qt 自定义菜单

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

MainWindow w;

w.show();

return a.exec();

}

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

MainWindow(QWidget *parent = 0);

~MainWindow();

};

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include "QMenu"

#include "qwidgetaction.h"

#include "menuitem.h"

#include "QPushButton"

MainWindow::MainWindow(QWidget *parent)

: QMainWindow(parent)

{

QMenu* menu = new QMenu(this);

QWidgetAction* action = new QWidgetAction( this );

MenuItem* item = new MenuItem();

action->setDefaultWidget( item );

menu->addAction( action );

menu->addAction( "menu 1");

QPushButton* btn = new QPushButton( this );

btn->setMenu( menu );

}

MainWindow::~MainWindow()

{

#ifndef MENUITEM_H

#define MENUITEM_H

#include <QWidget>

class MenuItem : public QWidget

{

public:

MenuItem(QWidget *parent = 0 );

};

#endif // MENUITEM_H

#include "menuitem.h"

#include "QLabel"

#include "QVBoxLayout"

MenuItem::MenuItem(QWidget *parent) :

QWidget(parent) {

QVBoxLayout* layout = new QVBoxLayout();

QLabel* label1 = new QLabel( "label1" );

layout->addWidget( label1 );

QLabel* label2 = new QLabel( "label2" );

layout->addWidget( label2 );

this->setLayout( layout  );

}

菜单默认图标是16， 修改为32CusIconStyle* m_pCuStyle = new CusIconStyle;menu.setStyle(m_pCuStyle );#include "cusiconstyle.h"CusIconStyle::CusIconStyle():QProxyStyle(){}int CusIconStyle::pixelMetric(PixelMetric metric, const QStyleOption * option, const QWidget * widget) const{int s = QProxyStyle::pixelMetric(metric, option, widget);if (metric == QStyle::PM_SmallIconSize) {s = 32;}return s;}#ifndef CUSICONSTYLE_H#define CUSICONSTYLE_H#include <QProxyStyle>// set menu item icon from 16*16 to 32*32class CusIconStyle: public QProxyStyle{Q_OBJECTpublic:CusIconStyle();~CusIconStyle(){}int pixelMetric(PixelMetric metric, const QStyleOption * option, const QWidget * widget) const;};#endif // CUSICONSTYLE_H