tmf/org.eclipse.tracecompass.tmf.ui/src/org/eclipse/tracecompass/tmf/ui/viewers/xycharts/TmfMouseDragProvider.java

   1 /**********************************************************************
   2  * Copyright (c) 2014 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Bernd Hufmann - Initial API and implementation
  11  **********************************************************************/
  12 package org.eclipse.tracecompass.tmf.ui.viewers.xycharts;
  13
  14 import org.eclipse.swt.events.MouseEvent;
  15 import org.eclipse.swt.events.MouseListener;
  16 import org.eclipse.swt.events.MouseMoveListener;
  17 import org.swtchart.IAxis;
  18 import org.swtchart.Range;
  19
  20 /**
  21  * Class for updating time ranges based on middle mouse button drag.
  22  * It also notifies the viewer about a change of range.
  23  *
  24  * @author Bernd Hufmann
  25  */
  26 public class TmfMouseDragProvider extends TmfBaseProvider implements MouseListener, MouseMoveListener {
  27
  28     // ------------------------------------------------------------------------
  29     // Attributes
  30     // ------------------------------------------------------------------------
  31     /** Cached start time */
  32     private long fStartTime;
  33     /** Cached end time */
  34     private long fEndTime;
  35     /** Flag indicating that an update is ongoing */
  36     private boolean fIsUpdate;
  37     /** Cached position when mouse button was pressed */
  38     private int fStartPosition;
  39
  40     // ------------------------------------------------------------------------
  41     // Constructors
  42     // ------------------------------------------------------------------------
  43     /**
  44      * Default constructor
  45      *
  46      * @param tmfChartViewer
  47      *          the chart viewer reference.
  48      */
  49     public TmfMouseDragProvider(ITmfChartTimeProvider tmfChartViewer) {
  50         super(tmfChartViewer);
  51         register();
  52     }
  53
  54     // ------------------------------------------------------------------------
  55     // TmfBaseProvider
  56     // ------------------------------------------------------------------------
  57     @Override
  58     public void register() {
  59         getChart().getPlotArea().addMouseListener(this);
  60         getChart().getPlotArea().addMouseMoveListener(this);
  61     }
  62
  63     @Override
  64     public void deregister() {
  65         if ((getChartViewer().getControl() != null) && !getChartViewer().getControl().isDisposed()) {
  66             getChart().getPlotArea().removeMouseListener(this);
  67             getChart().getPlotArea().removeMouseMoveListener(this);
  68         }
  69     }
  70
  71     @Override
  72     public void refresh() {
  73         // nothing to do
  74     }
  75
  76     // ------------------------------------------------------------------------
  77     // MouseListener
  78     // ------------------------------------------------------------------------
  79     @Override
  80     public void mouseDoubleClick(MouseEvent e) {
  81     }
  82
  83     @Override
  84     public void mouseDown(MouseEvent e) {
  85         if ((getChartViewer().getWindowDuration() != 0) && (e.button == 2)) {
  86             fStartPosition = e.x;
  87             fIsUpdate = true;
  88         }
  89     }
  90
  91     @Override
  92     public void mouseUp(MouseEvent e) {
  93         if ((fIsUpdate) && (fStartTime != fEndTime)) {
  94             ITmfChartTimeProvider viewer = getChartViewer();
  95             viewer.updateWindow(fStartTime, fEndTime);
  96         }
  97         fIsUpdate = false;
  98     }
  99
 100     // ------------------------------------------------------------------------
 101     // MouseMoveListener
 102     // ------------------------------------------------------------------------
 103     @Override
 104     public void mouseMove(MouseEvent e) {
 105         if (fIsUpdate) {
 106             IAxis xAxis = getChart().getAxisSet().getXAxis(0);
 107
 108             ITmfChartTimeProvider viewer = getChartViewer();
 109
 110             fStartTime = viewer.getWindowStartTime();
 111             fEndTime = viewer.getWindowEndTime();
 112
 113             long startTime = viewer.getStartTime();
 114             long endTime = viewer.getEndTime();
 115
 116             long delta = 0;
 117             if (fStartPosition > e.x) {
 118                 delta = (long) (xAxis.getDataCoordinate(fStartPosition) - xAxis.getDataCoordinate(e.x));
 119                 long max = endTime - fEndTime;
 120                 delta = Math.max(0, Math.min(delta, max));
 121                 fStartTime = fStartTime + delta;
 122                 fEndTime = fEndTime + delta;
 123             } else if (fStartPosition < e.x) {
 124                 delta = (long) (xAxis.getDataCoordinate(e.x) - xAxis.getDataCoordinate(fStartPosition));
 125                 long max = fStartTime - startTime;
 126                 delta = Math.max(0, Math.min(delta, max));
 127                 fStartTime = fStartTime - delta;
 128                 fEndTime = fEndTime - delta;
 129             }
 130
 131             xAxis.setRange(new Range(fStartTime - viewer.getTimeOffset(), fEndTime - viewer.getTimeOffset()));
 132             getChart().redraw();
 133         }
 134     }
 135 }