Python 刷新 QWidget

Refreshing a QWidget

提问by Olivier Giniaux

I've been having this issue a lot of times.

我已经遇到这个问题很多次了。

When I modify some properties of a QWidgetafter the widget.show(), the widget won't update. Most of the time, a mouse click or when the mouse leaves or enters the widget, the widget will be updated. However, if I leave the mouse, it won't refresh by itself.

当我在QWidget之后修改 a 的某些属性时widget.show()，小部件不会更新。大多数情况下，鼠标单击或鼠标离开或进入小部件时，小部件都会更新。但是，如果我离开鼠标，它不会自行刷新。

Until now I managed to deal with this by doing :

到目前为止，我设法通过执行以下操作来处理此问题：

widget.hide()
widget.show()

But this is a very dirty fix. Is there a better way to tell pythonto refresh the widget ?

但这是一个非常肮脏的修复。有没有更好的方法来告诉python刷新小部件？

Thank you.

谢谢你。

采纳答案by Kosovan

To update the widget, you should repaint()it, but calling repaint()directly is not very good, so try:

要更新widget，你应该repaint()这样做，但是repaint()直接调用不是很好，所以尝试：

widget.update()

From doc:

来自文档：

This function does not cause an immediate repaint; instead it schedules a paint event for processing when Qt returns to the main event loop. This permits Qt to optimize for more speed and less flicker than a call to repaint() does.

Calling update() several times normally results in just one paintEvent() call.

Qt normally erases the widget's area before the paintEvent() call. If the Qt::WA_OpaquePaintEvent widget attribute is set, the widget is responsible for painting all its pixels with an opaque color.

此函数不会立即重新绘制；相反，它会在 Qt 返回到主事件循环时安排一个绘制事件进行处理。与调用 repaint() 相比，这允许 Qt 进行优化以获得更高的速度和更少的闪烁。

多次调用 update() 通常只会导致一次 paintEvent() 调用。

Qt 通常在paintEvent() 调用之前擦除小部件的区域。如果设置了 Qt::WA_OpaquePaintEvent 小部件属性，则小部件负责用不透明颜色绘制其所有像素。

回答by Bharadwaj

Did you already try the QWidget.update()

您是否已经尝试过 QWidget.update()

This function updates only the visible parts keeping the invisible parts untouched.

此功能仅更新可见部分，不影响不可见部分。