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2_Sing08.pro

@@ -0,0 +1,39 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2020-02-08T18:10:09
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = 2_Sing08
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which has been marked as 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 you use 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
+
+CONFIG += c++11
+
+SOURCES += \
+        main.cpp \
+        mainwidget.cpp \
+    subwidget.cpp
+
+HEADERS += \
+        mainwidget.h \
+    subwidget.h
+CONFIG += C++11
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

README.md

@@ -1,19 +1 @@
-# practice
-平时练习的代码
-import numpy as np
-import matplotlib.pyplot as plt
-import math
-def draw_heart():
-    t=np.linspace(0,math.pi,1000)
-    x=np.sin(t)
-    y=np.cos(t)+np.power(x,2.0/3)
-    plt.plot(x,y,color='red',linewidth=2,label='h')
-    plt.plot(-x,y,color='red',linewidth=2,label='h')
-    plt.fill_between(x, y, where=(2.3<x) & (x<4.3) | (x>10))
-    plt.xlabel('t')
-    plt.ylabel('h')
-    plt.ylim(-2,2)
-    plt.xlim(-2,2)
-    plt.legend()
-    plt.show()
-draw_heart()
+为每日提高自己的练习代码

main.cpp

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+#include "mainwidget.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWidget w;
+    w.show();
+
+    return a.exec();
+}

mainwidget.cpp

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+#include "mainwidget.h"
+#include <QPushButton>
+MainWidget::MainWidget(QWidget *parent)
+    : QWidget(parent)
+{
+
+    b1.setParent(this);
+    b1.setText("close");
+    b1.move(100,100);
+
+    b2 = new QPushButton(this);
+    b2->setText("lalala");
+
+    connect(&b1, &QPushButton::pressed,this,&MainWidget::close);
+
+    connect(b2,&QPushButton::released,this,&MainWidget::mySlot);
+    connect(b2,&QPushButton::released,&b1,&QPushButton::hide);
+
+
+    setWindowTitle("老大");
+    b3.setParent(this);
+    b3.setText("切换到子窗口");
+    b3.move(50,50);
+
+    //w.show();
+
+    //处理子窗口信号
+    connect()
+
+    QPushButton *b5 = new QPushButton(this);
+    b5->setText("Lambbda");
+    int a=1,b=2;
+    connect(b5,&QPushButton::released(),
+            //= 把外部所有局部变量，类中所有成员一值传递   传进变量只读   修改加mutable
+            //& 外部所有局部变量
+            //this 类中所有
+            // （）中可以传参
+            [=]() mutable
+    {
+        b5->setText("fa");
+        qDebug() << "111";
+    })
+
+}
+
+void MainWidget::mySlot()
+{
+    b2->setText("123");
+}
+MainWidget::~MainWidget()
+{
+
+}

mainwidget.h

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+#ifndef MAINWIDGET_H
+#define MAINWIDGET_H
+
+#include <QWidget>
+#include <QPushButton>
+#include "subwidget.h"
+class MainWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    MainWidget(QWidget *parent = 0);
+    ~MainWidget();
+    void mySlot();
+private:
+    QPushButton b1;
+    QPushButton *b2;
+    QPushButton b3;
+    subWidget w;
+};
+
+#endif // MAINWIDGET_H

subwidget.cpp

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+#include "subwidget.h"
+
+subWidge::subWidge(QWidget *parent) : QWidget(parent)
+{
+    this->setWindowTitle("xiaodi");
+    b4,setParent(this);
+    b4.setText("切换到主窗口");
+
+    connect(&b4,&QPushButton::clicked,this,&subWidge::sendSlot);
+}
+
+void subWidge::sendSlot()
+{
+    emit mySignal();
+}

subwidget.h

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+#ifndef SUBWIDGE_H
+#define SUBWIDGE_H
+
+#include <QWidget>
+#include <QPushButton>
+class subWidge : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit subWidge(QWidget *parent = nullptr);
+    void sendSlot();
+
+signals:
+    /*信号就是函数的声明，只需声明，无需定义*/
+    void mySignal();
+
+public slots:
+
+private:
+    QPushButton b4;
+};
+
+#endif // SUBWIDGE_H