true if a compound move / copy is going on. */
+ private boolean fEditInProgress= false;
+ /** The exit strategy that will detect the ending of a compound edit */
+ private final CompoundEditExitStrategy fExitStrategy;
+
+ public SharedState(CompilationUnitEditor editor) {
+ fEditor= editor;
+ fExitStrategy= new CompoundEditExitStrategy(new String[] {ITextEditorActionDefinitionIds.MOVE_LINES_UP, ITextEditorActionDefinitionIds.MOVE_LINES_DOWN, ITextEditorActionDefinitionIds.COPY_LINES_UP, ITextEditorActionDefinitionIds.COPY_LINES_DOWN});
+ fExitStrategy.addCompoundListener(new ICompoundEditListener() {
+ public void endCompoundEdit() {
+ SharedState.this.endCompoundEdit();
+ }
+ });
+ }
+
+ /**
+ * Ends the compound change.
+ */
+ public void beginCompoundEdit() {
+ if (fEditInProgress || fEditor == null)
+ return;
+
+ fEditInProgress= true;
+
+ fExitStrategy.arm(fEditor.getViewer());
+
+ IRewriteTarget target= (IRewriteTarget)fEditor.getAdapter(IRewriteTarget.class);
+ if (target != null) {
+ target.beginCompoundChange();
+ }
+ }
+ /**
+ * Ends the compound change.
+ */
+ public void endCompoundEdit() {
+ if (!fEditInProgress || fEditor == null)
+ return;
+
+ fExitStrategy.disarm();
+
+ IRewriteTarget target= (IRewriteTarget)fEditor.getAdapter(IRewriteTarget.class);
+ if (target != null) {
+ target.endCompoundChange();
+ }
+
+ fResult= null;
+ fEditInProgress= false;
+ }
+ }
+
+ /* keys */
+
+ /** Key for status message upon illegal move. Value {@value}
*/ + + /* state variables - define what this action does */ + + /**true if lines are shifted upwards, false otherwise. */
+ private final boolean fUpwards;
+ /** true if lines are to be copied instead of moved. */
+ private final boolean fCopy;
+ /** The shared state of the move/copy action quadruple. */
+ private final SharedState fSharedState;
+
+ /**
+ * Creates the quadruple of move and copy actions. The returned array contains
+ * the actions in the following order:
+ * [0] move up
+ * [1] move down
+ * [2] copy up (duplicate)
+ * [3] copy down (duplicate & select)
+ * @param bundle the resource bundle
+ * @param editor the editor
+ * @return the quadruple of actions
+ */
+ public static JavaMoveLinesAction[] createMoveCopyActionSet(ResourceBundle bundle, CompilationUnitEditor editor) {
+ SharedState state= new SharedState(editor);
+ JavaMoveLinesAction[] actions= new JavaMoveLinesAction[4];
+ actions[0]= new JavaMoveLinesAction(bundle, "Editor.MoveLinesUp.", true, false, state); //$NON-NLS-1$
+ actions[1]= new JavaMoveLinesAction(bundle, "Editor.MoveLinesDown.", false, false, state); //$NON-NLS-1$
+ actions[2]= new JavaMoveLinesAction(bundle, "Editor.CopyLineUp.", true, true, state); //$NON-NLS-1$
+ actions[3]= new JavaMoveLinesAction(bundle, "Editor.CopyLineDown.", false, true, state); //$NON-NLS-1$
+ return actions;
+ }
+
+ /*
+ * @see org.eclipse.ui.texteditor.TextEditorAction#setEditor(org.eclipse.ui.texteditor.ITextEditor)
+ */
+ @Override
+ public void setEditor(ITextEditor editor) {
+ Assert.isTrue(editor instanceof CompilationUnitEditor);
+ super.setEditor(editor);
+ if (fSharedState != null)
+ fSharedState.fEditor= (CompilationUnitEditor) editor;
+ }
+
+ /**
+ * Creates and initializes the action for the given text editor.
+ * The action configures its visual representation from the given resource
+ * bundle.
+ *
+ * @param bundle the resource bundle
+ * @param prefix a prefix to be prepended to the various resource keys
+ * (described in ResourceAction constructor), or null if none
+ * @param upwards trueif the selected lines should be moved upwards,
+ * false if downwards
+ * @param copy if true, the action will copy lines instead of moving them
+ * @param state the shared state
+ * @see TextEditorAction#TextEditorAction(ResourceBundle, String, ITextEditor)
+ */
+ private JavaMoveLinesAction(ResourceBundle bundle, String prefix, boolean upwards, boolean copy, SharedState state) {
+ super(bundle, prefix, state.fEditor);
+ fUpwards= upwards;
+ fCopy= copy;
+ fSharedState= state;
+ update();
+ }
+
+ /**
+ * Checks if selection is contained by the visible region of viewer.
+ * As a special case, a selection is considered contained even if it extends over the visible
+ * region, but the extension stays on a partially contained line and contains only white space.
+ *
+ * @param selection the selection to be checked
+ * @param viewer the viewer displaying a visible region of selection's document.
+ * @return true, if selection is contained, false otherwise.
+ */
+ private boolean containedByVisibleRegion(ITextSelection selection, ISourceViewer viewer) {
+ int min= selection.getOffset();
+ int max= min + selection.getLength();
+ IDocument document= viewer.getDocument();
+
+ IRegion visible;
+ if (viewer instanceof ITextViewerExtension5)
+ visible= ((ITextViewerExtension5) viewer).getModelCoverage();
+ else
+ visible= viewer.getVisibleRegion();
+
+ int visOffset= visible.getOffset();
+ try {
+ if (visOffset > min) {
+ if (document.getLineOfOffset(visOffset) != selection.getStartLine())
+ return false;
+ if (!isWhitespace(document.get(min, visOffset - min))) {
+ showStatus();
+ return false;
+ }
+ }
+ int visEnd= visOffset + visible.getLength();
+ if (visEnd < max) {
+ if (document.getLineOfOffset(visEnd) != selection.getEndLine())
+ return false;
+ if (!isWhitespace(document.get(visEnd, max - visEnd))) {
+ showStatus();
+ return false;
+ }
+ }
+ return true;
+ } catch (BadLocationException e) {
+ }
+ return false;
+ }
+
+ /**
+ * Given a selection on a document, computes the lines fully or partially covered by
+ * selection. A line in the document is considered covered if
+ * selection comprises any characters on it, including the terminating delimiter.
+ * Note that the last line in a selection is not considered covered if the selection only + * comprises the line delimiter at its beginning (that is considered part of the second last + * line). + * As a special case, if the selection is empty, a line is considered covered if the caret is + * at any position in the line, including between the delimiter and the start of the line. The + * line containing the delimiter is not considered covered in that case. + *
+ * + * @param document the documentselection refers to
+ * @param selection a selection on document
+ * @param viewer the ISourceViewer displaying document
+ * @return a selection describing the range of lines (partially) covered by
+ * selection, without any terminating line delimiters
+ * @throws BadLocationException if the selection is out of bounds (when the underlying document has changed during the call)
+ */
+ private ITextSelection getMovingSelection(IDocument document, ITextSelection selection, ISourceViewer viewer) throws BadLocationException {
+ int low= document.getLineOffset(selection.getStartLine());
+ int endLine= selection.getEndLine();
+ int high= document.getLineOffset(endLine) + document.getLineLength(endLine);
+
+ // get everything up to last line without its delimiter
+ String delim= document.getLineDelimiter(endLine);
+ if (delim != null)
+ high -= delim.length();
+
+ return new TextSelection(document, low, high - low);
+ }
+
+ /**
+ * Computes the region of the skipped line given the text block to be moved. If
+ * fUpwards is true, the line above selection
+ * is selected, otherwise the line below.
+ *
+ * @param document the document selection refers to
+ * @param selection the selection on document that will be moved.
+ * @return the region comprising the line that selection will be moved over, without its terminating delimiter.
+ */
+ private ITextSelection getSkippedLine(IDocument document, ITextSelection selection) {
+ int skippedLineN= (fUpwards ? selection.getStartLine() - 1 : selection.getEndLine() + 1);
+ if (skippedLineN > document.getNumberOfLines() || (!fCopy && (skippedLineN < 0 || skippedLineN == document.getNumberOfLines())))
+ return null;
+ try {
+ if (fCopy && skippedLineN == -1)
+ skippedLineN= 0;
+ IRegion line= document.getLineInformation(skippedLineN);
+ return new TextSelection(document, line.getOffset(), line.getLength());
+ } catch (BadLocationException e) {
+ // only happens on concurrent modifications
+ return null;
+ }
+ }
+
+ /**
+ * Checks for white space in a string.
+ *
+ * @param string the string to be checked or null
+ * @return true if string contains only white space or is
+ * null, false otherwise
+ */
+ private boolean isWhitespace(String string) {
+ return string == null ? true : string.trim().length() == 0;
+ }
+
+ /*
+ * @see org.eclipse.jface.action.IAction#run()
+ */
+ @Override
+ public void runWithEvent(Event event) {
+
+ // get involved objects
+ if (fSharedState.fEditor == null)
+ return;
+
+ if (!validateEditorInputState())
+ return;
+
+ ISourceViewer viewer= fSharedState.fEditor.getViewer();
+ if (viewer == null)
+ return;
+
+ IDocument document= viewer.getDocument();
+ if (document == null)
+ return;
+
+ StyledText widget= viewer.getTextWidget();
+ if (widget == null)
+ return;
+
+ // get selection
+ ITextSelection sel= (ITextSelection) viewer.getSelectionProvider().getSelection();
+ if (sel.isEmpty())
+ return;
+
+ ITextSelection skippedLine= getSkippedLine(document, sel);
+ if (skippedLine == null)
+ return;
+
+ try {
+
+ ITextSelection movingArea= getMovingSelection(document, sel, viewer);
+
+ // if either the skipped line or the moving lines are outside the widget's
+ // visible area, bail out
+ if (!containedByVisibleRegion(movingArea, viewer) || !containedByVisibleRegion(skippedLine, viewer))
+ return;
+
+ // get the content to be moved around: the moving (selected) area and the skipped line
+ String moving= movingArea.getText();
+ String skipped= skippedLine.getText();
+ if (moving == null || skipped == null || document.getLength() == 0)
+ return;
+
+ String delim;
+ String insertion;
+ int offset;
+ if (fUpwards) {
+ delim= document.getLineDelimiter(skippedLine.getEndLine());
+ if (fCopy) {
+ delim= TextUtilities.getDefaultLineDelimiter(document);
+ insertion= moving + delim;
+ offset= movingArea.getOffset();
+ } else {
+ Assert.isNotNull(delim);
+ insertion= moving + delim + skipped;
+ offset= skippedLine.getOffset();
+ }
+ } else {
+ delim= document.getLineDelimiter(movingArea.getEndLine());
+ if (fCopy) {
+ if (delim == null) {
+ delim= TextUtilities.getDefaultLineDelimiter(document);
+ insertion= delim + moving;
+ } else
+ insertion= moving + delim;
+ offset= skippedLine.getOffset();
+ } else {
+ Assert.isNotNull(delim);
+ insertion= skipped + delim + moving;
+ offset= movingArea.getOffset();
+ }
+ }
+ int lenght= fCopy ? 0 : insertion.length();
+
+ // modify the document
+ ILineRange selectionBefore= getLineRange(document, movingArea);
+
+ if (fCopy)
+ fSharedState.endCompoundEdit();
+ fSharedState.beginCompoundEdit();
+
+ document.replace(offset, lenght, insertion);
+
+ ILineRange selectionAfter;
+ if (fUpwards && fCopy)
+ selectionAfter= selectionBefore;
+ else if (fUpwards)
+ selectionAfter= new LineRange(selectionBefore.getStartLine() - 1, selectionBefore.getNumberOfLines());
+ else if (fCopy)
+ selectionAfter= new LineRange(selectionBefore.getStartLine() + selectionBefore.getNumberOfLines(), selectionBefore.getNumberOfLines());
+ else
+ selectionAfter= new LineRange(selectionBefore.getStartLine() + 1, selectionBefore.getNumberOfLines());
+
+ fSharedState.fResult= IndentUtil.indentLines(document, selectionAfter, getProject(), fSharedState.fResult);
+
+ // move the selection along
+ IRegion region= getRegion(document, selectionAfter);
+ selectAndReveal(viewer, region.getOffset(), region.getLength());
+
+ } catch (BadLocationException x) {
+ // won't happen without concurrent modification - bail out
+ return;
+ } finally {
+ if (fCopy)
+ fSharedState.endCompoundEdit();
+ }
+ }
+
+ private IJavaProject getProject() {
+ IEditorInput editorInput= fSharedState.fEditor.getEditorInput();
+ ICompilationUnit unit= JavaPlugin.getDefault().getWorkingCopyManager().getWorkingCopy(editorInput);
+ if (unit != null)
+ return unit.getJavaProject();
+ return null;
+ }
+
+ private ILineRange getLineRange(IDocument document, ITextSelection selection) throws BadLocationException {
+ final int offset= selection.getOffset();
+ int startLine= document.getLineOfOffset(offset);
+ int endOffset= offset + selection.getLength();
+ int endLine= document.getLineOfOffset(endOffset);
+ final int nLines= endLine - startLine + 1;
+ return new LineRange(startLine, nLines);
+ }
+
+ private IRegion getRegion(IDocument document, ILineRange lineRange) throws BadLocationException {
+ final int startLine= lineRange.getStartLine();
+ int offset= document.getLineOffset(startLine);
+ final int numberOfLines= lineRange.getNumberOfLines();
+ if (numberOfLines < 1)
+ return new Region(offset, 0);
+ int endLine= startLine + numberOfLines - 1;
+ int endOffset;
+ if (fSharedState.fEditor.isBlockSelectionModeEnabled()) {
+ // in block selection mode, don't select the last delimiter as we count an empty selected line
+ IRegion endLineInfo= document.getLineInformation(endLine);
+ endOffset= endLineInfo.getOffset() + endLineInfo.getLength();
+ } else {
+ endOffset= document.getLineOffset(endLine) + document.getLineLength(endLine);
+ }
+ return new Region(offset, endOffset - offset);
+ }
+
+ /**
+ * Performs similar to AbstractTextEditor.selectAndReveal, but does not update
+ * the viewers highlight area.
+ *
+ * @param viewer the viewer that we want to select on
+ * @param offset the offset of the selection
+ * @param length the length of the selection
+ */
+ private void selectAndReveal(ITextViewer viewer, int offset, int length) {
+ // invert selection to avoid jumping to the end of the selection in st.showSelection()
+ viewer.setSelectedRange(offset + length, -length);
+ //viewer.revealRange(offset, length); // will trigger jumping
+ StyledText st= viewer.getTextWidget();
+ if (st != null)
+ st.showSelection(); // only minimal scrolling
+ }
+
+ /**
+ * Displays information in the status line why a line move is not possible
+ */
+ private void showStatus() {
+ IEditorStatusLine status= (IEditorStatusLine) fSharedState.fEditor.getAdapter(IEditorStatusLine.class);
+ if (status == null)
+ return;
+ status.setMessage(false, JavaEditorMessages.Editor_MoveLines_IllegalMove_status, null);
+ }
+
+ /*
+ * @see org.eclipse.ui.texteditor.IUpdate#update()
+ */
+ @Override
+ public void update() {
+ super.update();
+
+ if (isEnabled())
+ setEnabled(canModifyEditor());
+
+ }
+}