computercraft window api

--[[

hi, this is a temp script, for an upcomming api/os
this will give people the opportunity to make applications without direct contact to the events. (so no picking events from other applications)
also it's meant to support multithreading (or an simple form of it at least) and give you the opportunity to support multiple windows across your screen with mouse support

features implemented:
- function for handling the mouse_click event and give it to the most upfront window

features in dev:
- logging
- functions for focusing
- content drawing? thinking out a easy way to give as much freedom to the app while supporting as much as possible (non advanced computers?)

features planned:
- a single api call to register your window
- show/hide windows (enable/disable too)
- standard window buttons ([-][o][x][...??])
- make titleBox optional (with window buttons)

ALSO:
if you have some things you think could be improved please improve them end try to contact me

found out that if you make a public submit with the word 7Roses in it pastbin will notify me :)
or just pm me on the computercraft.info forum :) (recommend this communication)



]]

--when a click event occurs the os will first try to find the current highest window
--afther that it will give the action though to the windowhandler of that program

emptyWindow = {xstart,ystart,xend,yend,depth,drawn,windowhandlerMethod,content}
emptyWindow = {xstart = 0,ystart=0,xend =0,yend=0,nil,mouseEventHandler=function showof() print("nothing")end,drawFunction=nil}



globalWindowTable = {}
startupPopup
-- globalWindowTable[uid] = ...
globalWindowTable["myWindowTag"] = startupPopoup
--click event handler
windows = {}
function globalWindowHandler()
  while (true) do
    event, button, xPos, yPos = os.pullEvent("mouse_click")
    currentWindow = nil
    currentDepth = -32000
    for k,v in pairs(globalWindowTable) do
      if (v[xstart]<xPos && v[xend]>xPos && v[ystart]<yPos && v[yend]>yPos && v.depth>currentDepth) then
        currentWindow = v
        currentDepth = v.depth
    end
    if (currentWindow.mouseEventHandler != nil) then
      currentWindow.mouseEventHandler(button,xPos,yPos)
    else
      print("your application didn't register an mouse even handler!")
    end
  end
end



--[[

a window is focussed when the global depth is equal to the windows depth
when a window uses windows.focus(uid_window) and the current window wasn't focus, every window with a depth high than the calling window will be decreased with 1, and the calling window will be set to the top window+1

]]
function windows.focus(uid)
  if (globalCurrentFocusedWindow != uid) then
    globalCurrentFocusedWindow = uid
    maxdepth = -32000
    for k,v in pairs(globalWindowTable) do
      if (v.depth>-32000) then
        v.depth = v.depth-1
      else
        print("your program has probably a problem with focussing!")
      end
      if(v.depth>maxdepth) then
        maxdepth = v.depth
      end
    end
    globalWindowTable[uid].depth = maxdepth+1
  end
end