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Additional resources for ACM transactions on computer-human interaction (March)
An advantage of using the bezel touch sensor to engage scrolling is that the sensor has a large surface area and does not require muscle tension to maintain contact. However, we found that users sometimes touch it by mistake, particularly when holding the device in the other display orientations; providing four touch sensors, one for each edge of the screen bezel (but ignoring three of them, depending on the display orientation) may offer a solution to this difficulty. The Rock’n’Scroll device [Bartlett 2000] uses scrolling as the default mode, allowing scrolling without any explicit clutching mechanism to provide “start” and “stop” signals.
This can occur when the user puts down the device, or uses the device while resting it flat in his lap. For example, with our initial designs, we found that while putting down the device, the user may inadvertently tilt it and change the display format, forcing the user to sometimes pick up the device again, change the orientation, and put it down more carefully. To address this problem, our current design uses the tilt sensors to monitor whether the device is moving significantly. The system does not allow the display format to change until a short timeout after the device stops Moving.
L9. Explicitly encode ground transitions. Sensing systems should recognize and explicitly encode transitions between foreground and background and use such encodings to minimize disruptive changes to the current mode of interaction. For example, our experiences with integrating the foreground TiltScroll technique and the background Portrait/Landscape Switching technique suggest that a mechanism is needed to prevent cross-talk between the techniques. Our system addresses this cross-talk problem by implementing a new event architecture that provides policies and mechanisms for applications to request and monitor transitions between the grounds, as discussed in the following section.