Qt中QLayout的用法（QGridLayout, QFormLayout, QStackedLayout）

Qt的布局类继承关系

在此仅简单介绍3种不常用的layout

QStackedLayout, QFormLayout , QGridLayout

实现代码

myLayouts.h

#pragma once

#include <QtWidgets/QWidget>
#include "ui_myLayouts.h"

class myLayouts : public QWidget
{
    Q_OBJECT

public:
    myLayouts(QWidget *parent = Q_NULLPTR);

private:
    Ui::myLayoutsClass ui;

    void initMyStackedLayout();
    void initMyFormLayout();
    void initMyGridLayout();

};

myLayouts.cpp

#include "myLayouts.h"
#include <QStackedLayout>
#include <QFormLayout>
#include <QBoxLayout>
#include <QGridLayout>

#include <QLabel>
#include <qlineedit.h>
#include <qspinbox.h>

myLayouts::myLayouts(QWidget *parent)
    : QWidget(parent)
{
    ui.setupUi(this);
    initMyStackedLayout();
    initMyFormLayout();
    initMyGridLayout();
}
void myLayouts::initMyStackedLayout()
{
    QWidget* wgt1, * wgt2, * wgt3;
    wgt1 = new QWidget();
    wgt2 = new QWidget();
    wgt3 = new QWidget();
    wgt1->setStyleSheet("background:rgb(128,0,0)");
    wgt2->setStyleSheet("background:rgb(0,128,0)");
    wgt3->setStyleSheet("background:rgb(0,0,128)");

    QLabel* lb1, * lb2, * lb3;
    lb1 = new QLabel("Label1", wgt1);
    lb2 = new QLabel("Label2", wgt2);
    lb3 = new QLabel("Label3", wgt3);

    lb1->setStyleSheet("background:rgb(220,220,220)");
    lb2->setStyleSheet("background:rgb(170,170,170)");
    lb3->setStyleSheet("background:rgb(100,100,100)");

    QStackedLayout* slay = new QStackedLayout(ui.widget);
    slay->addWidget(wgt1);
    slay->addWidget(wgt2);
    slay->addWidget(wgt3);
    slay->setStackingMode(QStackedLayout::StackAll);
    QHBoxLayout* hlay = new QHBoxLayout;
    hlay->addLayout(slay);
    ui.widget->setLayout(hlay);

    ui.comboBox->addItem(tr("page1"));
    ui.comboBox->addItem(tr("page2"));
    ui.comboBox->addItem(tr("page3"));

    connect(ui.comboBox, SIGNAL(activated(int)), slay, SLOT(setCurrentIndex(int)));
}
void myLayouts::initMyFormLayout()
{
    QLineEdit* nameLineEdit1, * emailLineEdit1,*addrLineEdit1;
    nameLineEdit1 = new QLineEdit;
    emailLineEdit1 = new QLineEdit;
    addrLineEdit1 = new QLineEdit;

    QSpinBox* ageSpinBox1 = new QSpinBox;

    QFormLayout* formLayout = new QFormLayout;
    formLayout->addRow(tr("&Name1:"), nameLineEdit1);
    formLayout->addRow(tr("&Email1:"), emailLineEdit1);
    formLayout->addRow(tr("&Age1:"), ageSpinBox1);
    formLayout->addRow(tr("&Addr1:"), addrLineEdit1);

    ui.widget2->setLayout(formLayout);
}
void myLayouts::initMyGridLayout()
{

    QLineEdit* nameLineEdit, * emailLineEdit, * addrLineEdit;
    nameLineEdit = new QLineEdit;
    emailLineEdit = new QLineEdit;
    addrLineEdit = new QLineEdit;

    QSpinBox* ageSpinBox = new QSpinBox;

    QLabel* nameLabel, * emailLabel, * ageLabel, * addrLabel;

    nameLabel = new QLabel(tr("&Name:"));
    nameLabel->setBuddy(nameLineEdit);

    emailLabel = new QLabel(tr("&Email:"));
    emailLabel->setBuddy(emailLineEdit);

    ageLabel = new QLabel(tr("&Age:"));
    ageLabel->setBuddy(ageSpinBox);

    addrLabel = new QLabel(tr("&Addr:"));
    addrLabel->setBuddy(addrLineEdit);

    QGridLayout* gridLayout = new QGridLayout;
    gridLayout->addWidget(nameLabel, 0, 0);
    gridLayout->addWidget(nameLineEdit, 0, 1);
    gridLayout->addWidget(emailLabel, 1, 0);
    gridLayout->addWidget(emailLineEdit, 1, 1);
    gridLayout->addWidget(ageLabel, 2, 0);
    gridLayout->addWidget(ageSpinBox, 2, 1);
    gridLayout->addWidget(addrLabel, 3, 0);
    gridLayout->addWidget(addrLineEdit, 3, 1);
    ui.widget3->setLayout(gridLayout);
}