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- Do you really need a custom widget? Check whether an existing widget cannot be used instead.
- It is strongly recommended to consult the usability team (https://git.reviewboard.kde.org/groups/usability/) and the accessibility team (https://git.reviewboard.kde.org/groups/kdeaccessibility/) in advance of your implementation.
- Create interaction by following natural design. Find the appropriate metaphor and create interface as near to real usage as possible.
- Make sure your new widget:
- Resizes correctly
- Handles right-to-left setups
- Supports keyboard navigation (receives and gives focus, indicates when it is focused)
- Works well with different color schemes
- Looks as close to existing Qt or kdelibs widgets as possible (use QStyle or QStylePainter to draw elements).
- Is based on an existing widget rather than a plain QWidget if possible
- If possible, consider making your widget reusable enough so that it can be integrated in standard widgets