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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 |
c392540b FC |
13 | *******************************************************************************/ |
14 | ||
e0752744 | 15 | package org.eclipse.linuxtools.tmf.ui.views.histogram; |
c392540b | 16 | |
ba1f5c20 PT |
17 | import org.eclipse.swt.events.KeyEvent; |
18 | import org.eclipse.swt.events.KeyListener; | |
c392540b FC |
19 | import org.eclipse.swt.events.MouseEvent; |
20 | import org.eclipse.swt.events.MouseWheelListener; | |
c392540b FC |
21 | |
22 | /** | |
b544077e | 23 | * Class to handle zooming within histogram windows.. |
20ff3b75 | 24 | * |
b544077e BH |
25 | * @version 1.0 |
26 | * @author Francois Chouinard | |
c392540b | 27 | * <p> |
c392540b | 28 | */ |
ba1f5c20 | 29 | public class HistogramZoom implements MouseWheelListener, KeyListener { |
c392540b FC |
30 | |
31 | // ------------------------------------------------------------------------ | |
32 | // Constants | |
33 | // ------------------------------------------------------------------------ | |
34 | ||
35 | private final static double ZOOM_FACTOR = 0.8; | |
36 | ||
37 | // ------------------------------------------------------------------------ | |
38 | // Attributes | |
39 | // ------------------------------------------------------------------------ | |
40 | ||
41 | private final Histogram fHistogram; | |
c392540b FC |
42 | |
43 | private long fAbsoluteStartTime; | |
44 | private long fAbsoluteEndTime; | |
45 | private final long fMinWindowSize; | |
46 | ||
47 | private long fRangeStartTime; | |
48 | private long fRangeDuration; | |
49 | ||
c392540b | 50 | // ------------------------------------------------------------------------ |
e0752744 | 51 | // Constructors |
c392540b FC |
52 | // ------------------------------------------------------------------------ |
53 | ||
20ff3b75 AM |
54 | /** |
55 | * Standard constructor. | |
56 | * | |
57 | * @param histogram | |
58 | * The parent histogram object | |
20ff3b75 AM |
59 | * @param start |
60 | * The start time of the zoom area | |
61 | * @param end | |
62 | * The end time of the zoom area | |
65cdf787 | 63 | * @since 2.0 |
20ff3b75 | 64 | */ |
65cdf787 | 65 | public HistogramZoom(Histogram histogram, long start, long end) { |
c392540b | 66 | fHistogram = histogram; |
c392540b FC |
67 | fAbsoluteStartTime = start; |
68 | fAbsoluteEndTime = end; | |
65cdf787 | 69 | fMinWindowSize = 0; |
c392540b FC |
70 | |
71 | fRangeStartTime = fAbsoluteStartTime; | |
72 | fRangeDuration = fAbsoluteStartTime + fMinWindowSize; | |
ba1f5c20 PT |
73 | |
74 | histogram.addMouseWheelListener(this); | |
75 | histogram.addKeyListener(this); | |
c392540b FC |
76 | } |
77 | ||
78 | // ------------------------------------------------------------------------ | |
79 | // Accessors | |
80 | // ------------------------------------------------------------------------ | |
81 | ||
b544077e BH |
82 | /** |
83 | * Get start time of the zoom window. | |
84 | * @return the start time. | |
85 | */ | |
5a5c2fc7 | 86 | public synchronized long getStartTime() { |
c392540b FC |
87 | return fRangeStartTime; |
88 | } | |
89 | ||
b544077e BH |
90 | /** |
91 | * Get the end time of the zoom window. | |
92 | * @return the end time | |
93 | */ | |
5a5c2fc7 | 94 | public synchronized long getEndTime() { |
c392540b FC |
95 | return fRangeStartTime + fRangeDuration; |
96 | } | |
97 | ||
b544077e BH |
98 | /** |
99 | * Get the duration of the zoom window. | |
100 | * @return the duration of the zoom window. | |
101 | */ | |
5a5c2fc7 | 102 | public synchronized long getDuration() { |
c392540b FC |
103 | return fRangeDuration; |
104 | } | |
105 | ||
106 | // ------------------------------------------------------------------------ | |
107 | // Operations | |
108 | // ------------------------------------------------------------------------ | |
109 | ||
b544077e BH |
110 | /** |
111 | * The the full time range of the histogram | |
20ff3b75 | 112 | * |
b544077e BH |
113 | * @param startTime the start time the histogram |
114 | * @param endTime the end time of the histogram | |
115 | */ | |
8edafa7f | 116 | public synchronized void setFullRange(long startTime, long endTime) { |
c392540b FC |
117 | fAbsoluteStartTime = startTime; |
118 | fAbsoluteEndTime = endTime; | |
119 | } | |
120 | ||
b544077e BH |
121 | /** |
122 | * Sets the new zoom window | |
123 | * @param startTime the start time | |
124 | * @param duration the duration | |
125 | */ | |
8edafa7f | 126 | public synchronized void setNewRange(long startTime, long duration) { |
41b5c37f AM |
127 | long realStart = startTime; |
128 | ||
129 | if (realStart < fAbsoluteStartTime) { | |
130 | realStart = fAbsoluteStartTime; | |
20ff3b75 | 131 | } |
c392540b | 132 | |
41b5c37f | 133 | long endTime = realStart + duration; |
c392540b FC |
134 | if (endTime > fAbsoluteEndTime) { |
135 | endTime = fAbsoluteEndTime; | |
20ff3b75 | 136 | if (endTime - duration > fAbsoluteStartTime) { |
41b5c37f | 137 | realStart = endTime - duration; |
20ff3b75 | 138 | } else { |
41b5c37f | 139 | realStart = fAbsoluteStartTime; |
c392540b FC |
140 | } |
141 | } | |
142 | ||
41b5c37f AM |
143 | fRangeStartTime = realStart; |
144 | fRangeDuration = endTime - realStart; | |
c392540b FC |
145 | } |
146 | ||
147 | // ------------------------------------------------------------------------ | |
148 | // MouseWheelListener | |
149 | // ------------------------------------------------------------------------ | |
150 | ||
c392540b | 151 | @Override |
ba1f5c20 | 152 | public void mouseScrolled(MouseEvent event) { |
38df2c82 | 153 | zoom(event.count); |
c392540b FC |
154 | } |
155 | ||
ba1f5c20 PT |
156 | /** |
157 | * @since 3.1 | |
158 | */ | |
159 | @Override | |
160 | public void keyPressed(KeyEvent e) { | |
161 | if (e.character == '+') { | |
162 | zoom(1); | |
163 | } else if (e.character == '-') { | |
164 | zoom(-1); | |
165 | } | |
166 | } | |
167 | ||
168 | /** | |
169 | * @since 3.1 | |
170 | */ | |
171 | @Override | |
172 | public void keyReleased(KeyEvent e) { | |
173 | } | |
174 | ||
c392540b | 175 | private synchronized void zoom(int nbClicks) { |
c392540b FC |
176 | // Compute the new time range |
177 | long requestedRange = (nbClicks > 0) ? Math.round(ZOOM_FACTOR * fRangeDuration) : (long) Math.ceil(fRangeDuration * (1.0 / ZOOM_FACTOR)); | |
178 | ||
bd6307ff | 179 | // Distribute delta and adjust for boundaries |
83f4e378 | 180 | long requestedStart = validateStart(fRangeStartTime + (fRangeDuration - requestedRange) / 2); |
c392540b FC |
181 | long requestedEnd = validateEnd(requestedStart, requestedStart + requestedRange); |
182 | requestedStart = validateStart(requestedEnd - requestedRange); | |
183 | ||
184 | fHistogram.updateTimeRange(requestedStart, requestedEnd); | |
185 | } | |
186 | ||
187 | private long validateStart(long start) { | |
41b5c37f AM |
188 | long realStart = start; |
189 | ||
190 | if (realStart < fAbsoluteStartTime) { | |
191 | realStart = fAbsoluteStartTime; | |
20ff3b75 | 192 | } |
41b5c37f AM |
193 | if (realStart > fAbsoluteEndTime) { |
194 | realStart = fAbsoluteEndTime - fMinWindowSize; | |
20ff3b75 | 195 | } |
41b5c37f | 196 | return realStart; |
c392540b FC |
197 | } |
198 | ||
199 | private long validateEnd(long start, long end) { | |
41b5c37f AM |
200 | long realEnd = end; |
201 | ||
202 | if (realEnd > fAbsoluteEndTime) { | |
203 | realEnd = fAbsoluteEndTime; | |
20ff3b75 | 204 | } |
41b5c37f AM |
205 | if (realEnd < start + fMinWindowSize) { |
206 | realEnd = start + fMinWindowSize; | |
20ff3b75 | 207 | } |
41b5c37f | 208 | return realEnd; |
c392540b | 209 | } |
c392540b | 210 | } |