Editing Pointing device (section)

== Buxton's Three-State-Model ==
This model describes different states that a pointing device can assume. The three common states as described by Buxton are ''out of range, tracking and dragging''. Not every pointing device can switch to all states.<ref>{{cite web |first=William A.S. |last=BUXTON| title=A THREE-STATE MODEL OF GRAPHICAL INPUT | website=Dynamic Graphics Project {{!}} Computer Science, University of Toronto | url=https://www.dgp.toronto.edu/OTP/papers/bill.buxton/3state.html |year=1990}}</ref>

{| border="1" style="border-collapse:collapse"
 ! Model
 ! Explanation
|-
 | {{center|'''2 State Transaction'''}}
[[File:Tsm mouse svg.svg|250px]]
 | A mouse is moved without the button being pushed. This state can be called ''tracking'', meaning the user just moves the mouse without further interacting with the system. If the mouse is pointed at an icon and the button is pressed while moving the mouse, a new state called ''dragging'' is entered. These states are shown in the image ''"2 State Transaction"''.
|-
 | {{center|'''Out of Range & Tracking'''}}
[[File:Tsm touch svg.svg|250px]]
 | If a touch tablet, which is able to sense touch or no-touch, is used instead of a mouse, the state model looks different. More precisely this means that any movement of the finger off the display is ''out of range'' and has no effect on the system. Only when the finger touches the display, the state switches to ''tracking'' (Figure: ''"Out of Range & Tracking"''). 
|-
 | {{center|'''Out of Range, Tracking & Dragging'''}}
[[File:Tsm stylus svg.svg|250px]]
 | If a graphics tablet with a stylus is used, it is possible to sense all three states. When the stylus is lifted, it is ''out of range''. When it is in range, the state switches to ''tracking'' and the pointer follows the stylus' movement. Performing extra pressure on the stylus initiates state 2 ''dragging'' (Figure: ''"Out of Range, Tracking & Dragging"'').
|- 
 | {{center|'''State 2 Set'''}}
[[File:Tsm multiple svg.svg|250px]]
 | By using a multiple-button mouse or multiple clicks, State 2 can be split into a set of states, i.e. pressing different buttons leads to different states. For example, selecting an object with ''Button 1'' switches to the state ''Drag Original'' whereas ''Button 2'' switches to ''Drag Copy''. The same goes for multiple clicks known from [[Windows]]: one click on an object selects an object, double-clicks open it (Figure: ''"State 2 Set"'').
|}