Qwidget上未显示背景图像

有很多方法可以将背景色设置为窗口,

我给你一个简单的技巧。即超控, paintEvent 的 QWidget . 在那里画像素地图。

这是小部件代码示例,希望它能有所帮助

头文件

#ifndef QBACKGROUNDIMAGE_H
#define QBACKGROUNDIMAGE_H

#include <QtGui/QMainWindow>
#include "ui_QbackgroundImage.h"
#include <QtGui>

class backgroundImgWidget;

class QbackgroundImage : public QMainWindow
{
    Q_OBJECT

public:
    QbackgroundImage(QWidget *parent = 0);
    ~QbackgroundImage();

private:
    Ui::QbackgroundImage ui;
};

class backgroundImgWidget : public QWidget
{
     Q_OBJECT

public:
    backgroundImgWidget(QWidget *parent = 0);
    ~backgroundImgWidget();

protected:
    void paintEvent(QPaintEvent *p2);
};

#endif // QBACKGROUNDIMAGE_H

CPP文件

#include "QbackgroundImage.h"

QbackgroundImage::QbackgroundImage(QWidget *parent)
    : QMainWindow(parent)
{
    // ui.setupUi(this);

    backgroundImgWidget* widget = new backgroundImgWidget();
    setCentralWidget(widget);
}

QbackgroundImage::~QbackgroundImage()
{
}

backgroundImgWidget::backgroundImgWidget(QWidget *parent):QWidget(parent)
{
}

backgroundImgWidget::~backgroundImgWidget()
{
}

void backgroundImgWidget::paintEvent(QPaintEvent *p2)
{
    QPixmap pixmap;

    pixmap.load(":/new/prefix1/Sunset.jpg");

    QPainter paint(this);
    paint.drawPixmap(0, 0, pixmap);
    QWidget::paintEvent(p2);
}

你可以重新实现 paintEvent :

void Widget::paintEvent( QPaintEvent* e )
{
    QPainter painter( this );
    painter.drawPixmap( 0, 0, QPixmap(":/new/prefix1/picture001.png").scaled(size()));

    QWidget::paintEvent( e );
}