, endOffset - offset);
model.addAnnotation(new ProjectionAnnotation(), position);
} catch (BadLocationException x) {
// ignore
}
}
}
}
}
}
/** The outline page */
private JavaContentOutlinePage fOutlinePage;
/** The projection support */
private ProjectionSupport fProjectionSupport;
/**
* Default constructor.
*/
public JavaEditor() {
super();
}
/** The <code>JavaEditor</code> implementation of this
* <code>AbstractTextEditor</code> method extend the
* actions to add those specific to the receiver
*/
protected void createActions() {
super.createActions();
IAction a= new TextOperationAction(JavaEditorMessages.getResourceBundle(), "ContentAssistProposal.", this, ISourceViewer.CONTENTASSIST_PROPOSALS);
a.setActionDefinitionId(ITextEditorActionDefinitionIds.CONTENT_ASSIST_PROPOSALS);
setAction("ContentAssistProposal", a);
a= new TextOperationAction(JavaEditorMessages.getResourceBundle(), "ContentAssistTip.", this, ISourceViewer.CONTENTASSIST_CONTEXT_INFORMATION);
a.setActionDefinitionId(ITextEditorActionDefinitionIds.CONTENT_ASSIST_CONTEXT_INFORMATION);
setAction("ContentAssistTip", a);
a= new DefineFoldingRegionAction(JavaEditorMessages.getResourceBundle(), "DefineFoldingRegion.", this);
setAction("DefineFoldingRegion", a);
}
/** The <code>JavaEditor</code> implementation of this
* <code>AbstractTextEditor</code> method performs any extra
* disposal actions required by the java editor.
*/
public void dispose() {
if (fOutlinePage != null)
fOutlinePage.setInput(null);
super.dispose();
}
/** The <code>JavaEditor</code> implementation of this
* <code>AbstractTextEditor</code> method performs any extra
* revert behavior required by the java editor.
*/
public void doRevertToSaved() {
super.doRevertToSaved();
if (fOutlinePage != null)
fOutlinePage.update();
}
/** The <code>JavaEditor</code> implementation of this
* <code>AbstractTextEditor</code> method performs any extra
* save behavior required by the java editor.
*
* @param monitor the progress monitor
*/
public void doSave(IProgressMonitor monitor) {
super.doSave(monitor);
if (fOutlinePage != null)
fOutlinePage.update();
}
/** The <code>JavaEditor</code> implementation of this
* <code>AbstractTextEditor</code> method performs any extra
* save as behavior required by the java editor.
*/
public void doSaveAs() {
super.doSaveAs();
if (fOutlinePage != null)
fOutlinePage.update();
}
/** The <code>JavaEditor</code> implementation of this
* <code>AbstractTextEditor</code> method performs sets the
* input of the outline page after AbstractTextEditor has set input.
*
* @param input the editor input
* @throws CoreException in case the input can not be set
*/
public void doSetInput(IEditorInput input) throws CoreException {
super.doSetInput(input);
if (fOutlinePage != null)
fOutlinePage.setInput(input);
}
/*
* @see org.eclipse.ui.texteditor.ExtendedTextEditor#editorContextMenuAboutToShow(org.eclipse.jface.action.IMenuManager)
*/
protected void editorContextMenuAboutToShow(IMenuManager menu) {
super.editorContextMenuAboutToShow(menu);
addAction(menu, "ContentAssistProposal"); //$NON-NLS-1$
addAction(menu, "ContentAssistTip"); //$NON-NLS-1$
addAction(menu, "DefineFoldingRegion"); //$NON-NLS-1$
}
/** The <code>JavaEditor</code> implementation of this
* <code>AbstractTextEditor</code> method performs gets
* the java content outline page if request is for a an
* outline page.
*
* @param required the required type
* @return an adapter for the required type or <code>null</code>
*/
public Object getAdapter(Class required) {
if (IContentOutlinePage.class.equals(required)) {
if (fOutlinePage == null) {
fOutlinePage= new JavaContentOutlinePage(getDocumentProvider(), this);
if (getEditorInput() != null)
fOutlinePage.setInput(getEditorInput());
}
return fOutlinePage;
}
if (fProjectionSupport != null) {
Object adapter= fProjectionSupport.getAdapter(getSourceViewer(), required);
if (adapter != null)
return adapter;
}
return super.getAdapter(required);
}
/* (non-Javadoc)
* Method declared on AbstractTextEditor
*/
protected void initializeEditor() {
super.initializeEditor();
setSourceViewerConfiguration(new JavaSourceViewerConfiguration());
}
/*
* @see org.eclipse.ui.texteditor.ExtendedTextEditor#createSourceViewer(org.eclipse.swt.widgets.Composite, org.eclipse.jface.text.source.IVerticalRuler, int)
*/
protected ISourceViewer createSourceViewer(Composite parent, IVerticalRuler ruler, int styles) {
fAnnotationAccess= createAnnotationAccess();
fOverviewRuler= createOverviewRuler(getSharedColors());
ISourceViewer viewer= new ProjectionViewer(parent, ruler, getOverviewRuler(), isOverviewRulerVisible(), styles);
// ensure decoration support has been created and configured.
getSourceViewerDecorationSupport(viewer);
return viewer;
}
/*
* @see org.eclipse.ui.texteditor.ExtendedTextEditor#createPartControl(org.eclipse.swt.widgets.Composite)
*/
public void createPartControl(Composite parent) {
super.createPartControl(parent);
ProjectionViewer viewer= (ProjectionViewer) getSourceViewer();
fProjectionSupport= new ProjectionSupport(viewer, getAnnotationAccess(), getSharedColors());
fProjectionSupport.addSummarizableAnnotationType("org.eclipse.ui.workbench.texteditor.error");
fProjectionSupport.addSummarizableAnnotationType("org.eclipse.ui.workbench.texteditor.warning");
fProjectionSupport.install();
viewer.doOperation(ProjectionViewer.TOGGLE);
}
/*
* @see org.eclipse.ui.texteditor.AbstractTextEditor#adjustHighlightRange(int, int)
*/
protected void adjustHighlightRange(int offset, int length) {
ISourceViewer viewer= getSourceViewer();
if (viewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension= (ITextViewerExtension5) viewer;
extension.exposeModelRange(new Region(offset, length));
}
}
}
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