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39
40#ifndef FOLLOWEMITTER_H
41#define FOLLOWEMITTER_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53#include "qquickparticleemitter_p.h"
54#include "qquickparticleaffector_p.h"
55
56QT_BEGIN_NAMESPACE
57
58class QQuickTrailEmitter : public QQuickParticleEmitter
59{
60 Q_OBJECT
61 Q_PROPERTY(QString follow READ follow WRITE setFollow NOTIFY followChanged)
62 Q_PROPERTY(int emitRatePerParticle READ particlesPerParticlePerSecond WRITE setParticlesPerParticlePerSecond NOTIFY particlesPerParticlePerSecondChanged)
63
64 Q_PROPERTY(QQuickParticleExtruder* emitShape READ emissonShape WRITE setEmissionShape NOTIFY emissionShapeChanged)
65 Q_PROPERTY(qreal emitHeight READ emitterYVariation WRITE setEmitterYVariation NOTIFY emitterYVariationChanged)
66 Q_PROPERTY(qreal emitWidth READ emitterXVariation WRITE setEmitterXVariation NOTIFY emitterXVariationChanged)
67 QML_NAMED_ELEMENT(TrailEmitter)
68
69public:
70 enum EmitSize {
71 ParticleSize = -2//Anything less than 0 will do
72 };
73 Q_ENUM(EmitSize)
74 explicit QQuickTrailEmitter(QQuickItem *parent = 0);
75 void emitWindow(int timeStamp) override;
76 void reset() override;
77
78 int particlesPerParticlePerSecond() const
79 {
80 return m_particlesPerParticlePerSecond;
81 }
82
83 qreal emitterXVariation() const
84 {
85 return m_emitterXVariation;
86 }
87
88 qreal emitterYVariation() const
89 {
90 return m_emitterYVariation;
91 }
92
93 QString follow() const
94 {
95 return m_follow;
96 }
97
98 QQuickParticleExtruder* emissonShape() const
99 {
100 return m_emissionExtruder;
101 }
102
103Q_SIGNALS:
104 void emitFollowParticles(const QJSValue &particles, const QJSValue &followed);
105
106 void particlesPerParticlePerSecondChanged(int arg);
107
108 void emitterXVariationChanged(qreal arg);
109
110 void emitterYVariationChanged(qreal arg);
111
112 void followChanged(const QString &arg);
113
114 void emissionShapeChanged(QQuickParticleExtruder* arg);
115
116public Q_SLOTS:
117
118 void setParticlesPerParticlePerSecond(int arg)
119 {
120 if (m_particlesPerParticlePerSecond != arg) {
121 m_particlesPerParticlePerSecond = arg;
122 Q_EMIT particlesPerParticlePerSecondChanged(arg);
123 }
124 }
125 void setEmitterXVariation(qreal arg)
126 {
127 if (m_emitterXVariation != arg) {
128 m_emitterXVariation = arg;
129 Q_EMIT emitterXVariationChanged(arg);
130 }
131 }
132
133 void setEmitterYVariation(qreal arg)
134 {
135 if (m_emitterYVariation != arg) {
136 m_emitterYVariation = arg;
137 Q_EMIT emitterYVariationChanged(arg);
138 }
139 }
140
141 void setFollow(const QString &arg)
142 {
143 if (m_follow != arg) {
144 m_follow = arg;
145 Q_EMIT followChanged(arg);
146 }
147 }
148
149 void setEmissionShape(QQuickParticleExtruder* arg)
150 {
151 if (m_emissionExtruder != arg) {
152 m_emissionExtruder = arg;
153 Q_EMIT emissionShapeChanged(arg);
154 }
155 }
156
157private Q_SLOTS:
158 void recalcParticlesPerSecond();
159
160private:
161 QSet<QQuickParticleData*> m_pending;
162 QVector<qreal> m_lastEmission;
163 int m_particlesPerParticlePerSecond;
164 qreal m_lastTimeStamp;
165 qreal m_emitterXVariation;
166 qreal m_emitterYVariation;
167 QString m_follow;
168 int m_followCount;
169 QQuickParticleExtruder* m_emissionExtruder;
170 QQuickParticleExtruder* m_defaultEmissionExtruder;
171 bool isEmitFollowConnected();
172};
173
174QT_END_NAMESPACE
175#endif // FOLLOWEMITTER_H
176

source code of qtdeclarative/src/particles/qquicktrailemitter_p.h