初始qt

day10/qtdemo0/main.cpp

@@ -0,0 +1,17 @@
+#include "widget.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    // 1. Qt 应用程序
+    QApplication a(argc, argv);
+
+    // 2. 应用程序中显示的主窗口
+    Widget w;
+    w.show();
+
+    // 3. 启动 Qt 程序, 监听窗口的相关事件
+    // 直到窗口关闭事件发生才退出
+    return a.exec(); // a.exec 的目的是保持程序活着
+}

day10/qtdemo0/qtdemo0.pro

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+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+CONFIG += c++11
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    main.cpp \
+    widget.cpp
+
+HEADERS += \
+    widget.h
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

day10/qtdemo0/widget.cpp

@@ -0,0 +1,41 @@
+#include "widget.h"
+#include <QApplication>
+#include <QPushButton>
+
+Widget::Widget(QWidget *parent)
+    : QWidget(parent)
+{
+    this->setWindowTitle("我是第一个小窗口");
+
+    //    this -> resize(200,300);
+
+    this->setFixedSize(QSize(480, 320));
+
+    // 创建一个按钮
+    // c++中创建类对象的两种方式:
+    // 1) 类名 对象 (构造函数的)
+    QPushButton *btn = new QPushButton("退出");
+    btn->resize(100, 50); // 设置控件的大小
+    btn->setParent(this); // 设置控件在哪一个窗口显示
+
+    btn->move(190, 135);
+
+    // connect(btn,&QPushButton::clicked,this,&QApplication::quit);
+    connect(btn, &QPushButton::clicked, this, &QWidget::close);
+
+    QPushButton *btn2 = new QPushButton("2");
+    btn2->resize(100, 50); // 设置控件的大小
+    btn2->setParent(this); // 设置控件在哪一个窗口显示
+
+    btn2->move(190 + 100, 135);
+
+    QPushButton *btn3 = new QPushButton("3");
+    btn3->resize(100, 50); // 设置控件的大小
+    btn3->setParent(this); // 设置控件在哪一个窗口显示
+
+    btn3->move(190 + 200, 135);
+}
+
+Widget::~Widget()
+{
+}

day10/qtdemo0/widget.h

@@ -0,0 +1,14 @@
+#ifndef WIDGET_H
+#define WIDGET_H
+
+#include <QWidget>
+
+class Widget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Widget(QWidget *parent = nullptr);
+    ~Widget();
+};
+#endif // WIDGET_H

day10/sumWidget/main.cpp

@@ -0,0 +1,11 @@
+#include "widget.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    Widget w;
+    w.show();
+    return a.exec();
+}

day10/sumWidget/sumWidget.pro

@@ -0,0 +1,28 @@
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+CONFIG += c++11
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    main.cpp \
+    widget.cpp
+
+HEADERS += \
+    widget.h
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

day10/sumWidget/widget.cpp

@@ -0,0 +1,56 @@
+#include "widget.h"
+#include <QDebug>
+
+
+Widget::Widget(QWidget *parent)
+    : QWidget(parent)
+{
+    setWindowTitle("加法计数器");
+
+    setFixedSize(500,100);
+
+    QPushButton *sumBtn=new QPushButton("计算",this);
+    sumBtn->setFixedSize(100,50);
+    sumBtn->move(300,25);
+
+    le1 = new QLineEdit(this);
+    le2 = new QLineEdit(this);
+    le1->setFixedSize(100,50);
+    le2->setFixedSize(100,50);
+    le1->move(0,25);
+    le2->move(200,25);
+
+    lable1 = new QLabel(this);
+    lable1->setText("+");
+    lable1->setFixedSize(10,50);
+    lable1->move(145,25);
+
+    lable2 = new QLabel(this);
+    lable2->setText("计算结果");
+    lable2->setFixedSize(100,50);
+    lable2->move(400,25);
+
+    connect(sumBtn,&QPushButton::clicked,this,&Widget::sum);
+
+
+//    connect(sumBtn,&QPushButton::clicked,this,lable2->setText(QString::number(c)));
+
+}
+
+void Widget::sum(){
+    lable2->setText("点击");
+    QString n1 = le1->text();
+    QString n2 = le2->text();
+    qDebug() << n1 << " " << n2;
+
+    // 将文本转化为数值
+    int ret = n1.toInt()+n2.toInt();
+    QString str = QString::number(ret);
+    qDebug() << str;
+    lable2->setText(str);
+}
+
+Widget::~Widget()
+{
+}
+

day10/sumWidget/widget.h

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+#ifndef WIDGET_H
+#define WIDGET_H
+
+#include <QWidget>
+#include <iostream>
+#include <QPushButton> // 按钮
+#include <QLineEdit> // 文本输入框
+#include <QLabel> // 文本标签
+
+class Widget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Widget(QWidget *parent = nullptr);
+    ~Widget();
+
+public slots:
+    // 自定义槽函数, 需要在源文件中去实现函数功能
+    void sum();
+
+private:
+    QLineEdit *le1,*le2;
+    QLabel *lable1,*lable2;
+
+};
+#endif // WIDGET_H