c++ - 如果 child 调整大小，让 QWidget 和 QVBoxLayout 自动调整大小(Qt4)

Question

我给出了以下最小示例代码。

ma​​in.cpp:

#include <QApplication>
#include "qt.h"

int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    MyDialog mainWin;
    mainWin.show();
    return app.exec();
}

qt.cpp:

#include <QLabel>
#include "qt.h"

void MyDialog::setupUi()
{
    setCentralWidget(new QWidget);
    mainLayout = new QVBoxLayout( centralWidget() );
    centralWidget()->setLayout(mainLayout);

    // show the add new effect channel button
    QPushButton* newKnobBtn = new QPushButton("new", this );
    connect( newKnobBtn, SIGNAL(clicked()), this, SLOT(addNewKnob()));
    mainLayout->addWidget( newKnobBtn, 0, Qt::AlignRight );

    containerWidget = new QWidget(this);
    scrollArea = new QScrollArea(containerWidget);
    mainLayout->addWidget(containerWidget);

    scrollLayout = new QVBoxLayout(scrollArea);
    scrollArea->setLayout(scrollLayout);

    /*
    QSizePolicy pol;
    pol.setVerticalPolicy(QSizePolicy::Expanding);
    setSizePolicy(pol);
    */

    addNewKnob(); // to fit size initially
}

void MyDialog::addNewKnob()
{
    scrollLayout->addWidget(new QLabel("Hello World", this));
    /*
    containerWidget->adjustSize();
    adjustSize();
    */
}

qt.h:

#include <QMainWindow>
#include <QVBoxLayout>
#include <QScrollArea>
#include <QPushButton>

class MyDialog : public QMainWindow
{
    Q_OBJECT
private slots:
    void addNewKnob();
private:
    void setupUi();
    QVBoxLayout* mainLayout;
    QScrollArea* scrollArea;
    QVBoxLayout* scrollLayout;
    QWidget* containerWidget;
public:
    MyDialog( ) { setupUi(); }
};

编译:全部放在一个目录下，输入

qmake -project && qmake && make

我从这里得到了 adjustSize() 解决方案，但它不起作用:(link) .我注释掉的所有内容都是我尝试但没有帮助的内容。

当向 scrollLayout 添加新标签时，如何使 containerWidget 和 scrollLayout 正确增长？

Answer 1

这是一个适合我的简化版本:

qt.cpp:

#include <QLabel>
#include <QPushButton>
#include <QScrollArea>
#include "qt.h"

MyDialog::MyDialog()
{
    QWidget * mainWidget = new QWidget;
    QBoxLayout * mainLayout = new QVBoxLayout(mainWidget);
    setCentralWidget(mainWidget);

    // show the add new effect channel button
    QPushButton* newKnobBtn = new QPushButton("new");
    connect( newKnobBtn, SIGNAL(clicked()), this, SLOT(addNewKnob()));
    mainLayout->addWidget( newKnobBtn, 0, Qt::AlignRight );

    QScrollArea * scrollArea = new QScrollArea;
    scrollArea->setWidgetResizable(true);
    mainLayout->addWidget(scrollArea);

    QWidget * labelsWidget = new QWidget;
    labelsLayout = new QVBoxLayout(labelsWidget);
    scrollArea->setWidget(labelsWidget);

    addNewKnob(); // to fit size initially
}

void MyDialog::addNewKnob()
{
    labelsLayout->addWidget(new QLabel("Hello World"));
}

qt.h:

#include <QMainWindow>
#include <QBoxLayout>

class MyDialog : public QMainWindow
{
    Q_OBJECT

public:
    MyDialog( );

private slots:
    void addNewKnob();

private:
    QBoxLayout * labelsLayout;
};