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package org.eclipse.fx.text.ui;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.fx.ui.controls.styledtext.StyledTextArea;
import org.eclipse.fx.ui.controls.styledtext.TextSelection;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.Region;
import org.eclipse.text.undo.DocumentUndoEvent;
import org.eclipse.text.undo.DocumentUndoManagerRegistry;
import org.eclipse.text.undo.IDocumentUndoListener;
import org.eclipse.text.undo.IDocumentUndoManager;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseEvent;
public class DefaultUndoManager implements IUndoManager {
private IDocument fDocument;
private IDocumentUndoManager fDocumentUndoManager;
private ITextViewer fTextViewer;
private int fUndoLevel;
public DefaultUndoManager(int undoLevel) {
this.fUndoLevel = undoLevel;
}
private boolean isConnected() {
return fTextViewer != null && fDocumentUndoManager != null;
}
private void onKeyPressed(KeyEvent e) {
switch(e.getCode()) {
case UP:
case DOWN:
case LEFT:
case RIGHT:
if (isConnected()) {
fDocumentUndoManager.commit();
}
break;
}
}
private void onMousePressed(MouseEvent e) {
if (e.getClickCount() == 1) {
if (isConnected()) {
fDocumentUndoManager.commit();
}
}
}
private ITextInputListener fTextInputListener = new ITextInputListener() {
@Override
public void inputDocumentChanged(IDocument oldInput, IDocument newInput) {
connectDocumentUndoManager(newInput);
}
@Override
public void inputDocumentAboutToBeChanged(IDocument oldInput, IDocument newInput) {
disconnectDocumentUndoManager();
}
};
private IDocumentUndoListener fDocumentUndoListener = new IDocumentUndoListener() {
@Override
public void documentUndoNotification(DocumentUndoEvent event ){
if (!isConnected()) return;
int eventType= event.getEventType();
if (((eventType & DocumentUndoEvent.ABOUT_TO_UNDO) != 0) || ((eventType & DocumentUndoEvent.ABOUT_TO_REDO) != 0)) {
if (event.isCompound()) {
// ITextViewerExtension extension= null;
// if (fTextViewer instanceof ITextViewerExtension)
// extension= (ITextViewerExtension) fTextViewer;
//
// if (extension != null)
// extension.setRedraw(false);
}
// TODO turn of auto edit strategies
// fTextViewer.getTextWidget().getDisplay().syncExec(new Runnable() {
// @Override
// public void run() {
// if (fTextViewer instanceof TextViewer)
// ((TextViewer)fTextViewer).ignoreAutoEditStrategies(true);
// }
// });
} else if (((eventType & DocumentUndoEvent.UNDONE) != 0) || ((eventType & DocumentUndoEvent.REDONE) != 0)) {
// TODO turn on auto edit strategies
// fTextViewer.getTextWidget().getDisplay().syncExec(new Runnable() {
// @Override
// public void run() {
// if (fTextViewer instanceof TextViewer)
// ((TextViewer)fTextViewer).ignoreAutoEditStrategies(false);
// }
// });
if (event.isCompound()) {
// ITextViewerExtension extension= null;
// if (fTextViewer instanceof ITextViewerExtension)
// extension= (ITextViewerExtension) fTextViewer;
//
// if (extension != null)
// extension.setRedraw(true);
}
// Reveal the change if this manager's viewer has the focus.
if (fTextViewer != null) {
StyledTextArea widget= fTextViewer.getTextWidget();
// TODO select?
// if (widget != null && !widget.isDisposed() && (widget.isFocusControl()))// || fTextViewer.getTextWidget() == control))
selectAndReveal(event.getOffset(), event.getText() == null ? 0 : event.getText().length());
}
}
}
};
/**
* Selects and reveals the specified range.
*
* @param offset the offset of the range
* @param length the length of the range
*/
private void selectAndReveal(int offset, int length) {
if (fTextViewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension= (ITextViewerExtension5) fTextViewer;
extension.exposeModelRange(new Region(offset, length));
} else if (!fTextViewer.overlapsWithVisibleRegion(offset, length))
fTextViewer.resetVisibleRegion();
fTextViewer.getTextWidget().setSelection(new TextSelection(offset, length));
// fTextViewer.revealRange(offset, length);
}
private void connectDocumentUndoManager(IDocument document) {
disconnectDocumentUndoManager();
if (document != null) {
fDocument= document;
DocumentUndoManagerRegistry.connect(fDocument);
fDocumentUndoManager= DocumentUndoManagerRegistry.getDocumentUndoManager(fDocument);
fDocumentUndoManager.connect(this);
setMaximalUndoLevel(fUndoLevel);
fDocumentUndoManager.addDocumentUndoListener(fDocumentUndoListener);
}
}
private void disconnectDocumentUndoManager() {
if (fDocumentUndoManager != null) {
fDocumentUndoManager.disconnect(this);
fDocumentUndoManager.removeDocumentUndoListener(fDocumentUndoListener);
fDocumentUndoListener= null;
fDocumentUndoManager= null;
}
}
@Override
public void connect(ITextViewer viewer) {
this.fTextViewer = viewer;
this.fTextViewer.getTextWidget().addEventHandler(MouseEvent.MOUSE_PRESSED, this::onMousePressed);
this.fTextViewer.getTextWidget().addEventHandler(KeyEvent.KEY_PRESSED, this::onKeyPressed);
this.fTextViewer.addTextInputListener(this.fTextInputListener);
connectDocumentUndoManager(fTextViewer.getDocument());
}
@Override
public void disconnect() {
this.fTextViewer.getTextWidget().removeEventHandler(MouseEvent.MOUSE_PRESSED, this::onMousePressed);
this.fTextViewer.getTextWidget().removeEventHandler(KeyEvent.KEY_PRESSED, this::onKeyPressed);
this.fTextViewer.removeTextInputListener(this.fTextInputListener);
this.fTextViewer = null;
disconnectDocumentUndoManager();
}
@Override
public void beginCompoundChange() {
if (isConnected()) {
fDocumentUndoManager.beginCompoundChange();
}
}
@Override
public void endCompoundChange() {
if (isConnected()) {
fDocumentUndoManager.endCompoundChange();
}
}
@Override
public void reset() {
if (isConnected())
fDocumentUndoManager.reset();
}
@Override
public void setMaximalUndoLevel(int undoLevel) {
fUndoLevel= Math.max(0, undoLevel);
if (isConnected()) {
fDocumentUndoManager.setMaximalUndoLevel(fUndoLevel);
}
}
@Override
public boolean undoable() {
if (isConnected())
return fDocumentUndoManager.undoable();
return false;
}
@Override
public boolean redoable() {
if (isConnected())
return fDocumentUndoManager.redoable();
return false;
}
@Override
public void undo() {
if (isConnected()) {
try {
fDocumentUndoManager.undo();
} catch (ExecutionException ex) {
ex.printStackTrace();
// openErrorDialog(JFaceTextMessages.getString("DefaultUndoManager.error.undoFailed.title"), ex); //$NON-NLS-1$
}
}
}
@Override
public void redo() {
if (isConnected()) {
try {
fDocumentUndoManager.redo();
} catch (ExecutionException ex) {
ex.printStackTrace();
// openErrorDialog(JFaceTextMessages.getString("DefaultUndoManager.error.redoFailed.title"), ex); //$NON-NLS-1$
}
}
}
}
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