EventHandler and keyboard events

*To*: mathgroup at smc.vnet.net*Subject*: [mg132365] EventHandler and keyboard events*From*: Fred Simons <f.h.simons at tue.nl>*Date*: Sat, 22 Feb 2014 03:05:13 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net

The following is a simple event handler: DynamicModule[{n=0}, Style[EventHandler[ Graphics[{Inset[Dynamic[n],{0,0}]}, ImageSize->100, Background->Yellow], { {"KeyDown","1"}:>(n=RandomInteger[{1,100}]), "KeyDown"->Null} ], ShowSelection->False]] It works only when we first click on the yellow square, thereby making the current selection inside the event expression. When the current selection is outside the yellow square, typing a 1 replaces the current selection by 1, as usual. My goal is to develop a DynamicModule such that pressing a key when the mouse is over the DynamicModule initiates some action, without first having to set the selection inside the DynamicModule. So in the above example I want to achieve that moving the mouse over the yellow square automatically sets the current selection within the yellow square. Can that be done in Mathematica? My feeling is that it must be possible. After all, the frontend is able to detect that the mouse is over a displayed expression, e.g. in the function Mouseover, and setting the current selection in a notebook is a frontend action as well. All thoughts are highly welcomed. Fred Simons Eindhoven University of Technology