analysis/org.eclipse.tracecompass.analysis.timing.ui/src/org/eclipse/tracecompass/internal/analysis/timing/ui/views/segmentstore/density/MouseDragZoomProvider.java

   1 /**********************************************************************
   2  * Copyright (c) 2015 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
  10 package org.eclipse.tracecompass.internal.analysis.timing.ui.views.segmentstore.density;
  11
  12 import org.eclipse.jdt.annotation.Nullable;
  13 import org.eclipse.swt.SWT;
  14 import org.eclipse.swt.events.MouseEvent;
  15 import org.eclipse.swt.events.MouseListener;
  16 import org.eclipse.swt.events.MouseMoveListener;
  17 import org.eclipse.swt.events.PaintEvent;
  18 import org.eclipse.tracecompass.analysis.timing.ui.views.segmentstore.density.AbstractSegmentStoreDensityViewer;
  19 import org.swtchart.IAxis;
  20 import org.swtchart.ICustomPaintListener;
  21 import org.swtchart.IPlotArea;
  22 import org.swtchart.Range;
  23
  24 /**
  25  * Class for providing zooming based on mouse drag with right mouse button.
  26  * It also notifies the viewer about a change of range.
  27  *
  28  * @author Bernd Hufmann
  29  * @author Marc-Andre Laperle
  30  */
  31 public class MouseDragZoomProvider extends BaseMouseProvider implements MouseListener, MouseMoveListener, ICustomPaintListener {
  32
  33     /** Cached start coordinate */
  34     private double fStartCoordinate;
  35     /** Cached end coordinate */
  36     private double fEndCoordinate;
  37     /** Flag indicating that an update is ongoing */
  38     private boolean fIsUpdate;
  39
  40     /**
  41      * Default constructor
  42      *
  43      * @param densityViewer
  44      *            the density viewer reference.
  45      */
  46     public MouseDragZoomProvider(AbstractSegmentStoreDensityViewer densityViewer) {
  47         super(densityViewer);
  48         register();
  49     }
  50
  51     @Override
  52     public final void register() {
  53         getChart().getPlotArea().addMouseListener(this);
  54         getChart().getPlotArea().addMouseMoveListener(this);
  55         ((IPlotArea) getChart().getPlotArea()).addCustomPaintListener(this);
  56     }
  57
  58     @Override
  59     public final void deregister() {
  60         if (!getChart().isDisposed()) {
  61             getChart().getPlotArea().removeMouseListener(this);
  62             getChart().getPlotArea().removeMouseMoveListener(this);
  63             ((IPlotArea) getChart().getPlotArea()).removeCustomPaintListener(this);
  64         }
  65     }
  66
  67     @Override
  68     public void mouseDoubleClick(@Nullable MouseEvent e) {
  69     }
  70
  71     @Override
  72     public void mouseDown(@Nullable MouseEvent e) {
  73         if (e != null && e.button == 3) {
  74             IAxis xAxis = getChart().getAxisSet().getXAxis(0);
  75             fStartCoordinate = xAxis.getDataCoordinate(e.x);
  76             fEndCoordinate = fStartCoordinate;
  77             fIsUpdate = true;
  78         }
  79     }
  80
  81     @Override
  82     public void mouseUp(@Nullable MouseEvent e) {
  83         if ((fIsUpdate) && (fStartCoordinate != fEndCoordinate)) {
  84             if (fStartCoordinate > fEndCoordinate) {
  85                 double tmp = fStartCoordinate;
  86                 fStartCoordinate = fEndCoordinate;
  87                 fEndCoordinate = tmp;
  88             }
  89             getDensityViewer().zoom(new Range(fStartCoordinate, fEndCoordinate));
  90         }
  91
  92         if (fIsUpdate) {
  93             getChart().redraw();
  94         }
  95         fIsUpdate = false;
  96     }
  97
  98     @Override
  99     public void mouseMove(@Nullable MouseEvent e) {
 100         if (e != null && fIsUpdate) {
 101             IAxis xAxis = getChart().getAxisSet().getXAxis(0);
 102             fEndCoordinate = xAxis.getDataCoordinate(e.x);
 103             getChart().redraw();
 104         }
 105     }
 106
 107     @Override
 108     public void paintControl(@Nullable PaintEvent e) {
 109         if (e != null && fIsUpdate && (fStartCoordinate != fEndCoordinate)) {
 110             IAxis xAxis = getChart().getAxisSet().getXAxis(0);
 111             int startX = xAxis.getPixelCoordinate(fStartCoordinate);
 112             int endX = xAxis.getPixelCoordinate(fEndCoordinate);
 113
 114             e.gc.setBackground(getChart().getDisplay().getSystemColor(SWT.COLOR_TITLE_INACTIVE_BACKGROUND));
 115             if (fStartCoordinate < fEndCoordinate) {
 116                 e.gc.fillRectangle(startX, 0, endX - startX, e.height);
 117             } else {
 118                 e.gc.fillRectangle(endX, 0, startX - endX, e.height);
 119             }
 120             e.gc.drawLine(startX, 0, startX, e.height);
 121             e.gc.drawLine(endX, 0, endX, e.height);
 122         }
 123     }
 124
 125     @Override
 126     public boolean drawBehindSeries() {
 127         return true;
 128     }
 129 }