analysis/org.eclipse.tracecompass.analysis.timing.ui/src/org/eclipse/tracecompass/internal/analysis/timing/ui/views/segmentstore/density/MouseSelectionProvider.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.swt.widgets.Display;
  19 import org.eclipse.tracecompass.analysis.timing.ui.views.segmentstore.density.AbstractSegmentStoreDensityViewer;
  20 import org.swtchart.IAxis;
  21 import org.swtchart.ICustomPaintListener;
  22 import org.swtchart.IPlotArea;
  23 import org.swtchart.Range;
  24
  25 /**
  26  * Class for providing selection with the left mouse button. It also notifies
  27  * the viewer about a change of selection.
  28  *
  29  * @author Bernd Hufmann
  30  * @author Marc-Andre Laperle
  31  */
  32 public class MouseSelectionProvider extends BaseMouseProvider implements MouseListener, MouseMoveListener, ICustomPaintListener {
  33
  34     /** Cached start coordinate */
  35     private double fStartCoordinate;
  36     /** Cached end coordinate */
  37     private double fEndCoordinate;
  38     /** Flag indicating that an update is ongoing */
  39     private boolean fIsUpdate;
  40     /** Flag indicating that the begin marker is dragged */
  41     private boolean fDragBeginMarker;
  42
  43     /**
  44      * Constructor for a mouse selection provider.
  45      *
  46      * @param densityViewer
  47      *            The parent density viewer
  48      */
  49     public MouseSelectionProvider(AbstractSegmentStoreDensityViewer densityViewer) {
  50         super(densityViewer);
  51         register();
  52     }
  53
  54     @Override
  55     public void register() {
  56         getChart().getPlotArea().addMouseListener(this);
  57         getChart().getPlotArea().addMouseMoveListener(this);
  58         ((IPlotArea) getChart().getPlotArea()).addCustomPaintListener(this);
  59     }
  60
  61     @Override
  62     public void deregister() {
  63         if (!getChart().isDisposed()) {
  64             getChart().getPlotArea().removeMouseListener(this);
  65             getChart().getPlotArea().removeMouseMoveListener(this);
  66             ((IPlotArea) getChart().getPlotArea()).removeCustomPaintListener(this);
  67         }
  68     }
  69
  70     @Override
  71     public void mouseDoubleClick(@Nullable MouseEvent e) {
  72     }
  73
  74     @Override
  75     public void mouseDown(@Nullable MouseEvent e) {
  76         if (e != null && (e.button == 1)) {
  77             fDragBeginMarker = false;
  78             if (((e.stateMask & SWT.SHIFT) != SWT.SHIFT) || (fEndCoordinate == fStartCoordinate)) {
  79                 IAxis xAxis = getChart().getAxisSet().getXAxis(0);
  80                 fStartCoordinate = xAxis.getDataCoordinate(e.x);
  81                 fEndCoordinate = fStartCoordinate;
  82             } else {
  83                 double selectionBegin = fStartCoordinate;
  84                 double selectionEnd = fEndCoordinate;
  85                 IAxis xAxis = getChart().getAxisSet().getXAxis(0);
  86                 double time = xAxis.getDataCoordinate(e.x);
  87                 if (Math.abs(time - selectionBegin) < Math.abs(time - selectionEnd)) {
  88                     fDragBeginMarker = true;
  89                     fStartCoordinate = time;
  90                     fEndCoordinate = selectionEnd;
  91                 } else {
  92                     fStartCoordinate = selectionBegin;
  93                     fEndCoordinate = time;
  94                 }
  95             }
  96             fIsUpdate = true;
  97         }
  98     }
  99
 100     @Override
 101     public void mouseUp(@Nullable MouseEvent e) {
 102         if ((fIsUpdate)) {
 103             if (fStartCoordinate > fEndCoordinate) {
 104                 double tmp = fStartCoordinate;
 105                 fStartCoordinate = fEndCoordinate;
 106                 fEndCoordinate = tmp;
 107             }
 108             if (!isEmptySelection()) {
 109                 getDensityViewer().select(new Range(Double.MIN_VALUE, Double.MAX_VALUE));
 110             } else {
 111                 getDensityViewer().select(new Range(fStartCoordinate, fEndCoordinate));
 112             }
 113             fIsUpdate = false;
 114             getChart().redraw();
 115         }
 116     }
 117
 118     @Override
 119     public void mouseMove(@Nullable MouseEvent e) {
 120         if (e != null && fIsUpdate) {
 121             IAxis xAxis = getChart().getAxisSet().getXAxis(0);
 122             if (fDragBeginMarker) {
 123                 fStartCoordinate = xAxis.getDataCoordinate(e.x);
 124             } else {
 125                 fEndCoordinate = xAxis.getDataCoordinate(e.x);
 126             }
 127             getChart().redraw();
 128         }
 129     }
 130
 131     private boolean isEmptySelection() {
 132         IAxis xAxis = getChart().getAxisSet().getXAxis(0);
 133         int begin = xAxis.getPixelCoordinate(fStartCoordinate);
 134         int end = xAxis.getPixelCoordinate(fEndCoordinate);
 135
 136         return Math.abs(end - begin) > 2;
 137     }
 138
 139     @Override
 140     public void paintControl(@Nullable PaintEvent e) {
 141         if (e == null || !isEmptySelection()) {
 142             return;
 143         }
 144
 145         Display display = getChart().getDisplay();
 146
 147         IAxis xAxis = getChart().getAxisSet().getXAxis(0);
 148         e.gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
 149         e.gc.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
 150         e.gc.setLineStyle(SWT.LINE_SOLID);
 151         int begin = xAxis.getPixelCoordinate(fStartCoordinate);
 152         e.gc.drawLine(begin, 0, begin, e.height);
 153
 154         int end = xAxis.getPixelCoordinate(fEndCoordinate);
 155         e.gc.drawLine(end, 0, end, e.height);
 156
 157         e.gc.setAlpha(150);
 158         if (Math.abs(fEndCoordinate - fStartCoordinate) > 1) {
 159             e.gc.setBackground(display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
 160             int beginX = xAxis.getPixelCoordinate(fStartCoordinate);
 161             int endX = xAxis.getPixelCoordinate(fEndCoordinate);
 162             if (fEndCoordinate > fStartCoordinate) {
 163                 e.gc.fillRectangle(beginX + 1, 0, endX - beginX - 1, e.height);
 164             } else {
 165                 e.gc.fillRectangle(endX + 1, 0, beginX - endX - 1, e.height);
 166             }
 167         }
 168     }
 169
 170     @Override
 171     public boolean drawBehindSeries() {
 172         return false;
 173     }
 174 }