org.eclipse.linuxtools.tmf.ui/src/org/eclipse/linuxtools/tmf/ui/viewers/xycharts/TmfMouseDragZoomProvider.java

   1 /**********************************************************************
   2  * Copyright (c) 2013, 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.linuxtools.tmf.ui.viewers.xycharts;
  13
  14 import org.eclipse.swt.SWT;
  15 import org.eclipse.swt.events.MouseEvent;
  16 import org.eclipse.swt.events.MouseListener;
  17 import org.eclipse.swt.events.MouseMoveListener;
  18 import org.eclipse.swt.events.PaintEvent;
  19 import org.swtchart.IAxis;
  20 import org.swtchart.ICustomPaintListener;
  21 import org.swtchart.IPlotArea;
  22
  23 /**
  24  * Class for providing zooming based on mouse drag with right mouse button.
  25  * It also notifies the viewer about a change of range.
  26  *
  27  * @author Bernd Hufmann
  28  * @since 3.0
  29  */
  30 public class TmfMouseDragZoomProvider extends TmfBaseProvider implements MouseListener, MouseMoveListener, ICustomPaintListener {
  31
  32     // ------------------------------------------------------------------------
  33     // Attributes
  34     // ------------------------------------------------------------------------
  35     /** Cached start time */
  36     private long fStartTime;
  37     /** Cached end time */
  38     private long fEndTime;
  39     /** Flag indicating that an update is ongoing */
  40     private boolean fIsUpdate;
  41
  42     // ------------------------------------------------------------------------
  43     // Constructors
  44     // ------------------------------------------------------------------------
  45     /**
  46      * Default constructor
  47      *
  48      * @param tmfChartViewer
  49      *          the chart viewer reference.
  50      */
  51     public TmfMouseDragZoomProvider(ITmfChartTimeProvider tmfChartViewer) {
  52         super(tmfChartViewer);
  53         register();
  54     }
  55
  56     // ------------------------------------------------------------------------
  57     // TmfBaseProvider
  58     // ------------------------------------------------------------------------
  59     @Override
  60     public void register() {
  61         getChart().getPlotArea().addMouseListener(this);
  62         getChart().getPlotArea().addMouseMoveListener(this);
  63         ((IPlotArea) getChart().getPlotArea()).addCustomPaintListener(this);
  64     }
  65
  66     @Override
  67     public void deregister() {
  68         if ((getChartViewer().getControl() != null) && !getChartViewer().getControl().isDisposed()) {
  69             getChart().getPlotArea().removeMouseListener(this);
  70             getChart().getPlotArea().removeMouseMoveListener(this);
  71             ((IPlotArea) getChart().getPlotArea()).removeCustomPaintListener(this);
  72         }
  73     }
  74
  75     @Override
  76     public void refresh() {
  77         // nothing to do
  78     }
  79
  80     // ------------------------------------------------------------------------
  81     // MouseListener
  82     // ------------------------------------------------------------------------
  83     @Override
  84     public void mouseDoubleClick(MouseEvent e) {
  85     }
  86
  87     @Override
  88     public void mouseDown(MouseEvent e) {
  89         if ((getChartViewer().getWindowDuration() != 0) && (e.button == 3)) {
  90             IAxis xAxis = getChart().getAxisSet().getXAxis(0);
  91             fStartTime = limitXDataCoordinate(xAxis.getDataCoordinate(e.x));
  92             fEndTime = fStartTime;
  93             fIsUpdate = true;
  94         }
  95     }
  96
  97     @Override
  98     public void mouseUp(MouseEvent e) {
  99         if ((fIsUpdate) && (fStartTime != fEndTime)) {
 100             if (fStartTime > fEndTime) {
 101                 long tmp = fStartTime;
 102                 fStartTime = fEndTime;
 103                 fEndTime = tmp;
 104             }
 105             ITmfChartTimeProvider viewer = getChartViewer();
 106             viewer.updateWindow(fStartTime + viewer.getTimeOffset(), fEndTime + viewer.getTimeOffset());
 107         }
 108
 109         if (fIsUpdate) {
 110             getChart().redraw();
 111         }
 112         fIsUpdate = false;
 113     }
 114
 115     // ------------------------------------------------------------------------
 116     // MouseMoveListener
 117     // ------------------------------------------------------------------------
 118     @Override
 119     public void mouseMove(MouseEvent e) {
 120         if (fIsUpdate) {
 121             IAxis xAxis = getChart().getAxisSet().getXAxis(0);
 122             fEndTime = limitXDataCoordinate(xAxis.getDataCoordinate(e.x));
 123             getChart().redraw();
 124         }
 125     }
 126
 127     // ------------------------------------------------------------------------
 128     // ICustomPaintListener
 129     // ------------------------------------------------------------------------
 130     @Override
 131     public void paintControl(PaintEvent e) {
 132         if (fIsUpdate && (fStartTime != fEndTime)) {
 133             IAxis xAxis = getChart().getAxisSet().getXAxis(0);
 134             int startX = xAxis.getPixelCoordinate(fStartTime);
 135             int endX = xAxis.getPixelCoordinate(fEndTime);
 136
 137             e.gc.setBackground(TmfXYChartViewer.getDisplay().getSystemColor(SWT.COLOR_TITLE_INACTIVE_BACKGROUND));
 138             if (fStartTime < fEndTime) {
 139                 e.gc.fillRectangle(startX, 0, endX - startX, e.height);
 140             } else {
 141                 e.gc.fillRectangle(endX, 0, startX - endX, e.height);
 142             }
 143             e.gc.drawLine(startX, 0, startX, e.height);
 144             e.gc.drawLine(endX, 0, endX, e.height);
 145         }
 146     }
 147
 148     @Override
 149     public boolean drawBehindSeries() {
 150         return true;
 151     }
 152 }