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32


CusIconStyle* 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*32
class CusIconStyle: public QProxyStyle
{
Q_OBJECT
public:
CusIconStyle();
~CusIconStyle(){}
int pixelMetric(PixelMetric metric, const QStyleOption * option, const QWidget * widget) const;
};

#endif // CUSICONSTYLE_H