问题
Does anyone know if it is possible to use drag and drop with a tray icon using Qt?
回答1:
I've been doing some research and here is what I have come up with:
A QSystemTrayIcon cannot explicitly handle a drag/drop event. However there is a workaround based on the Spifftastic tray icon location method.
- You create a uniquely colored icon and place it as the icon for a brief moment and take a screenshot of it.
- Given that you know the color sequence for the icon, you can search through the screenshot and locate the particular icon's location.
- A transparent widget is positioned over the icon and is used as the drop target.
I have yet to work at a few of the finer details of the operation but that is the gist of it. All things considered it is a hacky way of things but given that there are no other ways to do this I think it is acceptable.
Fluffy App (written in C#) uses the Spifftastic method to locate the tray icon. I'm assuming the part about the transparent window is how they accomplish that but I have yet to decompile and examine their system.
回答2:
Since QSystemTrayIcon is a QObject, not a QWidget, my guess is this is not possible. The system tray icon isn't really owned by Qt - it's passed on to the 'desktop', i.e whatever part of the Gnome/KDE/Windows/Mac is drawing the relevant area. At least on Mac, you'd be dropping on the menu-bar, which would be a very strange UI. For Gnome and KDE it's a FreeDesktop.org standard, but again I don't think its your process which actually does the drawing, and hence there's no way for Qt to get events such as drag and drop to you.
来源：https://stackoverflow.com/questions/4011348/qt-tray-icon-drag-and-drop