Qt5.4 QDialog窗体圆角时圆角透明背景是黑色的解决方法

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我是靠谱客的博主虚拟板凳，最近开发中收集的这篇文章主要介绍Qt5.4 QDialog窗体圆角时圆角透明背景是黑色的解决方法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

运行环境：framebuffer、armlinux系统、qt5.4
设置这两句
setAttribute(Qt::WA_TranslucentBackground);
setWindowFlags(Qt::FramelessWindowHint);

//通过这个接口可以发现

void MissionMark::PrintWindowFlags()
{
QString text;
Qt::WindowFlags flags = this->windowFlags();
Qt::WindowFlags type = ( flags & Qt::WindowType_Mask);
if (type == Qt::Window) {
text = "Qt::Window";
} else if (type == Qt::Dialog) {
text = "Qt::Dialog";
} else if (type == Qt::Widget) {
text = "Qt::Widget";
} else if (type == Qt::ForeignWindow) {
text = "Qt::ForeignWindow";
} else if (type == Qt::SubWindow) {
text = "Qt::SubWindow";
} else if (type == Qt::CoverWindow) {
text = "Qt::CoverWindow";
} else if (type == Qt::Desktop) {
text = "Qt::Desktop";
} else if (type == Qt::Sheet) {
text = "Qt::Sheet";
} else if (type == Qt::Drawer) {
text = "Qt::Drawer";
} else if (type == Qt::Popup) {
text = "Qt::Popup";
} else if (type == Qt::Tool) {
text = "Qt::Tool";
} else if (type == Qt::ToolTip) {
text = "Qt::ToolTip";
} else if (type == Qt::SplashScreen) {
text = "Qt::SplashScreen";
}
if (flags & Qt::MSWindowsFixedSizeDialogHint)
text += "n| Qt::MSWindowsFixedSizeDialogHint";
if (flags & Qt::X11BypassWindowManagerHint)
text += "n| Qt::X11BypassWindowManagerHint";
if (flags & Qt::FramelessWindowHint)
text += "n| Qt::FramelessWindowHint";
if (flags & Qt::NoDropShadowWindowHint)
text += "n| Qt::NoDropShadowWindowHint";
if (flags & Qt::WindowTitleHint)
text += "n| Qt::WindowTitleHint";
if (flags & Qt::WindowSystemMenuHint)
text += "n| Qt::WindowSystemMenuHint";
if (flags & Qt::WindowMinimizeButtonHint)
text += "n| Qt::WindowMinimizeButtonHint";
if (flags & Qt::WindowMaximizeButtonHint)
text += "n| Qt::WindowMaximizeButtonHint";
if (flags & Qt::WindowCloseButtonHint)
text += "n| Qt::WindowCloseButtonHint";
if (flags & Qt::WindowContextHelpButtonHint)
text += "n| Qt::WindowContextHelpButtonHint";
if (flags & Qt::WindowShadeButtonHint)
text += "n| Qt::WindowShadeButtonHint";
if (flags & Qt::WindowStaysOnTopHint)
text += "n| Qt::WindowStaysOnTopHint";
if (flags & Qt::CustomizeWindowHint)
text += "n| Qt::CustomizeWindowHint";
if (flags & Qt::MSWindowsOwnDC)
text += "n| Qt::MSWindowsOwnDC";
if (flags & Qt::WindowMinMaxButtonsHint)
text += "n| Qt::WindowMinMaxButtonsHint";
if (flags & Qt::MacWindowToolBarButtonHint)
text += "n| Qt::MacWindowToolBarButtonHint";
if (flags & Qt::BypassGraphicsProxyWidget)
text += "n| Qt::BypassGraphicsProxyWidget";
if (flags & Qt::WindowStaysOnBottomHint)
text += "n| Qt::WindowStaysOnBottomHint";
if (flags & Qt::WindowFullscreenButtonHint)
text += "n| Qt::WindowFullscreenButtonHint";
if (flags & Qt::WindowOkButtonHint)
text += "n| Qt::WindowOkButtonHint";
if (flags & Qt::WindowCancelButtonHint)
text += "n| Qt::WindowCancelButtonHint";
if (flags & Qt::WindowTransparentForInput)
text += "n| Qt::WindowTransparentForInput";
if (flags & Qt::WindowDoesNotAcceptFocus)
text += "n| Qt::WindowDoesNotAcceptFocus";
if (flags & Qt::WindowOverridesSystemGestures)
text += "n| Qt::WindowOverridesSystemGestures";
qDebug()<<text;
}

设置 setWindowFlags(Qt::FramelessWindowHint)之前QDialog的windowFLags；

“Qt::Dialog
| Qt::WindowTitleHint
| Qt::WindowSystemMenuHint
| Qt::WindowCloseButtonHint
| Qt::WindowContextHelpButtonHint”

设置后
“Qt::Widget
| Qt::FramelessWindowHint”

可见它是把他当成了QWidget来处理的，所以这个地方会造成QDialog的Qt::ApplicationModal阻塞失效，并且也没有置顶了。

延伸资料：关于Qt如何保持子窗口显示在最上面的两种方式