QT learning 24 layout manager (III)

Qt Study 24 Layout manager （ 3、 ... and ）

reflection

How to design the following graphical user interface ？

Solution

• Absolute positioning Coordinates and size of the assembly
• nesting QBoxLayout
• establish 3*2 Of QGridLayout

The above three methods are more or less problematic , Absolute positioning Coordinates need to be calculated , nesting QBoxyLayout Need to use 4 A layout manager , and 3*2 Of QGridLayout When the window size changes , It will cause the problem of fixed proportion coefficient .

QFormLayout Layout manager

• With Forms （Form） Manage interface components in a way

• Form layout The tags and components in are Corresponding to each other The relationship between

• QFormLayout Usage Summary of

  • void addRow(QWidget *label, QWidget *field)
  • void addRow(QWidget *label, QLayout *field)
  • void addRow(const QString& labelText, QWidget *field)
  • void addRow(const QString& labelText, QLayout *field)

• Form layout Support nested , Other layout managers can be managed as sub layouts

Programming experiment

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

class Widget : public QWidget
{
    
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
};

#endif // WIDGET_H

#include "Widget.h"
#include <QLineEdit>
#include <QFormLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    
    QLineEdit *nameEdit = new QLineEdit();
    QLineEdit *mailEdit = new QLineEdit();
    QLineEdit *addrEdit = new QLineEdit();
    QFormLayout *layout = new QFormLayout();

    layout->addRow("Name:", nameEdit);
    layout->addRow("Email:", mailEdit);
    layout->addRow("Address:", addrEdit);
    // layout->setRowWrapPolicy(QFormLayout::WrapAllRows);
    layout->setRowWrapPolicy(QFormLayout::WrapLongRows);    //  Adaptive labels and edit boxes 
    layout->setSpacing(10);
    setLayout(layout);
    setWindowTitle("FTP");
}

Widget::~Widget()
{
    

}

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

int main(int argc, char *argv[])
{
    
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

• QFormLayout Style function of

  • void setRowWrapPolicy(RowWrapPolicy policy)
  • void setLabelAlignment(Qt::Alignment alignment)

• Nesting of layout managers

Summary

• QFormLayout With Forms Manage interface components in a way
• QFormLayout Of style Set up concise clear
• QFormLayout Support the nesting of layout managers
• QFormLayout Embedded products The most commonly used layout