qt 在 showEvent() 上隐藏控件
我在窗口上调用 show() ，它有几个控件，并且所有控件都会显示。
其中一个控件是继承自QFrame 的自定义控件。
如果设置了特定标志，我想隐藏此控件。所以，我有
void MyCustomControl::showEvent ( QShowEvent * /* evt */ )
{
if (!m_visibleAllowed)
hide();
}
虽然这隐藏了控件，但它使控件变得愚蠢；它看起来冻结了。当调整窗口大小时，控件所在的区域不会刷新。在论坛中搜索，我得到的想法是隐藏控件不应该在 showEvent() 上完成，这是真的吗？如果是这样，那么我应该如何/在哪里尝试隐藏控件。如果可以从 showEvent() 隐藏控件，我怎样才能防止控件被冻结。
谢谢你的时间。
I call show() on a window and it has several controls and all controls are displayed.
One of the controls is a custom control that inherits from QFrame.
I want to hide this control if a particular flag is set. So, I have
void MyCustomControl::showEvent ( QShowEvent * /* evt */ )
{
if (!m_visibleAllowed)
hide();
}
While this hides the control, it makes the control goofy; it looks frozen. When the window is resized, the area where the control is supposed to be does not get refreshed. Searching around forums, the idea that I get is that hiding the control is not supposed to be done on showEvent() is that true? if so then how/where should I try to hide the control. If hiding the control from showEvent() is possible, how can I prevent the control getting frozen.
Thanks for you time.
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如果问题出在您的 show 事件期间调用 hide() （我无法确认它是否被明确禁止，但这听起来不是一个好主意），并且从您的 show 事件中调用 hide 是您真正需要的地方有了这段代码，您就可以使用单次计时器：
它将简单地将
hide()函数的执行推迟到下一轮事件循环。If the problem is with calling hide() during your show event (I can't confirm that it's explicitly disallowed, but it doesn't sound like a good idea in general) and calling hide from your show event is where you really need to have this code then you could use a single shot timer:
which will simply defer the execution of the
hide()function until the next round of the event loop.也许您可以使用 QStackedLayout 或 QStackedWidget 堆栈中有两个小部件：您的控件和一个“空白”QWidget。如果您这样做，则无需在控件上使用 show() 和 hide()，而是切换堆栈顶部的内容。
这样你就永远不会尝试渲染隐藏的小部件 - 如果你的控件不可见，你会渲染空白的 QWidget - 我怀疑这会解决你的图形故障。
希望这有帮助！
Maybe you could use a QStackedLayout or a QStackedWidget that has two widgets in the stack: your control, and a "blank" QWidget. If you did that, instead of using show() and hide() on your control, you switch what's on top of the stack.
That way you never try to render a hidden widget - if your control isn't visible, you render the blank QWidget instead - and I suspect this will solve your graphics glitches.
Hope this helps!