[原][Java]eclipse 修改自动提示
前者按 http://blog.csdn.net/tomsheng321/article/details/39548627 修改
后者按 http://blog.csdn.net/lethwei/article/details/5837282 修改，同时注释了 accept 方法实现 和 去掉 Home End 键在提示窗口的上下定位
/******************************************************************************* * Copyright (c) 2000, 2010 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Sean Montgomery, sean_montgomery@comcast.net - https://bugs.eclipse.org/bugs/show_bug.cgi?id=116454 *******************************************************************************/ package org.eclipse.jface.text.contentassist; import java.util.ArrayList; import java.util.List; import org.eclipse.osgi.util.TextProcessor; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.BusyIndicator; import org.eclipse.swt.custom.StyleRange; import org.eclipse.swt.events.ControlEvent; import org.eclipse.swt.events.ControlListener; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.FocusEvent; import org.eclipse.swt.events.FocusListener; import org.eclipse.swt.events.KeyAdapter; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.events.KeyListener; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.events.TraverseEvent; import org.eclipse.swt.events.TraverseListener; import org.eclipse.swt.events.VerifyEvent; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.FontData; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableItem; import org.eclipse.core.commands.AbstractHandler; import org.eclipse.core.commands.ExecutionEvent; import org.eclipse.core.commands.ExecutionException; import org.eclipse.core.commands.IHandler; import org.eclipse.core.runtime.Assert; import org.eclipse.jface.bindings.keys.KeySequence; import org.eclipse.jface.bindings.keys.SWTKeySupport; import org.eclipse.jface.contentassist.IContentAssistSubjectControl; import org.eclipse.jface.internal.text.InformationControlReplacer; import org.eclipse.jface.internal.text.TableOwnerDrawSupport; import org.eclipse.jface.preference.JFacePreferences; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.util.Geometry; import org.eclipse.jface.viewers.StyledString; import org.eclipse.jface.text.AbstractInformationControlManager; import org.eclipse.jface.text.AbstractInformationControlManager.Anchor; import org.eclipse.jface.text.BadLocationException; import org.eclipse.jface.text.DocumentEvent; import org.eclipse.jface.text.IDocument; import org.eclipse.jface.text.IDocumentListener; import org.eclipse.jface.text.IEditingSupport; import org.eclipse.jface.text.IEditingSupportRegistry; import org.eclipse.jface.text.IInformationControl; import org.eclipse.jface.text.IRegion; import org.eclipse.jface.text.IRewriteTarget; import org.eclipse.jface.text.ITextViewer; import org.eclipse.jface.text.ITextViewerExtension; import org.eclipse.jface.text.TextUtilities; /** * This class is used to present proposals to the user. If additional * information exists for a proposal, then selecting that proposal will result * in the information being displayed in a secondary window. * * @see org.eclipse.jface.text.contentassist.ICompletionProposal * @see org.eclipse.jface.text.contentassist.AdditionalInfoController */ class CompletionProposalPopup implements IContentAssistListener { /** * Set to <code>true</code> to use a Table with SWT.VIRTUAL. XXX: This is a * workaround for: https://bugs.eclipse.org/bugs/show_bug.cgi?id=90321 More * details see also: https://bugs.eclipse.org/bugs/show_bug.cgi?id=98585#c36 * * @since 3.1 */ private static final boolean USE_VIRTUAL = !"motif".equals(SWT.getPlatform()); //$NON-NLS-1$ /** * Completion proposal selection handler. * * @since 3.4 */ final class ProposalSelectionHandler extends AbstractHandler { /** * Selection operation codes. */ static final int SELECT_NEXT = 1; static final int SELECT_PREVIOUS = 2; private final int fOperationCode; /** * Creates a new selection handler. * * @param operationCode * the operation code * @since 3.4 */ public ProposalSelectionHandler(int operationCode) { Assert.isLegal(operationCode == SELECT_NEXT || operationCode == SELECT_PREVIOUS); fOperationCode = operationCode; } /* * @see * org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core * .commands.ExecutionEvent) * * @since 3.4 */ public Object execute(ExecutionEvent event) throws ExecutionException { int itemCount = fProposalTable.getItemCount(); int selectionIndex = fProposalTable.getSelectionIndex(); switch (fOperationCode) { case SELECT_NEXT: selectionIndex += 1; if (selectionIndex > itemCount - 1) selectionIndex = 0; break; case SELECT_PREVIOUS: selectionIndex -= 1; if (selectionIndex < 0) selectionIndex = itemCount - 1; break; } selectProposal(selectionIndex, false); return null; } } /** * The empty proposal displayed if there is nothing else to show. * * @since 3.2 */ private static final class EmptyProposal implements ICompletionProposal, ICompletionProposalExtension { String fDisplayString; int fOffset; /* * @see ICompletionProposal#apply(IDocument) */ public void apply(IDocument document) { } /* * @see ICompletionProposal#getSelection(IDocument) */ public Point getSelection(IDocument document) { return new Point(fOffset, 0); } /* * @see ICompletionProposal#getContextInformation() */ public IContextInformation getContextInformation() { return null; } /* * @see ICompletionProposal#getImage() */ public Image getImage() { return null; } /* * @see ICompletionProposal#getDisplayString() */ public String getDisplayString() { return fDisplayString; } /* * @see ICompletionProposal#getAdditionalProposalInfo() */ public String getAdditionalProposalInfo() { return null; } /* * @see * org.eclipse.jface.text.contentassist.ICompletionProposalExtension * #apply(org.eclipse.jface.text.IDocument, char, int) */ public void apply(IDocument document, char trigger, int offset) { } /* * @see * org.eclipse.jface.text.contentassist.ICompletionProposalExtension * #isValidFor(org.eclipse.jface.text.IDocument, int) */ public boolean isValidFor(IDocument document, int offset) { return false; } /* * @see * org.eclipse.jface.text.contentassist.ICompletionProposalExtension * #getTriggerCharacters() */ public char[] getTriggerCharacters() { return null; } /* * @see * org.eclipse.jface.text.contentassist.ICompletionProposalExtension * #getContextInformationPosition() */ public int getContextInformationPosition() { return -1; } } private final class ProposalSelectionListener implements KeyListener { public void keyPressed(KeyEvent e) { if (!Helper.okToUse(fProposalShell)) return; if (e.character == 0 && e.keyCode == SWT.CTRL) { // http://dev.eclipse.org/bugs/show_bug.cgi?id=34754 int index = fProposalTable.getSelectionIndex(); if (index >= 0) selectProposal(index, true); } } public void keyReleased(KeyEvent e) { if (!Helper.okToUse(fProposalShell)) return; if (e.character == 0 && e.keyCode == SWT.CTRL) { // http://dev.eclipse.org/bugs/show_bug.cgi?id=34754 int index = fProposalTable.getSelectionIndex(); if (index >= 0) selectProposal(index, false); } } } private final class CommandKeyListener extends KeyAdapter { private final KeySequence fCommandSequence; private CommandKeyListener(KeySequence keySequence) { fCommandSequence = keySequence; } public void keyPressed(KeyEvent e) { if (!Helper.okToUse(fProposalShell)) return; int accelerator = SWTKeySupport.convertEventToUnmodifiedAccelerator(e); KeySequence sequence = KeySequence.getInstance(SWTKeySupport.convertAcceleratorToKeyStroke(accelerator)); if (sequence.equals(fCommandSequence)) if (fContentAssistant.isPrefixCompletionEnabled()) incrementalComplete(); else showProposals(false); } } /** The associated text viewer. */ private ITextViewer fViewer; /** The associated content assistant. */ private final ContentAssistant fContentAssistant; /** The used additional info controller, or <code>null</code> if none. */ private final AdditionalInfoController fAdditionalInfoController; /** The closing strategy for this completion proposal popup. */ private final PopupCloser fPopupCloser = new PopupCloser(); /** The popup shell. */ private Shell fProposalShell; /** The proposal table. */ private Table fProposalTable; /** Indicates whether a completion proposal is being inserted. */ private boolean fInserting = false; /** The key listener to control navigation. */ private ProposalSelectionListener fKeyListener; /** List of document events used for filtering proposals. */ private final List fDocumentEvents = new ArrayList(); /** Listener filling the document event queue. */ private IDocumentListener fDocumentListener; /** The filter list of proposals. */ private ICompletionProposal[] fFilteredProposals; /** The computed list of proposals. */ private ICompletionProposal[] fComputedProposals; /** The offset for which the proposals have been computed. */ private int fInvocationOffset; /** The offset for which the computed proposals have been filtered. */ private int fFilterOffset; /** * The most recently selected proposal. * * @since 3.0 */ private ICompletionProposal fLastProposal; /** * The content assist subject control. This replaces <code>fViewer</code> * * @since 3.0 */ private IContentAssistSubjectControl fContentAssistSubjectControl; /** * The content assist subject control adapter. This replaces * <code>fViewer</code> * * @since 3.0 */ private final ContentAssistSubjectControlAdapter fContentAssistSubjectControlAdapter; /** * Remembers the size for this completion proposal popup. * * @since 3.0 */ private Point fSize; /** * Editor helper that communicates that the completion proposal popup may * have focus while the 'logical focus' is still with the editor. * * @since 3.1 */ private IEditingSupport fFocusHelper; /** * Set to true by {@link #computeFilteredProposals(int, DocumentEvent)} if * the returned proposals are a subset of {@link #fFilteredProposals}, * <code>false</code> if not. * * @since 3.1 */ private boolean fIsFilteredSubset; /** * The filter runnable. * * @since 3.1.1 */ private final Runnable fFilterRunnable = new Runnable() { public void run() { if (!fIsFilterPending) return; fIsFilterPending = false; if (!Helper.okToUse(fContentAssistSubjectControlAdapter.getControl())) return; int offset = fContentAssistSubjectControlAdapter.getSelectedRange().x; ICompletionProposal[] proposals = null; try { if (offset > -1) { DocumentEvent event = TextUtilities.mergeProcessedDocumentEvents(fDocumentEvents); proposals = computeFilteredProposals(offset, event); } } catch (BadLocationException x) { } finally { fDocumentEvents.clear(); } fFilterOffset = offset; if (proposals != null && proposals.length > 0) setProposals(proposals, fIsFilteredSubset); else hide(); } }; /** * <code>true</code> if <code>fFilterRunnable</code> has been posted, * <code>false</code> if not. * * @since 3.1.1 */ private boolean fIsFilterPending = false; /** * The info message at the bottom of the popup, or <code>null</code> for no * popup (if ContentAssistant does not provide one). * * @since 3.2 */ private Label fMessageText; /** * The font used for <code>fMessageText</code> or null; dispose when done. * * @since 3.2 */ private Font fMessageTextFont; /** * The most recent completion offset (used to determine repeated invocation) * * @since 3.2 */ private int fLastCompletionOffset; /** * The (reusable) empty proposal. * * @since 3.2 */ private final EmptyProposal fEmptyProposal = new EmptyProposal(); /** * The text for the empty proposal, or <code>null</code> to use the default * text. * * @since 3.2 */ private String fEmptyMessage = null; /** * Tells whether colored labels support is enabled. Only valid while the * popup is active. * * @since 3.4 */ private boolean fIsColoredLabelsSupportEnabled = false; /** * Creates a new completion proposal popup for the given elements. * * @param contentAssistant * the content assistant feeding this popup * @param viewer * the viewer on top of which this popup appears * @param infoController * the information control collaborating with this popup, or * <code>null</code> * @since 2.0 */ public CompletionProposalPopup(ContentAssistant contentAssistant, ITextViewer viewer, AdditionalInfoController infoController) { fContentAssistant = contentAssistant; fViewer = viewer; fAdditionalInfoController = infoController; fContentAssistSubjectControlAdapter = new ContentAssistSubjectControlAdapter(fViewer); } /** * Creates a new completion proposal popup for the given elements. * * @param contentAssistant * the content assistant feeding this popup * @param contentAssistSubjectControl * the content assist subject control on top of which this popup * appears * @param infoController * the information control collaborating with this popup, or * <code>null</code> * @since 3.0 */ public CompletionProposalPopup(ContentAssistant contentAssistant, IContentAssistSubjectControl contentAssistSubjectControl, AdditionalInfoController infoController) { fContentAssistant = contentAssistant; fContentAssistSubjectControl = contentAssistSubjectControl; fAdditionalInfoController = infoController; fContentAssistSubjectControlAdapter = new ContentAssistSubjectControlAdapter(fContentAssistSubjectControl); } /** * Computes and presents completion proposals. The flag indicates whether * this call has be made out of an auto activation context. * * @param autoActivated * <code>true</code> if auto activation context * @return an error message or <code>null</code> in case of no error */ public String showProposals(final boolean autoActivated) { if (fKeyListener == null) fKeyListener = new ProposalSelectionListener(); final Control control = fContentAssistSubjectControlAdapter.getControl(); if (!Helper.okToUse(fProposalShell) && control != null && !control.isDisposed()) { // add the listener before computing the proposals so we don't move // the caret // when the user types fast. fContentAssistSubjectControlAdapter.addKeyListener(fKeyListener); BusyIndicator.showWhile(control.getDisplay(), new Runnable() { public void run() { fInvocationOffset = fContentAssistSubjectControlAdapter.getSelectedRange().x; fFilterOffset = fInvocationOffset; fLastCompletionOffset = fFilterOffset; fComputedProposals = computeProposals(fInvocationOffset); int count = (fComputedProposals == null ? 0 : fComputedProposals.length); if (count == 0 && hideWhenNoProposals(autoActivated)) return; if (count == 1 && !autoActivated && canAutoInsert(fComputedProposals[0])) { insertProposal(fComputedProposals[0], (char) 0, 0, fInvocationOffset); hide(); } else { createProposalSelector(); setProposals(fComputedProposals, false); displayProposals(); } } }); } else { fLastCompletionOffset = fFilterOffset; handleRepeatedInvocation(); } return getErrorMessage(); } /** * Hides the popup and returns <code>true</code> if the popup is configured * to never display an empty list. Returns <code>false</code> otherwise. * * @param autoActivated * whether the invocation was auto-activated * @return <code>false</code> if an empty list should be displayed, * <code>true</code> otherwise * @since 3.2 */ private boolean hideWhenNoProposals(boolean autoActivated) { if (autoActivated || !fContentAssistant.isShowEmptyList()) { if (!autoActivated) { Control control = fContentAssistSubjectControlAdapter.getControl(); if (control != null && !control.isDisposed()) control.getDisplay().beep(); } hide(); return true; } return false; } /** * If content assist is set up to handle cycling, then the proposals are * recomputed. Otherwise, nothing happens. * * @since 3.2 */ private void handleRepeatedInvocation() { if (fContentAssistant.isRepeatedInvocationMode()) { fComputedProposals = computeProposals(fFilterOffset); setProposals(fComputedProposals, false); } } /** * Returns the completion proposal available at the given offset of the * viewer's document. Delegates the work to the content assistant. * * @param offset * the offset * @return the completion proposals available at this offset */ private ICompletionProposal[] computeProposals(int offset) { if (fContentAssistSubjectControl != null) return fContentAssistant.computeCompletionProposals(fContentAssistSubjectControl, offset); return fContentAssistant.computeCompletionProposals(fViewer, offset); } /** * Returns the error message. * * @return the error message */ private String getErrorMessage() { return fContentAssistant.getErrorMessage(); } /** * Creates the proposal selector. */ private void createProposalSelector() { if (Helper.okToUse(fProposalShell)) return; Control control = fContentAssistSubjectControlAdapter.getControl(); fProposalShell = new Shell(control.getShell(), SWT.ON_TOP | SWT.RESIZE); fProposalShell.setFont(JFaceResources.getDefaultFont()); if (USE_VIRTUAL) { fProposalTable = new Table(fProposalShell, SWT.H_SCROLL | SWT.V_SCROLL | SWT.VIRTUAL); Listener listener = new Listener() { public void handleEvent(Event event) { handleSetData(event); } }; fProposalTable.addListener(SWT.SetData, listener); } else { fProposalTable = new Table(fProposalShell, SWT.H_SCROLL | SWT.V_SCROLL); } fIsColoredLabelsSupportEnabled = fContentAssistant.isColoredLabelsSupportEnabled(); if (fIsColoredLabelsSupportEnabled) TableOwnerDrawSupport.install(fProposalTable); fProposalTable.setLocation(0, 0); if (fAdditionalInfoController != null) fAdditionalInfoController.setSizeConstraints(50, 10, true, true); GridLayout layout = new GridLayout(); layout.marginWidth = 0; layout.marginHeight = 0; layout.verticalSpacing = 1; fProposalShell.setLayout(layout); if (fContentAssistant.isStatusLineVisible()) { createMessageText(); } GridData data = new GridData(GridData.FILL_BOTH); Point size = fContentAssistant.restoreCompletionProposalPopupSize(); if (size != null) { fProposalTable.setLayoutData(data); fProposalShell.setSize(size); } else { int height = fProposalTable.getItemHeight() * 10; // use golden ratio as default aspect ratio final double aspectRatio = (1 + Math.sqrt(5)) / 2; int width = (int) (height * aspectRatio); Rectangle trim = fProposalTable.computeTrim(0, 0, width, height); data.heightHint = trim.height; data.widthHint = trim.width; fProposalTable.setLayoutData(data); fProposalShell.pack(); } fContentAssistant.addToLayout(this, fProposalShell, ContentAssistant.LayoutManager.LAYOUT_PROPOSAL_SELECTOR, fContentAssistant.getSelectionOffset()); fProposalShell.addControlListener(new ControlListener() { public void controlMoved(ControlEvent e) { } public void controlResized(ControlEvent e) { if (fAdditionalInfoController != null) { // reset the cached resize constraints fAdditionalInfoController.setSizeConstraints(50, 10, true, false); fAdditionalInfoController.hideInformationControl(); fAdditionalInfoController.handleTableSelectionChanged(); } fSize = fProposalShell.getSize(); } }); fProposalShell.setBackground(control.getDisplay().getSystemColor(SWT.COLOR_GRAY)); Color c = getBackgroundColor(control); fProposalTable.setBackground(c); c = getForegroundColor(control); fProposalTable.setForeground(c); fProposalTable.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent e) { } public void widgetDefaultSelected(SelectionEvent e) { insertSelectedProposalWithMask(e.stateMask); } }); fPopupCloser.install(fContentAssistant, fProposalTable, fAdditionalInfoController); fProposalShell.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent e) { unregister(); // but don't dispose the shell, since we're being // called from its disposal event! } }); fProposalTable.setHeaderVisible(false); addCommandSupport(fProposalTable); } /** * Returns the minimal required height for the proposal, may return 0 if the * popup has not been created yet. * * @return the minimal height * @since 3.3 */ int getMinimalHeight() { int height = 0; if (Helper.okToUse(fProposalTable)) { int items = fProposalTable.getItemHeight() * 10; Rectangle trim = fProposalTable.computeTrim(0, 0, SWT.DEFAULT, items); height = trim.height; } if (Helper.okToUse(fMessageText)) height += fMessageText.getSize().y + 1; return height; } /** * Adds command support to the given control. * * @param control * the control to watch for focus * @since 3.2 */ private void addCommandSupport(final Control control) { final KeySequence commandSequence = fContentAssistant.getRepeatedInvocationKeySequence(); if (commandSequence != null && !commandSequence.isEmpty() && fContentAssistant.isRepeatedInvocationMode()) { control.addFocusListener(new FocusListener() { private CommandKeyListener fCommandKeyListener; public void focusGained(FocusEvent e) { if (Helper.okToUse(control)) { if (fCommandKeyListener == null) { fCommandKeyListener = new CommandKeyListener(commandSequence); fProposalTable.addKeyListener(fCommandKeyListener); } } } public void focusLost(FocusEvent e) { if (fCommandKeyListener != null) { control.removeKeyListener(fCommandKeyListener); fCommandKeyListener = null; } } }); } if (fAdditionalInfoController != null) { control.addFocusListener(new FocusListener() { private TraverseListener fTraverseListener; public void focusGained(FocusEvent e) { if (Helper.okToUse(control)) { if (fTraverseListener == null) { fTraverseListener = new TraverseListener() { public void keyTraversed(TraverseEvent event) { if (event.detail == SWT.TRAVERSE_TAB_NEXT) { IInformationControl iControl = fAdditionalInfoController.getCurrentInformationControl2(); if (fAdditionalInfoController.getInternalAccessor().canReplace(iControl)) { fAdditionalInfoController.getInternalAccessor().replaceInformationControl(true); event.doit = false; } } } }; fProposalTable.addTraverseListener(fTraverseListener); } } } public void focusLost(FocusEvent e) { if (fTraverseListener != null) { control.removeTraverseListener(fTraverseListener); fTraverseListener = null; } } }); } } /** * Returns the background color to use. * * @param control * the control to get the display from * @return the background color * @since 3.2 */ private Color getBackgroundColor(Control control) { Color c = fContentAssistant.getProposalSelectorBackground(); if (c == null) c = JFaceResources.getColorRegistry().get(JFacePreferences.CONTENT_ASSIST_BACKGROUND_COLOR); return c; } /** * Returns the foreground color to use. * * @param control * the control to get the display from * @return the foreground color * @since 3.2 */ private Color getForegroundColor(Control control) { Color c = fContentAssistant.getProposalSelectorForeground(); if (c == null) c = JFaceResources.getColorRegistry().get(JFacePreferences.CONTENT_ASSIST_FOREGROUND_COLOR); return c; } /** * Creates the caption line under the proposal table. * * @since 3.2 */ private void createMessageText() { if (fMessageText == null) { fMessageText = new Label(fProposalShell, SWT.RIGHT); GridData textData = new GridData(SWT.FILL, SWT.BOTTOM, true, false); fMessageText.setLayoutData(textData); fMessageText.setText(fContentAssistant.getStatusMessage() + " "); //$NON-NLS-1$ if (fMessageTextFont == null) { Font font = fMessageText.getFont(); Display display = fProposalShell.getDisplay(); FontData[] fontDatas = font.getFontData(); for (int i = 0; i < fontDatas.length; i++) fontDatas[i].setHeight(fontDatas[i].getHeight() * 9 / 10); fMessageTextFont = new Font(display, fontDatas); } fMessageText.setFont(fMessageTextFont); fMessageText.setBackground(getBackgroundColor(fProposalShell)); fMessageText.setForeground(getForegroundColor(fProposalShell)); if (fContentAssistant.isRepeatedInvocationMode()) { fMessageText.setCursor(fProposalShell.getDisplay().getSystemCursor(SWT.CURSOR_HAND)); fMessageText.addMouseListener(new MouseAdapter() { public void mouseUp(MouseEvent e) { fLastCompletionOffset = fFilterOffset; fProposalTable.setFocus(); handleRepeatedInvocation(); } public void mouseDown(MouseEvent e) { } }); } } } /* * @since 3.1 */ private void handleSetData(Event event) { TableItem item = (TableItem) event.item; int index = fProposalTable.indexOf(item); if (0 <= index && index < fFilteredProposals.length) { ICompletionProposal current = fFilteredProposals[index]; String displayString; StyleRange[] styleRanges = null; if (fIsColoredLabelsSupportEnabled && current instanceof ICompletionProposalExtension6) { StyledString styledString = ((ICompletionProposalExtension6) current).getStyledDisplayString(); displayString = styledString.getString(); styleRanges = styledString.getStyleRanges(); } else displayString = current.getDisplayString(); item.setText(displayString); if (fIsColoredLabelsSupportEnabled) TableOwnerDrawSupport.storeStyleRanges(item, 0, styleRanges); item.setImage(current.getImage()); item.setData(current); } else { // this should not happen, but does on win32 } } /** * Returns the proposal selected in the proposal selector. * * @return the selected proposal * @since 2.0 */ private ICompletionProposal getSelectedProposal() { /* * Make sure that there is no filter runnable pending. See * https://bugs.eclipse.org/bugs/show_bug.cgi?id=31427 */ if (fIsFilterPending) fFilterRunnable.run(); // filter runnable may have hidden the proposals if (!Helper.okToUse(fProposalTable)) return null; int i = fProposalTable.getSelectionIndex(); if (fFilteredProposals == null || i < 0 || i >= fFilteredProposals.length) return null; return fFilteredProposals[i]; } /** * Takes the selected proposal and applies it. * * @param stateMask * the state mask * @since 3.2 */ private void insertSelectedProposalWithMask(int stateMask) { ICompletionProposal p = getSelectedProposal(); hide(); if (p != null) insertProposal(p, (char) 0, stateMask, fContentAssistSubjectControlAdapter.getSelectedRange().x); } /** * Applies the given proposal at the given offset. The given character is * the one that triggered the insertion of this proposal. * * @param p * the completion proposal * @param trigger * the trigger character * @param stateMask * the state mask * @param offset * the offset * @since 2.1 */ private void insertProposal(ICompletionProposal p, char trigger, int stateMask, final int offset) { fInserting = true; IRewriteTarget target = null; IEditingSupport helper = new IEditingSupport() { public boolean isOriginator(DocumentEvent event, IRegion focus) { return focus.getOffset() <= offset && focus.getOffset() + focus.getLength() >= offset; } public boolean ownsFocusShell() { return false; } }; try { IDocument document = fContentAssistSubjectControlAdapter.getDocument(); if (fViewer instanceof ITextViewerExtension) { ITextViewerExtension extension = (ITextViewerExtension) fViewer; target = extension.getRewriteTarget(); } if (target != null) target.beginCompoundChange(); if (fViewer instanceof IEditingSupportRegistry) { IEditingSupportRegistry registry = (IEditingSupportRegistry) fViewer; registry.register(helper); } if (p instanceof ICompletionProposalExtension2 && fViewer != null) { ICompletionProposalExtension2 e = (ICompletionProposalExtension2) p; e.apply(fViewer, trigger, stateMask, offset); } else if (p instanceof ICompletionProposalExtension) { ICompletionProposalExtension e = (ICompletionProposalExtension) p; e.apply(document, trigger, offset); } else { p.apply(document); } Point selection = p.getSelection(document); if (selection != null) { fContentAssistSubjectControlAdapter.setSelectedRange(selection.x, selection.y); fContentAssistSubjectControlAdapter.revealRange(selection.x, selection.y); } IContextInformation info = p.getContextInformation(); if (info != null) { int contextInformationOffset; if (p instanceof ICompletionProposalExtension) { ICompletionProposalExtension e = (ICompletionProposalExtension) p; contextInformationOffset = e.getContextInformationPosition(); } else { if (selection == null) selection = fContentAssistSubjectControlAdapter.getSelectedRange(); contextInformationOffset = selection.x + selection.y; } fContentAssistant.showContextInformation(info, contextInformationOffset); } else fContentAssistant.showContextInformation(null, -1); } finally { if (target != null) target.endCompoundChange(); if (fViewer instanceof IEditingSupportRegistry) { IEditingSupportRegistry registry = (IEditingSupportRegistry) fViewer; registry.unregister(helper); } fInserting = false; } } /** * Returns whether this popup has the focus. * * @return <code>true</code> if the popup has the focus */ public boolean hasFocus() { if (Helper.okToUse(fProposalShell)) { if ((fProposalShell.getDisplay().getActiveShell() == fProposalShell)) return true; /* * We have to delegate this query to the additional info controller * as well, since the content assistant is the widget token owner * and its closer does not know that the additional info control can * now also take focus. */ if (fAdditionalInfoController != null) { IInformationControl informationControl = fAdditionalInfoController.getCurrentInformationControl2(); if (informationControl != null && informationControl.isFocusControl()) return true; InformationControlReplacer replacer = fAdditionalInfoController.getInternalAccessor().getInformationControlReplacer(); if (replacer != null) { informationControl = replacer.getCurrentInformationControl2(); if (informationControl != null && informationControl.isFocusControl()) return true; } } } return false; } /** * Hides this popup. */ public void hide() { unregister(); if (fViewer instanceof IEditingSupportRegistry) { IEditingSupportRegistry registry = (IEditingSupportRegistry) fViewer; registry.unregister(fFocusHelper); } if (Helper.okToUse(fProposalShell)) { fContentAssistant.removeContentAssistListener(this, ContentAssistant.PROPOSAL_SELECTOR); fPopupCloser.uninstall(); fProposalShell.setVisible(false); fProposalShell.dispose(); fProposalShell = null; } if (fMessageTextFont != null) { fMessageTextFont.dispose(); fMessageTextFont = null; } if (fMessageText != null) { fMessageText = null; } fEmptyMessage = null; fLastCompletionOffset = -1; fContentAssistant.fireSessionEndEvent(); } /** * Unregister this completion proposal popup. * * @since 3.0 */ private void unregister() { if (fDocumentListener != null) { IDocument document = fContentAssistSubjectControlAdapter.getDocument(); if (document != null) document.removeDocumentListener(fDocumentListener); fDocumentListener = null; } fDocumentEvents.clear(); if (fKeyListener != null && fContentAssistSubjectControlAdapter.getControl() != null && !fContentAssistSubjectControlAdapter.getControl().isDisposed()) { fContentAssistSubjectControlAdapter.removeKeyListener(fKeyListener); fKeyListener = null; } if (fLastProposal != null) { if (fLastProposal instanceof ICompletionProposalExtension2 && fViewer != null) { ICompletionProposalExtension2 extension = (ICompletionProposalExtension2) fLastProposal; extension.unselected(fViewer); } fLastProposal = null; } fFilteredProposals = null; fComputedProposals = null; fContentAssistant.possibleCompletionsClosed(); } /** * Returns whether this popup is active. It is active if the proposal * selector is visible. * * @return <code>true</code> if this popup is active */ public boolean isActive() { return fProposalShell != null && !fProposalShell.isDisposed(); } /** * Initializes the proposal selector with these given proposals. * * @param proposals * the proposals * @param isFilteredSubset * if <code>true</code>, the proposal table is not cleared, but * the proposals that are not in the passed array are removed * from the displayed set */ private void setProposals(ICompletionProposal[] proposals, boolean isFilteredSubset) { ICompletionProposal[] oldProposals = fFilteredProposals; ICompletionProposal oldProposal = getSelectedProposal(); // may trigger // filtering // and a // reentrant // call to // setProposals() if (oldProposals != fFilteredProposals) // reentrant call was first - // abort return; if (Helper.okToUse(fProposalTable)) { if (oldProposal instanceof ICompletionProposalExtension2 && fViewer != null) ((ICompletionProposalExtension2) oldProposal).unselected(fViewer); if (proposals == null || proposals.length == 0) { fEmptyProposal.fOffset = fFilterOffset; fEmptyProposal.fDisplayString = fEmptyMessage != null ? fEmptyMessage : JFaceTextMessages.getString("CompletionProposalPopup.no_proposals"); //$NON-NLS-1$ proposals = new ICompletionProposal[] { fEmptyProposal }; } fFilteredProposals = proposals; final int newLen = proposals.length; if (USE_VIRTUAL) { fProposalTable.setItemCount(newLen); fProposalTable.clearAll(); } else { fProposalTable.setRedraw(false); fProposalTable.setItemCount(newLen); TableItem[] items = fProposalTable.getItems(); for (int i = 0; i < items.length; i++) { TableItem item = items[i]; ICompletionProposal proposal = proposals[i]; item.setText(proposal.getDisplayString()); item.setImage(proposal.getImage()); item.setData(proposal); } fProposalTable.setRedraw(true); } Point currentLocation = fProposalShell.getLocation(); Point newLocation = getLocation(); if ((newLocation.x < currentLocation.x && newLocation.y == currentLocation.y) || newLocation.y < currentLocation.y) fProposalShell.setLocation(newLocation); selectProposal(0, false); } } /** * Returns the graphical location at which this popup should be made * visible. * * @return the location of this popup */ private Point getLocation() { int caret = fContentAssistSubjectControlAdapter.getCaretOffset(); Rectangle location = fContentAssistant.getLayoutManager().computeBoundsBelowAbove(fProposalShell, fSize == null ? fProposalShell.getSize() : fSize, caret, this); return Geometry.getLocation(location); } /** * Returns the size of this completion proposal popup. * * @return a Point containing the size * @since 3.0 */ Point getSize() { return fSize; } /** * Displays this popup and install the additional info controller, so that * additional info is displayed when a proposal is selected and additional * info is available. */ private void displayProposals() { if (!Helper.okToUse(fProposalShell) || !Helper.okToUse(fProposalTable)) return; if (fContentAssistant.addContentAssistListener(this, ContentAssistant.PROPOSAL_SELECTOR)) { ensureDocumentListenerInstalled(); if (fFocusHelper == null) { fFocusHelper = new IEditingSupport() { public boolean isOriginator(DocumentEvent event, IRegion focus) { return false; // this helper just covers the focus // change to the proposal shell, no // remote editions } public boolean ownsFocusShell() { return true; } }; } if (fViewer instanceof IEditingSupportRegistry) { IEditingSupportRegistry registry = (IEditingSupportRegistry) fViewer; registry.register(fFocusHelper); } /* * https://bugs.eclipse.org/bugs/show_bug.cgi?id=52646 on GTK, * setVisible and such may run the event loop (see also * https://bugs.eclipse.org/bugs/show_bug.cgi?id=47511) Since the * user may have already canceled the popup or selected an entry * (ESC or RETURN), we have to double check whether the table is * still okToUse. See comments below */ fProposalShell.setVisible(true); // may run event loop on GTK // transfer focus since no verify key listener can be attached if (!fContentAssistSubjectControlAdapter.supportsVerifyKeyListener() && Helper.okToUse(fProposalShell)) fProposalShell.setFocus(); // may run event loop on GTK ?? if (fAdditionalInfoController != null && Helper.okToUse(fProposalTable)) { fAdditionalInfoController.install(fProposalTable); fAdditionalInfoController.handleTableSelectionChanged(); } } else hide(); } /** * Installs the document listener if not already done. * * @since 3.2 */ private void ensureDocumentListenerInstalled() { if (fDocumentListener == null) { fDocumentListener = new IDocumentListener() { public void documentAboutToBeChanged(DocumentEvent event) { if (!fInserting) fDocumentEvents.add(event); } public void documentChanged(DocumentEvent event) { if (!fInserting) filterProposals(); } }; IDocument document = fContentAssistSubjectControlAdapter.getDocument(); if (document != null) document.addDocumentListener(fDocumentListener); } } /* * @see IContentAssistListener#verifyKey(VerifyEvent) */ public boolean verifyKey(VerifyEvent e) { if (!Helper.okToUse(fProposalShell)) return true; char key = e.character; if (key == 0) { int newSelection = fProposalTable.getSelectionIndex(); int visibleRows = (fProposalTable.getSize().y / fProposalTable.getItemHeight()) - 1; int itemCount = fProposalTable.getItemCount(); switch (e.keyCode) { case SWT.ARROW_LEFT: case SWT.ARROW_RIGHT: filterProposals(); return true; case SWT.ARROW_UP: newSelection -= 1; if (newSelection < 0) newSelection = itemCount - 1; break; case SWT.ARROW_DOWN: newSelection += 1; if (newSelection > itemCount - 1) newSelection = 0; break; case SWT.PAGE_DOWN: newSelection += visibleRows; if (newSelection >= itemCount) newSelection = itemCount - 1; break; case SWT.PAGE_UP: newSelection -= visibleRows; if (newSelection < 0) newSelection = 0; break; /* * case SWT.HOME : newSelection= 0; break; * * case SWT.END : newSelection= itemCount - 1; break; */ default: if (e.keyCode != SWT.CAPS_LOCK && e.keyCode != SWT.MOD1 && e.keyCode != SWT.MOD2 && e.keyCode != SWT.MOD3 && e.keyCode != SWT.MOD4) hide(); return true; } selectProposal(newSelection, (e.stateMask & SWT.CTRL) != 0); e.doit = false; return false; } // key != 0 switch (key) { case 0x1B: // Esc e.doit = false; hide(); break; case '\n': // Ctrl-Enter on w2k case '\r': // Enter case '\t': // 2017年6月7日09时52分00秒 6 Add e.doit = false; insertSelectedProposalWithMask(e.stateMask); break; /* * case '\t': e.doit= false; fProposalShell.setFocus(); return false; */ default: ICompletionProposal p = getSelectedProposal(); if (p instanceof ICompletionProposalExtension) { ICompletionProposalExtension t = (ICompletionProposalExtension) p; char[] triggers = t.getTriggerCharacters(); if (key != 0x20 && key != '=' && key != ';' && contains(triggers, key)) { // if (contains(triggers, key)) { e.doit = false; hide(); insertProposal(p, key, e.stateMask, fContentAssistSubjectControlAdapter.getSelectedRange().x); } } } return true; } /** * Selects the entry with the given index in the proposal selector and feeds * the selection to the additional info controller. * * @param index * the index in the list * @param smartToggle * <code>true</code> if the smart toggle key has been pressed * @since 2.1 */ private void selectProposal(int index, boolean smartToggle) { ICompletionProposal oldProposal = getSelectedProposal(); if (oldProposal instanceof ICompletionProposalExtension2 && fViewer != null) ((ICompletionProposalExtension2) oldProposal).unselected(fViewer); if (fFilteredProposals == null) { fireSelectionEvent(null, smartToggle); return; } ICompletionProposal proposal = fFilteredProposals[index]; if (proposal instanceof ICompletionProposalExtension2 && fViewer != null) ((ICompletionProposalExtension2) proposal).selected(fViewer, smartToggle); fireSelectionEvent(proposal, smartToggle); fLastProposal = proposal; fProposalTable.setSelection(index); fProposalTable.showSelection(); if (fAdditionalInfoController != null) fAdditionalInfoController.handleTableSelectionChanged(); } /** * Fires a selection event, see {@link ICompletionListener}. * * @param proposal * the selected proposal, possibly <code>null</code> * @param smartToggle * true if the smart toggle is on * @since 3.2 */ private void fireSelectionEvent(ICompletionProposal proposal, boolean smartToggle) { fContentAssistant.fireSelectionEvent(proposal, smartToggle); } /** * Returns whether the given character is contained in the given array of * characters. * * @param characters * the list of characters * @param c * the character to look for in the list * @return <code>true</code> if character belongs to the list * @since 2.0 */ private boolean contains(char[] characters, char c) { if (characters == null) return false; for (int i = 0; i < characters.length; i++) { if (c == characters[i]) return true; } return false; } /* * @see IEventConsumer#processEvent(VerifyEvent) */ public void processEvent(VerifyEvent e) { } /** * Filters the displayed proposal based on the given cursor position and the * offset of the original invocation of the content assistant. */ private void filterProposals() { if (!fIsFilterPending) { fIsFilterPending = true; Control control = fContentAssistSubjectControlAdapter.getControl(); control.getDisplay().asyncExec(fFilterRunnable); } } /** * Computes the subset of already computed proposals that are still valid * for the given offset. * * @param offset * the offset * @param event * the merged document event * @return the set of filtered proposals * @since 3.0 */ private ICompletionProposal[] computeFilteredProposals(int offset, DocumentEvent event) { if (offset == fInvocationOffset && event == null) { fIsFilteredSubset = false; return fComputedProposals; } if (offset < fInvocationOffset) { fIsFilteredSubset = false; fInvocationOffset = offset; fContentAssistant.fireSessionRestartEvent(); fComputedProposals = computeProposals(fInvocationOffset); return fComputedProposals; } ICompletionProposal[] proposals; if (offset < fFilterOffset) { proposals = fComputedProposals; fIsFilteredSubset = false; } else { proposals = fFilteredProposals; fIsFilteredSubset = true; } if (proposals == null) { fIsFilteredSubset = false; return null; } IDocument document = fContentAssistSubjectControlAdapter.getDocument(); int length = proposals.length; List filtered = new ArrayList(length); for (int i = 0; i < length; i++) { if (proposals[i] instanceof ICompletionProposalExtension2) { ICompletionProposalExtension2 p = (ICompletionProposalExtension2) proposals[i]; if (p.validate(document, offset, event)) filtered.add(p); } else if (proposals[i] instanceof ICompletionProposalExtension) { ICompletionProposalExtension p = (ICompletionProposalExtension) proposals[i]; if (p.isValidFor(document, offset)) filtered.add(p); } else { // restore original behavior fIsFilteredSubset = false; fInvocationOffset = offset; fContentAssistant.fireSessionRestartEvent(); fComputedProposals = computeProposals(fInvocationOffset); return fComputedProposals; } } return (ICompletionProposal[]) filtered.toArray(new ICompletionProposal[filtered.size()]); } /** * Requests the proposal shell to take focus. * * @since 3.0 */ public void setFocus() { if (Helper.okToUse(fProposalShell)) { fProposalShell.setFocus(); } } /** * Returns <code>true</code> if <code>proposal</code> should be * auto-inserted, <code>false</code> otherwise. * * @param proposal * the single proposal that might be automatically inserted * @return <code>true</code> if <code>proposal</code> can be inserted * automatically, <code>false</code> otherwise * @since 3.1 */ private boolean canAutoInsert(ICompletionProposal proposal) { if (fContentAssistant.isAutoInserting()) { if (proposal instanceof ICompletionProposalExtension4) { ICompletionProposalExtension4 ext = (ICompletionProposalExtension4) proposal; return ext.isAutoInsertable(); } return true; // default behavior before // ICompletionProposalExtension4 was introduced } return false; } /** * Completes the common prefix of all proposals directly in the code. If no * common prefix can be found, the proposal popup is shown. * * @return an error message if completion failed. * @since 3.0 */ public String incrementalComplete() { if (Helper.okToUse(fProposalShell) && fFilteredProposals != null) { if (fLastCompletionOffset == fFilterOffset) { handleRepeatedInvocation(); } else { fLastCompletionOffset = fFilterOffset; completeCommonPrefix(); } } else { final Control control = fContentAssistSubjectControlAdapter.getControl(); if (fKeyListener == null) fKeyListener = new ProposalSelectionListener(); if (!Helper.okToUse(fProposalShell) && !control.isDisposed()) fContentAssistSubjectControlAdapter.addKeyListener(fKeyListener); BusyIndicator.showWhile(control.getDisplay(), new Runnable() { public void run() { fInvocationOffset = fContentAssistSubjectControlAdapter.getSelectedRange().x; fFilterOffset = fInvocationOffset; fLastCompletionOffset = fFilterOffset; fFilteredProposals = computeProposals(fInvocationOffset); int count = (fFilteredProposals == null ? 0 : fFilteredProposals.length); if (count == 0 && hideWhenNoProposals(false)) return; if (count == 1 && canAutoInsert(fFilteredProposals[0])) { insertProposal(fFilteredProposals[0], (char) 0, 0, fInvocationOffset); hide(); } else { ensureDocumentListenerInstalled(); if (count > 0 && completeCommonPrefix()) hide(); else { fComputedProposals = fFilteredProposals; createProposalSelector(); setProposals(fComputedProposals, false); displayProposals(); } } } }); } return getErrorMessage(); } /** * Acts upon <code>fFilteredProposals</code>: if there is just one valid * proposal, it is inserted, otherwise, the common prefix of all proposals * is inserted into the document. If there is no common prefix, nothing * happens and <code>false</code> is returned. * * @return <code>true</code> if a single proposal was inserted and the * selector can be closed, <code>false</code> otherwise * @since 3.0 */ private boolean completeCommonPrefix() { // 0: insert single proposals if (fFilteredProposals.length == 1) { if (canAutoInsert(fFilteredProposals[0])) { insertProposal(fFilteredProposals[0], (char) 0, 0, fFilterOffset); hide(); return true; } return false; } // 1: extract pre- and postfix from all remaining proposals IDocument document = fContentAssistSubjectControlAdapter.getDocument(); // contains the common postfix in the case that there are any proposals // matching our LHS StringBuffer rightCasePostfix = null; List rightCase = new ArrayList(); boolean isWrongCaseMatch = false; // the prefix of all case insensitive matches. This differs from the // document // contents and will be replaced. CharSequence wrongCasePrefix = null; int wrongCasePrefixStart = 0; // contains the common postfix of all case-insensitive matches StringBuffer wrongCasePostfix = null; List wrongCase = new ArrayList(); for (int i = 0; i < fFilteredProposals.length; i++) { ICompletionProposal proposal = fFilteredProposals[i]; if (!(proposal instanceof ICompletionProposalExtension3)) return false; int start = ((ICompletionProposalExtension3) proposal).getPrefixCompletionStart(fContentAssistSubjectControlAdapter.getDocument(), fFilterOffset); CharSequence insertion = ((ICompletionProposalExtension3) proposal).getPrefixCompletionText(fContentAssistSubjectControlAdapter.getDocument(), fFilterOffset); if (insertion == null) insertion = TextProcessor.deprocess(proposal.getDisplayString()); try { int prefixLength = fFilterOffset - start; int relativeCompletionOffset = Math.min(insertion.length(), prefixLength); String prefix = document.get(start, prefixLength); if (!isWrongCaseMatch && insertion.toString().startsWith(prefix)) { isWrongCaseMatch = false; rightCase.add(proposal); CharSequence newPostfix = insertion.subSequence(relativeCompletionOffset, insertion.length()); if (rightCasePostfix == null) rightCasePostfix = new StringBuffer(newPostfix.toString()); else truncatePostfix(rightCasePostfix, newPostfix); } else if (i == 0 || isWrongCaseMatch) { CharSequence newPrefix = insertion.subSequence(0, relativeCompletionOffset); if (isPrefixCompatible(wrongCasePrefix, wrongCasePrefixStart, newPrefix, start, document)) { isWrongCaseMatch = true; wrongCasePrefix = newPrefix; wrongCasePrefixStart = start; CharSequence newPostfix = insertion.subSequence(relativeCompletionOffset, insertion.length()); if (wrongCasePostfix == null) wrongCasePostfix = new StringBuffer(newPostfix.toString()); else truncatePostfix(wrongCasePostfix, newPostfix); wrongCase.add(proposal); } else { return false; } } else return false; } catch (BadLocationException e2) { // bail out silently return false; } if (rightCasePostfix != null && rightCasePostfix.length() == 0 && rightCase.size() > 1) return false; } // 2: replace single proposals if (rightCase.size() == 1) { ICompletionProposal proposal = (ICompletionProposal) rightCase.get(0); if (canAutoInsert(proposal) && rightCasePostfix.length() > 0) { insertProposal(proposal, (char) 0, 0, fInvocationOffset); hide(); return true; } return false; } else if (isWrongCaseMatch && wrongCase.size() == 1) { ICompletionProposal proposal = (ICompletionProposal) wrongCase.get(0); if (canAutoInsert(proposal)) { insertProposal(proposal, (char) 0, 0, fInvocationOffset); hide(); return true; } return false; } // 3: replace post- / prefixes CharSequence prefix; if (isWrongCaseMatch) prefix = wrongCasePrefix; else prefix = ""; //$NON-NLS-1$ CharSequence postfix; if (isWrongCaseMatch) postfix = wrongCasePostfix; else postfix = rightCasePostfix; if (prefix == null || postfix == null) return false; try { // 4: check if parts of the postfix are already in the document int to = Math.min(document.getLength(), fFilterOffset + postfix.length()); StringBuffer inDocument = new StringBuffer(document.get(fFilterOffset, to - fFilterOffset)); truncatePostfix(inDocument, postfix); // 5: replace and reveal document.replace(fFilterOffset - prefix.length(), prefix.length() + inDocument.length(), prefix.toString() + postfix.toString()); fContentAssistSubjectControlAdapter.setSelectedRange(fFilterOffset + postfix.length(), 0); fContentAssistSubjectControlAdapter.revealRange(fFilterOffset + postfix.length(), 0); fFilterOffset += postfix.length(); fLastCompletionOffset = fFilterOffset; return false; } catch (BadLocationException e) { // ignore and return false return false; } } /* * @since 3.1 */ private boolean isPrefixCompatible(CharSequence oneSequence, int oneOffset, CharSequence twoSequence, int twoOffset, IDocument document) throws BadLocationException { if (oneSequence == null || twoSequence == null) return true; int min = Math.min(oneOffset, twoOffset); int oneEnd = oneOffset + oneSequence.length(); int twoEnd = twoOffset + twoSequence.length(); String one = document.get(oneOffset, min - oneOffset) + oneSequence + document.get(oneEnd, Math.min(fFilterOffset, fFilterOffset - oneEnd)); String two = document.get(twoOffset, min - twoOffset) + twoSequence + document.get(twoEnd, Math.min(fFilterOffset, fFilterOffset - twoEnd)); return one.equals(two); } /** * Truncates <code>buffer</code> to the common prefix of <code>buffer</code> * and <code>sequence</code>. * * @param buffer * the common postfix to truncate * @param sequence * the characters to truncate with */ private void truncatePostfix(StringBuffer buffer, CharSequence sequence) { // find common prefix int min = Math.min(buffer.length(), sequence.length()); for (int c = 0; c < min; c++) { if (sequence.charAt(c) != buffer.charAt(c)) { buffer.delete(c, buffer.length()); return; } } // all equal up to minimum buffer.delete(min, buffer.length()); } /** * Sets the message for the repetition affordance text at the bottom of the * proposal. Only has an effect if * {@link ContentAssistant#isRepeatedInvocationMode()} returns * <code>true</code>. * * @param message * the new caption * @since 3.2 */ void setMessage(String message) { Assert.isNotNull(message); if (isActive() && fMessageText != null) fMessageText.setText(message + " "); //$NON-NLS-1$ } /** * Sets the text to be displayed if no proposals are available. Only has an * effect if {@link ContentAssistant#isShowEmptyList()} returns * <code>true</code>. * * @param message * the empty message * @since 3.2 */ void setEmptyMessage(String message) { Assert.isNotNull(message); fEmptyMessage = message; } /** * Enables or disables showing of the caption line. See also * {@link #setMessage(String)}. * * @param show * <code>true</code> if the status line is visible * @since 3.2 */ public void setStatusLineVisible(boolean show) { if (!isActive() || show == (fMessageText != null)) return; // nothing to do if (show) { createMessageText(); } else { fMessageText.dispose(); fMessageText = null; } fProposalShell.layout(); } /** * Informs the popup that it is being placed above the caret line instead of * below. * * @param above * <code>true</code> if the location of the popup is above the * caret line, <code>false</code> if it is below * @since 3.3 */ void switchedPositionToAbove(boolean above) { if (fAdditionalInfoController != null) { fAdditionalInfoController.setFallbackAnchors(new Anchor[] { AbstractInformationControlManager.ANCHOR_RIGHT, AbstractInformationControlManager.ANCHOR_LEFT, above ? AbstractInformationControlManager.ANCHOR_TOP : AbstractInformationControlManager.ANCHOR_BOTTOM }); } } /** * Returns a new proposal selection handler. * * @param operationCode * the operation code * @return the handler * @since 3.4 */ IHandler createProposalSelectionHandler(int operationCode) { return new ProposalSelectionHandler(operationCode); } }
下载 jre 1.4 后，复制到 C:\Program Files\Java\jre1.4.2 目录下，然后在 eclipse 项目属性中 Configure Build Path -> Libraries 选项卡下
Add Library -> JRE System Library -> Alternate JRE 选择 1.4.2 版本 然后 Installed JREs... -> Add -> Standard VM -> Directory...
找到 C:\Program Files\Java\jre1.4.2 目录，其余选项会被自动完成，这时候就添加 jre 成功了。
