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39
40#ifndef QQUICKRANGEMODEL_P_P_H
41#define QQUICKRANGEMODEL_P_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt Components 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 "qquickrangemodel_p.h"
55
56QT_BEGIN_NAMESPACE
57
58class QQuickRangeModel1Private
59{
60 Q_DECLARE_PUBLIC(QQuickRangeModel1)
61public:
62 QQuickRangeModel1Private(QQuickRangeModel1 *qq);
63 virtual ~QQuickRangeModel1Private();
64
65 void init();
66
67 qreal posatmin, posatmax;
68 qreal minimum, maximum, stepSize, pos, value;
69
70 uint inverted : 1;
71
72 QQuickRangeModel1 *q_ptr;
73 bool isComplete;
74 bool positionChanged;
75 bool valueChanged;
76
77 inline qreal effectivePosAtMin() const {
78 return inverted ? posatmax : posatmin;
79 }
80
81 inline qreal effectivePosAtMax() const {
82 return inverted ? posatmin : posatmax;
83 }
84
85 inline qreal equivalentPosition(qreal value) const {
86 // Return absolute position from absolute value
87 const qreal valueRange = maximum - minimum;
88 if (valueRange == 0)
89 return effectivePosAtMin();
90
91 const qreal scale = (effectivePosAtMax() - effectivePosAtMin()) / valueRange;
92 return (value - minimum) * scale + effectivePosAtMin();
93 }
94
95 inline qreal equivalentValue(qreal pos) const {
96 // Return absolute value from absolute position
97 const qreal posRange = effectivePosAtMax() - effectivePosAtMin();
98 if (posRange == 0)
99 return minimum;
100
101 const qreal scale = (maximum - minimum) / posRange;
102 // Avoid perverse rounding glitches when at an end:
103 const qreal mid = (effectivePosAtMax() + effectivePosAtMin()) * 0.5;
104 if (pos < mid)
105 return (pos - effectivePosAtMin()) * scale + minimum;
106 return maximum - scale * (effectivePosAtMax() - pos);
107 }
108
109 qreal publicPosition(qreal position) const;
110 qreal publicValue(qreal value) const;
111 void emitValueAndPositionIfChanged(const qreal oldValue, const qreal oldPosition);
112};
113
114QT_END_NAMESPACE
115
116#endif // QQUICKRANGEMODEL_P_P_H
117

source code of qtquickcontrols/src/controls/Private/qquickrangemodel_p_p.h