Qt探索之旅（三）可切换界面

一开始出现了这个错误，折磨了我一天，后来上网查资料，有的说是：注意布局如果网格布局的控件new成垂直布局那就出现下面的情况了https://my.oschina.net/u/1446371/blog/525494；还有的说是需要cmd一下：https://jingyan.baidu.com/article/00a07f38a31d5e82d028dc04.html
我当时采用的第二种方法，按照第二种方法做了之后没有按他说的等一会再运行Qt,而是直接就运行了Qt,结果依旧异常终止，气的我打了两把王者荣耀压压惊，唉，再运行一次竟然成了，接着运行了无数次，都成了！！！

config头文件

#ifndef CONFIG_H
#define CONFIG_H
#include <QtGui>//包含Gui中所有头文件，好处是不用一个个添加头文件，坏处是编译慢
#include "MyPage.h"
/*
#include <QtGui/QWidget>
#include <QListWidget>
#include <QListWidgetItem>//列表框添加项目
#include <QVBoxLayout>
#include <QTextCodec>
#include <QPushButton>
*/


class config : public QWidget
{
    Q_OBJECT

public:
    config(QWidget *parent = 0);
    ~config();
    QListWidget *list;
    MyPage1 *page1;
    MyPage2 *page2;
    MyPage3 *page3;

    QStackedWidget *InfoWidget;
protected slots:
    void pagechanged(int);
};

#endif // CONFIG_H

MyPage.h头文件

#ifndef MYPAGE_H
#define MYPAGE_H

#include <QtGui/QWidget>
#include <QLabel>
#include <QLineEdit>
#include <QGridLayout>

class MyPage1 : public QWidget
{
    Q_OBJECT

public:
    MyPage1(QWidget *parent = 0);
    ~MyPage1(){};
    QLabel *ThemeLabel, *SeasonLabel, *LocateLabel, *VerseLabel;
    QLineEdit *ThemeEdit, *SeasonEdit, *LocateEdit, *VerseEdit;
};

class MyPage2 : public QWidget
{
    Q_OBJECT

public:
    MyPage2(QWidget *parent = 0);
    ~MyPage2(){};
    QLabel *ThemeLabel, *SeasonLabel, *LocateLabel, *VerseLabel;
    QLineEdit *ThemeEdit, *SeasonEdit, *LocateEdit, *VerseEdit;

};

class MyPage3 : public QWidget
{
    Q_OBJECT

public:
    MyPage3(QWidget *parent = 0);
    ~MyPage3(){};
    QLabel *ThemeLabel, *SeasonLabel, *LocateLabel, *VerseLabel;
    QLineEdit *ThemeEdit, *SeasonEdit, *LocateEdit, *VerseEdit;

};

#endif // MYPAGE_H

config.cpp文件

#include "config.h"

config::config(QWidget *parent)
    : QWidget(parent)
{
    list = new QListWidget;
    list->setIconSize(QSize(200, 100));//设置图片尺寸
    list->setSpacing(12);
    list->setViewMode(QListView::IconMode);//从左至右排列，上图下字，上图下字，上图下字
    list->setMaximumWidth(134);//设置最大宽度
    list->setMovement(QListView::Static);//设置图片不可拖动


    QListWidgetItem *item1 = new QListWidgetItem;//定义项目
    item1->setIcon(QIcon(":/xueren.png"));//设置按钮图标
    item1->setText(tr("雪人"));//tr函数：里面的字符串需要国际化

    QListWidgetItem *item2 = new QListWidgetItem;
    item2->setIcon(QIcon(":/zise.jpg"));
    item2->setText(tr("紫色"));

    QListWidgetItem *item3 = new QListWidgetItem;
    item3->setIcon(QIcon(":/fense.png"));
    item3->setText(tr("粉色"));




    list->addItem(item1);
    list->addItem(item2);
    list->addItem(item3);

    QPushButton *btn = new QPushButton(this);
    connect(btn, SIGNAL(clicked()), this, SLOT(close()));
    btn->setText(tr("关闭"));

    InfoWidget = new QStackedWidget;
    page1 = new MyPage1;
    page2 = new MyPage2;
    page3 = new MyPage3;
    InfoWidget->addWidget(page1);
    InfoWidget->addWidget(page2);
    InfoWidget->addWidget(page3);

    connect(list, SIGNAL(currentRowChanged(int)), this, SLOT(pagechanged(int)));

    QHBoxLayout *hlayout = new QHBoxLayout;//横向布局
    hlayout->addWidget(list);
    hlayout->addWidget(InfoWidget);

    QGridLayout *mainlayout = new QGridLayout(this);//纵向布局
    mainlayout->addLayout(hlayout, 0, 0, 1, 6);//0行0列，占用1行6列
    mainlayout->addWidget(btn, 1, 5, 1, 1);//1行5列，占用1行1列


  /*  QVBoxLayout *vlayout = new QVBoxLayout(this);//布局管理器
    vlayout->addWidget(list);
    vlayout->addWidget(btn);
    this->setLayout(vlayout);*/

    this->resize(800, 600);//设置窗口大小
}

config::~config()
{

}

void config::pagechanged(int index)
{
    InfoWidget->setCurrentIndex(index);
}

MyPage.cpp文件

#include "MyPage.h"

MyPage1::MyPage1(QWidget *parent)
    : QWidget(parent)
{
    ThemeLabel = new QLabel(tr("主题："));
    SeasonLabel = new QLabel(tr("地点："));
    LocateLabel = new QLabel(tr("时间："));
    VerseLabel = new QLabel(tr("诗句："));

    ThemeEdit = new QLineEdit(tr("白雪纷飞"));
    SeasonEdit = new QLineEdit(tr("冬天"));
    LocateEdit = new QLineEdit(tr("北国"));
    VerseEdit = new QLineEdit(tr("梅须逊雪三分白， 雪却输梅一段香"));

    QGridLayout *Glayout = new QGridLayout(this);
    Glayout->addWidget(ThemeLabel, 0, 0, 1, 2);//行宽为1,列宽为2
    Glayout->addWidget(ThemeEdit, 0, 2, 1, 2);
    Glayout->addWidget(SeasonLabel, 1, 0, 1, 2);
    Glayout->addWidget(SeasonEdit, 1, 2, 1, 2);
    Glayout->addWidget(LocateLabel, 2, 0, 1, 2);
    Glayout->addWidget(LocateEdit, 2, 2, 1, 2);

    this->setLayout(Glayout);

}

MyPage2::MyPage2(QWidget *parent)
    : QWidget(parent)
{
    ThemeLabel = new QLabel(tr("主题："));
    SeasonLabel = new QLabel(tr("地点："));
    LocateLabel = new QLabel(tr("时间："));
    VerseLabel = new QLabel(tr("诗句："));

    ThemeEdit = new QLineEdit(tr("紫气东来"));
    SeasonEdit = new QLineEdit(tr("夏天"));
    LocateEdit = new QLineEdit(tr("*"));
    VerseEdit = new QLineEdit(tr(" 草木知春不久归，百般红紫斗芳菲"));

    QGridLayout *Glayout = new QGridLayout(this);
    Glayout->addWidget(ThemeLabel, 0, 0, 1, 2);//行宽为1,列宽为2
    Glayout->addWidget(ThemeEdit, 0, 2, 1, 2);
    Glayout->addWidget(SeasonLabel, 1, 0, 1, 2);
    Glayout->addWidget(SeasonEdit, 1, 2, 1, 2);
    Glayout->addWidget(LocateLabel, 2, 0, 1, 2);
    Glayout->addWidget(LocateEdit, 2, 2, 1, 2);

    this->setLayout(Glayout);
}

MyPage3::MyPage3(QWidget *parent)
    : QWidget(parent)
{
    ThemeLabel = new QLabel(tr("主题："));
    SeasonLabel = new QLabel(tr("地点："));
    LocateLabel = new QLabel(tr("时间："));
    VerseLabel = new QLabel(tr("诗句："));

    ThemeEdit = new QLineEdit(tr("红粉青楼"));
    SeasonEdit = new QLineEdit(tr("春天"));
    LocateEdit = new QLineEdit(tr("九州"));
    VerseEdit = new QLineEdit(tr(" 青青河畔草，郁郁园中柳"));

    QGridLayout *Glayout = new QGridLayout(this);
    Glayout->addWidget(ThemeLabel, 0, 0, 1, 2);//行宽为1,列宽为2
    Glayout->addWidget(ThemeEdit, 0, 2, 1, 2);
    Glayout->addWidget(SeasonLabel, 1, 0, 1, 2);
    Glayout->addWidget(SeasonEdit, 1, 2, 1, 2);
    Glayout->addWidget(LocateLabel, 2, 0, 1, 2);
    Glayout->addWidget(LocateEdit, 2, 2, 1, 2);

    this->setLayout(Glayout);
}

main.cpp文件

#include <QtGui/QApplication>
#include "config.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTextCodec::setCodecForTr(QTextCodec::codecForLocale());
    config w;
    w.show();

    return a.exec();
}