| 主权项 |
1. A method of navigating a touchscreen computing device under software magnification, the method comprising the steps of:
communicatively accessing the operating system of the computing device, the computing device displaying a canvas scrollable by touch gestures invoked by an end user, the canvas having a larger area than can be presented within screen edges of the touchscreen in a single viewing instance without reducing a default magnification level of the canvas, wherein the canvas is subdivided into a first canvas view and a second canvas view, the first canvas view enclosed by a conceptual boundary; displaying the first canvas view within the screen edges; invoking a magnification feature wherein a portion of the first canvas view is further enlarged to the screen edges of the touchscreen, a viewable area within the first canvas view defined by a magnification viewport; panning across the first canvas view under a first magnification level until reaching the boundary of the first canvas view, the panning invoked by a first directional touchscreen gesture; and responsive to detecting additional canvas laying beyond the boundary in the same direction as a second directional touchscreen gesture, scrolling the canvas beyond the boundary, whereby the second canvas view is presented on the touchscreen through the magnification viewport at the first magnification level; wherein, within the magnification viewport, a first directional gesture having a first quantity of digits in contact with the touchscreen scrolls the first canvas view up to the boundary but does not scroll the canvas into the second canvas view, while the second directional gesture having a second quantity of digits different from the first quantity of digits in contact with the touchscreen scrolls the canvas across the boundary while maintaining a constant magnification level within the magnification viewport. |
