[Dwarf Fortress] Fleeting Frames' gui/indicator_screen 1.1

local helptext = [=[
indicator_screen
================
Module containing getScreen & isWideView functions, to be
called with dfhack.script_environment(gui/indicator_screen)
                        version 1.1
  getScreen arguments:
1: A table with 1 to N tables ([] values being optional) of
  {text[, color][,onclick ][, onrclick][, notEndOfLine]
  [, onhovertext][, onhoverfunction]},
  where text is text or function that returns text, color is
  number/pen or function that returns it, onclick and onrclick
  are functions to be called when the text is (right-)clicked,
  notEndOfLine being true continues next text on same line,
  onhovertext being a table with text and color used on hover,
  and onhoverfunction is function called on hover. Table can
  be changed after creation, and color/onclick/onrclick
  /onhoverfunction can also be applied to whole table.

2: Optional table that optionally contains x, y, width and
  height for text display. Places the text by upper left
  corner at x,y. Calculates height and width from 1 if not set.

3: Optional table like the above for frame boundary.
  If width or height are not set, uses DF's height and width.
  If left out, then frame boundary is not drawn.

Returns a gui.FramedScreen element with additional functions:
  adjustDims(affectsText,x,y,w,h) - meant for resizing
  onHelp() - dismisses the screen
  removeFromView([dissmiss_when]) - [dismisses in n ticks]
  inheritBindings()
  clearBindings()
  onDestroy()
  onGetSelectedJob()
  onGetSelectedUnit()
  onInput(keys)
  onRenderBody()
  onRenderFrame()
  onResize()
  onShow()
  setRects(textrect, framerect)

And public values affecting behaviour:
  signature: false will not paint, nil will use light gray
  signature_text: Text used as signature if there's no frame
  binding_inherit: valid values "hook", "keybinding", "none".
  dismiss_on_zoom: nil will dismiss parent and adopt grandpa
  dismiss_ordered: used to dismiss screen on viewscreen change.
  nonblinky_dismiss: default evaluates by fps/gfps>1+#screens.
  onStateChangeKey: dfhack.onStateChange function key for ^.
  indicator_screen_version: numerical value of current version.]=]

indicator_screen_version = 1.1

local gui = require 'gui'

function isWideView()
    -- Tells if one has tabbed the view mode to wide or not with true or false.
    -- In other cases, such as not even thin, returns nil.
    local map_width = df.global.ui_area_map_width
    local menu_width = df.global.ui_menu_width
    if map_width == 3 and menu_width == 1 then
        return true
    elseif map_width == 2 and
    (menu_width == 1 or
        (--[==[dfhack.screen.readTile((df.global.gps.dimx-56),2).ch == 219 and--]==]--
            -- To check the case where menu should be gone but active sidebar keeps it visible
            -- Deprecated: Introduces lag.
        (not dfhack.gui.getCurFocus():find("dwarfmode/Default")) and
            -- To prevent failing on Trade depots in NE corner, though a rogue screen could override this.
        menu_width == 2)
        ) --or (
        --(not dfhack.gui.getCurFocus():find("dwarfmode/Default"))
        --and map_width == 3 and menu_width == 3 )
        then
        return true
    elseif (map_width == 3 and menu_width == 3 and dfhack.gui.getCurFocus():find("dwarfmode/Default") ) or (
           map_width == 2 and menu_width == 2 ) then
        return nil
    else
        return false
    end
end


function getScreen(dynamic_text_table, simpleTextRect, simpleFrameRect)
--[[ :dynamic_text_table: a {} with 1..n iterated integer keys
                            each points to {text = valueA, color = valueB}
                            values can be functions
     :simpleTextRect: an optional {} with optional x, y, width, height number values
                        if not set, uses window dimensions
     :simpleFrameRect: like simpleTextRect
                        if not set, only places signature on closest vanilla frame border.

    Returns not yet shown screen
]]--

function getLongestLength (ltable, lkey)
    -- Single-Utility function, returns longest length of a given key or notEndOfLine keychain in a table.
    -- Runs functions once to get the length of their answers.
  local len,clen = 0,0
  local twostring=tostring --function outside iterator
  for i=1, #ltable do
    if type(ltable[i][lkey]) == "function" then
        clen = clen + #((ltable[i][lkey])())

    else
        clen = clen + #(twostring(ltable[i][lkey])) --convert to string, in case it is a number
    end
    if ltable[i].notEndOfLine and i ~= #ltable then
        --doNothing, unless it is the last element
    elseif clen > len then
        len = clen
        clen = 0
    else
        clen = 0
    end
  end
  return len
end

function getHeight(ltable)
    --single-use utility function to get height of text used.
    local height = #ltable
    for i=1, #ltable do
        if i~= #ltable and ltable[i].notEndOfLine then
            height = height - 1
        end
    end
    return height
end

simpleTextRect = simpleTextRect or {}
--In case it is not specified, as all methods refer to a table.

local screen = gui.FramedScreen{
    frame_style = gui.BOUNDARY_FRAME, -- not necessary, but indicatoror will default anyway
    --frame_title = '', -- Adds clutter and is not useful for most inline indicators. Can be set later
    frame_width = simpleTextRect.width or getLongestLength(dynamic_text_table, "text"),
                --function, as lenghts shorter clip it away, while longer ones create unnecesary black space
    frame_height = simpleTextRect.height or getHeight(dynamic_text_table),
    frame_inset = simpleFrameRect and 1 or -1
}

simpleTextRect.width = simpleTextRect.width or screen.frame_body.width
simpleTextRect.height = simpleTextRect.height or screen.frame_body.height

local unused, nr = dfhack.gui.getCurFocus():gsub("dfhack","hack")
screen.nonblinky_dismiss = df.global.enabler.fps_per_gfps < (2+(nr or 0)) and true or false
unused, nr = nil, nil
    --Issue nbA: If one creates multiple screens at once and then later shows them at once, may blink.
    --But if one sets this value on show, then user will be unable to modify it if desired,
    --as the relevant necessary function to make it work is also called then and only then.
    --Issue nbB: Inaccurate if fps isn't capped (possible once this thing can unpause)
    --Issue nbC: if set to false, .dismiss_ordered does nothing.

screen.signature = true
-- only affects things if inset is -1
-- other options being nil (light gray on light gray) and false(not painted)

screen.binding_inherit = "hook"
--[[    Controls if and how the created screen will react to keybindings active in the context it is called
        Purpose is to provide better interaction with fourth party plugins and scripts

        Possible options are hook, hook_bottom, keybinding, none=nil=false

    none: doesn't look at the bindings set to viewscreen beneath, though focus path is set according to it.

    keybinding: Asks keybinding for all keybindings, and then adds binding in parent viewscreen to its context
                for as long as the screen is up. Doesn't always work even when it could, for scripts often check
                context they're called in before running.

    hook: Asks keybinding for all keybindings, and when it gets a combination applicable in parent screen removes
          itself as child from parent screen, calls the command with dfhack, waits a frame, and readds itself.
          After 1 frame, adds this screen back on top of topmost viewscreen.
    ]]--

screen.dismiss_on_zoom = true
    -- Controls whether screen is kept or dismissed on zooming or ascending (with Escape) out of a menu.
    -- Default is true, just as new vanilla screens are placed on top of created screens.
    -- False would mimic how binding_inherit hook results in this screen being placed on top of keybinded screen.
function createRect(inputRect)
--Takes nil or partial or complete table of x, y, width, height values
-- negative x,y will be wrapped
--Returns table with all location values screen uses.
    local simpleRect = inputRect or {}
    --Either use passed simple rectangle or create new one as big as screen.
    local newRect = {}
    newRect.width = simpleRect.width or df.global.gps.dimx
    newRect.height = simpleRect.height or df.global.gps.dimy
        --if values are missing, set them to full screen width

    newRect.x1 = simpleRect.x and (simpleRect.x > -1 and simpleRect.x or (df.global.gps.dimx+simpleRect.x)) or 0
    newRect.y1 = simpleRect.y and (simpleRect.y > -1 and simpleRect.y or (df.global.gps.dimy+simpleRect.y)) or 0
    --wrapping around the screen, and zeroes if not initialized
    newRect.x2=newRect.x1+newRect.width - 1
    newRect.y2=newRect.y1+newRect.height - 1
    newRect.clip_x1=newRect.x1
    newRect.clip_x2=newRect.x2
    newRect.clip_y1=newRect.y1
    newRect.clip_y2=newRect.y2
    newRect.x=newRect.x1
    newRect.y=newRect.y1
    newRect.hgap=newRect.height -- if both hgap and wgap are 0, it'll set the screen to black.
    newRect.wgap=newRect.width  -- that's a little undesirable loop if I'm creating, not dismissing
    if (newRect.hgap == 0) and (newRect.hgap == newRect.wgap) then newRect.hgap = 1 end
                                -- preventing it allows zero-size frames without blanking the screen.

    return newRect
end


function set_rect(target, corrector)
    -- sets all corrector key values found in targetrect to corrector ones
    -- This softness is useful for avoiding table bloat or modifying native userdata
    for key, value in pairs(corrector) do
        if target[key] then target[key] = value end
    end
end

textrect = createRect(simpleTextRect)
framerect = simpleFrameRect and createRect(simpleFrameRect) or false

    local zeroRect = {width = 0, height = 0, x = 0, y = 0} --Declared for setRects to prevent table proliferation
function screen:setRects(textrect, framerect)
    --sets screen's dimension values to given input rects
set_rect(self.frame_body, textrect)
if framerect then
    set_rect(self.frame_rect, framerect)
else
    set_rect(self.frame_rect, createRect(zeroRect))
    --Even without instructions for frame body, it is still set.
    --Also dfhack indicator depends on it existing somewhere, so can't just skip drawing frame.
end
end


    local inheritedbindings = {}
    local modifiertable = {}
        --(Static) table for all possible keybinding modifiers
    table.insert(modifiertable, "") --nothing too
    table.insert(modifiertable, "Ctrl-")
    table.insert(modifiertable, "Alt-")
    table.insert(modifiertable, "Shift-")
    table.insert(modifiertable, "Ctrl-Alt-")
    table.insert(modifiertable, "Ctrl-Shift-")
    table.insert(modifiertable, "Shift-Alt-")
    table.insert(modifiertable, "Ctrl-Alt-Shift")
function screen:inheritBindings()
    --Asks keybinding for all keybindings in parent context, and binds them to itself.
  if self.binding_inherit and not (self.binding_inherit:find("none")) then
local bindinglist = {}
local context = dfhack.gui.getFocusString(self._native.parent)

function insertAllKeymods(key, searched_context)
    --Takes a single key (e.g. K) and checks if it with any and all modifiers applies to searched context
    --If pplies, adds that to binding list
  for i = 1, #modifiertable do
    local keybinding_text = dfhack.run_command_silent("keybinding list " .. modifiertable[i] .. key)
      if not keybinding_text:find("No bindings") then --No bindings, ergo nothing to do
        for single_bind in keybinding_text:gmatch("%s%s[^%s].-\n") do --Split up the list and iterate it.
            local received_context = single_bind:match("@.-:")    --Ask what context given command uses
            if not received_context or --general, DF-wide context
                   searched_context:find(received_context:sub(2,-2)) then --context matches same or lower screen

                table.insert(bindinglist, modifiertable[i] .. key --modifier-key combination
                    .. (received_context and single_bind:sub(3,-2)--binding has context (matters for @_:)
                    or ("@_: " .. single_bind:sub(3,-2) )) .. '"')--binding doesn't have context+" at end.
            end
        end
      end
  end
end

for charCode = 65, 90 do --A to Z
  insertAllKeymods(string.char(charCode), context)
end
for i=0, 9 do            --0 to 9
    insertAllKeymods(tostring(i), context)
end
for i=0, 12 do            --F1 to F12
    insertAllKeymods("F" .. tostring(i), context)
end
insertAllKeymods("Enter", context) --Enter is only non-alpa(F)numeric key.

for index = 1, #bindinglist do
    local inheritedbinding =  bindinglist[index]
                                :gsub("\n",'"')
                                :gsub("@.-: ",
                                    ("@dfhack/lua/" .. self.focus_path .. (self.binding_inherit == "hook" and ' "gui/indicator_screen execute_hook ' or ' "')))
    table.insert(inheritedbindings, inheritedbinding)
    dfhack.run_command("keybinding add " .. inheritedbinding)
end
bindinglist = nil --cleanup

  end
end

function screen:clearBindings()
    --function to clear up previously added keybindings
  if self.binding_inherit and
  (self.binding_inherit == "keybinding" or self.binding_inherit == "hook") then
    for index = 1, #inheritedbindings do
        dfhack.run_command_silent("keybinding clear " .. inheritedbindings[index])
    end
  end
  inheritedbindings = {} --Bye old table, hello new table
end

function screen:onDestroy()
    --Screen is removed, so better clean up keybinding list.
    self:clearBindings()
    self._native = nil
        --Potentially dangerous technique that should reduce RAM usage due C not having any garbage collection.
    inheritedbindings = nil --no longer needed
end

-- Utility function
-- Due dynamic tree structure, don't know where desired viewscreen is? Retrieve it
function getBottomMostViewscreenWithFocus(text, targetscreen)
    --Finds and returns the screen closest to root screen whose path includes text
 if targetscreen and
    dfhack.gui.getFocusString(targetscreen):find(text) then
    return targetscreen
 elseif targetscreen and targetscreen.child then --Attempting to call nil.child will crash this
    return getBottomMostViewscreenWithFocus(text, targetscreen.child)
 end
 -- if there's no child, it didn't find a screen with text in focus and returns nil
end


-- Replacement for onGetSelectedUnit and onGetSelectedJob
-- Necessary for View unit, unitlist, joblist
local function onGetSelectedX(X)

    --View mode
    if getBottomMostViewscreenWithFocus("dwarfmode/ViewUnits/Some", df.global.gview.view.child) then
        if X == "units" then
            return df.global.world.units.active[df.global.ui_selected_unit]
        elseif X == "jobs" then
            return df.global.world.units.active[df.global.ui_selected_unit].job.current_job
        end
    end

    --Workshop mode
    local workshopscr = getBottomMostViewscreenWithFocus("QueryBuilding/Some/Workshop/Job", df.global.gview.view.child)
    if workshopscr then
        if X == "jobs" then
            return df.global.ui_sidebar_menus.workshop_job.choices_all[0].building    --workshop
                    .jobs[df.global.ui_workshop_job_cursor]    --currently selected job in workshop
        elseif X == "units" then
            local jobrefs=
                df.global.ui_sidebar_menus.workshop_job.choices_all[0].building    --workshop
                    .jobs[df.global.ui_workshop_job_cursor] --selected job
                        .general_refs
            for index, ref in pairs(jobrefs) do
                if ref._type == df.general_ref_unit_workerst then
                    return df.unit.find(ref.unit_id)
                end
            end
        end
    end

    --joblist, unitlistmode
    local joblist = getBottomMostViewscreenWithFocus("joblist",df.global.gview.view.child)
    local unitlist = getBottomMostViewscreenWithFocus("unitlist",df.global.gview.view.child)
    if joblist then
        if X == "units" then
            if joblist.jobs
                    [joblist.cursor_pos] then
            local jobrefs =
                joblist.jobs
                    [joblist.cursor_pos]
                        .general_refs
            for index, ref in pairs(jobrefs) do
                if ref._type == df.general_ref_unit_workerst then
                    return df.unit.find(ref.unit_id)
                end
            end
            else
                return joblist[X]
                    [joblist.cursor_pos]
            end
        end
        if X == "jobs" then
            return joblist[X]
                    [joblist.cursor_pos]
        end
    elseif unitlist then
        local whichlist
        if unitlist.page == 0 then
            whichlist = "Citizens"
        elseif unitlist.page == 1 then
            whichlist = "Livestock"
        elseif unitlist.page == 2 then
            whichlist = "Others"
        else
            whichlist = "Dead"    --dead taking our jobs. Say it ain't so!
        end

        return unitlist[X]
                [whichlist]
                    [unitlist.cursor_pos[whichlist]]
    end

end

local function setOnSelectedUnitJob(self)
    if  getBottomMostViewscreenWithFocus("joblist",df.global.gview.view.child) or
        getBottomMostViewscreenWithFocus("unitlist",df.global.gview.view.child) or
        getBottomMostViewscreenWithFocus("QueryBuilding/Some/Workshop/Job", df.global.gview.view.child) or
        getBottomMostViewscreenWithFocus("dwarfmode/ViewUnits/Some", df.global.gview.view.child) then
        self.onGetSelectedUnit = function() return onGetSelectedX("units") end
        self.onGetSelectedJob =  function() return onGetSelectedX("jobs") end
    end
end

function screen:onShow()
self.focus_path = "indicator_screen/" .. dfhack.gui.getFocusString(self._native.parent)
--Doesn't have a parent before showing
self:setRects(textrect, framerect)
self.dismiss_ordered = false
    --Lets not dismiss the screen the first time we look away, mkay.
if self.binding_inherit and
   (self.binding_inherit == "keybinding" or self.binding_inherit == "hook") then
    --If screen is set to inherit bindings, set the appropriate keybindings.
   self:inheritBindings()
end
    -- Additional gui functions, but only in contexts where they matter.
    -- Also checked/added in onInput
setOnSelectedUnitJob(self)

    -- low-FPS/GFPS ratio concerns.
    -- As it is, does ultimately nothing if screen.dismiss_ordered isn't modified later
    -- because all the pre-set dissmisses are already on viewscreen changes.
if self.nonblinky_dismiss then
self.onStateChangeKey = "indicator_screen_" .. tostring(self) .. "_nonblinky"
    --Unique, reproducible, maybe-useful key for onstateChange
    --Using self itself as key will prevent garbage collection and be not as understandable as "what's this"
function orderDismissOnScreenChange(code)
 if not self or not self:isActive() then
    --shenagians like v-z-r-z can poof the screens
    dfhack.onStateChange[self.onStateChangeKey] = nil
    if self and not self:isDismissed() then self:dismiss() end
        -- does away with non-shown screen, if I have one.
 elseif code == SC_VIEWSCREEN_CHANGED --changed viewscreen
    and self.dismiss_ordered then --this generated screen has been ordered to disappear
    self:dismiss()
    dfhack.onStateChange[self.onStateChangeKey] = nil --clean up global namespace after use
 end
end
dfhack.onStateChange[self.onStateChangeKey] = orderDismissOnScreenChange
end

end

function screen:onResize() self:setRects(textrect, framerect) end


-- initialize display area


-- onRenderBody: has support for either plaintext/number values or function values
-- Note that due getLongestLength each text function will be called once even without showing the screen.
-- since dynamic_text_table is a table, the values in it will change when something else modifies them.
-- could reduce overhead by only checking which ones are functions at start- but then it is not as dynamic.
local emptyKeyTable, onRenderi, cury,curx1,curx2,mousey,mousex,useGeneral  = {}
--Some variables used in onRenderBody left outside to reduce footprint.
local function renderText(dc, dynamic_text, notnewline)
    dc:string(
    (type(dynamic_text.text) == "function") and dynamic_text.text() or dynamic_text.text,
    (type(dynamic_text.color) == "function") and dynamic_text.color() or dynamic_text.color
    )
    if not notnewline then dc:newline() end
end

function screen:onRenderBody(dc)
    --DF sometimes needs a poke to catch up to changes in viewscreen ordering
    if self.focus_path ~= ("indicator_screen/" .. dfhack.gui.getFocusString(self._native.parent)) or
        ("dfhack/lua/" .. self.focus_path ) ~= dfhack.gui.getFocusString(self._native) or --probaby unnecessary
        self.binding_inherit == "hook" and self._native.parent.breakdown_level == 2 then
        --While the logic is generally done in onInput for this infrequent problem, before rendering next frame
        gui.simulateInput(self._native, emptyKeyTable)
        -- the viewscreen doesn't update it's focus path properly without poking it.
    end
    --Rendering section
    if dynamic_text_table.color then dc:pen(dynamic_text_table.color) end
    mousey = df.global.gps.mouse_y
    mousex = df.global.gps.mouse_x
    cury,curx1,curx2, useGeneral = self.frame_body.y1, self.frame_body.x1, self.frame_body.x1,
      (mousey >= self.frame_body.y1 and mousey <= self.frame_body.y2) and
      (mousex >= self.frame_body.x1 and mousex <= self.frame_body.x2) and true or false
  for onRenderi=1, #dynamic_text_table do
    if  (mousey >= self.frame_body.y1 and
    mousey <= self.frame_body.y2) and
    (mousex >= self.frame_body.x1 and
    mousex <= self.frame_body.x2) then
    --A mouse over the frame. Does it do something?
    --First, lets give priority to specific parts of frame.
        curx2 = curx1 -1 + #((type(dynamic_text_table[onRenderi].text) == "function") and
                            dynamic_text_table[onRenderi].text()
                            or dynamic_text_table[onRenderi].text)
        --Determining the dimensions of given dynamic text
        if  mousey == cury and
            (mousex >= curx1 and
            mousex <= curx2) then
            --There's an overlap with text. Commencing hover function and text adding
            --Something of an issue is how it still uses non-rendered text dimensions
            --That can even result in multiple onhovers being called simultaneously.
            --Blinking and such alternatives aren't too good either, so it stays.
            if dynamic_text_table[onRenderi].onhoverfunction and
                type(dynamic_text_table[onRenderi].onhoverfunction) == "function" then
                useGeneral = false
                dynamic_text_table[onRenderi].onhoverfunction()
            end
            if dynamic_text_table[onRenderi].onhovertext and
                type(dynamic_text_table[onRenderi].onhovertext) == "table" then
                curx2 = curx2 +1 - #((type(dynamic_text_table[onRenderi].text) == "function") and
                            dynamic_text_table[onRenderi].text()
                            or dynamic_text_table[onRenderi].text)
                                 + #((type(dynamic_text_table[onRenderi].onhovertext.text) == "function") and
                            dynamic_text_table[onRenderi].onhovertext.text()
                            or dynamic_text_table[onRenderi].onhovertext.text)
                --Got to readjust x if I rendered hovertext
                renderText(dc, dynamic_text_table[onRenderi].onhovertext, dynamic_text_table[onRenderi].notEndOfLine)
                --Using old notEndOfLine for arguably greater convenience.
                --If onhovertext was fully independent text element, it should be different, but it isn't.
            else
                renderText(dc, dynamic_text_table[onRenderi], dynamic_text_table[onRenderi].notEndOfLine)
            end
        else
            renderText(dc, dynamic_text_table[onRenderi], dynamic_text_table[onRenderi].notEndOfLine)
        end
        if not dynamic_text_table[onRenderi].notEndOfLine then cury = cury + 1 end
        if dynamic_text_table[onRenderi].notEndOfLine then curx1 = curx2+1 else curx1 = self.frame_body.x1 end
    else    --Mouse isn't over frame at all, proceed as normal
            renderText(dc, dynamic_text_table[onRenderi], dynamic_text_table[onRenderi].notEndOfLine)
    end
  end
--General hover comes in in case specific ones didn't apply.
--Because it is far easier to apply general anyway after - or before - specific in relevant function,
--than it is to block general from applying.
  if useGeneral and dynamic_text_table.onhoverfunction and
    type(dynamic_text_table.onhoverfunction) == "function" then
      dynamic_text_table.onhoverfunction()
  end

end

local initial_view_child =  df.global.gview.view.child.child
    --Must check current subview before I plant a new subview to see whether it is nil
local localpen = {ch, fg, bg, bold, tile, tile_color, tile_fg, tile_bg}
for i, value in pairs(screen.frame_style) do
localpen[i] = value
end
    --Must not edit a global pen, and doing this right below would do new {} every frame.
    --disadvantage is that must later edit localpen, not self.frame_style
screen.signature_text = "DFHack"
function paint_signature(castx, casty, style, self)
    -- Places dfhack indicator on closest border, either verticall or horizontally
    -- Used when not rendering the rest of frame
    -- signature defines if it is called normally, called with gray on gray or not called for true, nil, false
  if(self.signature == true or self.signature == nil) then
    local MiddleFrame = (not initial_view_child)         -- not nil (== true) if this is first screen.
                        and (isWideView()                 -- In that case, lets check if view is wide,
                            and (df.global.gps.dimx-56) -- and if it is, return it's bar's location,
                            or (isWideView()==false     -- and it isn't, if it is thin
                            and (df.global.gps.dimx-32) -- and therefore thin bar's location
                            or 0))                        -- or perhaps left edge if it isn't thin too.
                        or 0                            -- Tho subordinate screens typically don't have divider.
    --if there's a child frame, there isn't a viewscreen present. Unless it's dfhack viewscreen
    -- Potential todo: Elegant handling several indicator screens in same location.
    -- Currently, it tends to stack the dfhacks on top of each other for multiple indicator screens.
    -- Might be preferable to having several of them, though, so keeping current behaviour
    localpen.fg = self.signature and 16 or 8
    localpen.bg = 8
    local Hcloseness = casty >                         --Is the drawn screen N side
                        (df.global.gps.dimy - casty)-- closer to
                        and df.global.gps.dimy         -- Bottom window border
                        or 0                         -- or Top window border?

    local Vcloseness = (df.global.gps.dimx-castx) <         -- Is the drawn screen W side
                        (castx-MiddleFrame )                 -- closest to
                        and df.global.gps.dimx                 -- Right window border?
                            or ((MiddleFrame - castx) < castx -- Else is it closest to
                            and MiddleFrame                   -- Middle divider
                            or 0 )                              -- or Left window border?
    if math.abs(Vcloseness - castx) < math.abs(Hcloseness-casty) then
    x = Vcloseness
    y = casty
    for index = 1, #screen.signature_text do
    dfhack.screen.paintString(localpen,x,y+index-1,string.sub(screen.signature_text,index,index))
    end
    else
    x = castx
    y = Hcloseness
    dfhack.screen.paintString(localpen,x,y, screen.signature_text)
    end
  end
end

-- Overshadowing gui function, to paint signature for cases of no inset.
-- Though worth noting that that function paints the frame even for inset -1, just behind the text screen usually.

function screen:onRenderFrame(dc, rect)
    local x1,y1,x2,y2 = rect.x1, rect.y1, rect.x2, rect.y2

    if rect.wgap <= 0 and rect.hgap <= 0 then
        dc:clear()
    else
        self:renderParent()
        dc:fill(rect, self.frame_background)
    end
    if self.frame_inset > -1 then gui.paint_frame(x1,y1,x2,y2,self.frame_style,self.frame_title)
    else
    paint_signature(self.frame_body.x1, self.frame_body.y1,self.frame_style, self)
    end
end

-- A dynamic input rectangle could permit adjusting dims as well, but would need constantly rechecking values
-- Alternatively, to change things only as necessay, a function to set them.
-- Asks for if you alter body or frame, then takes upper left corner position and width
-- values not set will be default
-- to adjust only, say, width, you'd use yourscreen:adjustDims(true, nil, nil, newwidth)
-- could create new indicatoror on adjusting those values.
function screen:adjustDims(affectsText,x,y,w,h)
    local targetscreen = affectsText and "frame_body" or "frame_rect"
    local simpleRect = {
        x = x or self[targetscreen].x1,
        y = y or self[targetscreen].y1,
        width = w or self[targetscreen].width,
        height = h or self[targetscreen].height
    }
    set_rect(self[targetscreen],createRect(simpleRect))
end

--If I ever want to remove it from view without, yknow, flickering on dismiss.
--Limited use, as what are you going to do, just leave them all there? Going to create feature-creep eventually
--Maybe use with init setting less_flickering to, say, set timeout to dismiss on every thousandth frame/second
--Alternative solution to flickering: whenever exiting a (vanilla) viewscreen, mask behind its flicker.
--Possibly setting an auto-clean if there's, say, 100 indicator screens already displayed
function screen:removeFromView(dissmiss_when)
    for i,k in pairs(self.frame_rect) do
        self.frame_rect[i] = -10
    end
    for i,k in pairs(self.frame_body) do
        self.frame_body[i] = -10
    end
    self.frame_rect.wgap = 1
    self.dismiss_ordered=true
        --Works with enabled nonblinky dismiss
    self.signature = nil
        --Still subtly visible, but the screen is hidden, so it shouldn't be obvious
    if dismiss_when then
        dfhack.timeout(dismiss_when,"ticks", function () self:dismiss() end)
    end
end

function screen:onHelp()
    --Placeholder function
    --Dismisses self as to not make it impossible to ask for native help while screen is up
    self:dismiss()
end


function screen:onInput(keys)
    -- Basic input reactor
    -- One may subsume this function on customizing, but it already does quite a lot.


        --More of a syntax simplifier function
    local function parentHas(text)
        return(dfhack.gui.getFocusString(self._native.parent):find(text))
    end

    --onclick & onrclick implementation
    if ((keys._MOUSE_L or keys._MOUSE_L_DOWN) or
        (keys._MOUSE_R or keys._MOUSE_R_DOWN)) and
        (df.global.gps.mouse_y >= self.frame_body.y1 and
        df.global.gps.mouse_y <= self.frame_body.y2) and
        (df.global.gps.mouse_x >= self.frame_body.x1 and
        df.global.gps.mouse_x <= self.frame_body.x2) then
        --A click over the frame. Does it do something?
        --First, lets give priority to specific parts of frame.
        cury,curx1,curx2, useGeneral = self.frame_body.y1, self.frame_body.x1, self.frame_body.x1, true
        for i=1, #dynamic_text_table do
            curx2 = curx1 -1 + #((type(dynamic_text_table[i].text) == "function") and
                                dynamic_text_table[i].text()
                                or dynamic_text_table[i].text)
            if df.global.gps.mouse_y == cury and
                (df.global.gps.mouse_x >= curx1 and
                df.global.gps.mouse_x <= curx2) then
                --Single character has y1 == y2, empty string y2<y1
                if (keys._MOUSE_L or keys._MOUSE_L_DOWN) and
                    dynamic_text_table[i].onclick and
                  type(dynamic_text_table[i].onclick) == "function" then
                    --left click
                    useGeneral = false
                    dynamic_text_table[i].onclick()
                elseif (keys._MOUSE_R or keys._MOUSE_R_DOWN) and
                    dynamic_text_table[i].onrclick and
                  type(dynamic_text_table[i].onrclick) == "function" then
                  --right click
                    useGeneral = false
                    dynamic_text_table[i].onrclick()
                end
                break; --onclick or no, no point in looking further when found the overlap.
            end
            if not dynamic_text_table[i].notEndOfLine then cury = cury + 1 end
            if dynamic_text_table[i].notEndOfLine then curx1 = curx2+1 else curx1 = self.frame_body.x1 end
        end
        --General clicks come in in case specific ones didn't apply.
        --Because it is far easier to apply general anyway after - or before - specific in relevant function,
        --than it is to block general from applying.
        if useGeneral and
            (keys._MOUSE_L or keys._MOUSE_L_DOWN) and
            self.onclick and
          type(self.onclick) == "function" then
            self.onclick()
        elseif useGeneral and
            (keys._MOUSE_R or keys._MOUSE_R_DOWN) and
            self.onrclick and
            type(self.onrclick) == "function" then
            self.onrclick()
        end
    end
    -- Menu scrolling fix
    --higher numbers mean multi-stacked indicator screens. I only need to fix cursor once.
    if (parentHas("dwarfmode") == 1 and
        not parentHas("dwarfmode/Build/Material/Groups"))
        and (
            keys.SECONDSCROLL_DOWN or --actually pressed a key I didn't want to change navigation
            keys.SECONDSCROLL_UP or
            keys.SECONDSCROLL_PAGEDOWN or
            keys.SECONDSCROLL_PAGEUP ) then
        if(keys.SECONDSCROLL_DOWN) then
        df.global.cursor.x = df.global.cursor.x+1
        df.global.cursor.y = df.global.cursor.y-1
        end
        if(keys.SECONDSCROLL_UP) then
        df.global.cursor.y = df.global.cursor.y+10

        end
        if(keys.SECONDSCROLL_PAGEDOWN) then
        df.global.cursor.x = df.global.cursor.x -1
        df.global.cursor.y = df.global.cursor.y +1

        end
        if(keys.SECONDSCROLL_PAGEUP) then
        df.global.cursor.x = df.global.cursor.x+10
        end
        --originally had a section here that reset cursor position to within map area...
        --But game does that by itself.
        --TODO: Iirc there were some screens without cursor where the above adjustment resulted
        --  in taking the hidden x -30000 and making it jump there after exiting and using v.


        --Some sections don't move cursor, but affect df.global.window_x,y instead
        local windowx = df.global.window_x
        local windowy = df.global.window_y
        self:sendInputToParent(keys)
        df.global.window_x = windowx
        df.global.window_y = windowy
    else
        self:sendInputToParent(keys)
    end

        --In some cases, screen must be removed for DF hotkey to function
    if parentHas("dwarfmode/Default") and (keys.LEAVESCREEN or    --Can't Escape into savegame menu with screen
       keys.D_ONESTEP or D_PAUSE or --DF doesn't run unpaused when screen is up.
       keys.UNITVIEW_FOLLOW) then --Can't follow unit around either
        self:dismiss()
        --Any replacing of screens onto applicable areas has to be handled by planting a new screen probs.
    end

        --Navigation: Leaving entered menus:
    if keys.LEAVESCREEN and (not parentHas("dwarfmode")) or
        -- Navigation woes: You can't bind Escape nor navigate "down" while screen is up
        -- That mostly means zooming, I think

        -- With z:
        ( (not parentHas("dwarfmode")) and (--Don't want to cancel screen because z-ing an unit or kitchen
            --Since this is "not in dwarfmode", z will cancel the screen even where it'd normally do nothing.

        (--keys.D_HOTKEY_ZOOM  or             --Hotkeys to enable zooming with F1-8 to place
        keys.UNITVIEW_RELATIONSHIPS_ZOOM  or--relationships zoom
        keys.UNITJOB_ZOOM_CRE or            --unitlist, joblist
        keys.ANNOUNCE_ZOOM  or                 --(a)nnouncement list, reports
        keys.STORES_ZOOM  or                 --effect unknown
        keys.A_LOG_ZOOM_SELECTED )             --effect unknown
        or --With b, in unitlist and joblist only:
        (keys.UNITJOB_ZOOM_BUILD and
        (parentHas("unitlist") or
        parentHas("joblist")
        ))
        or --with q and t, in buildinglist only:
        (parentHas("buildinglist") and
        ((keys.BUILDINGLIST_ZOOM_Q)
        or
        (keys.BUILDINGLIST_ZOOM_T)))
        --or OPTION2-20+                    --What are these for?
        ) ) then
        if self.dismiss_on_zoom then
            self:dismiss()
        elseif not dfhack.gui.getFocusString(self._native.parent):find("indicator_screen") then
            --only have to re-place the lowest indicator screen; otherwise others will become lost.
            self._native.parent.breakdown_level = 2
        end
    end
    -- With navigation or hooking, one will carry over bindings intended for grandparent indicator screen.
    -- That can be useful - i.e. going gui/dfstatus then stocks show - but is not intended and can be detrimental
    -- with starting from default and then using v-navigation for instance.
    if self.focus_path ~= ("indicator_screen/" .. dfhack.gui.getFocusString(self._native.parent)) then
        self.focus_path = "indicator_screen/" .. dfhack.gui.getFocusString(self._native.parent)
        self:clearBindings()
        self:inheritBindings()
    end
    if self._native.parent.breakdown_level == 2 and not self:isDismissed() then
        --In case of hooks and zooming, the dismissed screen can be left hanging and screw things up.
        self._native.parent.parent.child = self._native.parent.child
        self._native.parent = self._native.parent.parent
        --Gotta move the screen one upwards.
    end
        -- Script support checks that context of the functions is still apppropriate.
        -- If one dismisses on zoom, would matter only if there's a preexisting screen present
        -- as one enters relevant contexts.
        -- Does rely on the assumption that one uses keyboard or mouse (instead of console) to navigate.
    setOnSelectedUnitJob(self)

end

return screen
end

function placeOnTop(domScreen)
        --Takes a domScreen, and places it on top of currently topmost screen.
  local subScreen = dfhack.gui.getCurViewscreen()
        --Maybe this local variable name might be a little mean...
  domScreen.parent=subScreen
        --It's not the worst possible name, considering.
  subScreen.child=domScreen
end

local args = {...}

if args and args[1] == "help" then print(helptext)
elseif args and args[1] == "execute_hook" then
local execute_helptext = [[
indicator_screen execute_hook
=============================

Utility command for indicator-screen module.
Temporarily removes bottommost scren with indicator_screen focus path,
launchs a command given, then adds the screen back on top after that

Usage format:
  gui/indicator_screen execute_hook <valid command to keybind>

  Intended to be used with keybinding so that the command is executed
  in context below bottommost indicator screen.
]]
if #args == 1 or     --No command given,
   (tostring(args[2]):find("help") and (#(tostring(args[2]))<6)) or --asking for help,
   (tostring(args[2]):find("?") and (#(tostring(args[2]))<3)) then -- or being confused?
   dfhack.print(execute_helptext)            -- Explain!
else
    local gui = require 'gui'

    function getIndicatorScreenChainBase(targetscreen)
        --Finds and returns the screen farthest from parent screen whose focus path includes indicator_screen
        --Not closest to root screen, as that leads to weirdness with screen>unitlist>screen>manipulator
     if targetscreen and --Recursive function may run into nil
        dfhack.gui.getFocusString(targetscreen):find("indicator_screen") and --the topmost is what we want
        not dfhack.gui.getFocusString(targetscreen.parent):find("indicator_screen") --and it's parent is not
        then
        return targetscreen
     elseif targetscreen and targetscreen.parent then --Attempting to call nil.parent will crash this
        return getIndicatorScreenChainBase(targetscreen.parent)
     end
     -- if there's no parent, it didn't find an indicator screen and returns nil
    end

    local lowestIndicatorScreen = getIndicatorScreenChainBase(dfhack.gui.getCurViewscreen())
        --only if we find any indicator screens do we execute the command
    if lowestIndicatorScreen then
        lowestIndicatorScreen.parent.child = nil
        -- Return execution environment to pre-screen context before execution
        dfhack.timeout(1, "frames", function()        -- Wait a bit for dfhack to catch up
            dfhack.run_command(table.concat(args, " ",2)) --Execute command in base environment
                --Needs spaces in-between arguments
            placeOnTop(lowestIndicatorScreen)       --Place the indicator screen back on top.
        end)
    end
end

end