C++ 如何根据QListWidget上的选择在QStackedWidget上显示正确的GUI

如何根据

QListWidget

上的选择在

QStacked小部件上正确显示正确的用户界面

下面我有一个
QDialog
，其中包含：

1 QListWidget

1 QStackedWidget


根据列表的选择，例如，船舶定位系统或输出界面应如下所示，但问题是不幸的是，
QStacked小部件
当前没有改变
QWidgets
，因为我选择了
QListWidgets
，实际上没有显示任何内容。只要克隆它，它就会工作：


代码如下：

选项对话框.h

#include <QDialog>
#include "vesselpossystemwidget.h"
#include "outputdialog.h"
#include "sonarsystem.h"
namespace Ui {
class OptionsDialog;
}

class OptionsDialog : public QDialog
{
    Q_OBJECT
public:
    explicit OptionsDialog(QWidget *parent = nullptr);
    ~OptionsDialog();

private:
    Ui::OptionsDialog *ui;
    VesselPosSystemWidget *mVesPos;
    OutputDialog *mOutput;
    SonarSystem *mSonar;
};

#endif // OPTIONSDIALOG_H

#include "optionsdialog.h"
#include "ui_optionsdialog.h"

OptionsDialog::OptionsDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::OptionsDialog)
{
    ui->setupUi(this);
    switch(ui->stackedWidget->currentIndex()){

      case 0:
        // Go to positioning system
        mVesPos = new VesselPosSystemWidget();
        mVesPos->show();
        break;
      case 1:
        // Go to sonar set up...
        mSonar = new SonarSystem();
        mSonar->show();
        break;
      case 2:
        // Go to output
        mOutput = new OutputDialog();
        mOutput->show();
        break;
      default:
        break;
    }
}

OptionsDialog::~OptionsDialog()
{
    delete ui;
}

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class VesselPosSystemWidget; }
QT_END_NAMESPACE

class VesselPosSystemWidget : public QWidget
{
    Q_OBJECT

public:
    VesselPosSystemWidget(QWidget *parent = nullptr);
    ~VesselPosSystemWidget();

private:
    Ui::VesselPosSystemWidget *ui;
};
#endif // VESSELPOSSYSTEMWIDGET_H

#include <QDialog>

namespace Ui {
class OutputDialog;
}

class OutputDialog : public QDialog
{
    Q_OBJECT

public:
    explicit OutputDialog(QWidget *parent = nullptr);
    ~OutputDialog();

private:
    Ui::OutputDialog *ui;
};

#endif // OUTPUTDIALOG_H

vesselposwidget.h

#include <QDialog>
#include "vesselpossystemwidget.h"
#include "outputdialog.h"
#include "sonarsystem.h"
namespace Ui {
class OptionsDialog;
}

class OptionsDialog : public QDialog
{
    Q_OBJECT
public:
    explicit OptionsDialog(QWidget *parent = nullptr);
    ~OptionsDialog();

private:
    Ui::OptionsDialog *ui;
    VesselPosSystemWidget *mVesPos;
    OutputDialog *mOutput;
    SonarSystem *mSonar;
};

#endif // OPTIONSDIALOG_H

#include "optionsdialog.h"
#include "ui_optionsdialog.h"

OptionsDialog::OptionsDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::OptionsDialog)
{
    ui->setupUi(this);
    switch(ui->stackedWidget->currentIndex()){

      case 0:
        // Go to positioning system
        mVesPos = new VesselPosSystemWidget();
        mVesPos->show();
        break;
      case 1:
        // Go to sonar set up...
        mSonar = new SonarSystem();
        mSonar->show();
        break;
      case 2:
        // Go to output
        mOutput = new OutputDialog();
        mOutput->show();
        break;
      default:
        break;
    }
}

OptionsDialog::~OptionsDialog()
{
    delete ui;
}

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class VesselPosSystemWidget; }
QT_END_NAMESPACE

class VesselPosSystemWidget : public QWidget
{
    Q_OBJECT

public:
    VesselPosSystemWidget(QWidget *parent = nullptr);
    ~VesselPosSystemWidget();

private:
    Ui::VesselPosSystemWidget *ui;
};
#endif // VESSELPOSSYSTEMWIDGET_H

#include <QDialog>

namespace Ui {
class OutputDialog;
}

class OutputDialog : public QDialog
{
    Q_OBJECT

public:
    explicit OutputDialog(QWidget *parent = nullptr);
    ~OutputDialog();

private:
    Ui::OutputDialog *ui;
};

#endif // OUTPUTDIALOG_H

输出.h

#include <QDialog>
#include "vesselpossystemwidget.h"
#include "outputdialog.h"
#include "sonarsystem.h"
namespace Ui {
class OptionsDialog;
}

class OptionsDialog : public QDialog
{
    Q_OBJECT
public:
    explicit OptionsDialog(QWidget *parent = nullptr);
    ~OptionsDialog();

private:
    Ui::OptionsDialog *ui;
    VesselPosSystemWidget *mVesPos;
    OutputDialog *mOutput;
    SonarSystem *mSonar;
};

#endif // OPTIONSDIALOG_H

#include "optionsdialog.h"
#include "ui_optionsdialog.h"

OptionsDialog::OptionsDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::OptionsDialog)
{
    ui->setupUi(this);
    switch(ui->stackedWidget->currentIndex()){

      case 0:
        // Go to positioning system
        mVesPos = new VesselPosSystemWidget();
        mVesPos->show();
        break;
      case 1:
        // Go to sonar set up...
        mSonar = new SonarSystem();
        mSonar->show();
        break;
      case 2:
        // Go to output
        mOutput = new OutputDialog();
        mOutput->show();
        break;
      default:
        break;
    }
}

OptionsDialog::~OptionsDialog()
{
    delete ui;
}

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class VesselPosSystemWidget; }
QT_END_NAMESPACE

class VesselPosSystemWidget : public QWidget
{
    Q_OBJECT

public:
    VesselPosSystemWidget(QWidget *parent = nullptr);
    ~VesselPosSystemWidget();

private:
    Ui::VesselPosSystemWidget *ui;
};
#endif // VESSELPOSSYSTEMWIDGET_H

#include <QDialog>

namespace Ui {
class OutputDialog;
}

class OutputDialog : public QDialog
{
    Q_OBJECT

public:
    explicit OutputDialog(QWidget *parent = nullptr);
    ~OutputDialog();

private:
    Ui::OutputDialog *ui;
};

#endif // OUTPUTDIALOG_H

到目前为止我所做的：

我正在探索使用
QStacked Widget
的可能性，因为我对它不太熟悉，想用一个基本的例子来练习。我在调查，而且

另外，从源代码中，我还阅读了更多的文档。然而，我不能完全清楚地理解这个特定小部件的使用

除此之外，我还尝试了一个
开关盒
循环，如我在代码上所示，但我不确定为什么它不起作用

根据
QListWidget
上的选择，任何人都可以提供一些关于如何在
QStacked Widget
上正确显示用户界面的指导吗？任何解决这个问题的方法都值得赞赏。
A是一个容器小部件，用于多个子小部件，一次只显示其中一个

因此，应立即添加所有子窗口小部件

currentIndex
可用于控制其中哪些当前可见

A为了演示这一点–
testQStackedWidgetMin.cc
：

// Qt header:
#include <QtWidgets>

// main application
int main(int argc, char **argv)
{
  qDebug() << "Qt Version:" << QT_VERSION_STR;
  QApplication app(argc, argv);
  // setup GUI
  QWidget qWinMain;
  QHBoxLayout qHBox;
  QListWidget qList;
  qList.addItem(QString::fromUtf8("Config. 1"));
  qList.addItem(QString::fromUtf8("Config. 2"));
  qList.addItem(QString::fromUtf8("Output"));
  qHBox.addWidget(&qList);
  QStackedWidget qStack;
  QLabel qConfig1(QString::fromUtf8("<b>Config Page 1</b>"));
  qStack.addWidget(&qConfig1);
  QLabel qConfig2(QString::fromUtf8("<b>Config Page 2</b>"));
  qStack.addWidget(&qConfig2);
  QLabel qOutput(QString::fromUtf8("<b>Output Page</b>"));
  qStack.addWidget(&qOutput);
  qHBox.addWidget(&qStack, 1);
  qWinMain.setLayout(&qHBox);
  qWinMain.show();
  // install signal handlers
  QObject::connect(&qList, &QListWidget::currentRowChanged,
    &qStack, &QStackedWidget::setCurrentIndex);
  // runtime loop
  return app.exec();
}

// Qt header:
#include <QtWidgets>

class Config1: public QWidget {
  private:
    // GUI
    QVBoxLayout _qVBox;
    QLabel _qLbl;

  public:
    // constructor.
    Config1();
    // destructor.
    virtual ~Config1() = default;
    // disabled:
    Config1(const Config1&) = delete;
    Config1& operator=(const Config1&) = delete;
};


Config1::Config1(): QWidget()
{
  // setup GUI
  _qLbl.setText(QString::fromUtf8("<b>Config Page 1</b>"));
  _qVBox.addWidget(&_qLbl);
  setLayout(&_qVBox);
}

class Config2: public QWidget {
  private:
    // GUI
    QVBoxLayout _qVBox;
    QLabel _qLbl;

  public:
    // constructor.
    Config2();
    // destructor.
    virtual ~Config2() = default;
    // disabled:
    Config2(const Config2&) = delete;
    Config2& operator=(const Config2&) = delete;
};

Config2::Config2(): QWidget()
{
  _qLbl.setText(QString::fromUtf8("<b>Config Page 2</b>"));
  _qVBox.addWidget(&_qLbl);
  setLayout(&_qVBox);
}

class Output: public QWidget {
  private:
    // GUI
    QVBoxLayout _qVBox;
    QLabel _qLbl;

  public:
    // constructor.
    Output();
    // destructor.
    virtual ~Output() = default;
    // disabled:
    Output(const Output&) = delete;
    Output& operator=(const Output&) = delete;
};

Output::Output(): QWidget()
{
  _qLbl.setText(QString::fromUtf8("<b>Output Page</b>"));
  _qVBox.addWidget(&_qLbl);
  setLayout(&_qVBox);
}

class OptionDialog: public QDialog {
  private:
    // GUI
    QHBoxLayout _qHBox;
    QListWidget _qList;
    QStackedWidget _qStack;
    Config1 _qConfig1;
    Config2 _qConfig2;
    Output _qOutput;

  public:
    // constructor.
    OptionDialog();
    // destructor.
    virtual ~OptionDialog() = default;
    // disabled:
    OptionDialog(const OptionDialog&) = delete;
    OptionDialog& operator=(const OptionDialog&) = delete;
};

OptionDialog::OptionDialog(): QDialog()
{
  // setup GUI
  _qList.addItem(QString::fromUtf8("Config. 1"));
  _qList.addItem(QString::fromUtf8("Config. 2"));
  _qList.addItem(QString::fromUtf8("Output"));
  _qHBox.addWidget(&_qList);
  _qStack.addWidget(&_qConfig1);
  _qStack.addWidget(&_qConfig2);
  _qStack.addWidget(&_qOutput);
  _qHBox.addWidget(&_qStack, 1);
  setLayout(&_qHBox);
  // install signal handlers
  QObject::connect(&_qList, &QListWidget::currentRowChanged,
    &_qStack, &QStackedWidget::setCurrentIndex);
}

// main application
int main(int argc, char **argv)
{
  qDebug() << "Qt Version:" << QT_VERSION_STR;
  QApplication app(argc, argv);
  // setup GUI
  OptionDialog qDlgOpt;
  qDlgOpt.show();
  // runtime loop
  return app.exec();
}

QListWidget qList
的信号连接到
QStackedWidget qStack
的功能。
这负责更新
qList
中任何（交互式）行更改的
qStack


根据OP–
testQStackedWidget.cc
的意图，这是一个不太简单的示例：

// Qt header:
#include <QtWidgets>

// main application
int main(int argc, char **argv)
{
  qDebug() << "Qt Version:" << QT_VERSION_STR;
  QApplication app(argc, argv);
  // setup GUI
  QWidget qWinMain;
  QHBoxLayout qHBox;
  QListWidget qList;
  qList.addItem(QString::fromUtf8("Config. 1"));
  qList.addItem(QString::fromUtf8("Config. 2"));
  qList.addItem(QString::fromUtf8("Output"));
  qHBox.addWidget(&qList);
  QStackedWidget qStack;
  QLabel qConfig1(QString::fromUtf8("<b>Config Page 1</b>"));
  qStack.addWidget(&qConfig1);
  QLabel qConfig2(QString::fromUtf8("<b>Config Page 2</b>"));
  qStack.addWidget(&qConfig2);
  QLabel qOutput(QString::fromUtf8("<b>Output Page</b>"));
  qStack.addWidget(&qOutput);
  qHBox.addWidget(&qStack, 1);
  qWinMain.setLayout(&qHBox);
  qWinMain.show();
  // install signal handlers
  QObject::connect(&qList, &QListWidget::currentRowChanged,
    &qStack, &QStackedWidget::setCurrentIndex);
  // runtime loop
  return app.exec();
}

// Qt header:
#include <QtWidgets>

class Config1: public QWidget {
  private:
    // GUI
    QVBoxLayout _qVBox;
    QLabel _qLbl;

  public:
    // constructor.
    Config1();
    // destructor.
    virtual ~Config1() = default;
    // disabled:
    Config1(const Config1&) = delete;
    Config1& operator=(const Config1&) = delete;
};


Config1::Config1(): QWidget()
{
  // setup GUI
  _qLbl.setText(QString::fromUtf8("<b>Config Page 1</b>"));
  _qVBox.addWidget(&_qLbl);
  setLayout(&_qVBox);
}

class Config2: public QWidget {
  private:
    // GUI
    QVBoxLayout _qVBox;
    QLabel _qLbl;

  public:
    // constructor.
    Config2();
    // destructor.
    virtual ~Config2() = default;
    // disabled:
    Config2(const Config2&) = delete;
    Config2& operator=(const Config2&) = delete;
};

Config2::Config2(): QWidget()
{
  _qLbl.setText(QString::fromUtf8("<b>Config Page 2</b>"));
  _qVBox.addWidget(&_qLbl);
  setLayout(&_qVBox);
}

class Output: public QWidget {
  private:
    // GUI
    QVBoxLayout _qVBox;
    QLabel _qLbl;

  public:
    // constructor.
    Output();
    // destructor.
    virtual ~Output() = default;
    // disabled:
    Output(const Output&) = delete;
    Output& operator=(const Output&) = delete;
};

Output::Output(): QWidget()
{
  _qLbl.setText(QString::fromUtf8("<b>Output Page</b>"));
  _qVBox.addWidget(&_qLbl);
  setLayout(&_qVBox);
}

class OptionDialog: public QDialog {
  private:
    // GUI
    QHBoxLayout _qHBox;
    QListWidget _qList;
    QStackedWidget _qStack;
    Config1 _qConfig1;
    Config2 _qConfig2;
    Output _qOutput;

  public:
    // constructor.
    OptionDialog();
    // destructor.
    virtual ~OptionDialog() = default;
    // disabled:
    OptionDialog(const OptionDialog&) = delete;
    OptionDialog& operator=(const OptionDialog&) = delete;
};

OptionDialog::OptionDialog(): QDialog()
{
  // setup GUI
  _qList.addItem(QString::fromUtf8("Config. 1"));
  _qList.addItem(QString::fromUtf8("Config. 2"));
  _qList.addItem(QString::fromUtf8("Output"));
  _qHBox.addWidget(&_qList);
  _qStack.addWidget(&_qConfig1);
  _qStack.addWidget(&_qConfig2);
  _qStack.addWidget(&_qOutput);
  _qHBox.addWidget(&_qStack, 1);
  setLayout(&_qHBox);
  // install signal handlers
  QObject::connect(&_qList, &QListWidget::currentRowChanged,
    &_qStack, &QStackedWidget::setCurrentIndex);
}

// main application
int main(int argc, char **argv)
{
  qDebug() << "Qt Version:" << QT_VERSION_STR;
  QApplication app(argc, argv);
  // setup GUI
  OptionDialog qDlgOpt;
  qDlgOpt.show();
  // runtime loop
  return app.exec();
}

目前还没有。在MCVE中，您将删除既不是
QStackedWidget
也不是
QListWidget
的所有小部件。堆叠一些简单的
QLabel
s就足以说明
QStackedWidget
是否显示了所需的页面。您是否知道您试图将
QDialog
“OutputDialog”添加到
QStackedWidget
？我怀疑这是否会产生预期的结果。您应该制作另一个类的“OutputDialog”，例如
QWidget
。非常感谢您抽出时间来编写这个非常详细的示例。不同的版本让我更好地理解了
QStackedWidget
的使用，以及显示正确界面的逻辑是如何工作的！非常非常感谢！！：）