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Thumb widgets: apply thumb-tracking to enhance capabilities of multi-touch on mobile devices

While multi-touch design allows natural and flexible figure gestures in interacting with mobile devices, the palm-size screen often limits its potential in application and arouses issues such as inefficient mode switch and incomplete gesture. To enrich the vocabulary of finger gestures in user interaction, we present Thumb Widgets, a mechanism that adopts thumb as assisted input channel to enhance the capabilities of multi-touch on touch-based mobile devices. Thumb Widgets expand the design space in gesture-based UIs and promote efficiency for tasks such as mode switching, parameter setting, etc. Also, Thumb Widgets enable incomplete gestures to be performed around the periphery of the device.