w_dlist

Display list to add to.

l_point1 and l_point2

The lower-left and upper-right coordinates of a box, within which the SkillObject will draw. The display list processing functions use this box to determine the visibility of the SkillObject. The procedure you write to define the SkillObject must be written to draw and then return as quickly as possible. If not, the performance of the system will suffer.

t_procName

SKILL function to call.

The t_procName procedure is called in the following manner:

t_procName( l_point1 l_point2 s_eventType t_eventDetail t_procArgs)

s_eventType is one of the following symbols:

draw (the display list is drawing)

button1 (the left mouse button was pressed)

button2 (the middle mouse button was pressed)

button3 (the right mouse button was pressed)

key (a key was pressed)

In the case of the key eventType, the t_eventDetail tells you which key was pressed. Otherwise, the eventDetail argument is nil.

t_procArgs

Arguments passed to the function.

t_highlightMode

When the user enters into an event object, you can specify the system to draw a box around the sensitive area, or invert the sensitive area, or to do nothing. These are specified by box (or b), invert (or i), or none. The default value is none.

g_doesGraphics

Tells the display list processing functions whether you use dlDraw functions inside your SKILL procedure or not. dlDraw functions are discussed later on. If you don’t call dlDraw functions, the rendering of your display list will be faster. This argument should be t or nil.

s_tagSymbol

Symbol to tag this object with.

t

Operation successful.

nil

Operation failed.