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QT 实现各种对话框

记录一个初学小白的学习过程，记录一些浅显的学习笔记

目录

文件对话框

颜色对话框

字体对话框

输入对话框

消息对话框

文件对话框

点击选择按钮选择一个文件，点击获取文件大小来显示文件大小的信息

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QHBoxLayout>  //水平布局
#include <QVBoxLayout>  //垂直布局


#include <QFileDialog>  //文件对话框

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();
private:
    QLabel *FileNameLabel;
    QLineEdit *FileNameLabelEdit;

    QPushButton *FileButton;

    QLabel *FileSizeLabel;
    QLineEdit *FileSizeLabelEdit;

    QPushButton*GetFileInfoButton;

private slots:
    void GetFileInfo(); //用于打开文件
    void GetFileSize();  //获取文件大小

};
#endif // DIALOG_H

#include "dialog.h"
#include <QIcon>

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    setWindowTitle("Qfiledialoh类文件对话框测试");
    QIcon icon("E:\\123.jpg");
    setWindowIcon(icon);

    //1：创建控件
    FileNameLabel =new QLabel("文件名称：");
    FileNameLabelEdit=new QLineEdit;
    FileButton =new QPushButton("选择...");

    FileSizeLabel =new QLabel("文件大小");
    FileSizeLabelEdit=new QLineEdit;

    GetFileInfoButton=new QPushButton("获取文件大小信息");

    //2：排列布局
    QGridLayout *glayout=new QGridLayout;  //网格布局 理解：安排部件在网格中的具体位置
    glayout->addWidget(FileNameLabel,0,0);
    glayout->addWidget(FileNameLabelEdit,0,1);
    glayout->addWidget(FileButton,0,2);

    glayout->addWidget(FileSizeLabel,1,0);
    glayout->addWidget(FileSizeLabelEdit,1,1,1,2);
    //当使用四个参数时（包括列间距和行间距），你可以指定小部件跨越的位格
    //当只使用两个参数时（不包括列span和行span），小部件只占据指定的位格，不会跨越

    QHBoxLayout *hlayout=new QHBoxLayout;
    hlayout->addWidget(GetFileInfoButton);

    QVBoxLayout *vlayout =new QVBoxLayout(this);  //垂直布局 理解：安排网格布局里的展示方式
    vlayout->addLayout(glayout);
    vlayout->addLayout(hlayout);
    //理解：为什么QGridLayout在之前计算体积的时候可以单独显示，但是现在却需要QVBoxLayout来帮助显示
    //因为之前的QGridLayout在创建对象的最后有 “this”，是基于本窗口类的，而现在这个没有基于本窗口，
    //但是QVBoxLayout是有“this”的，它基于本窗口所以会显示


    connect(FileButton,SIGNAL(clicked()),this,SLOT(GetFileInfo()));
    connect(GetFileInfoButton,SIGNAL(clicked()),this,SLOT(GetFileSize()));
}

Dialog::~Dialog()
{
}

void Dialog::GetFileInfo() //用于打开文件
{
    QString strFileName = QFileDialog::getOpenFileName(this,"打开","/","Files(*)");
    FileNameLabelEdit->setText(strFileName);
}
void Dialog::GetFileSize()  //获取文件大小
{
    //获取单行编辑框控件里面的文件路径等
    QString strFileNames=FileNameLabelEdit->text();
    QFileInfo fileinfo(strFileNames);

    qint64 FileSize=fileinfo.size();
    FileSizeLabelEdit->setText(QString::number(FileSize));

}

颜色对话框

点击选择颜色按钮打开调色板，选择颜色并在对话框处显示出来

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QPushButton>
#include <QFrame>  //QFrame是基本控件的基类
#include <QColorDialog>
#include <QGridLayout>

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();

private:
    QGridLayout *glayout;
    QPushButton *colorbutton;
    QFrame *colorframe;
private slots:
    void displaycolor();
};
#endif // DIALOG_H
#include "dialog.h"

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    setGeometry(200,500,1200,1000);

    glayout = new QGridLayout(this);
    colorbutton =new QPushButton("点击选择颜色");
    colorframe= new QFrame;

    colorframe->setFrameShape(QFrame::Box);  //设置形状
    colorframe->setAutoFillBackground(true);  //设置填充背景

    glayout->addWidget(colorbutton,0,0);
    glayout->addWidget(colorframe,1,0);

    connect(colorbutton,SIGNAL(clicked()),this,SLOT(displaycolor()));
}
Dialog::~Dialog()
{
}
void Dialog::displaycolor()
{
    QColor colorvalues=QColorDialog::getColor(Qt::blue);  //设置调色板的默认值

    if(colorvalues.isValid())
    {
        colorframe->setPalette(QPalette(colorvalues));  //palette 调色板
    }
}

字体对话框

编辑框内可以输入字符，可以选择字体

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

#include <QPushButton>
#include <QLineEdit>
#include <QFontDialog>
#include <QGridLayout>

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();

private:
    QPushButton *fontbutton;
    QGridLayout *layout;
    QLineEdit *lineedit;
private slots:
    void displayfunc();
};
#endif // DIALOG_H

#include "dialog.h"

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    layout=new QGridLayout(this);

    fontbutton=new QPushButton("选择字体");
    lineedit=new QLineEdit;
    lineedit->setText("你好呀");

    layout->addWidget(fontbutton,0,0);
    layout->addWidget(lineedit,0,1);

    connect(fontbutton,SIGNAL(clicked()),this,SLOT(displayfunc()));
}

Dialog::~Dialog()
{
}

void Dialog::displayfunc()
{
    bool isbool;

    QFont font =QFontDialog::getFont(&isbool);
    if(isbool){
        lineedit->setFont(font);
    }
}

输入对话框

实现学号、姓名、性别、分数的输入展示

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

#include <QPushButton>
#include <QLineEdit>
#include <QGridLayout>

#include <QInputDialog>

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();

private:
    QGridLayout *layout;

    QPushButton *inputstudentnobutton;
    QLineEdit *inputstudentnolineedit;

    QPushButton *inputstudentnamebutton;
    QLineEdit *inputstudentnamelineedit;

    QPushButton *inputstudentsexbutton;
    QLineEdit *inputstudentsexlineedit;

    QPushButton *inputstudentscorebutton;
    QLineEdit *inputstudentscorelineedit;

private slots:
    void modifynofunc();
    void modifysexfunc();

};
#endif // DIALOG_H

#include "dialog.h"

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    resize(600,500);

    layout=new QGridLayout(this);

    inputstudentnobutton =new QPushButton("学号");
    inputstudentnolineedit =new QLineEdit();
    inputstudentnolineedit->setText("20222001");

    inputstudentnamebutton =new QPushButton("姓名");
    inputstudentnamelineedit =new QLineEdit();
    inputstudentnamelineedit->setText("李华");

    inputstudentsexbutton =new QPushButton("性别");
    inputstudentsexlineedit =new QLineEdit();
    inputstudentsexlineedit->setText("男");

    inputstudentscorebutton =new QPushButton("分数");
    inputstudentscorelineedit =new QLineEdit();
    inputstudentscorelineedit->setText("150");

    layout->addWidget(inputstudentnobutton,0,0);
    layout->addWidget(inputstudentnolineedit,0,1);
    layout->addWidget(inputstudentnamebutton,1,0);
    layout->addWidget(inputstudentnamelineedit,1,1);
    layout->addWidget(inputstudentsexbutton,2,0);
    layout->addWidget(inputstudentsexlineedit,2,1);
    layout->addWidget(inputstudentscorebutton,3,0);
    layout->addWidget(inputstudentscorelineedit,3,1);

    connect(inputstudentnobutton,SIGNAL(clicked()),this,SLOT(modifynofunc()));
    connect(inputstudentsexbutton,SIGNAL(clicked()),this,SLOT(modifysexfunc()));
}

Dialog::~Dialog()
{
}

void Dialog::modifynofunc()
{
    bool isbool;
    QString strText=QInputDialog::getText(this,"标准输入对话框","请输入学号：",
                QLineEdit::Normal,inputstudentnolineedit->text(),&isbool);

    if(isbool && !strText.isEmpty())
    {
        inputstudentnolineedit->setText(strText);
    }

}
void Dialog::modifysexfunc()
{
    QStringList strSexItems;
    strSexItems<<"男"<<"女";

    bool isbool;
    QString strsexItem=QInputDialog::getItem(this,"标准输入对话框","请选择性别",
                                             strSexItems,0,false,&isbool);
    if(isbool && !strsexItem.isEmpty()){
        inputstudentsexlineedit->setText(strsexItem);
    }
}

消息对话框

实现各种消息的对话框提示

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

#include <QLabel>
#include <QPushButton>
#include <QGridLayout>
#include <QMessageBox>

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();
private:
    QGridLayout *layout;
    QLabel *displabel;
    QPushButton *questionbutton;  //问题消息框命令按钮
    QPushButton *informationbutton;  //信息消息框命令按钮
    QPushButton *waringbutton;  //警告消息框命令按钮
    QPushButton *criticalbutton;  //错误消息框命令按钮
    QPushButton *aboutbutton;  //关于消息框命令按钮
    QPushButton *aboutqtbutton;

private slots:
    void displayquestionMsg();
    void displayinformationMsg();
    void displaywarningMsg();
    void displaycriticalMsg();
    void displayaboutMsg();
    void displayaboutqtMsg();
};
#endif // DIALOG_H

 

#include "dialog.h"

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    layout=new QGridLayout(this);
    displabel=new QLabel("请你选择一个消息框");
    questionbutton=new QPushButton("QuestionMsg");  //问题消息框命令按钮
    informationbutton=new QPushButton("informationMsg");  //信息消息框命令按钮
    waringbutton=new QPushButton("warningMsg");  //警告消息框命令按钮
    criticalbutton=new QPushButton("criticalMsg'"); //错误消息框命令按钮
    aboutbutton=new QPushButton("aboutMsg"); //关于消息框命令按钮
    aboutqtbutton=new QPushButton("aboutQtMsg");
    layout->addWidget(displabel,0,0,1,2);
    layout->addWidget(questionbutton,1,0);
    layout->addWidget(informationbutton,1,1);
    layout->addWidget(waringbutton,2,0);
    layout->addWidget(criticalbutton,2,1);
    layout->addWidget(aboutbutton,3,0);
    layout->addWidget(aboutqtbutton,3,1);

    connect(questionbutton,SIGNAL(clicked()),this,SLOT(displayquestionMsg()));
    connect(informationbutton,SIGNAL(clicked()),this,SLOT(displayinformationMsg()));
    connect(waringbutton,SIGNAL(clicked()),this,SLOT(displaywarningMsg()));
    connect(criticalbutton,SIGNAL(clicked()),this,SLOT(displaycriticalMsg()));
    connect(aboutbutton,SIGNAL(clicked()),this,SLOT(displayaboutMsg()));
    connect(aboutqtbutton,SIGNAL(clicked()),this,SLOT(displayaboutqtMsg()));
}

Dialog::~Dialog()
{
}

void Dialog::displayquestionMsg()
{
    displabel->setText("Question Message Box");

    switch (QMessageBox::question(this,"Question消息框","你是否想退出应用程序，请选择？"
        ,QMessageBox::Ok|QMessageBox::Cancel,QMessageBox::Ok))
    {
    case QMessageBox::Ok:
        displabel->setText("你选择的QuestionMsg命令按钮当中的button/Ok");
        break;
    case QMessageBox::Cancel:
        displabel->setText("你选择的QuestionMsg命令按钮中的button/Cancel");
        break;
    default:
        break;
    }
}
void Dialog::displayinformationMsg()
{
    displabel->setText("information QMessageBox");
    QMessageBox::information(this,"Information消息框","Information消息框测试成功");
    return ;
}
void Dialog::displaywarningMsg()
{
    displabel->setText("Waring Message Box");

    switch (QMessageBox::warning(this,"Waring消息框","是否删除数据",
         QMessageBox::Save|QMessageBox::Discard|QMessageBox::Cancel,QMessageBox::Save))
    {
    case QMessageBox::Save:
        displabel->setText("你选择的WaringMsg命令按钮当中的button/Save");
        break;
    case QMessageBox::Discard:
        displabel->setText("你选择的WaringMsg命令按钮中的button/Discard");
        break;
    case QMessageBox::Cancel:
        displabel->setText("你选择的WaringMsg命令按钮中的button/Cancel");
        break;
    default:
        break;
    }
}
void Dialog::displaycriticalMsg()
{
    displabel->setText("critical QMessageBox");
    QMessageBox::critical(this,"critical消息框","数据库文件备份错误，请重新检查？");
    return ;
}
void Dialog::displayaboutMsg()
{
    displabel->setText("about QMessageBox");
    QMessageBox::about(this,"about消息框","测试Qt about消息");
    return ;
}
void Dialog::displayaboutqtMsg()
{
    displabel->setText("about Qt QMessageBox");
    QMessageBox::aboutQt(this,"about消息框 测试Qt aboutQt消息");
    return ;
}

 gg，推荐课程：https://xxetb.xetslk.com/s/kNPSd

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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