1 /* |
|
2 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). |
|
3 * All rights reserved. |
|
4 * This component and the accompanying materials are made available |
|
5 * under the terms of the License "Eclipse Public License v1.0" |
|
6 * which accompanies this distribution, and is available |
|
7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
8 * |
|
9 * Initial Contributors: |
|
10 * Nokia Corporation - initial contribution. |
|
11 * |
|
12 * Contributors: |
|
13 * |
|
14 * Description: Gesture helper implementation |
|
15 * |
|
16 */ |
|
17 |
|
18 #include <e32math.h> |
|
19 #include <rt_uievent.h> |
|
20 #include "filelogger.h" |
|
21 #include "zoomgesturerecogniser.h" |
|
22 #include "GenericSimpleGesture.h" |
|
23 |
|
24 using namespace stmGesture ; |
|
25 |
|
26 _LIT8(KZoomInName, "ZoomIn") ; |
|
27 _LIT8(KZoomOutName, "ZoomOut") ; |
|
28 |
|
29 CZoomGestureRecogniser* CZoomGestureRecogniser::NewL(MGestureListener* aListener) |
|
30 { |
|
31 CZoomGestureRecogniser* self = new (ELeave) CZoomGestureRecogniser(aListener) ; |
|
32 return self; |
|
33 } |
|
34 |
|
35 CZoomGestureRecogniser::CZoomGestureRecogniser(MGestureListener* aListener) : |
|
36 CGestureRecogniser(aListener), m_area(TRect::EUninitialized) |
|
37 { |
|
38 m_rangesizeInPixels = 20 ; // by default 20 pixels from the edges is the area |
|
39 m_zooming = false ; |
|
40 } |
|
41 |
|
42 CZoomGestureRecogniser::~CZoomGestureRecogniser() |
|
43 { |
|
44 } |
|
45 |
|
46 TGestureRecognitionState CZoomGestureRecogniser::recognise(int numOfActiveStreams, |
|
47 MGestureEngineIf* pge) |
|
48 { |
|
49 TGestureRecognitionState state = ENotMyGesture; |
|
50 // Check if we are enabled or not |
|
51 if (!m_gestureEnabled) return state ; |
|
52 |
|
53 // Look at the events to see if it looks like zoom with one pointer |
|
54 if (numOfActiveStreams == 1) |
|
55 { |
|
56 const stmUiEventEngine::MUiEvent* puie = pge->getUiEvents(0); |
|
57 int countOfEvents = puie->countOfEvents(); |
|
58 stmUiEventEngine::TUiEventCode eventCode = puie->Code(); |
|
59 |
|
60 if (m_loggingenabled) |
|
61 { |
|
62 LOGARG("CZoomGestureRecogniser: %d num %d code %d", |
|
63 eventCode, countOfEvents, eventCode); |
|
64 |
|
65 } |
|
66 if (!m_zooming) |
|
67 { |
|
68 // We are not yet zoomin, check if we should start, i.e. whether we are |
|
69 // inside the zoom trigger areas near the corners when touch is done... |
|
70 if (eventCode == stmUiEventEngine::ETouch) // It must be ETouch inside the corner |
|
71 { |
|
72 if (m_loggingenabled) |
|
73 { |
|
74 LOGARG("CZoomGestureRecogniser: 0x%x ETouch: num %d code %d, %d", |
|
75 this, countOfEvents, puie->CurrentXY().iX, puie->CurrentXY().iY); |
|
76 LOGARG("CZoomGestureRecogniser: area, %d,%d %d,%d, range: %d", m_area.iTl.iX, m_area.iTl.iY, m_area.iBr.iX, m_area.iBr.iY, m_rangesizeInPixels); |
|
77 } |
|
78 |
|
79 // the lower left rectangle is m_rangesizeIPixels from the corner |
|
80 TRect lowerleft(m_area.iTl.iX, m_area.iBr.iY-m_rangesizeInPixels, |
|
81 m_area.iTl.iX+m_rangesizeInPixels, m_area.iBr.iY) ; |
|
82 TRect upperright(m_area.iBr.iX-m_rangesizeInPixels, m_area.iTl.iY, |
|
83 m_area.iBr.iX, m_area.iTl.iY+m_rangesizeInPixels) ; |
|
84 |
|
85 m_previoustouch = m_startingtouch = puie->CurrentXY() ; |
|
86 m_delta = 0 ; |
|
87 if (lowerleft.Contains(m_startingtouch) || upperright.Contains(m_startingtouch)) |
|
88 { |
|
89 if (m_loggingenabled) |
|
90 { |
|
91 LOGARG("CZoomGestureRecogniser: ZOOM IN/OUT, (%d,%d) in %d,%d %d,%d, range: %d", |
|
92 m_startingtouch.iX, m_startingtouch.iY, |
|
93 m_area.iTl.iX, m_area.iTl.iY, m_area.iBr.iX, m_area.iBr.iY, |
|
94 m_rangesizeInPixels); |
|
95 } |
|
96 m_zooming = true ; |
|
97 if (lowerleft.Contains(m_startingtouch)) |
|
98 { |
|
99 m_zoomtype = EZoomIn ; |
|
100 } |
|
101 else |
|
102 { |
|
103 m_zoomtype = EZoomOut ; |
|
104 } |
|
105 state = ELockToThisGesture ; // keep zooming until release |
|
106 TTwoPointGesture pgest(KUid, m_startingtouch, m_startingtouch); |
|
107 pgest.setLogging(m_loggingenabled) ; |
|
108 pgest.setDetails(m_delta) ; |
|
109 pgest.setName(m_zoomtype == EZoomIn ? KZoomInName() : KZoomOutName()) ; |
|
110 pgest.setType(m_zoomtype); |
|
111 |
|
112 // Call the listener to inform that a gesture has happened |
|
113 m_listener->gestureEnter(pgest) ; |
|
114 } |
|
115 else |
|
116 { |
|
117 // It is not our gesture so do nothing... |
|
118 } |
|
119 } |
|
120 else |
|
121 { |
|
122 // It is not touch, so not our initiating UI event.. do nothing |
|
123 } |
|
124 } |
|
125 else |
|
126 { |
|
127 // We are already zooming, calculate the changes in zooming factor if it looks we are still zooming |
|
128 if (eventCode == stmUiEventEngine::ERelease) // ERelease stops zooming |
|
129 { |
|
130 // We were zooming, but if there are multiple touches we are not any more |
|
131 m_listener->gestureExit(KUid) ; // should we call this or not? |
|
132 } |
|
133 else // all other UI events will keep on zooming |
|
134 { |
|
135 state = ELockToThisGesture ; // Keep the gesture |
|
136 const TPoint& p = puie->CurrentXY() ; |
|
137 float newdist = calculateDistance(p) ; |
|
138 float olddist = calculateDistance(m_previoustouch) ; |
|
139 m_previoustouch = p ; |
|
140 m_delta = adjustZoom(olddist, newdist) ; |
|
141 state = EGestureActive ; |
|
142 |
|
143 // Inform listener only if there is something to say |
|
144 if (m_delta != 0) |
|
145 { |
|
146 TTwoPointGesture pgest = TTwoPointGesture(KUid, p, m_startingtouch); |
|
147 pgest.setLogging(m_loggingenabled) ; |
|
148 pgest.setDetails(m_delta) ; |
|
149 pgest.setName(m_zoomtype == EZoomIn ? KZoomInName() : KZoomOutName()) ; |
|
150 pgest.setType(m_zoomtype); |
|
151 |
|
152 // Call the listener to inform that a gesture has happened |
|
153 m_listener->gestureEnter(pgest) ; |
|
154 } |
|
155 } |
|
156 } |
|
157 } |
|
158 else |
|
159 { |
|
160 if (m_zooming) |
|
161 { |
|
162 // We were zooming, but if there are multiple touches we are not any more |
|
163 m_listener->gestureExit(KUid) ; // should we call this or not? |
|
164 } |
|
165 m_zooming = false ; |
|
166 } |
|
167 return state; |
|
168 } |
|
169 |
|
170 void CZoomGestureRecogniser::release(MGestureEngineIf*) |
|
171 { |
|
172 if (m_zooming) |
|
173 { |
|
174 m_zooming = false ; |
|
175 m_listener->gestureExit(KUid) ; // should we call this or not? |
|
176 } |
|
177 if (m_loggingenabled) |
|
178 { |
|
179 LOGARG("CZoomGestureRecogniser: 0x%x release", this); |
|
180 } |
|
181 } |
|
182 |
|
183 void CZoomGestureRecogniser::setRange(int rangeInPixels) |
|
184 { |
|
185 m_rangesizeInPixels = rangeInPixels ; |
|
186 } |
|
187 |
|
188 void CZoomGestureRecogniser::setArea(const TRect& theArea) |
|
189 { |
|
190 m_area = theArea ; |
|
191 if (m_loggingenabled) |
|
192 { |
|
193 LOGARG("CZoomGestureRecogniser: set area, %d,%d %d,%d", |
|
194 m_area.iTl.iX, m_area.iTl.iY, m_area.iBr.iX, m_area.iBr.iY); |
|
195 } |
|
196 } |
|
197 |
|
198 /*! |
|
199 * calculate the distance, return as as float |
|
200 */ |
|
201 float CZoomGestureRecogniser::calculateDistance(const TPoint& tp) |
|
202 { |
|
203 double x = ((m_startingtouch.iX-tp.iX)*(m_startingtouch.iX-tp.iX)) + |
|
204 ((m_startingtouch.iY-tp.iY)*(m_startingtouch.iY-tp.iY)) ; |
|
205 double ddist ; |
|
206 Math::Sqrt(ddist, x) ; |
|
207 return ddist ; |
|
208 } |
|
209 |
|
210 int CZoomGestureRecogniser::adjustZoom(float& aPreviousDistance, float aNewDistance) |
|
211 { |
|
212 float diff = aNewDistance - aPreviousDistance ; |
|
213 float logdiff = diff ; |
|
214 if (diff < 0) diff = -diff ; |
|
215 float changePercentage = (diff/aPreviousDistance)*100.f ; |
|
216 if (changePercentage > 10.f) |
|
217 { |
|
218 // change more than 10%, make at most 10% |
|
219 float newdiff = aPreviousDistance*0.1f; |
|
220 if (aPreviousDistance > aNewDistance) newdiff = -newdiff ; |
|
221 if (m_loggingenabled) |
|
222 { |
|
223 LOGARG("CZoomGestureRecogniser: adjust zoom from %f to %f : was, now %f %f", |
|
224 double(logdiff), double(newdiff), double(aPreviousDistance), double(aNewDistance)); |
|
225 } |
|
226 |
|
227 aPreviousDistance = aPreviousDistance + newdiff ; |
|
228 diff = newdiff ; |
|
229 |
|
230 } |
|
231 else |
|
232 { |
|
233 if (m_loggingenabled) |
|
234 { |
|
235 LOGARG("CZoomGestureRecogniser: adjust zoom from %f to %f : was, now %f %f", |
|
236 double(logdiff), double(diff), double(aPreviousDistance), double(aNewDistance)); |
|
237 } |
|
238 aPreviousDistance = aNewDistance ; // accept the new value and update the new length |
|
239 diff = logdiff ; // put the original back |
|
240 } |
|
241 return (int)diff ; |
|
242 } |
|