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c392540b | 1 | /******************************************************************************* |
c8422608 | 2 | * Copyright (c) 2011, 2013 Ericsson |
20ff3b75 | 3 | * |
c392540b FC |
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 | |
20ff3b75 | 8 | * |
c392540b FC |
9 | * Contributors: |
10 | * Francois Chouinard - Initial API and implementation | |
e0752744 | 11 | * Francois Chouinard - Moved from LTTng to TMF |
65cdf787 | 12 | * Patrick Tasse - Update for mouse wheel zoom |
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13 | *******************************************************************************/ |
14 | ||
e0752744 | 15 | package org.eclipse.linuxtools.tmf.ui.views.histogram; |
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16 | |
17 | import org.eclipse.swt.events.MouseEvent; | |
18 | import org.eclipse.swt.events.MouseWheelListener; | |
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19 | |
20 | /** | |
b544077e | 21 | * Class to handle zooming within histogram windows.. |
20ff3b75 | 22 | * |
b544077e BH |
23 | * @version 1.0 |
24 | * @author Francois Chouinard | |
c392540b | 25 | * <p> |
c392540b FC |
26 | */ |
27 | public class HistogramZoom implements MouseWheelListener { | |
28 | ||
29 | // ------------------------------------------------------------------------ | |
30 | // Constants | |
31 | // ------------------------------------------------------------------------ | |
32 | ||
33 | private final static double ZOOM_FACTOR = 0.8; | |
34 | ||
35 | // ------------------------------------------------------------------------ | |
36 | // Attributes | |
37 | // ------------------------------------------------------------------------ | |
38 | ||
39 | private final Histogram fHistogram; | |
c392540b FC |
40 | |
41 | private long fAbsoluteStartTime; | |
42 | private long fAbsoluteEndTime; | |
43 | private final long fMinWindowSize; | |
44 | ||
45 | private long fRangeStartTime; | |
46 | private long fRangeDuration; | |
47 | ||
c392540b | 48 | // ------------------------------------------------------------------------ |
e0752744 | 49 | // Constructors |
c392540b FC |
50 | // ------------------------------------------------------------------------ |
51 | ||
20ff3b75 AM |
52 | /** |
53 | * Standard constructor. | |
54 | * | |
55 | * @param histogram | |
56 | * The parent histogram object | |
20ff3b75 AM |
57 | * @param start |
58 | * The start time of the zoom area | |
59 | * @param end | |
60 | * The end time of the zoom area | |
65cdf787 | 61 | * @since 2.0 |
20ff3b75 | 62 | */ |
65cdf787 | 63 | public HistogramZoom(Histogram histogram, long start, long end) { |
c392540b | 64 | fHistogram = histogram; |
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65 | fAbsoluteStartTime = start; |
66 | fAbsoluteEndTime = end; | |
65cdf787 | 67 | fMinWindowSize = 0; |
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68 | |
69 | fRangeStartTime = fAbsoluteStartTime; | |
70 | fRangeDuration = fAbsoluteStartTime + fMinWindowSize; | |
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71 | } |
72 | ||
73 | // ------------------------------------------------------------------------ | |
74 | // Accessors | |
75 | // ------------------------------------------------------------------------ | |
76 | ||
b544077e BH |
77 | /** |
78 | * Get start time of the zoom window. | |
79 | * @return the start time. | |
80 | */ | |
5a5c2fc7 | 81 | public synchronized long getStartTime() { |
c392540b FC |
82 | return fRangeStartTime; |
83 | } | |
84 | ||
b544077e BH |
85 | /** |
86 | * Get the end time of the zoom window. | |
87 | * @return the end time | |
88 | */ | |
5a5c2fc7 | 89 | public synchronized long getEndTime() { |
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90 | return fRangeStartTime + fRangeDuration; |
91 | } | |
92 | ||
b544077e BH |
93 | /** |
94 | * Get the duration of the zoom window. | |
95 | * @return the duration of the zoom window. | |
96 | */ | |
5a5c2fc7 | 97 | public synchronized long getDuration() { |
c392540b FC |
98 | return fRangeDuration; |
99 | } | |
100 | ||
101 | // ------------------------------------------------------------------------ | |
102 | // Operations | |
103 | // ------------------------------------------------------------------------ | |
104 | ||
b544077e BH |
105 | /** |
106 | * The the full time range of the histogram | |
20ff3b75 | 107 | * |
b544077e BH |
108 | * @param startTime the start time the histogram |
109 | * @param endTime the end time of the histogram | |
110 | */ | |
8edafa7f | 111 | public synchronized void setFullRange(long startTime, long endTime) { |
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112 | fAbsoluteStartTime = startTime; |
113 | fAbsoluteEndTime = endTime; | |
114 | } | |
115 | ||
b544077e BH |
116 | /** |
117 | * Sets the new zoom window | |
118 | * @param startTime the start time | |
119 | * @param duration the duration | |
120 | */ | |
8edafa7f | 121 | public synchronized void setNewRange(long startTime, long duration) { |
41b5c37f AM |
122 | long realStart = startTime; |
123 | ||
124 | if (realStart < fAbsoluteStartTime) { | |
125 | realStart = fAbsoluteStartTime; | |
20ff3b75 | 126 | } |
c392540b | 127 | |
41b5c37f | 128 | long endTime = realStart + duration; |
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129 | if (endTime > fAbsoluteEndTime) { |
130 | endTime = fAbsoluteEndTime; | |
20ff3b75 | 131 | if (endTime - duration > fAbsoluteStartTime) { |
41b5c37f | 132 | realStart = endTime - duration; |
20ff3b75 | 133 | } else { |
41b5c37f | 134 | realStart = fAbsoluteStartTime; |
c392540b FC |
135 | } |
136 | } | |
137 | ||
41b5c37f AM |
138 | fRangeStartTime = realStart; |
139 | fRangeDuration = endTime - realStart; | |
c392540b FC |
140 | } |
141 | ||
142 | // ------------------------------------------------------------------------ | |
143 | // MouseWheelListener | |
144 | // ------------------------------------------------------------------------ | |
145 | ||
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146 | @Override |
147 | public synchronized void mouseScrolled(MouseEvent event) { | |
38df2c82 | 148 | zoom(event.count); |
c392540b FC |
149 | } |
150 | ||
151 | private synchronized void zoom(int nbClicks) { | |
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152 | // Compute the new time range |
153 | long requestedRange = (nbClicks > 0) ? Math.round(ZOOM_FACTOR * fRangeDuration) : (long) Math.ceil(fRangeDuration * (1.0 / ZOOM_FACTOR)); | |
154 | ||
bd6307ff | 155 | // Distribute delta and adjust for boundaries |
83f4e378 | 156 | long requestedStart = validateStart(fRangeStartTime + (fRangeDuration - requestedRange) / 2); |
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157 | long requestedEnd = validateEnd(requestedStart, requestedStart + requestedRange); |
158 | requestedStart = validateStart(requestedEnd - requestedRange); | |
159 | ||
160 | fHistogram.updateTimeRange(requestedStart, requestedEnd); | |
161 | } | |
162 | ||
163 | private long validateStart(long start) { | |
41b5c37f AM |
164 | long realStart = start; |
165 | ||
166 | if (realStart < fAbsoluteStartTime) { | |
167 | realStart = fAbsoluteStartTime; | |
20ff3b75 | 168 | } |
41b5c37f AM |
169 | if (realStart > fAbsoluteEndTime) { |
170 | realStart = fAbsoluteEndTime - fMinWindowSize; | |
20ff3b75 | 171 | } |
41b5c37f | 172 | return realStart; |
c392540b FC |
173 | } |
174 | ||
175 | private long validateEnd(long start, long end) { | |
41b5c37f AM |
176 | long realEnd = end; |
177 | ||
178 | if (realEnd > fAbsoluteEndTime) { | |
179 | realEnd = fAbsoluteEndTime; | |
20ff3b75 | 180 | } |
41b5c37f AM |
181 | if (realEnd < start + fMinWindowSize) { |
182 | realEnd = start + fMinWindowSize; | |
20ff3b75 | 183 | } |
41b5c37f | 184 | return realEnd; |
c392540b | 185 | } |
c392540b | 186 | } |