如何将 QFormLayout 放入 scrollArea 中？

Question

我的程序有一个主程序 window，它创建一个名为 wdg 的小部件。这个小部件有一个 QFormLayout 有 193 行。我希望能够向下滚动 QFormLayout。我尝试制作 QScrollArea 并将其与布局和小部件集成，但它导致小部件不显示或滚动条不显示。我认为这与新 window 的高度似乎与整个布局一样长并超出屏幕这一事实有关。我尝试将小部件的几何形状设置为有限大小，但它只是改变了位置而不是大小。结果小部件未显示：

QWidget *wdg = new QWidget;
QScrollArea *scroll = new QScrollArea;
QFormLayout *formLayout = new QFormLayout(wdg);
int lenght = keys.size();
        for(int x=0; x<=lenght-1; x++)
{

            QComboBox* combo = new QComboBox;
            combo->addItem("Present");
            combo->addItem("Present and Voting");
            combo->addItem("Absent");
            combo->addItem("Absent from Commitee");
            combo->setProperty("MyIndex", x);
            combo->setCurrentIndex(status[x]);
 formLayout->addRow(keys.at(x),combo);
connect(combo, SIGNAL(currentIndexChanged(int)), this, SLOT(roll(int)));

}
scroll->setWidget(wdg);
 wdg->setLayout(formLayout);

wdg->show();

显示小部件但没有滚动条或布局的结果：

QWidget *wdg = new QWidget;
QScrollArea *scroll = new QScrollArea(wdg);
QFormLayout *formLayout = new QFormLayout();
int lenght = keys.size();
        for(int x=0; x<=lenght-1; x++)
{

            QComboBox* combo = new QComboBox;
            combo->addItem("Present");
            combo->addItem("Present and Voting");
            combo->addItem("Absent");
            combo->addItem("Absent from Commitee");
            combo->setProperty("MyIndex", x);
            combo->setCurrentIndex(status[x]);
 formLayout->addRow(keys.at(x),combo);
 connect(combo, SIGNAL(currentIndexChanged(int)), this, SLOT(roll(int)));

}
scroll->setLayout(formLayout);


wdg->show();

Answer 1

您必须创建一个包含 QFormLayout 的小部件，然后将该小部件设置为 QScrollArea，并且 QScrollArea 您必须在小部件 [=14= 中设置它] 通过另一个布局：

QWidget *wdg = new QWidget;
QScrollArea *scroll = new QScrollArea;

QWidget *content_widget = new QWidget;

QFormLayout *formLayout = new QFormLayout(content_widget);

QStringList items{"Present", "Present and Voting", "Absent", "Absent from Commitee"};

for(int x=0; x < keys.size(); x++)
{

    QComboBox *combo = new QComboBox;
    combo->addItems(items);
    combo->setProperty("MyIndex", x);
    combo->setCurrentIndex(status[x]);
    formLayout->addRow(keys.at(x),combo);
    connect(combo, SIGNAL(currentIndexChanged(int)), this, SLOT(roll(int)));
}

scroll->setWidget(content_widget);
wdg->setLayout(new QVBoxLayout);
wdg->layout()->addWidget(scroll);
wdg->show();

输出：

下面link有个例子

如何将 QFormLayout 放入 scrollArea 中？

How can I put a QFormLayout in a scrollArea?

c++

qt

qt5

qscrollarea

qformlayout