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39
40#ifndef QVARIANTANIMATION_P_H
41#define QVARIANTANIMATION_P_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
54#include "qvariantanimation.h"
55#include <QtCore/qeasingcurve.h>
56#include <QtCore/qmetaobject.h>
57#include <QtCore/qvector.h>
58
59#include "private/qabstractanimation_p.h"
60
61#include <type_traits>
62
63QT_REQUIRE_CONFIG(animation);
64
65QT_BEGIN_NAMESPACE
66
67class QVariantAnimationPrivate : public QAbstractAnimationPrivate
68{
69 Q_DECLARE_PUBLIC(QVariantAnimation)
70public:
71
72 QVariantAnimationPrivate();
73
74 static QVariantAnimationPrivate *get(QVariantAnimation *q)
75 {
76 return q->d_func();
77 }
78
79 void setDefaultStartEndValue(const QVariant &value);
80
81
82 QVariant currentValue;
83 QVariant defaultStartEndValue;
84
85 //this is used to keep track of the KeyValue interval in which we currently are
86 struct
87 {
88 QVariantAnimation::KeyValue start, end;
89 } currentInterval;
90
91 QEasingCurve easing;
92 int duration;
93 QVariantAnimation::KeyValues keyValues;
94 QVariantAnimation::Interpolator interpolator;
95
96 void setCurrentValueForProgress(const qreal progress);
97 void recalculateCurrentInterval(bool force=false);
98 void setValueAt(qreal, const QVariant &);
99 QVariant valueAt(qreal step) const;
100 void convertValues(int t);
101
102 void updateInterpolator();
103
104 //XXX this is needed by dui
105 static Q_CORE_EXPORT QVariantAnimation::Interpolator getInterpolator(int interpolationType);
106};
107
108//this should make the interpolation faster
109template<typename T>
110typename std::enable_if<std::is_unsigned<T>::value, T>::type
111_q_interpolate(const T &f, const T &t, qreal progress)
112{
113 return T(f + t * progress - f * progress);
114}
115
116// the below will apply also to all non-arithmetic types
117template<typename T>
118typename std::enable_if<!std::is_unsigned<T>::value, T>::type
119_q_interpolate(const T &f, const T &t, qreal progress)
120{
121 return T(f + (t - f) * progress);
122}
123
124template<typename T > inline QVariant _q_interpolateVariant(const T &from, const T &to, qreal progress)
125{
126 return _q_interpolate(from, to, progress);
127}
128
129
130QT_END_NAMESPACE
131
132#endif //QVARIANTANIMATION_P_H
133

source code of qtbase/src/corelib/animation/qvariantanimation_p.h