X-Git-Url: http://gitweb.fperrin.net/?a=blobdiff_plain;f=tim%2Fprune%2Fundo%2FUndoDeleteOperation.java;fp=tim%2Fprune%2Fundo%2FUndoDeleteOperation.java;h=d99a9f68056637ae838788c709d40e9d061c68cc;hb=326f489e36aa7f235bc19409a57bf4955cd50f24;hp=0000000000000000000000000000000000000000;hpb=8c8868ae29b3252f02e094c02307384cf61ba667;p=GpsPrune.git

diff --git a/tim/prune/undo/UndoDeleteOperation.java b/tim/prune/undo/UndoDeleteOperation.java
new file mode 100644
index 0000000..d99a9f6
--- /dev/null
+++ b/tim/prune/undo/UndoDeleteOperation.java
@@ -0,0 +1,38 @@
+package tim.prune.undo;
+
+import tim.prune.data.TrackInfo;
+
+/**
+ * Abstract class to hold the selection handling required by all
+ * Undo operations which have undeleted something
+ */
+public abstract class UndoDeleteOperation implements UndoOperation
+{
+	/**
+	 * Modify the current point/range selection after the delete operation is undone
+	 * @param inTrackInfo track info object
+	 * @param inStartIndex start index of reinserted range
+	 * @param inEndIndex end index of reinserted range
+	 */
+	protected static void modifySelection(TrackInfo inTrackInfo, int inStartIndex, int inEndIndex)
+	{
+		final int numPointsInserted = inEndIndex - inStartIndex + 1;
+		// See if there is a currently selected point, if so does it need to be modified
+		final int currentPoint = inTrackInfo.getSelection().getCurrentPointIndex();
+		if (currentPoint >= inStartIndex)
+		{
+			inTrackInfo.selectPoint(currentPoint + numPointsInserted);
+		}
+		// Same for currently selected range
+		int rangeStart = inTrackInfo.getSelection().getStart();
+		int rangeEnd   = inTrackInfo.getSelection().getEnd();
+		if (rangeEnd >= inStartIndex && rangeEnd > rangeStart)
+		{
+			rangeEnd += numPointsInserted;
+			if (rangeStart >= inStartIndex) {
+				rangeStart += numPointsInserted;
+			}
+			inTrackInfo.getSelection().selectRange(rangeStart, rangeEnd);
+		}
+	}
+}