Qt——添加动作及对话框

//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include class MainWindow : public QMainWindow
{Q_OBJECT
public:MainWindow(QWidget *parent &＃61; 0);~MainWindow();private:void open();QAction *openAction;
};#endif // MAINWINDOW_H

//mainwindow.cpp
#include
#include
#include
#include
#include #include "mainwindow.h"//说明MainWindow构造函数前需要调用QMainWindow的含参构造函数
MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent)
{setWindowTitle(tr("Main Window"));//openAction构造函数&＃xff0c;传入一个图标、一个文本和this指针openAction &＃61; new QAction(QIcon(":/images/doc-open"), tr("&Open..."), this);//定义QAction的快捷键openAction->setShortcuts(QKeySequence::Open);//鼠标置于图标上 出现提示openAction->setStatusTip(tr("Open an existing file"));connect(openAction, &QAction::triggered, this, &MainWindow::open);//向菜单栏添加File菜单项 并将QAction对象添加到这个菜单QMenu *file &＃61; menuBar()->addMenu(tr("&File"));file->addAction(openAction);//增加一个File工具栏 把QAction对象添加到这个工具栏QToolBar *toolBar &＃61; addToolBar(tr("&File"));toolBar->addAction(openAction);//状态栏 位于底部
statusBar() ;
}MainWindow::~MainWindow()
{
}void MainWindow::open()
{QMessageBox::information(this, tr("Information"), tr("Open"));//使用对话框Dialog实现/*QDialog dialog(this); //or QDialog dislog();dialog.setWindowTitle(tr("Hello, dialog!"));dialog.exec();*/
}

//main.cpp
#include "mainwindow.h"
#include
#include
#include
#include int main(int argc, char *argv[])
{//QCoreApplication app(argc, argv);
QApplication app(argc,argv);MainWindow w;w.show();return app.exec();
}

void MainWindow::open()
{QDialog *dialog &＃61; new QDialog;dialog->setWindowTitle(tr("Hello, dialog!"));dialog->show();
}

//关闭对话框时自动销毁对象
dialog->setAttribute(Qt::WA_DeleteOnClose);

//dialog.h
#ifndef DIALOG_H
#define DIALOG_H#include namespace Ui {
class Dialog;
}class Dialog : public QDialog
{Q_OBJECTpublic:explicit Dialog(QWidget *parent &＃61; 0);~Dialog();private:Ui::Dialog *ui;signals:void sendData(QString);
private slots:void on_buttonBox_accepted();
};#endif // DIALOG_H

//MainWindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECT
public:MainWindow(QWidget *parent &＃61; 0);~MainWindow();
private:Ui::MainWindow *ui;private slots:void receiveData(QString data);};#endif // MAINWINDOW_H

//dialog.cpp
#include "dialog.h"
#include "ui_dialog.h"
#include Dialog::Dialog(QWidget *parent) :QDialog(parent),ui(new Ui::Dialog)
{ui->setupUi(this);
}Dialog::~Dialog()
{delete ui;
}void Dialog::on_buttonBox_accepted()
{emit sendData(ui->textEdit->toPlainText());
}

//mainwindow.cpp
#include
#include
#include
#include
#include #include "mainwindow.h"
#include "ui_mainwindow.h"
#include "dialog.h"MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);//信号槽方式下父子窗体传值的测试Dialog *dlg &＃61; new Dialog;//关联信号和槽函数connect(dlg,SIGNAL(sendData(QString)),this,SLOT(receiveData(QString)));// dlg->setModal(true); 不论是模态或者非模态都可以正常传值dlg->show();
}MainWindow::~MainWindow()
{
}void MainWindow::receiveData(QString data)
{ui->textEdit->setText(data);
}