PAN AND SELECTION GESTURE DETECTION

摘要

A user interface that has a canvas that is extendable in an extendable dimension and on which multiple selectable elements may be placed. In this context, when a selecting control is associated with a particular selectable element, and further user gestures are provided, a pan detection mechanism is configured to distinguish between an intent to pan the canvas and an intent to select the particular selectable element. When a selecting control is associated with a particular orthogonally scrollable element, the pan detection mechanism may be distinguish between an intent to pan the canvas and an intent to scroll the orthogonally scrollable element in a direction perpendicular to the extendible dimension of the canvas.