qt5.2.1在linux下去除最大化和最小化按钮

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#include <QtGui/QGuiApplication>

#include <QDebug>

#include <QScreen>

#include "qtquick2applicationviewer.h"

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

{

    QGuiApplication app(argc, argv);

    QScreen *screen=app.screens()[0];

    int
width=screen->size().width();

    int
height=screen->size().height();

    QtQuick2ApplicationViewer viewer;

    viewer.setMainQmlFile(QStringLiteral("qml/untitled2/main.qml"));

    viewer.setMaximumSize(QSize(500,500));

    viewer.setMinimumSize(QSize(500,500));

    viewer.setFlags(Qt::WindowCloseButtonHint);//Qt::FramelessWindowHint |

    viewer.setPosition(width/2 - viewer.width()/2 , height/2 - viewer.height()/2 );

    viewer.show();

    return
app.exec();

}