問題描述

我對 qt 和 C++ 很陌生，但遇到了一個我似乎無法弄清楚的問題.當我單擊主 ui 上的按鈕時，我想打開一個無框且透明的窗口.當我按下主用戶界面上的按鈕時，我的代碼可以打開一個新窗口，但我似乎無法讓無框和透明部分工作.

I'm quite new to qt and c++ and I've encountered a problem that I can't seem to figure out. I'm wanting to open a frameless and transparent window when I click a button on the main ui. I've got the code working to open a new window when I press a button on the main ui but I can't seem to get the frameless and transparent part working.

這里是我為了學習這個而寫的小程序的源碼

Here is the source codes for the small program that I wrote to learn this

main.cpp

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

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

    return a.exec();
}

這里是 LearnWindow.h

Here is the 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

這里是learnwindow.cpp

Here is 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();
}

這里是transwindow.h

Here is the 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

這里是 transwindow.cpp

And here is 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;
}

在不同的源代碼中，您會看到注釋掉的行，這是我嘗試過的不同內容.在大多數情況下，問題是，如果我取消注釋掉任何試圖設置Qt::FramlessWindowHint"的行，程序會正常運行，但當我單擊主用戶界面上的按鈕時永遠不會打開新窗口.

In the different source codes you'll see commented out lines which is the different things that I've tried. For the most part the problem is, if I un-comment out any of the lines that try to set the "Qt::FramlessWindowHint" the program runs normally but never opens a new window when I click the button on the main ui.

如果我取消注釋掉我設置Qt::WA_TranslucentBackground"的任何行，當在主用戶界面中按下按鈕時，新窗口將打開，但新窗口的背景是黑色的，而不是透明.

If I un-comment out any of the lines where I set the "Qt::WA_TranslucentBackground" the new window will open up when when the button is pressed in the main ui but the background of the new window is black, not transparent.

其他可能相關的信息:linux: ubunto 12.04qt 5.0.2(64 位)qt 創作者 2.7.1

Other info that may be pertinent: linux: ubunto 12.04 qt 5.0.2 (64-bit) qt creator 2.7.1

推薦答案

試試這個:

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

這篇關于無框透明窗qt5的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！