【1】滚动条 & 滑块 & 表盘
Qt示例工程：
（1）slidergroup.h
1 #include <QGroupBox>
2
3 QT_BEGIN_NAMESPACE
4 class QDial;
5 class QScrollBar;
6 class QSlider;
7 QT_END_NAMESPACE
8
9 class SlidersGroup : public QGroupBox
10 {
11 Q_OBJECT
12
13 public:
14 SlidersGroup(Qt::Orientation orientation,
15 const QString &title,
16 QWidget *parent = 0);
17
18 signals:
19 void valueChanged(int value);
20
21 public slots:
22 void setValue(int value);
23 void setMinimum(int value);
24 void setMaximum(int value);
25 void invertAppearance(bool invert);
26 void invertKeyBindings(bool invert);
27
28 private:
29 QSlider *m_pSlider;
30 QScrollBar *m_pScrollBar;
31 QDial *m_pDial;
32 };
33
34 #endif
（2）slidergroup.cpp
1 #include <QtWidgets>
2 #include "SlidersGroup.h"
3
4 SlidersGroup::SlidersGroup(Qt::Orientation orientation,
5 const QString &title,
6 QWidget *parent)
7 : QGroupBox(title, parent)
8 {
9 m_pSlider = new QSlider(orientation, this);
10 m_pSlider->setFocusPolicy(Qt::StrongFocus);
11 m_pSlider->setTickPosition(QSlider::TicksBothSides);
12 m_pSlider->setTickInterval(10);
13 m_pSlider->setSingleStep(1);
14
15 m_pScrollBar = new QScrollBar(orientation, this);
16 m_pScrollBar->setFocusPolicy(Qt::StrongFocus);
17
18 m_pDial = new QDial(this);
19 m_pDial->setFocusPolicy(Qt::StrongFocus);
20
21 connect(m_pSlider, &QSlider::valueChanged, m_pScrollBar, &QScrollBar::setValue);
22 connect(m_pScrollBar, &QScrollBar::valueChanged, m_pDial, &QDial::setValue);
23 connect(m_pDial, &QDial::valueChanged, m_pSlider, &QSlider::setValue);
24 connect(m_pDial, &QDial::valueChanged, this, &SlidersGroup::valueChanged);
25
26 QBoxLayout::Direction direction = (Qt::Horizontal == orientation) ? QBoxLayout::TopToBottom : QBoxLayout::LeftToRight;
27
28 QBoxLayout *m_pSlidersLayout = new QBoxLayout(direction, this);
29 m_pSlidersLayout->addWidget(m_pSlider);
30 m_pSlidersLayout->addWidget(m_pScrollBar);
31 m_pSlidersLayout->addWidget(m_pDial);
32 setLayout(m_pSlidersLayout);
33 }
34
35 void SlidersGroup::setValue(int value)
36 {
37 m_pSlider->setValue(value);
38 }
39
40 void SlidersGroup::setMinimum(int value)
41 {
42 m_pSlider->setMinimum(value);
43 m_pScrollBar->setMinimum(value);
44 m_pDial->setMinimum(value);
45 }
46
47 void SlidersGroup::setMaximum(int value)
48 {
49 m_pSlider->setMaximum(value);
50 m_pScrollBar->setMaximum(value);
51 m_pDial->setMaximum(value);
52 }
53
54 void SlidersGroup::invertAppearance(bool invert)
55 {
56 m_pSlider->setInvertedAppearance(invert);
57 m_pScrollBar->setInvertedAppearance(invert);
58 m_pDial->setInvertedAppearance(invert);
59 }
60
61 void SlidersGroup::invertKeyBindings(bool invert)
62 {
63 m_pSlider->setInvertedControls(invert);
64 m_pScrollBar->setInvertedControls(invert);
65 m_pDial->setInvertedControls(invert);
66 }
（3）window.h
1 #ifndef WINDOW_H
2 #define WINDOW_H
3
4 #include <QWidget>
5
6 QT_BEGIN_NAMESPACE
7 class QCheckBox;
8 class QComboBox;
9 class QGroupBox;
10 class QLabel;
11 class QSpinBox;
12 class QStackedWidget;
13 QT_END_NAMESPACE
14 class SlidersGroup;
15
16 class Window : public QWidget
17 {
18 Q_OBJECT
19
20 public:
21 Window();
22
23 private:
24 QSpinBox *createSpinBox();
25 void createControls(const QString &title);
26
27 private:
28 SlidersGroup *m_pHorizontalSliders;
29 SlidersGroup *m_pVerticalSliders;
30 QStackedWidget *m_pStackedWidget;
31
32 QGroupBox *m_pControlsGroup;
33 QLabel *m_pMinimumLabel;
34 QLabel *m_pMaximumLabel;
35 QLabel *m_pValueLabel;
36 QCheckBox *m_pInvertedAppearance;
37 QCheckBox *m_pInvertedKeyBindings;
38 QSpinBox *m_pMinimumSpinBox;
39 QSpinBox *m_pMaximumSpinBox;
40 QSpinBox *m_pValueSpinBox;
41 QComboBox *m_pOrientationCombo;
42 };
43
44 #endif
（4）window.cpp
1 #include <QtWidgets>
2
3 #include "slidersgroup.h"
4 #include "window.h"
5
6 Window::Window()
7 {
8 m_pHorizontalSliders = new SlidersGroup(Qt::Horizontal, tr("Horizontal"), this);
9 m_pVerticalSliders = new SlidersGroup(Qt::Vertical, tr("Vertical"), this);
10
11 m_pStackedWidget = new QStackedWidget(this);
12 m_pStackedWidget->addWidget(m_pHorizontalSliders);
13 m_pStackedWidget->addWidget(m_pVerticalSliders);
14
15 createControls(tr("Controls"));
16
17 connect(m_pHorizontalSliders, &SlidersGroup::valueChanged,
18 m_pVerticalSliders, &SlidersGroup::setValue);
19 connect(m_pVerticalSliders, &SlidersGroup::valueChanged,
20 m_pValueSpinBox, &QSpinBox::setValue);
21 typedef void (QSpinBox::*valueChangedInt)(int);
22 connect(m_pValueSpinBox, static_cast<valueChangedInt>(&QSpinBox::valueChanged),
23 m_pHorizontalSliders, &SlidersGroup::setValue);
24
25 QHBoxLayout *pHLayout = new QHBoxLayout(this);
26 pHLayout->addWidget(m_pControlsGroup);
27 pHLayout->addWidget(m_pStackedWidget);
28 setLayout(pHLayout);
29
30 m_pMinimumSpinBox->setValue(0);
31 m_pMaximumSpinBox->setValue(20);
32 m_pValueSpinBox->setValue(5);
33
34 setWindowTitle(tr("MySliders"));
35 }
36
37 void Window::createControls(const QString &title)
38 {
39 m_pControlsGroup = new QGroupBox(title, this);
40
41 m_pMinimumLabel = new QLabel(tr("Minimum value:"), this);
42 m_pMaximumLabel = new QLabel(tr("Maximum value:"), this);
43 m_pValueLabel = new QLabel(tr("Current value:"), this);
44
45 m_pInvertedAppearance = new QCheckBox(tr("Inverted appearance"), this);
46 m_pInvertedKeyBindings = new QCheckBox(tr("Inverted key bindings"), this);
47
48 m_pMinimumSpinBox = createSpinBox();
49 m_pMaximumSpinBox = createSpinBox();
50 m_pValueSpinBox = createSpinBox();
51
52 m_pOrientationCombo = new QComboBox(this);
53 m_pOrientationCombo->addItem(tr("Horizontal slider-like widgets"));
54 m_pOrientationCombo->addItem(tr("Vertical slider-like widgets"));
55
56 typedef void (QComboBox::*activatedInt)(int);
57 connect(m_pOrientationCombo, static_cast<activatedInt>(&QComboBox::activated),
58 m_pStackedWidget, &QStackedWidget::setCurrentIndex);
59 typedef void (QSpinBox::*valueChangedInt)(int);
60 connect(m_pMinimumSpinBox, static_cast<valueChangedInt>(&QSpinBox::valueChanged),
61 m_pHorizontalSliders, &SlidersGroup::setMinimum);
62 connect(m_pMinimumSpinBox, static_cast<valueChangedInt>(&QSpinBox::valueChanged),
63 m_pVerticalSliders, &SlidersGroup::setMinimum);
64 connect(m_pMaximumSpinBox, static_cast<valueChangedInt>(&QSpinBox::valueChanged),
65 m_pHorizontalSliders, &SlidersGroup::setMaximum);
66 connect(m_pMaximumSpinBox, static_cast<valueChangedInt>(&QSpinBox::valueChanged),
67 m_pVerticalSliders, &SlidersGroup::setMaximum);
68 connect(m_pInvertedAppearance, &QCheckBox::toggled,
69 m_pHorizontalSliders, &SlidersGroup::invertAppearance);
70 connect(m_pInvertedAppearance, &QCheckBox::toggled,
71 m_pVerticalSliders, &SlidersGroup::invertAppearance);
72 connect(m_pInvertedKeyBindings, &QCheckBox::toggled,
73 m_pHorizontalSliders, &SlidersGroup::invertKeyBindings);
74 connect(m_pInvertedKeyBindings, &QCheckBox::toggled,
75 m_pVerticalSliders, &SlidersGroup::invertKeyBindings);
76
77 QGridLayout *pControlsLayout = new QGridLayout(this);
78 pControlsLayout->addWidget(m_pMinimumLabel, 0, 0);
79 pControlsLayout->addWidget(m_pMaximumLabel, 1, 0);
80 pControlsLayout->addWidget(m_pValueLabel, 2, 0);
81 pControlsLayout->addWidget(m_pMinimumSpinBox, 0, 1);
82 pControlsLayout->addWidget(m_pMaximumSpinBox, 1, 1);
83 pControlsLayout->addWidget(m_pValueSpinBox, 2, 1);
84 pControlsLayout->addWidget(m_pInvertedAppearance, 0, 2);
85 pControlsLayout->addWidget(m_pInvertedKeyBindings, 1, 2);
86 pControlsLayout->addWidget(m_pOrientationCombo, 3, 0, 1, 3);
87 m_pControlsGroup->setLayout(pControlsLayout);
88 }
89
90 QSpinBox* Window::createSpinBox()
91 {
92 QSpinBox *pValueSpinBox = new QSpinBox(this);
93 pValueSpinBox->setRange(-100, 100);
94 pValueSpinBox->setSingleStep(1);
95 return pValueSpinBox;
96 }
（5）main.cpp
1 #include <QApplication>
2 #include "window.h"
3
4 int main(int argc, char *argv[])
5 {
6 QApplication app(argc, argv);
7 Window window;
8 window.show();
9 return app.exec();
10 }
注意：代码已很简洁，没有再加注释。
【2】运行效果
水平滚动条：
垂直滚动条：
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顺序 选择 循环 总结
时间： 2024-10-20 03:39:45