Skip to main content
aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat (limited to 'org.eclipse.text/src/org/eclipse/text/undo/UndoableCompoundTextChange.java')
-rw-r--r--org.eclipse.text/src/org/eclipse/text/undo/UndoableCompoundTextChange.java181
1 files changed, 181 insertions, 0 deletions
diff --git a/org.eclipse.text/src/org/eclipse/text/undo/UndoableCompoundTextChange.java b/org.eclipse.text/src/org/eclipse/text/undo/UndoableCompoundTextChange.java
new file mode 100644
index 00000000000..65449e0f138
--- /dev/null
+++ b/org.eclipse.text/src/org/eclipse/text/undo/UndoableCompoundTextChange.java
@@ -0,0 +1,181 @@
+/*******************************************************************************
+ * Copyright (c) 2006 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
+ *******************************************************************************/
+package org.eclipse.text.undo;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.eclipse.core.runtime.IAdaptable;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+
+/**
+ * Represents an undo-able text change consisting of several individual
+ * changes.
+ *
+ * @see org.eclipse.text.undo.UndoableTextChange
+ * @see org.eclipse.text.undo.DocumentUndoManager
+ * @since 3.2
+ */
+class UndoableCompoundTextChange extends UndoableTextChange {
+
+ /** The list of individual changes */
+ private List fChanges= new ArrayList();
+
+ /**
+ * Creates a new compound text change.
+ *
+ * @param manager
+ * the undo manager for this change
+ */
+ UndoableCompoundTextChange(DocumentUndoManager manager) {
+ super(manager);
+ }
+
+ /**
+ * Adds a new individual change to this compound change.
+ *
+ * @param change the change to be added
+ */
+ protected void add(UndoableTextChange change) {
+ fChanges.add(change);
+ }
+
+ /*
+ * @see org.eclipse.jface.text.UndoableTextChange#undo()
+ */
+ public IStatus undo(IProgressMonitor monitor, IAdaptable uiInfo) {
+
+ int size= fChanges.size();
+ if (size > 0) {
+ UndoableTextChange c;
+
+ c= (UndoableTextChange) fChanges.get(0);
+ manager.fireDocumentUndo(c.fStart, c.fPreservedText, c.fText, uiInfo,
+ DocumentUndoEvent.ABOUT_TO_UNDO, true);
+
+ for (int i= size - 1; i >= 0; --i) {
+ c= (UndoableTextChange) fChanges.get(i);
+ c.undoTextChange();
+ }
+ manager.fireDocumentUndo(c.fStart, c.fPreservedText, c.fText, uiInfo,
+ DocumentUndoEvent.UNDONE, true);
+ }
+ return Status.OK_STATUS;
+ }
+
+ /*
+ * @see org.eclipse.jface.text.UndoableTextChange#redo()
+ */
+ public IStatus redo(IProgressMonitor monitor, IAdaptable uiInfo) {
+
+ int size= fChanges.size();
+ if (size > 0) {
+
+ UndoableTextChange c;
+ c= (UndoableTextChange) fChanges.get(size - 1);
+ manager.fireDocumentUndo(c.fStart, c.fText, c.fPreservedText, uiInfo,
+ DocumentUndoEvent.ABOUT_TO_REDO, true);
+
+ for (int i= 0; i <= size - 1; ++i) {
+ c= (UndoableTextChange) fChanges.get(i);
+ c.redoTextChange();
+ }
+ manager.fireDocumentUndo(c.fStart, c.fText, c.fPreservedText, uiInfo,
+ DocumentUndoEvent.REDONE, true);
+ }
+
+ return Status.OK_STATUS;
+ }
+
+ /*
+ * @see UndoableTextChange#updateUndoableTextChange
+ */
+ protected void updateTextChange() {
+ // first gather the data from the buffers
+ super.updateTextChange();
+
+ // the result of the update is stored as a child change
+ UndoableTextChange c= new UndoableTextChange(manager);
+ c.fStart= fStart;
+ c.fEnd= fEnd;
+ c.fText= fText;
+ c.fPreservedText= fPreservedText;
+ c.fUndoModificationStamp= fUndoModificationStamp;
+ c.fRedoModificationStamp= fRedoModificationStamp;
+ add(c);
+
+ // clear out all indexes now that the child is added
+ reinitialize();
+ }
+
+ /*
+ * @see UndoableTextChange#createCurrent
+ */
+ protected UndoableTextChange createCurrent() {
+
+ if (!manager.fFoldingIntoCompoundChange)
+ return new UndoableTextChange(manager);
+
+ reinitialize();
+ return this;
+ }
+
+ /*
+ * @see org.eclipse.jface.text.UndoableTextChange#commit()
+ */
+ protected void commit() {
+ // if there is pending data, update the text change
+ if (fStart > -1)
+ updateTextChange();
+ manager.fCurrent= createCurrent();
+ }
+
+ /**
+ * Checks whether the text change is valid for undo or redo.
+ *
+ * @return true if the text change is valid
+ */
+ protected boolean isValid() {
+ return fStart > -1 || fChanges.size() > 0;
+ }
+
+ /**
+ * Returns the undo modification stamp.
+ *
+ * @return the undo modification stamp
+ */
+ protected long getUndoModificationStamp() {
+ if (fStart > -1)
+ return super.getUndoModificationStamp();
+ else if (fChanges.size() > 0)
+ return ((UndoableTextChange) fChanges.get(0))
+ .getUndoModificationStamp();
+
+ return fUndoModificationStamp;
+ }
+
+ /**
+ * Returns the redo modification stamp.
+ *
+ * @return the redo modification stamp
+ */
+ protected long getRedoModificationStamp() {
+ if (fStart > -1)
+ return super.getRedoModificationStamp();
+ else if (fChanges.size() > 0)
+ return ((UndoableTextChange) fChanges.get(fChanges.size() - 1))
+ .getRedoModificationStamp();
+
+ return fRedoModificationStamp;
+ }
+}

Back to the top