[closed] What is the component name of...
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That would be a sub-class of "QTabWidget":http://qt-project.org/doc/qt-4.8/QTabWidget.html .... I don't think there is a direct component which would give the looks as in QtCreator but you can can make the tabs appear on the left side by using the "TabPosition Enum":http://qt-project.org/doc/qt-4.8/qtabwidget.html#TabPosition-enum in the QTabWidget... For better looks, you will need to sub-class and reimplement lots of stuff...
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The name of it is "FancyTabBar", which is a subclass of QWidget.