C++ over Qt:控制标签和按钮的透明度

问题描述

好吧，我再次尝试使用 Qt Creator 上的 Linux GUI 应用程序，我在我的项目的 Qt 资源文件中添加了几个图像.我试图在我的主窗口和其他窗口和对话框中拥有一个漂亮的背景.我使用的是样式表选项(无编码).

Well, I was again trying my hands on a Linux GUI app on Qt Creator, I added couple of images in a Qt resource file of my project. And I tried to have a nice background in my main window and other windows and dialogs. I was using from the stylesheets option (no coding).

我无法设置标签和按钮的透明度级别.关于如何从 Qt Creator GUI 本身做到这一点的任何想法???
!我附上了我的应用程序外观的快照.

I am unable to set the transparency level of labels and pushbuttons. Any ideas on how to do it from Qt creator GUI itself ???
!I am attaching a snap of how my application looks.

推荐答案

可以通过设置样式表来设置QLabel或者QPushbutton的透明度:

You can set transparency of QLabel or QPushbutton by setting the stylesheet :

ui->label->setStyleSheet("background-color: rgba(255, 255, 255, 0);");
ui->button->setStyleSheet("background-color: rgba(255, 255, 255, 0);");

您还可以在设计器中将 background-color: rgba(255, 255, 255, 0); 添加到小部件的 styleSheet 属性中.

You can also add background-color: rgba(255, 255, 255, 0); to the styleSheet property of the widget in the designer.

第四个参数是 alpha.您还可以通过将 alpha 设置为大于零的某个值来拥有半透明小部件:

The fourth parameter is alpha. You can also have semi-transparent widgets by setting alpha to some value more than zero :

ui->button->setStyleSheet("background-color: rgba(255, 255, 255, 50);");

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