QT日常学习代码一
1、在QMainWindow中使用QAction：
// ========== mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class MainWindow
: public
QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent
= 0);
~MainWindow();
private:
void
open();
QAction *openAction;
};
#endif // MAINWINDOW_H
// ========== mainwindow.cpp
#include <QAction>
#include <QMenuBar>
#include <QMessageBox>
#include <QStatusBar>
#include <QToolBar>
#include "mainwindow.h"
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);
statusBar()
;
}
MainWindow::~MainWindow()
{
}
void
MainWindow::open()
{
QMessageBox::information(this,
tr("Information"),
tr("Open"));
}
// ========== main()
int
main(int
argc,
char *argv[])
{
QApplication
app(argc,
argv);
MainWindow
win;
win.show();
return
app.exec();
}
2、QT布局管理器：
int
main(int
argc,
char *argv[])
{
QApplication
app(argc,
argv);
QWidget
window;
window.setWindowTitle("Enter your age");
QSpinBox *spinBox
= new
QSpinBox(&window);
QSlider *slider
= new
QSlider(Qt::Horizontal,
&window);
spinBox->setRange(0,
130);
slider->setRange(0,
130);
QObject::connect(slider,
&QSlider::valueChanged,
spinBox,
&QSpinBox::setValue);
void
(QSpinBox::
*spinBoxSignal)(int)
= &QSpinBox::valueChanged;
QObject::connect(spinBox,
spinBoxSignal,
slider,
&QSlider::setValue);
spinBox->setValue(35);
QHBoxLayout *layout
= new
QHBoxLayout;
layout->addWidget(spinBox);
layout->addWidget(slider);
window.setLayout(layout);
window.show();
return
app.exec();
}
运行结果：
3、QT对话框
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();
}