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  • QScrollBar & QSlider & QDial

    【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:

    Good Good Study, Day Day Up.

    顺序 选择 循环 总结

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  • 原文地址:https://www.cnblogs.com/Braveliu/p/7495996.html
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