Can't remove files or create directories?
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This must just be me being stupid, but if I create a new non-qt C++ project, I can't delete the remove the default main.cpp from the project! The option is greyed out on the right-click menu.
I can add new files ok, but I want to organize them into subfolders (my project will have several targets and I want to keep it neat). How do I create a folder? There's a "create new subproject" option in the right-click menu, but that's greyed out. If I try adding a new file to the project I can use the file dialog to create a folder on the filesystem and put the file in that, but it's not shown in the tree view!
What am I doing wrong? I'm on os x 10.7. I get the same results in creator 2.5 and 2.6
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Short answer: you can't.
Simplest way is most likely to just edit the .pro-file and to create the directory manually.
Project view shows the structure of the project files. "Folders" there are not necessarily found in the filesystem. A subproject is just a .pro-file that gets referenced in its parent .pro-file.
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Whether Creator can add/remove files depends a lot on the build system you use: We can do that on qmake, but for cmake and others that is basically impossible to do correctly. So maybe you are just using the "wrong" build system for those operations.
I don't have enough information to provide a definitive answer, sorry.