CEditor里鼠标悬停在word上显示对应声明代码的提示框的代码

来源：互联网发布：vesa图形编程系统 pdf 编辑：程序博客网时间：2024/05/17 04:26

org.eclipse.jface.text.TextViewerHoverManager

/** * Determines all necessary details and delegates the computation into * a background thread. */protected void computeInformation() {if (!fProcessMouseHoverEvent) {setInformation(null, null);return;}Point location= getHoverEventLocation();int offset= computeOffsetAtLocation(location.x, location.y);if (offset == -1) {setInformation(null, null);return;}final ITextHover hover= fTextViewer.getTextHover(offset, getHoverEventStateMask());if (hover == null) {setInformation(null, null);return;}final IRegion region= hover.getHoverRegion(fTextViewer, offset);if (region == null) {setInformation(null, null);return;}final Rectangle area= JFaceTextUtil.computeArea(region, fTextViewer);if (area == null || area.isEmpty()) {setInformation(null, null);return;}if (fThread != null) {setInformation(null, null);return;}fThread= new Thread("Text Viewer Hover Presenter") { //$NON-NLS-1$public void run() {// http://bugs.eclipse.org/bugs/show_bug.cgi?id=17693boolean hasFinished= false;try {if (fThread != null) {Object information;try {    //此处获取提示信息if (hover instanceof ITextHoverExtension2)information= ((ITextHoverExtension2)hover).getHoverInfo2(fTextViewer, region);elseinformation= hover.getHoverInfo(fTextViewer, region);} catch (ArrayIndexOutOfBoundsException x) {/* * This code runs in a separate thread which can * lead to text offsets being out of bounds when * computing the hover info (see bug 32848). */information= null;}if (hover instanceof ITextHoverExtension)setCustomInformationControlCreator(((ITextHoverExtension) hover).getHoverControlCreator());elsesetCustomInformationControlCreator(null);setInformation(information, area);//此处设置提示信息if (information != null)fTextHover= hover;} else {setInformation(null, null);}hasFinished= true;} catch (RuntimeException ex) {String PLUGIN_ID= "org.eclipse.jface.text"; //$NON-NLS-1$ILog log= Platform.getLog(Platform.getBundle(PLUGIN_ID));log.log(new Status(IStatus.ERROR, PLUGIN_ID, IStatus.OK, "Unexpected runtime error while computing a text hover", ex)); //$NON-NLS-1$} finally {synchronized (fMutex) {if (fTextViewer != null)fTextViewer.removeTextListener(fStopper);fThread= null;// https://bugs.eclipse.org/bugs/show_bug.cgi?id=44756if (!hasFinished)setInformation(null, null);}}}};fThread.setDaemon(true);fThread.setPriority(Thread.MIN_PRIORITY);synchronized (fMutex) {fTextViewer.addTextListener(fStopper);fThread.start();}}

org.eclipse.cdt.internal.ui.text.c.hover.CSourceHover

public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {IEditorPart editor = getEditor();if (editor != null) {IEditorInput input= editor.getEditorInput();IWorkingCopyManager manager= CUIPlugin.getDefault().getWorkingCopyManager();IWorkingCopy copy = manager.getWorkingCopy(input);try {if (copy == null || !copy.isConsistent()) {return null;}} catch (CModelException exc) {return null;}String expression;try {expression = textViewer.getDocument().get(hoverRegion.getOffset(), hoverRegion.getLength());expression = expression.trim();if (expression.length() == 0)return null;//Before trying a search lets make sure that the user is not hovering over a keyword if (selectionIsKeyword(expression))return null;String source= null;// Try with the indexer 在indexer中查找source= searchInIndex(copy, hoverRegion);if (source == null || source.trim().length() == 0)return null;// we are actually interested in the comments, too.//source= removeLeadingComments(source);String delim= System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$String[] sourceLines= Strings.convertIntoLines(source);String firstLine= sourceLines[0];boolean ignoreFirstLine = firstLine.length() > 0 && !Character.isWhitespace(firstLine.charAt(0));Strings.trimIndentation(sourceLines, getTabWidth(), getTabWidth(), !ignoreFirstLine);source = Strings.concatenate(sourceLines, delim);return source;} catch (BadLocationException e) {}}return null;}