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/**********************************************************************
* Copyright (c) 2014 Ericsson
*
* 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:
* Bernd Hufmann - Initial API and implementation
**********************************************************************/
package org.eclipse.tracecompass.tmf.ui.viewers.xycharts;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.events.MouseMoveListener;
import org.swtchart.IAxis;
import org.swtchart.Range;
/**
* Class for updating time ranges based on middle mouse button drag.
* It also notifies the viewer about a change of range.
*
* @author Bernd Hufmann
*/
public class TmfMouseDragProvider extends TmfBaseProvider implements MouseListener, MouseMoveListener {
// ------------------------------------------------------------------------
// Attributes
// ------------------------------------------------------------------------
/** Cached start time */
private long fStartTime;
/** Cached end time */
private long fEndTime;
/** Flag indicating that an update is ongoing */
private boolean fIsUpdate;
/** Cached position when mouse button was pressed */
private int fStartPosition;
// ------------------------------------------------------------------------
// Constructors
// ------------------------------------------------------------------------
/**
* Default constructor
*
* @param tmfChartViewer
* the chart viewer reference.
*/
public TmfMouseDragProvider(ITmfChartTimeProvider tmfChartViewer) {
super(tmfChartViewer);
register();
}
// ------------------------------------------------------------------------
// TmfBaseProvider
// ------------------------------------------------------------------------
@Override
public void register() {
getChart().getPlotArea().addMouseListener(this);
getChart().getPlotArea().addMouseMoveListener(this);
}
@Override
public void deregister() {
if ((getChartViewer().getControl() != null) && !getChartViewer().getControl().isDisposed()) {
getChart().getPlotArea().removeMouseListener(this);
getChart().getPlotArea().removeMouseMoveListener(this);
}
}
@Override
public void refresh() {
// nothing to do
}
// ------------------------------------------------------------------------
// MouseListener
// ------------------------------------------------------------------------
@Override
public void mouseDoubleClick(MouseEvent e) {
// Do nothing
}
@Override
public void mouseDown(MouseEvent e) {
if ((getChartViewer().getWindowDuration() != 0) && ((e.button == 2) || (e.button == 1 && (e.stateMask & SWT.CTRL) != 0))) {
fStartPosition = e.x;
fIsUpdate = true;
}
}
@Override
public void mouseUp(MouseEvent e) {
if ((fIsUpdate) && (fStartTime != fEndTime)) {
ITmfChartTimeProvider viewer = getChartViewer();
viewer.updateWindow(fStartTime, fEndTime);
}
fIsUpdate = false;
}
// ------------------------------------------------------------------------
// MouseMoveListener
// ------------------------------------------------------------------------
@Override
public void mouseMove(MouseEvent e) {
if (fIsUpdate) {
IAxis xAxis = getChart().getAxisSet().getXAxis(0);
ITmfChartTimeProvider viewer = getChartViewer();
fStartTime = viewer.getWindowStartTime();
fEndTime = viewer.getWindowEndTime();
long startTime = viewer.getStartTime();
long endTime = viewer.getEndTime();
long delta = 0;
if (fStartPosition > e.x) {
delta = (long) (xAxis.getDataCoordinate(fStartPosition) - xAxis.getDataCoordinate(e.x));
long max = endTime - fEndTime;
delta = Math.max(0, Math.min(delta, max));
fStartTime = fStartTime + delta;
fEndTime = fEndTime + delta;
} else if (fStartPosition < e.x) {
delta = (long) (xAxis.getDataCoordinate(e.x) - xAxis.getDataCoordinate(fStartPosition));
long max = fStartTime - startTime;
delta = Math.max(0, Math.min(delta, max));
fStartTime = fStartTime - delta;
fEndTime = fEndTime - delta;
}
xAxis.setRange(new Range(fStartTime - viewer.getTimeOffset(), fEndTime - viewer.getTimeOffset()));
getChart().redraw();
}
}
}
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