如何在 Qt 中为无框窗口添加阴影 [英] How to put a shadow to a Frameless window in Qt

问题描述

我正在尝试创建一个下面有阴影的无边框窗口.当我们创建一个带有 Qt::FramelessWindowHint 标志的无边框窗口时，它不包含阴影.但是我们可以通过创建一个 QGraphicsDropShadowEffect 对象，然后通过 setGraphicsEffect 函数将其传递给小部件，从而轻松地为子部件添加阴影.但这似乎不适用于 QMainWindow.请帮我在 Qt 中为无框窗口添加阴影...

I'm trying to create a Frameless window that has a shadow under it.When we create a borderless window with Qt::FramelessWindowHint flag it doesn't contain a shadow. But we can put shadows to a child widgets easy by creating a QGraphicsDropShadowEffect object and then pass it to the widget through setGraphicsEffect function. But this doesn't seem to work for QMainWindow. Please help me to put shadow to a frameless window in Qt...

推荐答案

你可以使用这个简单的 hack 来做到:

You can do it using this simple hack:

将QWidget"(比如小部件)添加到 MainWindow 并将 MainWindow 上的所有内容移动到小部件.然后这样做:

Add a "QWidget" (say widget) to the MainWindow and move everything that's on the MainWindow to the widget. Then do this:

setAttribute(Qt::WA_TranslucentBackground); //enable MainWindow to be transparent

QGraphicsDropShadowEffect* effect = new QGraphicsDropShadowEffect();
effect->setBlurRadius(5);
ui->widget->setGraphicsEffect(effect);

这似乎对我有用.见:

This seems to work for me. See:

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