0. QT 패키지 고려 사항

1. 신호와 슬롯

/*         ：
1.            ，  Qt     signals   public,private, protected。
2.           ，       void。
3.           。
4.          QOBject ，          Q_OBJECT。
5.        ，         ，          ，         ，            ，                       ，                      。
6.        ，         ：      ，           ，           。
7.      emit   。
8.                 。
*/

/*        ：
1.        C++  ，             。            ，        。
2.       ：public/protected/private slots:
3.   Qt4   ， Qt5            ，              ，       Lambda       。          ，             .
*/
connect(pushButton, SIGNAL(clicked()), dialog,  SLOT(close()));
connect(pushButton, QPushButton::clicked, dialog,  QDialog::close);

#include "widget.h"
#include 
#include 
#include

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{       
    vLayout = new QVBoxLayout(this);
    b1=new QPushButton("     ",this);
    b2=new QPushButton("      ",this);
    b3=new QPushButton("      ",this);
    vLayout->addWidget(b1);
    vLayout->addWidget(b2);
    vLayout->addWidget(b3);
    connect(b1,&QPushButton::clicked,[=](){this->close();});
}

Widget::~Widget()
{}

//   
#ifndef WIDGET_H
#define WIDGET_H

#include 
#include

class Widget : public QWidget
{
    Q_OBJECT
    public:
    Widget(QWidget *parent = 0);
    ~Widget();
    private:
    QPushButton *b1;
    private slots:
    void on_button1_released();
};

#endif // WIDGET_H

//   
#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    resize(500,300);
    b1=new QPushButton("CLOSE",this);
    b1->move(200,200);
    b1->setObjectName(QStringLiteral("button1"));
    QMetaObject::connectSlotsByName(this);
}

Widget::~Widget()
{}

void Widget::on_button1_released()
{
    this->close();
}

//  
b1->setObjectName(QStringLiteral("button1"));       //       
QMetaObject::connectSlotsByName(this);              //     
void Widget::on_button1_released()；                //        ，     

#include "widget.h"

#include 
#include 
#include 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{   
    //      ，          
    QVBoxLayout* vLayout = new QVBoxLayout(this);

    //     ，           ，         
    QLineEdit* edit = new QLineEdit;
    edit->setAlignment(Qt::AlignRight);
    vLayout->addWidget(edit);//            

    //       
    QSignalMapper* signalMapper = new QSignalMapper(this);

    //  0-9   ，          
    QGridLayout *gridLayout = new QGridLayout;
    for (int i = 0; i < 10; ++i)
    {
        QString txt = QString::number(i);
        QPushButton *button = new QPushButton(txt);
        connect(button, SIGNAL(clicked()), signalMapper, SLOT(map()));
        signalMapper->setMapping(button, txt);//             
        gridLayout->addWidget(button, i / 3, i % 3);//    3 
    }

    //            
    connect(signalMapper, SIGNAL(mapped(QString)),
            edit, SLOT(setText(QString)));

    vLayout->addLayout(gridLayout);
    resize(200, 200);
}
Widget::~Widget()
{}

//  :    
connect(button, SIGNAL(clicked()), signalMapper, SLOT(map()));
signalMapper->setMapping(button, txt);//             
connect(signalMapper, SIGNAL(mapped(QString)),edit, SLOT(setText(QString)));

2. 모드 대화 상자 및 비모드 대화 상자

#include "widget.h"
#include 
#include 
#include
#include
#include "customdialog.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{       
    vLayout = new QVBoxLayout(this);
    b1=new QPushButton("     ",this);
    b2=new QPushButton("      ",this);
    b3=new QPushButton("      ",this);
    vLayout->addWidget(b1);
    vLayout->addWidget(b2);
    vLayout->addWidget(b3);
    connect(b1,&QPushButton::clicked,[=](){
        //       
        QDialog* dlg = new QDialog(this);
        dlg->setAttribute(Qt::WA_DeleteOnClose);//        ，    
        dlg->setWindowModality(Qt::WindowModal);//      setModel(true)
        dlg->show();
    });
    connect(b2,&QPushButton::clicked,[=](){
        //        
        QDialog *modellessDig=new QDialog;
        modellessDig->setWindowTitle("      ");
        modellessDig->setAttribute(Qt::WA_DeleteOnClose);
        modellessDig->show();
    });
    connect(b3,&QPushButton::clicked,[=](){
        //        
        CustomDialog *dlg=new CustomDialog(this);
        dlg->setAttribute(Qt::WA_DeleteOnClose);
        int ret = dlg->exec();
        if (ret == QDialog::Accepted)
        {
            qDebug()<

3. 표준 대화상자

//     
int i = QInputDialog::getInt(this, tr("  "),tr("    "), 25, 16, 100, 1, &ok);
double d = QInputDialog::getDouble(this, tr("  "),tr("      "), 1000, 100, 10000, 1, &ok);

QStringList items;
items << tr("    ") << tr("Dota") << tr("Dota2") << tr("LOL");
bool ok;
QString item = QInputDialog::getItem(this, tr("  "),tr("     "), items, 0, false, &ok);

QString text = QInputDialog::getText(this, tr("  "),tr("    "), QLineEdit::Normal,tr(" "), &ok);

QString text = QInputDialog::getMultiLineText(this, tr("  "),tr("      "), "   ", &ok);

//     
QColor color = QColorDialog::getColor(Qt::green, this, "    ", QColorDialog::DontUseNativeDialog);

//     
QFont font =QFontDialog::getFont(&ok,this);

//      ：
QString directory = QFileDialog::getExistingDirectory(this,"Get directory:","./");

//     
QString fileName = QFileDialog::getOpenFileName(this,"Open a file","./","All Files (*);;Text Files (*.txt)");

//         
QStringList files = QFileDialog::getOpenFileNames(this,"Open multiple files:","./","All Files (*);;Text Files (*.txt)");

//       
QString fileName = QFileDialog::getSaveFileName(this,tr("Save file:"),"./",tr("All Files (*);;Text Files (*.txt)"));

//     
qDebug()<<:critical qdebug="" you="" no="" or="" that="" qmessagebox::no="" qmessagebox::cancel=""/>

4. 템플릿 클래스 및 도구 클래스

QString
QList
QLinkedList
QVector
QMap
QHash
QVariable

     

5. 창 배치

(1) QSplitter

//  
QSplitter *splitterMain = new QSplitter(Qt::Horizontal, Q_NULLPTR);
QTextEdit *textLeft = new QTextEdit(QObject::tr("Left Widget"),splitterMain);
QTextEdit *textRight = new QTextEdit(QObject::tr("Right Widget"), splitterMain);    
QTextEdit *textRight2 = new QTextEdit(QObject::tr("Right Widget2"), splitterMain);  
splitterMain->setStretchFactor(1, 1);
splitterMain->setWindowTitle(QObject::tr("Splitter"));
splitterMain->show();

//  QSplitter      QWidget
//setStretchFactor(int index,int factor)     ：                
//                    
splitterMain->setStretchFactor(0, 1);
splitterMain->setStretchFactor(1, 3);
splitterMain->setStretchFactor(2, 3);
//factor     ，    0         ，   0

(2) QDockWidget

setWindowTitle("  ");
QTextEdit *te = new QTextEdit(this);
te->setText("Main Window");
te->setAlignment(Qt::AlignCenter);
setCentralWidget(te);

QDockWidget *dock1 = new QDockWidget("    1", this);
dock1->setFeatures(QDockWidget::DockWidgetMovable);
dock1->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
QTextEdit *te1 = new QTextEdit();
te1->setText("dock1, which can be moded to left or right side");
dock1->setWidget(te1);
addDockWidget(Qt::RightDockWidgetArea, dock1);

QDockWidget *dock2 = new QDockWidget("    2", this);
dock2->setFeatures(QDockWidget::DockWidgetClosable | QDockWidget::DockWidgetFloatable);
QTextEdit *te2 = new QTextEdit();
te2->setText("dock2, which can be closed and floated");
dock2->setWidget(te2);
addDockWidget(Qt::RightDockWidgetArea, dock2);

QDockWidget *dock3 = new QDockWidget("    3", this);
dock3->setFeatures(QDockWidget::AllDockWidgetFeatures);
QTextEdit *te3 = new QTextEdit();
te3->setText("dock3, all features");
dock3->setWidget(te3);
addDockWidget(Qt::RightDockWidgetArea, dock3);

(3) QStackedWidget

label1 = new QLabel("WindowTest1");
label2 = new QLabel("WindowTest2");
label3 = new QLabel("WindowTest3");
widget = new MyWidget();
stack = new QStackedWidget(this);
stack->addWidget(label1);
stack->addWidget(label2);
stack->addWidget(label3);
stack->addWidget(widget);
stack->setCurrentIndex(1);

(4) 3가지 기본 레이아웃

QHBoxLayout
QVBoxLayout
QGridLayout

6. 중국어 난자 문제