标签：doc exist color 自己的 str text 顶层窗口 parent abs
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
setWindowTitle(tr("Main Window"));
openAction = new QAction(QIcon(":/images/doc-open"), tr("&Open..."), this);
openAction->setShortcuts(QKeySequence::Open);
openAction->setStatusTip(tr("Open an existing file"));
connect(openAction, &QAction::triggered, this, &MainWindow::open);
QMenu *file = menuBar()->addMenu(tr("&File"));
file->addAction(openAction);
QToolBar *toolBar = addToolBar(tr("&File"));
toolBar->addAction(openAction);
}
MainWindow::~MainWindow()
{
}
void MainWindow::open()
{
QDialog dialog;
dialog.setWindowTitle(tr("Hello, dialog!"));
dialog.exec();
}MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent){ setWindowTitle(tr("Main Window")); openAction = new QAction(QIcon(":/images/doc-open"), tr("&Open..."), this); openAction->setShortcuts(QKeySequence::Open); openAction->setStatusTip(tr("Open an existing file")); connect(openAction, &QAction::triggered, this, &MainWindow::open); QMenu *file = menuBar()->addMenu(tr("&File")); file->addAction(openAction); QToolBar *toolBar = addToolBar(tr("&File")); toolBar->addAction(openAction);} MainWindow::~MainWindow(){} void MainWindow::open(){ QDialog dialog; dialog.setWindowTitle(tr("Hello, dialog!")); dialog.exec();}QDialog类实现对话框。就像主窗口一样，我们通常会设计一个类继承QDialog。QDialog（及其子类，以及所有Qt::Dialog类型的类）的对于其 parent
指针都有额外的解释：如果 parent 为 NULL，则该对话框会作为一个顶层窗口，否则则作为其父组件的子对话框（此时，其默认出现的位置是
parent 的中心）。顶层窗口与非顶层窗口的区别在于，顶层窗口在任务栏会有自己的位置，而非顶层窗口则会共享其父组件的位置。void MainWindow::open()
{
QDialog dialog(this);
dialog.setWindowTitle(tr("Hello, dialog!"));
dialog.show();
}
//这样的写法，出来的窗口不会停留
void MainWindow::open()
{
QDialog *dialog = new QDialog;
dialog->setWindowTitle(tr("Hello, dialog!"));
dialog->show();
}
//这样的窗口才会停留。void MainWindow::open(){ QDialog dialog(this); dialog.setWindowTitle(tr("Hello, dialog!")); dialog.show();}//这样的写法，出来的窗口不会停留void MainWindow::open(){ QDialog *dialog = new QDialog; dialog->setWindowTitle(tr("Hello, dialog!")); dialog->show();}//这样的窗口才会停留。void MainWindow::open()
{
QDialog *dialog = new QDialog;
dialog->setAttribute(Qt::WA_DeleteOnClose);
dialog->setWindowTitle(tr("Hello, dialog!"));
dialog->show();
}void MainWindow::open(){ QDialog *dialog = new QDialog; dialog->setAttribute(Qt::WA_DeleteOnClose); dialog->setWindowTitle(tr("Hello, dialog!")); dialog->show();}
void MainWindow::open()
{
QDialog dialog(this);
dialog.setWindowTitle(tr("Hello, dialog!"));
dialog.exec();
qDebug() << dialog.result();
}
因为exec()的返回值是QDialog::Accepted或者QDialog::Rejected，因此也可以用返回值来选择做一些事情。
比如
QDialog dialog(this);
if (dialog.exec() == QDialog::Accepted) {
// do something
} else {
// do something else
}x
void MainWindow::open(){ QDialog dialog(this); dialog.setWindowTitle(tr("Hello, dialog!")); dialog.exec(); qDebug() << dialog.result();}因为exec()的返回值是QDialog::Accepted或者QDialog::Rejected，因此也可以用返回值来选择做一些事情。比如QDialog dialog(this);if (dialog.exec() == QDialog::Accepted) { // do something} else { // do something else}//!!! Qt 5
// in dialog:
void UserAgeDialog::accept()
{
emit userAgeChanged(newAge); // newAge is an int
QDialog::accept();
}
// in main window:
void MainWindow::showUserAgeDialog()
{
UserAgeDialog *dialog = new UserAgeDialog(this);
connect(dialog, &UserAgeDialog::userAgeChanged, this, &MainWindow::setUserAge);
dialog->show();
}
// ...
void MainWindow::setUserAge(int age)
{
userAge = age;
}//!!! Qt 5// in dialog:void UserAgeDialog::accept(){ emit userAgeChanged(newAge); // newAge is an int QDialog::accept();} // in main window:void MainWindow::showUserAgeDialog(){ UserAgeDialog *dialog = new UserAgeDialog(this); connect(dialog, &UserAgeDialog::userAgeChanged, this, &MainWindow::setUserAge); dialog->show();} // ... void MainWindow::setUserAge(int age){ userAge = age;}
标签：doc exist color 自己的 str text 顶层窗口 parent abs
原文地址：https://www.cnblogs.com/LyndonMario/p/9326284.html
