以下这句代码的含义是什么?connect(writeModel, &WriteRegisterModel::updateViewport, ui->writeValueTable->viewport(), QOverload<>::of(&QWidget::update));
时间: 2023-05-29 12:04:58 浏览: 78
&QAbstractItemModel::dataChanged, this, &MyClass::onDataChanged)
这句代码的含义是:连接一个信号(writeModel的dataChanged信号)到一个槽函数(MyClass的onDataChanged槽函数)。当writeModel的dataChanged信号被触发时,MyClass的onDataChanged槽函数将被调用。
相关问题
怎么将osgViewer::Viewer嵌入ui->openGLWidget
将 `osgViewer::Viewer` 嵌入到 `QOpenGLWidget` 中,可以通过以下步骤实现:
1. 继承 `QOpenGLWidget` 类,并实现以下虚函数:
```cpp
class OsgWidget : public QOpenGLWidget, protected QOpenGLFunctions
{
public:
OsgWidget(QWidget* parent = nullptr);
virtual ~OsgWidget();
protected:
void initializeGL() override;
void resizeGL(int w, int h) override;
void paintGL() override;
void paintEvent(QPaintEvent* event) override;
void keyPressEvent(QKeyEvent* event) override;
void keyReleaseEvent(QKeyEvent* event) override;
void mousePressEvent(QMouseEvent* event) override;
void mouseReleaseEvent(QMouseEvent* event) override;
void mouseMoveEvent(QMouseEvent* event) override;
bool event(QEvent* event) override;
};
```
其中,`initializeGL`、`resizeGL` 和 `paintGL` 函数用于初始化 OpenGL 上下文并绘制场景,`paintEvent` 函数用于处理重绘事件,`keyPressEvent`、`keyReleaseEvent`、`mousePressEvent`、`mouseReleaseEvent` 和 `mouseMoveEvent` 函数用于处理键盘和鼠标事件,`event` 函数用于处理其他事件。
2. 在 `initializeGL` 函数中创建 `osgViewer::GraphicsWindow` 对象,并将其关联到 `osgViewer::Viewer` 对象中:
```cpp
void OsgWidget::initializeGL()
{
// Create an OSG graphics context
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->windowName = "OSG Widget";
traits->x = 0;
traits->y = 0;
traits->width = width();
traits->height = height();
traits->doubleBuffer = true;
traits->windowDecoration = false;
traits->sharedContext = 0;
// Create an OSG graphics window
osg::ref_ptr<osgViewer::GraphicsWindow> gw = osg::GraphicsContext::createGraphicsWindow(traits.get());
// Create an OSG viewer
osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
viewer->getCamera()->setGraphicsContext(gw);
viewer->getCamera()->setViewport(new osg::Viewport(0, 0, traits->width, traits->height));
// Set the viewer's scene data
osg::ref_ptr<osg::Node> scene = createSceneGraph();
viewer->setSceneData(scene.get());
// Save the viewer pointer for later use
m_viewer = viewer;
}
```
其中,`createSceneGraph` 函数用于创建 OSG 场景图。
3. 在 `paintGL` 函数中将 `osgViewer::Viewer` 的帧缓冲区绑定到 `QOpenGLWidget` 的帧缓冲区,并使用 `osgViewer::Viewer::frame` 函数绘制一帧:
```cpp
void OsgWidget::paintGL()
{
// Bind OSG's frame buffer object to the OpenGL context
m_viewer->getCamera()->getGraphicsContext()->realizeOpenGLContext();
m_viewer->getCamera()->getGraphicsContext()->makeCurrent();
m_viewer->getCamera()->getGraphicsContext()->bindPBufferToTexture();
// Draw a frame
m_viewer->frame();
// Swap the buffers
m_viewer->getCamera()->getGraphicsContext()->swapBuffers();
}
```
4. 在 `resizeGL` 函数中更新 `osgViewer::Viewer` 的视口:
```cpp
void OsgWidget::resizeGL(int w, int h)
{
// Update OSG's viewport
m_viewer->getCamera()->setViewport(new osg::Viewport(0, 0, w, h));
}
```
5. 在 `paintEvent` 函数中强制刷新 `QOpenGLWidget`:
```cpp
void OsgWidget::paintEvent(QPaintEvent* event)
{
// Force redraw
update();
}
```
6. 将 `OsgWidget` 添加到 `QMainWindow` 中:
```cpp
int main(int argc, char** argv)
{
QApplication app(argc, argv);
QMainWindow mainWindow;
// Create an OSG widget
OsgWidget* osgWidget = new OsgWidget(&mainWindow);
// Add the OSG widget to the main window
mainWindow.setCentralWidget(osgWidget);
mainWindow.show();
return app.exec();
}
```
通过以上步骤,就可以将 `osgViewer::Viewer` 嵌入到 `QOpenGLWidget` 中,并在 Qt 应用程序中显示 OSG 场景图了。
view = new QGraphicsView(ui->graphicsView); scene = new QGraphicsScene(ui->graphicsView); view->setViewportUpdateMode(QGraphicsView::NoViewportUpdate);为什么这个在主函数里不能屏蔽缩略图
这段代码创建了一个名为`view`的`QGraphicsView`对象,以及一个名为`scene`的`QGraphicsScene`对象,并将`scene`设置为`view`的场景。`view->setViewportUpdateMode(QGraphicsView::NoViewportUpdate)`将视口更新模式设置为`QGraphicsView::NoViewportUpdate`,这意味着视口不会自动更新,需要手动调用`viewport()->update()`或`update()`函数来更新视口。
如果您想要屏蔽缩略图,可以尝试将`view`的`setViewportUpdateMode`设置为`QGraphicsView::SmartViewportUpdate`或`QGraphicsView::FullViewportUpdate`。这样可以使视口自动更新并显示所需的图形。
另外,如果您希望完全禁用缩略图,请使用以下代码:
```
view->setViewportUpdateMode(QGraphicsView::NoViewportUpdate);
view->setOptimizationFlag(QGraphicsView::DontAdjustForAntialiasing, true);
view->setOptimizationFlag(QGraphicsView::DontSavePainterState, true);
view->setOptimizationFlag(QGraphicsView::DontAdjustForContents, true);
```
这将禁用所有优化标志,并完全禁用缩略图。
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