QT学习笔记（1）

QT学习笔记（1）

 

 

 

 

 

停靠窗口dock

#include "dockwin.h"
#include<QWidget>
#include<QMainWindow>
#include<QTextEdit>
#include<QDockWidget>
 
 
DockWin::DockWin(QWidget *parent):QMainWindow(parent)
{
    resize(400,200);
    setWindowTitle(tr("停靠窗口测试"));
    //主窗口
    QTextEdit *t0=new QTextEdit(this);
    t0->setText("主窗口");
    t0->setAlignment(Qt::AlignCenter);
    setCentralWidget(t0);
    //第一个浮动窗口
    QDockWidget *dock1=new QDockWidget("停靠窗口1",this);
    dock1->setAllowedAreas(Qt::LeftDockWidgetArea|Qt::RightDockWidgetArea);
    QTextEdit *t1=new QTextEdit("可左右停靠");
    dock1->setWidget(t1);
    addDockWidget(Qt::RightDockWidgetArea,dock1);
    //第二个浮动窗口
    QDockWidget* dock2=new QDockWidget("停靠窗口2",this);
    dock2->setFeatures(QDockWidget::DockWidgetClosable|QDockWidget::DockWidgetFloatable);
    QTextEdit *t2=new QTextEdit("可关闭，可浮动");
    dock2->setWidget(t2);
    addDockWidget(Qt::RightDockWidgetArea,dock2);
    //第三个浮动窗口
    QDockWidget *dock3=new QDockWidget("停靠窗口3");
    dock3->setFeatures(QDockWidget::NoDockWidgetFeatures);
    QTextEdit *t3=new QTextEdit("禁用所有功能");
    dock3->setWidget(t3);
    addDockWidget(Qt::RightDockWidgetArea,dock3);
 
}

运行结果

布局splitter

#include<QApplication>
#include<QFont>
#include<QSplitter>
#include<QTextEdit>
 
int main(int argc,char*argv[])
{
    QApplication a(argc,argv);
QFont font("ZYSong18030",18);
a.setFont(font);
//左侧QSplitter
QSplitter* left=new QSplitter(Qt::Horizontal,0);
QTextEdit* text1=new QTextEdit(QObject::tr("Left Widget"),left);
text1->setAlignment(Qt::AlignCenter);
//右侧QSplitter
QSplitter*right=new QSplitter(Qt::Vertical,left);
QTextEdit *text2=new QTextEdit(QObject::tr("Right Top"),right);
text2->setAlignment(Qt::AlignCenter);
QTextEdit *text3=new QTextEdit(QObject::tr("Right Middle"),right);
text3->setAlignment(Qt::AlignCenter);
QTextEdit *text4=new QTextEdit(QObject::tr("Right Bottom"),right);
text4->setAlignment(Qt::AlignCenter);
 
left->show();
    return a.exec();
}

运行结果

菜单栏和工具栏

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QMenuBar>
#include<QMenu>
#include<QAction>
#include<QtDebug>
#include<QToolBar>
#include<QPushButton>
#include<QStatusBar>
#include<QLabel>
#include<QTextEdit>
#include<QDockWidget>
 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //菜单栏
    QMenuBar* mbar=menuBar();
    QMenu *mFile= mbar->addMenu("文件");
    QMenu *mEdit= mbar->addMenu("编辑");
    QAction *aNew= mFile->addAction("新建");
 
    connect(aNew,QAction::triggered,
            [=](){qDebug()<<"点击新建按钮"; }
    );
    mFile->addSeparator();
    QAction *aOpen= mFile->addAction("打开");
    connect(aOpen,QAction::triggered,
            [=](){qDebug()<<"点击编辑按钮";}
    );
    //工具栏
    QToolBar *tbar=addToolBar("tb");
    tbar->addAction(aNew);
    QPushButton *b=new QPushButton("(^-^)");
 
    tbar->addWidget(b);
    connect(b,QPushButton::clicked,
            [=](){b->setText("o(╥﹏╥)o");}
    );
    //状态栏
QStatusBar*sbar=statusBar();
QLabel *l=new QLabel();
l->setText("状态栏");
sbar->addWidget(l);
sbar->addWidget(new QLabel("222"));
//从右往左添加addPermanentWidget
sbar->addPermanentWidget(new QLabel("333"));
//文本编辑器
QTextEdit *t=new QTextEdit(this);
setCentralWidget(t);
//浮动窗口
QDockWidget* dock=new QDockWidget();
addDockWidget(Qt::RightDockWidgetArea,dock);
QTextEdit *t2=new QTextEdit(this);
dock->setWidget(t2);
 
 
}

运行结果

模态对话框和非模态对话框

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QMenu>
#include<QMenuBar>
#include<QAction>
#include<QDialog>
 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QMenuBar *mbar=menuBar();
    setMenuBar(mbar);
    QMenu *m=mbar->addMenu("对话框");
    QAction *ac1=m->addAction("模态对话框");
    connect(ac1,QAction::triggered,
            [=](){    QDialog *dia1=new QDialog(this);
        dia1->resize(200,100);
        dia1->exec();}        );
 
    QAction *ac2=m->addAction("非模态对话框");
    connect(ac2,QAction::triggered,
            [=](){    QDialog *dia2=new QDialog(this);
 dia2->resize(200,100);
        dia2->setAttribute(Qt::WA_DeleteOnClose);
        dia2->show();}        );
 
 
 
}

运行结果

我的计算器

#include "cal.h"
#include "ui_cal.h"
#include<QString>
 
Cal::Cal(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Cal)
{
    ui->setupUi(this);
}
 
Cal::~Cal()
{
    delete ui;
}
 
//通过按键获取输入
QString input="";
void Cal::on_pushButton1_clicked()
{
    input+="1";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton2_clicked()
{
    input+="2";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton3_clicked()
{
    input+="3";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton4_clicked()
{
    input+="4";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton5_clicked()
{
    input+="5";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton6_clicked()
{
    input+="6";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton7_clicked()
{
    input+="7";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton8_clicked()
{
    input+="8";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton9_clicked()
{
    input+="9";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButton0_clicked()
{
    input+="0";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButtonAdd_clicked()
{
    input+="+";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButtonSub_clicked()
{
    input+="-";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButtonMul_clicked()
{
    input+="*";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButtonDiv_clicked()
{
    input+="/";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButtonEqu_clicked()
{
    Cal:: Calculate( input);
    //input+="=";
    ui->label_display->setText(input);
}
 
void Cal::on_pushButtonClear_clicked()
{
    input="";
    ui->label_display->setText(input);
}
 
//计算
#include<QStringList>
 
void Cal:: Calculate( QString &s)
{
    int a,b;
    QStringList list;
    if(s.contains("+"))
    {
        list=  s.split("+");
        if(list.length()==2)
        {
            a=list[0].toInt();
            b=list[1].toInt();
            s.setNum(a+b);
        }
        else{    s="error";}
    }
    else if(s.contains("-"))
    {
        list=  s.split("-");
        if(list.length()==2)
        {
            a=list[0].toInt();
            b=list[1].toInt();
            s.setNum(a-b);
        }
        else    {        s="error";    }
 
    }
    else if(s.contains("*"))
    {
        list=  s.split("*");
        if(list.length()==2)
        {
            a=list[0].toInt();
            b=list[1].toInt();
            s.setNum(a*b);
        }
        else    {        s="error";    }
 
    }
    else if(s.contains("/"))
    {
        list=  s.split("/");
        if(list.length()==2)
        {
            a=list[0].toInt();
            b=list[1].toInt();
            if(b==0)
            {
                s="error";
                return;
            }
            s.setNum(a/b);
        }
        else    {        s="error";    }
 
    }
 
}

运行结果

表格测试

#include<QApplication>
#include<QWidget>
#include<QLabel>
#include<QTableWidget>
#include<QTableWidgetItem>
#include<QStringList>
#include<QDebug>
#include<QPushButton>
 
using namespace std;
 
class MyLabel:public QLabel
{
 
    //Q_OBJECT
public slots://自定义槽函数
    void resetText(QTableWidgetItem*item);
 
};
//槽函数的类外实现
void MyLabel::resetText(QTableWidgetItem *item)
{this->setText(item->text());}
//主函数
int main(int argc,char*argv[])
{
    QApplication a(argc,argv);
QWidget w;
w.setWindowTitle("我的表格窗口");
w.resize(1000,500);
QTableWidget t(4,3,&w);
t.resize(1000,400);
t.setFont(QFont("宋体",20));
t.setHorizontalHeaderLabels(QStringList()<<"标题"<<"网址"<<"作者");
t.setEditTriggers(QAbstractItemView::NoEditTriggers);
t.setItem(0,0,new QTableWidgetItem("QT学习笔记（1）"));
t.setItem(0,1,new QTableWidgetItem("https://www.cnblogs.com/zhangdezhang/p/16277071.html"));
t.setItem(0,2,new QTableWidgetItem("zdz"));
t.setItem(1,0,new QTableWidgetItem("C++学习笔记（2）"));
t.setItem(1,1,new QTableWidgetItem("https://www.cnblogs.com/zhangdezhang/p/16268859.html"));
t.setItem(1,2,new QTableWidgetItem("zdz"));
t.setItem(2,0,new QTableWidgetItem("C++学习笔记（1）"));
t.setItem(2,1,new QTableWidgetItem("https://www.cnblogs.com/zhangdezhang/p/16264787.html"));
t.setItem(2,2,new QTableWidgetItem("zdz"));
 
MyLabel label;
label.setText("请选择一个单元格");
label.setParent(&w);
label.resize(900,150);
label.move( QPoint(0,400));
label.setAlignment(Qt::AlignCenter);
label.setFont(QFont("宋体",30));
 
QObject::connect(&t,QTableWidget::itemClicked,&label,MyLabel::resetText);
 
w.show();
   return a.exec();
 
}

运行结果

按钮测试

#include<QApplication>
#include<QPushButton>
 
//按钮测试
 
int main(int argc,char*argv[])//主函数
{
    QApplication a(argc,argv);//创建应用
 
    QWidget w;//创建窗口
    w.setWindowTitle("QT真是牛逼");//设置窗口标题
    w.setStyleSheet("QWidget{background-color:green;}");//窗体背景绿色
    QPushButton b("QPushButton按钮",&w);//设置父对象
    b.move(100,100);//设置位置
    //设置字体大小，设置背景颜色
    b.setStyleSheet("QPushButton{font:20px;background-color:red;}");
    b.resize(200,200);//设置尺寸
    //设置信号槽，点击按钮--按钮隐藏
    QObject::connect(&b,QPushButton::clicked,&b,QPushButton::hide);
 
 
    w.show();//显示窗口
    return a.exec();//循环等待
}

运行结果

QT思维导图

QT的信号槽的消息机制（事件/委托-事件处理函数）；

QObject::connect(&b,QPushButton::clicked,&w,QWidget::close);