Description
If enabled, this event is reported when the user presses one of the mouse buttons. The event message reported as the result of ⎕DQ, or supplied as the right argument to your callback function, is a 6-element vector as follows :
| [1] | Object | ref or character vector |
| [2] | Event | 'MouseDown' or 1 |
| [3] | Y | y-position of mouse (number) |
| [4] | X | x-position of mouse (number) |
| [5] | Button | button pressed (number) 1 = left button 2 = right button 4 = middle button |
| [6] | Shift State | sum of shift key codes (number) 1 = Shift key is down 2 = Ctrl key is down |
If you enable this event it is advisable that you ALSO enable MouseUp events. Otherwise, the slight delay in running your callback function will cause the down and up sequence to be reversed.
In a graphical object (Circle, Ellipse, Image, Marker, Poly and Rect), the position of the mouse is reported relative to the top-left corner of its bounding rectangle.