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== Simultaneous 2D-scrolling == Special scroll-bar like graphical control elements allow panning around a two-dimensional space by simply moving a single rectangle in any direction on the plane. For example, the GtkScrollpane from [[GTK+]] is implemented in the text viewers gv and [[ghostview]]. Another example for simultaneous two-dimensional scrolling is an alignment program for protein sequences.<ref>[http://3d-alignment.eu/ 3d-alignment.eu]</ref> Initially, the horizontal scroll-bar looks like a conventional one. But then the scroll-bar offers three additional features: # It provides an overview of the entire scene. # The height can be enlarged. # The knob can not only be moved left and right but also up and down for vertical scrolling. In [[RISC OS]] dragging a scrollbar with the left mouse button operates in the usual way, but dragging with the right button causes the pointer to disappear and both scrollbars to be manipulated simultaneously. Many GUI operations in RISC OS perform a related but slightly different function when right clicked.
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