Slider behaviour v2.2

 

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Slider behavior

property backSprite, direction, Update , minimum, maximum, margin, cursorMember property lowBorder, highBorder, scale, range, currentValue, start, lok, numberFormat, handlerName, backList on getBehaviorDescription     return "Slider behaviour, by Mark Hagers." & return & "Version 2.2, december 10, 1997." & return & "© 1997 Mediaeval Multimedia" & return & "email: mark@mediaeval.nl" & return & "Additions: 12/10/97: fixed cursorlist to allow unnamed cursor members." & return & "12/10/97: bug fix, non-zero minimum values now work properly." & return & "Behaviour for a slider sprite. Does it all !!" & return & "This behaviour must be assigned to the moving part of the slider. The behaviour also needs a background sprite, the 'scale' of the slider." & return & "Parameters for this behaviour:" & return & " - Orientation: you can have a horizontal or a vertical slider." & return & " - Back sprite: Sprite number of the slider's background (scale)." & return & " - Margin: constrain movement to within this number of pixels away from the background borders" & return & "   just experiment and see what happens." & return & " - Numberformat: let the value controlled by the slider be an integer or a floating point value." & return & "   With numberFormat 'integer' the slider will snap to an integer value when it is updated." & return & " - Minimum and maximum slider values, these values display as floats in the parameter dialog," & return & "   regardless of the numberFormat setting." & return & "   The Minimum value can be higher than the Maximum value for a 'reversed' slider." & return & "   This feature should now work correctly as of version 2." & return & " - Callback handler: you can put any valid Lingo command or handler here," & return & "   it will be executed whenever the slider is updated (see 'Updating' below)," & return & "   the slider value will be passed as a parameter to the command," & return & "   try 'put' and look at the message box to experiment." & return & " - Updating: update slider value on mouseup only (when the slider is released) or continuous (while dragging the slider)." & return & "   Combining 'Continuous' with the numberFormat 'integer' will cause the slider to 'snap' to integer values." end getBehaviorDescription on getPropertyDescriptionList   set description = [:]      set directionDef = #Horizontal      if the currentspritenum = 1 then     alert "this behavior will not work on sprite channels below 2"     exit   else     set backDef = max(1,the currentspritenum - 1)     set backList = []     repeat with i = 1 to backDef       if the memberNum of sprite i > 0 then add backList,i     end repeat     if count(backList) > 0 then       set backDef = getLast(backList)     else set backList = [1]     set cursorList = [#none]     repeat with i = 1 to the number of members       if the type of member i = #bitmap then         if the depth of member i = 1 then           if the name of member i <> "" then             add cursorList, the name of member i           else add cursorList, member i         end if       end if     end repeat     set cursDef = #none   end if      addProp description, #direction, ¬             [#default:directionDef,#format:#symbol,#comment:"Orientation:",#range:[#Horizontal,#Vertical]]      addProp description, #backSprite, ¬             [#default:backDef,#format:#integer,#comment:"Back Sprite:",#range:backList]      addProp description, #margin, ¬             [#default:0,#format:#integer,#comment:"Margin:", #range:[#max:40,#min:-40]]      addprop description, #cursorMember,  ¬             [#default:cursDef,#format:#bitmap,#comment:"Cursor image:", #range:cursorList]      addProp description, #numberFormat, ¬             [#default:#integer,#format:#symbol,#comment:"Number format:",#range:[#integer,#float]]      addprop description, #minimum,  ¬             [#default:0,#format:#float,#comment:"Minimum Value:"]      addprop description, #maximum,  ¬             [#default:1,#format:#float,#comment:"Maximum Value:"]      addprop description, #handlerName,  ¬             [#default:"",#format:#string,#comment:"Callback handler:"]      addprop description, #Update,  ¬             [#default:#MouseUp,#format:#symbol,#comment:"Updating:",#range:[#Mouseup,#Continuous]]      return description end getPropertyDescriptionList -------- on beginSprite me   if the memberNum of sprite backSprite = 0 then     alert "Behaviour 'Marks Slider' on sprite" && the spriteNum of me & ":" & return & return & "You need a background sprite in a lower channel number for this behaviour to work properly."     exit   end if   case direction of     #horizontal:       set tempMargin = (the width of sprite (the spriteNum of me)) / 2         set tempMargin2 = (the width of sprite (the spriteNum of me)) - tempMargin       set lowBorder = tempMargin2 + margin + the left of sprite backSprite       set highBorder = - tempMargin - margin + the right of sprite backSprite     #vertical:       set tempMargin = (the height of sprite (the spriteNum of me)) / 2       set tempMargin2 = (the height of sprite (the spriteNum of me)) - tempMargin       set lowBorder = tempMargin + margin + the top of sprite backSprite       set highBorder = - tempMargin2 - margin + the bottom of sprite backSprite   end case   set range = highBorder - lowBorder   set scale = float(abs(maximum - minimum)) / float(range)     set lok = 0   set start = 0   set currentValue = minimum   if numberFormat = #integer then     showValue me, integer(currentValue)   else     showValue me, currentValue   end if   if not voidP(cursorMember) and cursorMember <> #none then setCursor me, true   return me end on mouseDown me   case direction of     #horizontal:       set lok = the locH of sprite (the SpriteNum of me)       set start = the mouseH     #vertical:       set lok = the locV of sprite (the SpriteNum of me)       set start = the mouseV   end case end mouseDown on prepareFrame me   if lok > 0 then     case direction of       #horizontal:         set hor = the mouseH         set screenVal = max(lowBorder,min(lok + hor - start,highBorder))           set the locH of sprite (the spriteNum of me) to screenVal         if Update = #continuous then doUpdate me, screenVal - lowBorder       #vertical:         set ver = the mouseV         set screenVal = max(lowBorder,min(lok + ver - start,highBorder))           set the locV of sprite (the spriteNum of me) to screenVal         if Update = #continuous then doUpdate me, highBorder - screenVal     end case   end if end exitFrame on mouseUpOutside me   endUpdate me end mouseUpOutside on mouseup me   endUpdate me end mouseup on endUpdate me   set lok = 0   set start = 0   case direction of     #horizontal:       doUpdate me, the locH of sprite (the spriteNum of me) - lowBorder     #vertical:       doUpdate me, highBorder - the locV of sprite (the spriteNum of me)   end case end endUpdate on doUpdate me, scrvalue   if minimum < maximum then     set currentValue = minimum + scrvalue * scale   else set currentValue = minimum - scrValue * scale   if numberFormat = #integer then set currentValue = integer(currentValue)   showValue me, currentValue   if handlerName <> "" then do handlerName && currentValue end on showValue me, theVal   if minimum < maximum then     set scrValue = (theVal - minimum) / scale       case direction of       #horizontal:         set the locH of sprite (the SpriteNum of me) to lowBorder + scrValue       #vertical:         set the locV of sprite (the SpriteNum of me) to highBorder - scrValue       end case   else     set scrValue = (theVal - maximum) / scale     case direction of       #horizontal:         set the locH of sprite (the SpriteNum of me) to highBorder - scrValue       #vertical:         set the locV of sprite (the SpriteNum of me) to lowBorder + scrValue     end case   end if end showValue on setCursor me, theVal   if theVal then     set theCurs = the number of member cursorMember     set theMask = the number of member(the name of member cursorMember & ".mask")     if theMask > 0 then       set the cursor of sprite (the spriteNum of me) = list(theCurs, theMask)     else set the cursor of sprite (the spriteNum of me) = list(theCurs)   else set the cursor of sprite (the spriteNum of me) = 0 end