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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);
}
}
}
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