通过一个空的QWidget设置SizePolicy来代替QSpacerItem
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| QWidget* spacer = new QWidget();
spacer->setSizePolicy(QSizePolicy::Expanding, SizePolicy::Expanding);
auto tb = new QToolBar;
...
tb->addAction(...);
...
tb->addWidget(spacer);
...
tb->addAction(...);
...
|