问题描述
我正在保存带有多个 QML 子级的 QQuickWidget
的图像,但我只有一张空白图像.
I am saving an image of a QQuickWidget
with several QML children but all I have is a blank image.
C++ 方面:
QQuickWidget* content..
content->setSource(QUrl("qml:/main.qml"));
QPixmap *pm = content->grab(QRect(QPoint(0,0),QSize(-1,-1));
pm->save("someFilename.png", 0, 100);
QML 方面:
Rectangle{ width: 5; height: 5; color: "yellow"; objectname: "rootobj"}
在 QML 中,我希望动态添加子元素并能够在图像中显示它们.我尝试了 QQuickWindow
grabWindow
方法与插槽的连接,它可以工作,但它只捕获窗口可见区域,我需要捕获整个 QML.
In the QML I wish to dynamically add children and be able to show them in the image. I have tried QQuickWindow
grabWindow
method with a connection to a slot and it works but it captures only the window visible area and I need to capture the whole QML.
我相信这不是火箭科学,只是我没有得到它.感谢您的回复!
I believe this is not rocket science just that I am not getting it somewhere. Thanks for your replies!
附录:
好的,我不认为这是渲染前后的问题,因为在调用图片抓取器之前我可以看到所有 qml 子项.很抱歉不准确.
Ok, I do not think its the issue of before/after rendering since I can see all the qml children before I call the picture grabber. So sorry for not being precise.
c++端:
QQuickWidget* content..
content->setSource(QUrl("qml:/main.qml"));
//do all my dynamic qml children adding
在我可以直观地看到我所有的 qml 之后:
After I can visually see all my qml:
QPixmap *pm = content->grab(QRect(QPoint(0,0),QSize(-1,-1));
pm->save(....
除非我错了,否则我不认为它的渲染问题.谢谢!
Unless I am wrong, I dont think its rendering issue. Thank you!
推荐答案
问题就像美度说的.你可以像下面这样解决它.
Issue is like Mido said. You can solve it like follows.
创建一个类Viewer
:
class Viewer : public QQuickView{
Q_OBJECT
public:
explicit Viewer(QWindow *parent = 0);
Viewer(bool showBar);
virtual ~Viewer();
void setMainQmlFile(const QString file);
void addImportPath(const QString path);
public slots:
void beforeRendering();
void afterRendering()
}
查看器.cpp
#include "viewer.h"
Viewer::Viewer(QWindow *parent)
: QQuickView(parent)
{
setWidth(800);
setHeight(480);
connect(this, SIGNAL(beforeRendering()), this, SLOT(beforeRendering()));
connect(this, SIGNAL(afterRendering()), this, SLOT(afterRendering()));
}
void Viewer::setMainQmlFile(const QString file)
{
setSource(QUrl::fromLocalFile(file));
}
void Viewer::addImportPath(const QString path)
{
engine()->addImportPath(path);
}
void Viewer::beforeRendering()
{
//
}
void Viewer::afterRendering()
{
//grab window
QImage img = this->grabWindow();
img.save(path);
//or your code
}
main.cpp
Viewer *viewer = new Viewer;
//
///
//
viewer->setMainQmlFile(QStringLiteral("qml/main.qml"));
viewer->show();
这篇关于QQuickWidget 抓图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!