Qt-Qt之使用QEventLoop说明
相关资料:
https://download.csdn.net/download/zhujianqiangqq/86727773 CSDN代码包下载
实例代码:
.pro
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1 QT += core gui 2 3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets 4 5 CONFIG += c++11 6 7 # The following define makes your compiler emit warnings if you use 8 # any Qt feature that has been marked deprecated (the exact warnings 9 # depend on your compiler). Please consult the documentation of the 10 # deprecated API in order to know how to port your code away from it. 11 DEFINES += QT_DEPRECATED_WARNINGS 12 13 # You can also make your code fail to compile if it uses deprecated APIs. 14 # In order to do so, uncomment the following line. 15 # You can also select to disable deprecated APIs only up to a certain version of Qt. 16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 17 18 SOURCES += \ 19 main.cpp \ 20 mainwindow.cpp 21 22 HEADERS += \ 23 mainwindow.h 24 25 FORMS += \ 26 mainwindow.ui 27 28 # Default rules for deployment. 29 qnx: target.path = /tmp/$${TARGET}/bin 30 else: unix:!android: target.path = /opt/$${TARGET}/bin 31 !isEmpty(target.path): INSTALLS += target
main.cpp
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1 #include "mainwindow.h" 2 3 #include <QApplication> 4 5 int main(int argc, char *argv[]) 6 { 7 QApplication a(argc, argv); 8 MainWindow w; 9 w.show(); 10 return a.exec(); 11 }
mainwindow.h
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1 #ifndef MAINWINDOW_H 2 #define MAINWINDOW_H 3 4 #include <QMainWindow> 5 #include <QTimer> 6 #include <QEventLoop> 7 #include <QDialog> 8 #include <windows.h> 9 10 QT_BEGIN_NAMESPACE 11 namespace Ui { class MainWindow; } 12 QT_END_NAMESPACE 13 14 class MainWindow : public QMainWindow 15 { 16 Q_OBJECT 17 18 public: 19 MainWindow(QWidget *parent = nullptr); 20 ~MainWindow(); 21 22 private slots: 23 void on_pushButton_clicked(); 24 25 void on_pushButton_2_clicked(); 26 27 void on_pushButton_3_clicked(); 28 29 void on_pushButton_4_clicked(); 30 31 void on_pushButton_5_clicked(); 32 33 void on_pushButton_6_clicked(); 34 35 private: 36 Ui::MainWindow *ui; 37 QEventLoop loop;//定义一个事件循环 38 }; 39 #endif // MAINWINDOW_H
mainwindow.cpp
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1 #include "mainwindow.h" 2 #include "ui_mainwindow.h" 3 4 MainWindow::MainWindow(QWidget *parent) 5 : QMainWindow(parent) 6 , ui(new Ui::MainWindow) 7 { 8 ui->setupUi(this); 9 10 setWindowTitle(QStringLiteral("Qt之使用QEventLoop说明")); 11 } 12 13 MainWindow::~MainWindow() 14 { 15 delete ui; 16 } 17 18 void MainWindow::on_pushButton_clicked() 19 { 20 loop.exec(); 21 ui->textEdit->append(QStringLiteral("loop exec OK!")); 22 } 23 24 void MainWindow::on_pushButton_2_clicked() 25 { 26 loop.quit(); 27 ui->textEdit->append(QStringLiteral("loop quit OK!")); 28 } 29 30 void MainWindow::on_pushButton_3_clicked() 31 { 32 ui->textEdit->append(QStringLiteral("Sleep 1 OK!")); 33 Sleep(3000); 34 ui->textEdit->append(QStringLiteral("Sleep 3000 OK!")); 35 } 36 37 void MainWindow::on_pushButton_4_clicked() 38 { 39 ui->textEdit->append(QStringLiteral("QEventLoop 1 OK!")); 40 QEventLoop eventloop; 41 QTimer::singleShot(3000, &eventloop, SLOT(quit())); 42 eventloop.exec(); 43 ui->textEdit->append(QStringLiteral("QEventLoop 3000 OK!")); 44 } 45 46 void MainWindow::on_pushButton_5_clicked() 47 { 48 QDialog dlg; 49 dlg.show(); 50 ui->textEdit->append(QStringLiteral("QDialog OK!")); 51 } 52 53 void MainWindow::on_pushButton_6_clicked() 54 { 55 QDialog dlg; 56 dlg.show(); 57 ui->textEdit->append(QStringLiteral("QDialog QEventLoop OK!")); 58 QEventLoop loop; 59 connect(&dlg, SIGNAL(finished(int)), &loop, SLOT(quit())); 60 loop.exec(QEventLoop::ExcludeUserInputEvents); 61 }
mainwindow.ui
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1 <?xml version="1.0" encoding="UTF-8"?> 2 <ui version="4.0"> 3 <class>MainWindow</class> 4 <widget class="QMainWindow" name="MainWindow"> 5 <property name="geometry"> 6 <rect> 7 <x>0</x> 8 <y>0</y> 9 <width>699</width> 10 <height>221</height> 11 </rect> 12 </property> 13 <property name="windowTitle"> 14 <string>MainWindow</string> 15 </property> 16 <widget class="QWidget" name="centralwidget"> 17 <layout class="QVBoxLayout" name="verticalLayout_2"> 18 <item> 19 <layout class="QHBoxLayout" name="horizontalLayout" stretch="2,3"> 20 <item> 21 <widget class="QTextEdit" name="textEdit"/> 22 </item> 23 <item> 24 <layout class="QVBoxLayout" name="verticalLayout"> 25 <item> 26 <layout class="QHBoxLayout" name="horizontalLayout_3"> 27 <item> 28 <widget class="QPushButton" name="pushButton_5"> 29 <property name="text"> 30 <string>QDialog 直接弹</string> 31 </property> 32 </widget> 33 </item> 34 <item> 35 <widget class="QPushButton" name="pushButton_6"> 36 <property name="text"> 37 <string>QDialog QEventLoop</string> 38 </property> 39 </widget> 40 </item> 41 </layout> 42 </item> 43 <item> 44 <layout class="QHBoxLayout" name="horizontalLayout_2"> 45 <item> 46 <widget class="QPushButton" name="pushButton"> 47 <property name="text"> 48 <string>loop.exec()</string> 49 </property> 50 </widget> 51 </item> 52 <item> 53 <widget class="QPushButton" name="pushButton_2"> 54 <property name="text"> 55 <string>loop.quit()</string> 56 </property> 57 </widget> 58 </item> 59 </layout> 60 </item> 61 <item> 62 <layout class="QHBoxLayout" name="horizontalLayout_4"> 63 <item> 64 <widget class="QPushButton" name="pushButton_3"> 65 <property name="text"> 66 <string>Sleep(3000)</string> 67 </property> 68 </widget> 69 </item> 70 <item> 71 <widget class="QPushButton" name="pushButton_4"> 72 <property name="text"> 73 <string>QEventLoop(3000)</string> 74 </property> 75 </widget> 76 </item> 77 </layout> 78 </item> 79 </layout> 80 </item> 81 </layout> 82 </item> 83 </layout> 84 </widget> 85 </widget> 86 <resources/> 87 <connections/> 88 </ui>
作者:疯狂Delphi
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