保存 QML 图像 [英] saving QML image

问题描述

如何将 QML Image 保存到手机内存中??

How can I save QML Image into phone memory ??

如果保存图像是适用的，我有这种情况，我需要在图像中添加一些文本(我们可以想象它，因为我们有一个透明图像[保存文本]并将其放在第二个图像上，所以最后我们有一张图片可以保存到手机内存中)

also if saving the image was applicable , I have this case which I need to add some text to the image (we can imagine it as we have a transparent image[that hold the text] and put it over the second image , so finally we have one image that we can save it into phone memory)

推荐答案

不是直接来自Image.QDeclarativeImage 有 pixmap、setPixmap 和 pixmapChange 方法，但由于某种原因没有声明属性.所以你不能在 qml 中使用它.不幸的是，它也不能在 C++ 中使用——它是一个私有类.

Not from Image directly. QDeclarativeImage has pixmap, setPixmap and pixmapChange methods, but for some reason there is no property declared. So you cannot use it fom qml. Unfortunately it cannot be used from C++ either - it is a private calsss.

您可以将图形项目绘制到像素图并将其保存到文件中.

What you can do is paint graphics item to your pixmap and save it to file.

class Capturer : public QObject
{
    Q_OBJECT
public:
    explicit Capturer(QObject *parent = 0);
    Q_INVOKABLE void save(QDeclarativeItem *obj);
};

void Capturer::save(QDeclarativeItem *item)
{
    QPixmap pix(item->width(), item->height());
    QPainter painter(&pix);
    QStyleOptionGraphicsItem option;
    item->paint(&painter, &option, NULL);
    pix.save("/path/to/output.png");
}

注册捕获者"上下文变量:

Register "capturer" context variable:

int main()
{
    // ...
    Capturer capturer;
    QmlApplicationViewer viewer;
    viewer.rootContext()->setContextProperty("capturer", &capturer);
    // ...
}

并在你的 qml 中使用它:

And use it in your qml:

Rectangle {
    // ...
    Image {
        id: img
        source: "/path/to/your/source"
    }
    MouseArea {
        anchors.fill: parent
        onClicked: {
            capturer.save(img)
        }
    }
}

这篇关于保存 QML 图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！