X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fundo%2FUndoDeleteOperation.java;fp=src%2Ftim%2Fprune%2Fundo%2FUndoDeleteOperation.java;h=73d9c4f3c50e984662822401b095fcefc94f3438;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/undo/UndoDeleteOperation.java b/src/tim/prune/undo/UndoDeleteOperation.java
new file mode 100644
index 0000000..73d9c4f
--- /dev/null
+++ b/src/tim/prune/undo/UndoDeleteOperation.java
@@ -0,0 +1,56 @@
+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
+{
+	/** Flag to remember whether the deleted point was at the beginning or end of the selected range */
+	private boolean _isAtBoundaryOfSelectedRange = false;
+
+	/**
+	 * @param inAtBoundary true if deleted point was at the beginning or end of the selected range
+	 */
+	public void setAtBoundaryOfSelectedRange(boolean inAtBoundary)
+	{
+		_isAtBoundaryOfSelectedRange = inAtBoundary;
+	}
+
+	/**
+	 * 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 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();
+		// Was the deleted point at the start or end of the selected range?
+		final boolean wasAtStart = numPointsInserted == 1 && inStartIndex == rangeStart && _isAtBoundaryOfSelectedRange;
+		final boolean wasAtEnd   = numPointsInserted == 1 && inStartIndex == (rangeEnd+1) && _isAtBoundaryOfSelectedRange;
+		if (rangeEnd >= inStartIndex && rangeEnd > rangeStart || wasAtStart || wasAtEnd)
+		{
+			rangeEnd += numPointsInserted;
+			if (rangeStart >= inStartIndex) {
+				rangeStart += numPointsInserted;
+			}
+			// Extend selection if the deleted point was at the start or end
+			if (wasAtStart) {
+				rangeStart--;
+			}
+			inTrackInfo.getSelection().selectRange(rangeStart, rangeEnd);
+		}
+	}
+}