如何在Qt的屏幕上从左到右连续移动一系列图像？

Question

我有一定的窗口宽度。我有一系列恒定宽度和高度的图像进来。我想在一个窗口中从左到右滚动它们。我使用 QLabels 来显示图像。我已经在下面进行了图示。

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|图片1 |

然后图片2来了，应该显示在img1的左边

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| img2 img1 |

然后图像 3 出现在 img2 的左侧

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| img3 img2 img1 |

Qt 是如何实现的？

问候

Answer 1

下面是一个将左侧图像添加到前一个图像的代码示例。 代码注释会详细解释。整体结构为ScrollArea->ScrollAreaWidget->Horizo​​ntalLayout->No.Of.QLable(Image Display)

//scroll area
QScrollArea *scrollArea;
    //widget inside scroll area
    QWidget *scrollAreaWidgetContents;
    //Horizontal Box Layout
    QHBoxLayout *horizontalLayout;
    //Image loaded to find the width and height to resize the scroll area.   
    QImage img(QString::fromUtf8("../../../Downloads/red_star.png"));

    scrollArea = new QScrollArea(this->centralWidget());
    //Adding the size of the scrollbar with the image width
    int intWidth=img.width()*2.5+qApp->style()->pixelMetric(QStyle::PM_ScrollBarExtent)*2;
    //Adding the size of the scrollbar with the image Height
    int intHeight=img.height()+qApp->style()->pixelMetric(QStyle::PM_ScrollBarExtent)*2;

    scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    //Sizing the scroll area and the inside widget  
    scrollArea->setGeometry(QRect(0, 0,intWidth ,intHeight));
    scrollArea->setWidgetResizable(true);
    scrollAreaWidgetContents = new QWidget();
    scrollAreaWidgetContents->setGeometry(QRect(0, 0, intWidth, intHeight));
    Making the main window width to the scroll area width
    this->setFixedWidth(scrollArea->width());
    horizontalLayout = new QHBoxLayout(scrollAreaWidgetContents);
    scrollArea->setWidget(scrollAreaWidgetContents);
    //Image static array
    QString strImages[]= {"../../../Downloads/red_star.png","../../../Downloads/green_star.png","../../../Downloads/yellow_star.png"};
    //Add the image in the left side of the previous one (Note the color)
    for(int iCount=0; iCount<3; iCount++)
    {
        QLabel *label = new QLabel(QStringLiteral("label"),scrollAreaWidgetContents);
        label->setPixmap(QPixmap(strImages[iCount]));
        //Adding the new image to the left of previous image
        horizontalLayout->insertWidget(0,label);
    }

检查静态数组中的图像颜色