Question

在我的应用程序中，我正在使用C ++和QT进行开发，我正在尝试使用用户导入的图像和小部件来保存GUI的状态，以便当用户退出并且应用程序再次启动时，它会“确切地说，用户离开时图像和小部件完全存储在用户放置的相同位置。

图像存储在QLabels中。我一直试图使用我已经看过的QSettings示例代码，但它根本不工作。有关如何保存整个GUI状态的任何想法，用户可以直接导入小部件和图像。干杯：）

这是我迄今为止开发的源代码

#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QMessageBox>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    // Load state of GUI
    read_settings();
    ui->setupUi(this);

    // Set up the window size
    this->setWindowTitle(QString::fromUtf8("Raspberry PI GUI v1.0"));
    this->resize(800, 400);

    //-------------------------------------------
    // Setting up buttons on the main screen
    //-------------------------------------------
    // Add label
    button = new QPushButton("Add Graphic", this);
    button->setGeometry(QRect(QPoint(10, 20), QSize(200, 50)));
    button->show();

    // Add LED
    button = new QPushButton("Add LCD", this);
    button->setGeometry(QRect(QPoint(10, 80), QSize(200, 50)));
    button->show();
    QObject::connect(button, &QPushButton::clicked, this, &MainWindow::input_led);

    // Add Next Window
    button = new QPushButton("New Window", this);
    button->setGeometry(QRect(QPoint(10, 140), QSize(200, 50)));
    button->show();
    //QObject::connect(button, SIGNAL(pressed()), this, SLOT(input_newwindow()));
    QObject::connect(button, &QPushButton::clicked, this, &MainWindow::input_newwindow);

    // Add plot
    button = new QPushButton("Add Plot", this);
    button->setGeometry(QRect(QPoint(10, 200), QSize(200, 50)));
    button->show();
    QObject::connect(button, &QPushButton::clicked, this, &MainWindow::input_plot);

}

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


void MainWindow::close_event(QCloseEvent *event)
{
    write_settings();
    event->accept();
}

void MainWindow::write_settings()
{
    QSettings settings("reaffer Soft", "reafferApp");

    settings.beginGroup("MainWindow");
    settings.setValue("size", size());
    settings.setValue("pos", pos());
    settings.endGroup();
}

void MainWindow::read_settings()
{
    QSettings settings("reaffer Soft", "reafferApp");

    settings.beginGroup("MainWindow");
    resize(settings.value("size", QSize(800, 400)).toSize());
    move(settings.value("pos", QPoint(200, 200)).toPoint());
    settings.endGroup();
}


void MainWindow::input_label()
{
    Label *label = new Label(this);
    label->setText("New Graphic");
    label->show();
}

void MainWindow::input_led()
{
    LED *led = new LED(this);
    led->show();
}

void MainWindow::input_newwindow()
{
    this->hide();
    QMainWindow *newwindow = new QMainWindow();
    newwindow->resize(800, 400);
    newwindow->show();


    // Need to set up and get working correctly
    // Back button
    QPushButton *back_button = new QPushButton(newwindow);
    back_button->setText("Back");
    back_button->setGeometry(QRect(QPoint(10, 80), QSize(200, 50)));
    back_button->show();
    QObject::connect(back_button, &QPushButton::pressed, newwindow, &QMainWindow::hide);
    // Need to go back to previous screen
    this->show();


    // Forward button
    QPushButton *forward_button = new QPushButton(newwindow);
    forward_button->setText("Next");
    forward_button->setGeometry(QRect(QPoint(50, 140), QSize(200, 50)));
    forward_button->show();
    // Create a new screen
    QObject::connect(forward_button, &QPushButton::pressed, this, &QMainWindow::show);
    this->hide();

}

void MainWindow::input_plot()
{
    QMainWindow *windowplot = new QMainWindow();
    windowplot->resize(800, 400);
    windowplot->show();
}

void MainWindow::ButtonClicked()
{

}

Answer 1

您在哪里实际保存自定义小部件的状态？我只看到你保存并加载主窗口本身的位置和大小，而不是它的孩子！？顺便说一句，您可以使用QWidget::saveGeometry()保存基本位置和尺寸，并使用QWidget::restoreGeometry加载工具栏的状态，并将QMainWindow与QMainWindow::saveState的停靠窗口小部件一起加载，并将其加载{分别为{3}}。

如果您想保存自定义标签的位置和图片路径，请使用类似的方法：

QSettings settings("MyCompany", "MyApp");
settings.beginGroup("label1"); // your widget id
settings.setValue("geometry", label1->saveGeometry());
settings.setValue("imagePath", label1->text()); // or wherever you save the image
settings.endGroup();

这至少是关于如何解决问题的简单想法，更多细节需要提供更多信息。

Answer 2

好了，现在我知道我只是试图加载主窗口本身的位置和大小，而不是保存它的孩子的位置。

我仍然坚持使用读/写QSettings代码保存保存自定义标签的位置和图像路径的位置。我想我的写设置代码是正确的，但不是读取设置。

void MainWindow::write_settings()
{
    QSettings settings("reaffer Soft", "reafferApp");

    settings.beginGroup("MainWindow");
    settings.setValue("size", size());
    settings.setValue("pos", pos());
    settings.setValue("label", label->saveGeometry());  // Save label size
    settings.setValue("imagePath" label->size());   // Save the image loaded 
    settings.endGroup();

    qDebug() << "Write Settings";

}

为了将图像导入标签，我使用的是另一个cpp文件。该代码如下所示。

<强> Label.cpp

#include "label.h"


//---------------------------------------
// Deconstructor
//---------------------------------------
Label::~Label()
{

}


void Label::mousePressEvent(QMouseEvent *event)
{
    // Move the coordinates on the main window
    m_nMouseClick_X_Coordinate = event->x();
    m_nMouseClick_Y_Coordinate = event->y();
}

void Label::mouseMoveEvent(QMouseEvent *event)
{
    //-------------------------------------------------------------
    // Allow the user to drag the graphics on the Display
    //-------------------------------------------------------------
    move(event->globalX()-m_nMouseClick_X_Coordinate-m_pParentWidget->geometry().x(),

        event->globalY()-m_nMouseClick_Y_Coordinate-m_pParentWidget->geometry().y());
}

void Label::mouseDoubleClickEvent(QMouseEvent *event)
{
    //--------------------------------
    // Open file dialog
    //--------------------------------
    QFileDialog dialog(this);
    dialog.setNameFilter(tr("Images(*.png, *.dxf, *.jpg"));
    dialog.setViewMode(QFileDialog::Detail);
    QString fileName = QFileDialog::getOpenFileName(this,
        tr("Open Images"),
        "/home",
        tr("Image Files (*.png *.jpg *.bmp)"));

    if (!fileName.isEmpty())
    {
        QImage image(fileName);
        Label::setPixmap(fileName);
        Label::adjustSize();
    }
}

使用QT中存储在QLabel中的导入图像保存GUI的状态

2 个答案: