/*
* WordWrapCursorTracker.java
*
* Copyright (C) 2009-12 by RStudio, Inc.
*
* Unless you have received this program directly from RStudio pursuant
* to the terms of a commercial license agreement with RStudio, then
* this program is licensed to you under the terms of version 3 of the
* GNU Affero General Public License. This program is distributed WITHOUT
* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
*
*/
package org.rstudio.studio.client.workbench.views.source.editors.text;
import org.rstudio.core.client.Point;
public class WordWrapCursorTracker
{
public WordWrapCursorTracker(int row, int column)
{
row_ = row;
column_ = column;
}
public Point getResult()
{
return output_;
}
public void onBeginInputRow()
{
currentInputRow_++;
}
public void onChunkWritten(String chunk,
int outputRow,
int outputColumn,
int inputColumn)
{
if (output_ != null)
return; // we already have an answer
// Debug.devlogf("Row: {1}, Chunk: {0}", chunk, row_);
// Compare the current insertion point to the desired cursor position.
int compare = currentInputRow_ - row_;
if (compare == 0)
compare = (inputColumn + chunk.length()) - column_;
if (compare < 0)
{
// Debug.devlog("skip");
// We haven't gotten there yet--do nothing
}
else if (currentInputRow_ == row_ && inputColumn <= column_)
{
// Cursor position is inside the current chunk--nice!
output_ = new Point(outputColumn + (column_ - inputColumn),
outputRow);
// Debug.devlogf("exact: {0}, {1}", output_.getY(), output_.getX());
}
else
{
// Debug.devlog("slop");
// We've gone past the cursor position; use the current insertion
// point before we get any further away
output_ = new Point(outputColumn, outputRow);
}
}
private final int row_;
private final int column_;
private Point output_;
private int currentInputRow_ = -1;
}