无框和透明窗口qt5

Question

我对qt和c ++很新,我遇到了一个我似乎无法弄清楚的问题.当我点击主ui上的按钮时,我想打开一个无框和透明的窗口.当我按下主ui上的按钮时,我已经有代码工作打开一个新窗口,但我似乎无法使无框和透明部分工作.

这是我为了解这个而编写的小程序的源代码

main.cpp中

#include "learnwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    LearnWindow w;
    w.show();

    return a.exec();
}

这是LearnWindow.h

#ifndef LEARNWINDOW_H
#define LEARNWINDOW_H

#include <QMainWindow>
#include <transwindow.h>

namespace Ui {
class LearnWindow;
}

class LearnWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit LearnWindow(QWidget *parent = 0);
    ~LearnWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::LearnWindow *ui;
    TransWindow *winTrans;

public slots:
    void openTrans();
};

#endif // LEARNWINDOW_H

这是learnwindow.cpp

#include "learnwindow.h"
#include "ui_learnwindow.h"

LearnWindow::LearnWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::LearnWindow)
{
    ui->setupUi(this);
}

LearnWindow::~LearnWindow()
{
    delete ui;
}

void LearnWindow::openTrans()
{
    winTrans = new TransWindow (this);
    //winTrans->setWindowTitle("NewWin");
   // winTrans->setWindowFlags(Qt::FramelessWindowHint | Qt::X11BypassWindowManagerHint);
    //winTrans->setAttribute(Qt::WA_TranslucentBackground,true);
    //winTrans->setAutoFillBackground(false);
    //winTrans->setStyleSheet("background:transparent;");
    winTrans->show();
}

void LearnWindow::on_pushButton_clicked()
{
    openTrans();
}

这是transwindow.h

#ifndef TRANSWINDOW_H
#define TRANSWINDOW_H

#include <QDialog>

namespace Ui {
class TransWindow;
}

class TransWindow : public QDialog
{
    Q_OBJECT

public:
    explicit TransWindow(QWidget *parent = 0);

    //setWindowFlags(windowFlags()| Qt::FramelessWindowHint);

    ~TransWindow();

private:
    Ui::TransWindow *ui;
};

#endif // TRANSWINDOW_H

这是transwindow.cpp

#include "transwindow.h"
#include "ui_transwindow.h"

TransWindow::TransWindow(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::TransWindow)
{
    //setWindowTitle("NewWin");
    //setWindowFlags(Qt::FramelessWindowHint);
    //setAttribute(Qt::WA_TranslucentBackground,true);
    ui->setupUi(this);
}

TransWindow::~TransWindow()
{
    delete ui;
}

在不同的源代码中,您将看到注释掉的行,这是我尝试过的不同内容.问题是,如果我取消注释试图设置"Qt :: FramlessWindowHint"的任何行,程序正常运行但是当我点击主ui上的按钮时从不打开新窗口.

如果我取消注释我设置"Qt :: WA_TranslucentBackground"的任何行,当在主ui中按下按钮但新窗口的背景为黑色而不是透明时,新窗口将打开.

其他可能相关的信息:linux:ubunto 12.04 qt 5.0.2(64位)qt creator 2.7.1

Answer 1

试试这个:

setWindowFlags(Qt::Widget | Qt::FramelessWindowHint);
setParent(0); // Create TopLevel-Widget
setAttribute(Qt::WA_NoSystemBackground, true);
setAttribute(Qt::WA_TranslucentBackground, true);  
setAttribute(Qt::WA_PaintOnScreen); // not needed in Qt 5.2 and up