R/plotRatio_gui.r

In strvalidator: Process Control and Validation of Forensic STR Kits

################################################################################
# CHANGE LOG (last 20 changes)
# 20.06.2023: Fixed Error in !is.null(val_data) && !is.na(val_data) in coercion to 'logical(1)
# 10.09.2022: Compacted the gui. Fixed narrow dropdowns. Removed destroy workaround.
# 15.05.2020: Fixed spelling error.
# 02.05.2020: Added language support.
# 24.02.2019: Compacted and tweaked gui for tcltk.
# 17.02.2019: Fixed Error in if (svalue(savegui_chk)) { : argument is of length zero (tcltk)
# 13.07.2017: Fixed issue with button handlers.
# 13.07.2017: Fixed narrow dropdown with hidden argument ellipsize = "none".
# 07.07.2017: Replaced 'droplist' with 'gcombobox'.
# 07.07.2017: Removed argument 'border' for 'gbutton'.
# 06.01.2016: Fixed theme methods not found and added more themes.
# 22.12.2015: First version.

#' @title Plot Ratio
#'
#' @description
#' GUI simplifying the creation of plots from marker ratio data.
#'
#' @details Select data to plot in the drop-down menu.
#' Automatic plot titles can be replaced by custom titles.
#' A name for the result is automatically suggested.
#' The resulting plot can be saved as either a plot object or as an image.
#' @param env environment in which to search for data frames.
#' @param savegui logical indicating if GUI settings should be saved in the environment.
#' @param debug logical indicating printing debug information.
#' @param parent widget to get focus when finished.
#'
#' @return TRUE
#'
#' @export
#'
#' @importFrom utils help
#' @importFrom stats as.formula
#' @importFrom ggplot2 ggplot aes_string facet_wrap theme_gray theme_bw
#'  theme_linedraw theme_light theme_dark theme_minimal theme_classic
#'  theme_void
#' @importFrom graphics par
#'
#' @seealso \url{https://ggplot2.tidyverse.org/} for details on plot settings.

plotRatio_gui <- function(env = parent.frame(), savegui = NULL, debug = FALSE, parent = NULL) {
  # Global variables.
  .gData <- NULL
  .gDataName <- NULL
  .gPlot <- NULL
  .scales <- c("free_x", "free_y", "free")
  .theme <- c(
    "theme_grey()", "theme_bw()", "theme_linedraw()",
    "theme_light()", "theme_dark()", "theme_minimal()",
    "theme_classic()", "theme_void()"
  )

  # Language ------------------------------------------------------------------

  # Get this functions name from call.
  fnc <- as.character(match.call()[[1]])

  if (debug) {
    print(paste("IN:", fnc))
  }

  # Default strings.
  strWinTitle <- "Plot marker ratios"
  strChkGui <- "Save GUI settings"
  strBtnHelp <- "Help"
  strFrmDataset <- "Dataset"
  strLblDataset <- "Marker ratio dataset:"
  strDrpDataset <- "<Select dataset>"
  strLblSamples <- "samples"
  strFrmOptions <- "Options"
  strLblScales <- "Scales:"
  strChkOverride <- "Override automatic titles"
  strLblTitlePlot <- "Plot title:"
  strLblTitleX <- "X title:"
  strLblTitleY <- "Y title:"
  strLblTheme <- "Plot theme:"
  strFrmPlot <- "Plot marker ratios"
  strBtnBrowse <- "Browse"
  strTipBrowse <- "Activate the console window and use Enter to step through the plots"
  strBtnPlot <- "Plot"
  strTipPlot <- "Plot all data in one plot, by group if available"
  strBtnProcessing <- "Processing..."
  strFrmSave <- "Save as"
  strLblSave <- "Name for result:"
  strBtnSaveObject <- "Save as object"
  strBtnSaveImage <- "Save as image"
  strBtnObjectSaved <- "Object saved"
  strLblMainTitle <- "Marker ratio"
  strLblYTitle <- "Ratio"
  strLblXTitleMarker <- "Marker"
  strLblXTitlePair <- "Marker pair"
  strMsgNotDf <- "Data set must be a data.frame!"
  strMsgTitleError <- "Error"

  # Get strings from language file.
  dtStrings <- getStrings(gui = fnc)

  # If language file is found.
  if (!is.null(dtStrings)) {
    # Get language strings, use default if not found.

    strtmp <- dtStrings["strWinTitle"]$value
    strWinTitle <- ifelse(is.na(strtmp), strWinTitle, strtmp)

    strtmp <- dtStrings["strChkGui"]$value
    strChkGui <- ifelse(is.na(strtmp), strChkGui, strtmp)

    strtmp <- dtStrings["strBtnHelp"]$value
    strBtnHelp <- ifelse(is.na(strtmp), strBtnHelp, strtmp)

    strtmp <- dtStrings["strFrmDataset"]$value
    strFrmDataset <- ifelse(is.na(strtmp), strFrmDataset, strtmp)

    strtmp <- dtStrings["strLblDataset"]$value
    strLblDataset <- ifelse(is.na(strtmp), strLblDataset, strtmp)

    strtmp <- dtStrings["strDrpDataset"]$value
    strDrpDataset <- ifelse(is.na(strtmp), strDrpDataset, strtmp)

    strtmp <- dtStrings["strLblSamples"]$value
    strLblSamples <- ifelse(is.na(strtmp), strLblSamples, strtmp)

    strtmp <- dtStrings["strFrmOptions"]$value
    strFrmOptions <- ifelse(is.na(strtmp), strFrmOptions, strtmp)

    strtmp <- dtStrings["strLblScales"]$value
    strLblScales <- ifelse(is.na(strtmp), strLblScales, strtmp)

    strtmp <- dtStrings["strChkOverride"]$value
    strChkOverride <- ifelse(is.na(strtmp), strChkOverride, strtmp)

    strtmp <- dtStrings["strLblTitlePlot"]$value
    strLblTitlePlot <- ifelse(is.na(strtmp), strLblTitlePlot, strtmp)

    strtmp <- dtStrings["strLblTitleX"]$value
    strLblTitleX <- ifelse(is.na(strtmp), strLblTitleX, strtmp)

    strtmp <- dtStrings["strLblTitleY"]$value
    strLblTitleY <- ifelse(is.na(strtmp), strLblTitleY, strtmp)

    strtmp <- dtStrings["strLblTheme"]$value
    strLblTheme <- ifelse(is.na(strtmp), strLblTheme, strtmp)

    strtmp <- dtStrings["strFrmPlot"]$value
    strFrmPlot <- ifelse(is.na(strtmp), strFrmPlot, strtmp)

    strtmp <- dtStrings["strBtnBrowse"]$value
    strBtnBrowse <- ifelse(is.na(strtmp), strBtnBrowse, strtmp)

    strtmp <- dtStrings["strTipBrowse"]$value
    strTipBrowse <- ifelse(is.na(strtmp), strTipBrowse, strtmp)

    strtmp <- dtStrings["strBtnPlot"]$value
    strBtnPlot <- ifelse(is.na(strtmp), strBtnPlot, strtmp)

    strtmp <- dtStrings["strTipPlot"]$value
    strTipPlot <- ifelse(is.na(strtmp), strTipPlot, strtmp)

    strtmp <- dtStrings["strBtnProcessing"]$value
    strBtnProcessing <- ifelse(is.na(strtmp), strBtnProcessing, strtmp)

    strtmp <- dtStrings["strFrmSave"]$value
    strFrmSave <- ifelse(is.na(strtmp), strFrmSave, strtmp)

    strtmp <- dtStrings["strLblSave"]$value
    strLblSave <- ifelse(is.na(strtmp), strLblSave, strtmp)

    strtmp <- dtStrings["strBtnSaveObject"]$value
    strBtnSaveObject <- ifelse(is.na(strtmp), strBtnSaveObject, strtmp)

    strtmp <- dtStrings["strBtnSaveImage"]$value
    strBtnSaveImage <- ifelse(is.na(strtmp), strBtnSaveImage, strtmp)

    strtmp <- dtStrings["strBtnObjectSaved"]$value
    strBtnObjectSaved <- ifelse(is.na(strtmp), strBtnObjectSaved, strtmp)

    strtmp <- dtStrings["strLblMainTitle"]$value
    strLblMainTitle <- ifelse(is.na(strtmp), strLblMainTitle, strtmp)

    strtmp <- dtStrings["strLblYTitle"]$value
    strLblYTitle <- ifelse(is.na(strtmp), strLblYTitle, strtmp)

    strtmp <- dtStrings["strLblXTitleMarker"]$value
    strLblXTitleMarker <- ifelse(is.na(strtmp), strLblXTitleMarker, strtmp)

    strtmp <- dtStrings["strLblXTitlePair"]$value
    strLblXTitlePair <- ifelse(is.na(strtmp), strLblXTitlePair, strtmp)

    strtmp <- dtStrings["strMsgNotDf"]$value
    strMsgNotDf <- ifelse(is.na(strtmp), strMsgNotDf, strtmp)

    strtmp <- dtStrings["strMsgTitleError"]$value
    strMsgTitleError <- ifelse(is.na(strtmp), strMsgTitleError, strtmp)
  }

  # WINDOW ####################################################################

  # Main window.
  w <- gwindow(title = strWinTitle, visible = FALSE)

  # Runs when window is closed.
  addHandlerUnrealize(w, handler = function(h, ...) {
    # Save GUI state.
    .saveSettings()

    # Focus on parent window.
    if (!is.null(parent)) {
      focus(parent)
    }

    # Destroy window.
    return(FALSE)
  })

  # Vertical main group.
  gv <- ggroup(
    horizontal = FALSE,
    spacing = 1,
    use.scrollwindow = FALSE,
    container = w,
    expand = TRUE
  )

  # Help button group.
  gh <- ggroup(container = gv, expand = FALSE, fill = "both")

  savegui_chk <- gcheckbox(text = strChkGui, checked = FALSE, container = gh)

  addSpring(gh)

  help_btn <- gbutton(text = strBtnHelp, container = gh)

  addHandlerChanged(help_btn, handler = function(h, ...) {
    # Open help page for function.
    print(help(fnc, help_type = "html"))
  })

  # FRAME 0 ###################################################################

  f0 <- gframe(
    text = strFrmDataset,
    horizontal = TRUE,
    spacing = 1,
    container = gv
  )

  glabel(text = strLblDataset, container = f0)

  samples_lbl <- glabel(
    text = paste(" 0 ", strLblSamples, sep = ""),
    container = f0
  )

  dataset_drp <- gcombobox(
    items = c(
      strDrpDataset,
      listObjects(
        env = env,
        obj.class = "data.frame"
      )
    ),
    selected = 1,
    editable = FALSE,
    container = f0,
    ellipsize = "none",
    expand = TRUE,
    fill = "x"
  )

  addHandlerChanged(dataset_drp, handler = function(h, ...) {
    val_obj <- svalue(dataset_drp)

    # Check if suitable.
    requiredCol <- c("Sample.Name")
    ok <- checkDataset(
      name = val_obj, reqcol = requiredCol,
      env = env, parent = w, debug = debug
    )

    if (ok) {
      # Load or change components.

      # Get data.
      .gData <<- get(val_obj, envir = env)

      # Suggest name.
      svalue(f5_save_edt) <- paste(val_obj, "_ggplot", sep = "")

      svalue(samples_lbl) <- paste(" ",
        length(unique(.gData$Sample.Name)),
        " ", strLblSamples,
        sep = ""
      )

      # Enable buttons.
      enabled(plot_browse_btn) <- TRUE
      enabled(plot_all_btn) <- TRUE
    } else {
      # Reset components.
      .gData <<- NULL
      svalue(f5_save_edt) <- ""
      svalue(dataset_drp, index = TRUE) <- 1
      svalue(samples_lbl) <- paste(" 0 ", strLblSamples, sep = "")
    }
  })

  # FRAME 1 ###################################################################

  f1 <- gframe(
    text = strFrmOptions,
    horizontal = FALSE,
    spacing = 1,
    container = gv
  )

  glabel(text = strLblScales, container = f1)
  f1_scales_opt <- gradio(
    items = .scales,
    selected = 1, container = f1
  )

  titles_chk <- gcheckbox(
    text = strChkOverride,
    checked = FALSE, container = f1
  )


  addHandlerChanged(titles_chk, handler = function(h, ...) {
    .updateGui()
  })

  titles_group <- ggroup(
    container = f1, spacing = 1, horizontal = FALSE,
    expand = TRUE, fill = TRUE
  )

  # Legends
  glabel(text = strLblTitlePlot, container = titles_group, anchor = c(-1, 0))
  title_edt <- gedit(expand = TRUE, fill = TRUE, container = titles_group)

  glabel(text = strLblTitleX, container = titles_group, anchor = c(-1, 0))
  x_title_edt <- gedit(expand = TRUE, fill = TRUE, container = titles_group)

  glabel(text = strLblTitleY, container = titles_group, anchor = c(-1, 0))
  y_title_edt <- gedit(expand = TRUE, fill = TRUE, container = titles_group)


  f1g2 <- glayout(container = f1)
  f1g2[1, 1] <- glabel(text = strLblTheme, anchor = c(-1, 0), container = f1g2)
  f1g2[1, 2] <- f1_theme_drp <- gcombobox(
    items = .theme,
    selected = 1,
    container = f1g2,
    ellipsize = "none"
  )

  # FRAME 7 ###################################################################

  f7 <- gframe(
    text = strFrmPlot,
    horizontal = TRUE,
    container = gv
  )

  plot_browse_btn <- gbutton(text = strBtnBrowse, container = f7)
  tooltip(plot_browse_btn) <- strTipBrowse

  plot_all_btn <- gbutton(text = strBtnPlot, container = f7)
  tooltip(plot_all_btn) <- strTipPlot

  addHandlerChanged(plot_browse_btn, handler = function(h, ...) {
    enabled(plot_browse_btn) <- FALSE
    .plot(what = "browse")
    enabled(plot_browse_btn) <- TRUE
  })

  addHandlerChanged(plot_all_btn, handler = function(h, ...) {
    enabled(plot_all_btn) <- FALSE
    .plot(what = "plot")
    enabled(plot_all_btn) <- TRUE
  })

  # FRAME 5 ###################################################################

  f5 <- gframe(
    text = strFrmSave,
    horizontal = TRUE,
    spacing = 1,
    container = gv
  )

  glabel(text = strLblSave, container = f5)

  f5_save_edt <- gedit(expand = TRUE, fill = TRUE, container = f5)

  f5_save_btn <- gbutton(text = strBtnSaveObject, container = f5)

  f5_ggsave_btn <- gbutton(text = strBtnSaveImage, container = f5)

  addHandlerClicked(f5_save_btn, handler = function(h, ...) {
    val_name <- svalue(f5_save_edt)

    # Change button.
    blockHandlers(f5_save_btn)
    svalue(f5_save_btn) <- strBtnProcessing
    unblockHandlers(f5_save_btn)
    enabled(f5_save_btn) <- FALSE

    # Save data.
    saveObject(
      name = val_name, object = .gPlot,
      parent = w, env = env, debug = debug
    )

    # Change button.
    blockHandlers(f5_save_btn)
    svalue(f5_save_btn) <- strBtnObjectSaved
    unblockHandlers(f5_save_btn)
  })

  addHandlerChanged(f5_ggsave_btn, handler = function(h, ...) {
    val_name <- svalue(f5_save_edt)

    # Save data.
    ggsave_gui(
      ggplot = .gPlot, name = val_name,
      parent = w, env = env, savegui = savegui, debug = debug
    )
  })

  # FUNCTIONS #################################################################


  .plot <- function(what) {
    # Get values.
    val_data <- .gData
    val_scales <- svalue(f1_scales_opt)
    val_titles <- svalue(titles_chk)
    val_title <- svalue(title_edt)
    val_xtitle <- svalue(x_title_edt)
    val_ytitle <- svalue(y_title_edt)
    val_theme <- svalue(f1_theme_drp)

    if (is.data.frame(val_data)) {
      # Fix data for plotting.
      vecColNames <- setdiff(names(val_data), c("Sample.Name", "Group"))

      # Expand vectors.
      intSamples <- length(val_data$Sample.Name)
      intColumns <- length(vecColNames)
      vecSampleName <- rep(val_data$Sample.Name, intColumns)
      vecGroup <- rep(val_data$Group, intColumns)

      # Create new data.frame for plotting.
      if (is.null(vecGroup)) {
        dfPlot <- data.frame(Sample.Name = vecSampleName)
      } else {
        dfPlot <- data.frame(Sample.Name = vecSampleName, Group = vecGroup)
      }

      # Initialise variables.
      vecMarkers <- NULL
      vecRatio <- NULL

      # Loop over all column names containing ratios.
      for (i in seq(along = vecColNames)) {
        # Add column data to vector.
        vecRatio <- c(vecRatio, val_data[, vecColNames[i]])
        vecMarkers <- c(vecMarkers, rep(vecColNames[i], intSamples))
      }

      # Add info.
      dfPlot$Ratio <- vecRatio
      dfPlot$Marker <- vecMarkers

      # Plotting alleles for observed stutters per marker.
      if (what == "browse") {
        # Enable confirm. NB! Remember to disable.
        par(ask = T)

        # Loop through and plot individually.
        for (i in seq(along = vecColNames)) {
          if ("Group" %in% names(val_data)) {
            gp <- ggplot(subset(dfPlot, Marker == vecColNames[i]))
            gp <- gp + geom_boxplot(aes_string(x = "Group", y = "Ratio"))

            if (val_titles) {
              gp <- .applyPlotSettings(
                gp = gp, theme = val_theme, main.title = val_title,
                x.title = val_xtitle, y.title = val_ytitle
              )
            } else {
              gp <- .applyPlotSettings(
                gp = gp, theme = val_theme, main.title = strLblMainTitle,
                x.title = vecColNames[i], y.title = strLblYTitle
              )
            }
          } else {
            gp <- ggplot(subset(dfPlot, Marker == vecColNames[i]))
            gp <- gp + geom_boxplot(aes_string(x = "Marker", y = "Ratio"))

            if (val_titles) {
              gp <- .applyPlotSettings(
                gp = gp, theme = val_theme, main.title = val_title,
                x.title = val_xtitle, y.title = val_ytitle
              )
            } else {
              gp <- .applyPlotSettings(
                gp = gp, theme = val_theme, main.title = strLblMainTitle,
                x.title = strLblXTitleMarker, y.title = strLblYTitle
              )
            }
          }

          # Show plot.
          print(gp)

          # Store in global variable.
          .gPlot <<- gp
        }

        # Disable confirm.
        par(ask = F)
      } else if (what == "plot") {
        if ("Group" %in% names(val_data)) {
          # Create plot.
          gp <- ggplot(
            data = dfPlot,
            aes_string(x = "Group", y = "Ratio", fill = "Group")
          )
          gp <- gp + geom_boxplot()
          gp <- gp + facet_wrap(as.formula(paste("~ Marker")), scales = val_scales)

          if (val_titles) {
            gp <- .applyPlotSettings(
              gp = gp, theme = val_theme, main.title = val_title,
              x.title = val_xtitle, y.title = val_ytitle
            )
          } else {
            gp <- .applyPlotSettings(
              gp = gp, theme = val_theme, main.title = strLblMainTitle,
              x.title = NULL, y.title = strLblYTitle
            )
          }
        } else {
          # Create plot.
          gp <- ggplot(
            data = dfPlot,
            aes_string(x = "Marker", y = "Ratio")
          )
          gp <- gp + geom_boxplot()
          gp <- gp + facet_wrap(as.formula(paste("~ Marker")), scales = val_scales)

          if (val_titles) {
            gp <- .applyPlotSettings(
              gp = gp, theme = val_theme, main.title = val_title,
              x.title = val_xtitle, y.title = val_ytitle
            )
          } else {
            gp <- .applyPlotSettings(
              gp = gp, theme = val_theme, main.title = strLblMainTitle,
              x.title = strLblXTitlePair, y.title = strLblYTitle
            )
          }
        }

        # Show plot.
        print(gp)

        # Store in global variable.
        .gPlot <<- gp
      }

      # Change save button.
      svalue(f5_save_btn) <- strBtnSaveObject
      enabled(f5_save_btn) <- TRUE
    } else {
      gmessage(
        msg = strMsgNotDf,
        title = strMsgTitleError,
        icon = "error"
      )
    }
  }

  # INTERNAL FUNCTIONS ########################################################

  .updateGui <- function() {
    # Override titles.
    val <- svalue(titles_chk)
    if (val) {
      enabled(titles_group) <- TRUE
    } else {
      enabled(titles_group) <- FALSE
    }
  }

  .applyPlotSettings <- function(gp, theme = "theme_grey()",
                                 main.title = NULL, x.title = NULL, y.title = NULL) {
    # Apply theme.
    gp <- gp + eval(parse(text = theme))

    # Apply titles.
    gp <- gp + labs(title = main.title)
    gp <- gp + xlab(x.title)
    gp <- gp + ylab(y.title)

    return(gp)
  }

  .loadSavedSettings <- function() {
    # First check status of save flag.
    if (!is.null(savegui)) {
      svalue(savegui_chk) <- savegui
      enabled(savegui_chk) <- FALSE
      if (debug) {
        print("Save GUI status set!")
      }
    } else {
      # Load save flag.
      if (exists(".strvalidator_plotRatio_gui_savegui", envir = env, inherits = FALSE)) {
        svalue(savegui_chk) <- get(".strvalidator_plotRatio_gui_savegui", envir = env)
      }
      if (debug) {
        print("Save GUI status loaded!")
      }
    }
    if (debug) {
      print(svalue(savegui_chk))
    }

    # Then load settings if true.
    if (svalue(savegui_chk)) {
      if (exists(".strvalidator_plotRatio_gui_title", envir = env, inherits = FALSE)) {
        svalue(title_edt) <- get(".strvalidator_plotRatio_gui_title", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_scales", envir = env, inherits = FALSE)) {
        svalue(f1_scales_opt) <- get(".strvalidator_plotRatio_gui_scales", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_title_chk", envir = env, inherits = FALSE)) {
        svalue(titles_chk) <- get(".strvalidator_plotRatio_gui_title_chk", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_x_title", envir = env, inherits = FALSE)) {
        svalue(x_title_edt) <- get(".strvalidator_plotRatio_gui_x_title", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_y_title", envir = env, inherits = FALSE)) {
        svalue(y_title_edt) <- get(".strvalidator_plotRatio_gui_y_title", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_theme", envir = env, inherits = FALSE)) {
        svalue(f1_theme_drp) <- get(".strvalidator_plotRatio_gui_theme", envir = env)
      }

      if (debug) {
        print("Saved settings loaded!")
      }
    }
  }

  .saveSettings <- function() {
    # Then save settings if true.
    if (svalue(savegui_chk)) {
      assign(x = ".strvalidator_plotRatio_gui_savegui", value = svalue(savegui_chk), envir = env)
      assign(x = ".strvalidator_plotRatio_gui_scales", value = svalue(f1_scales_opt), envir = env)
      assign(x = ".strvalidator_plotRatio_gui_title", value = svalue(title_edt), envir = env)
      assign(x = ".strvalidator_plotRatio_gui_title_chk", value = svalue(titles_chk), envir = env)
      assign(x = ".strvalidator_plotRatio_gui_x_title", value = svalue(x_title_edt), envir = env)
      assign(x = ".strvalidator_plotRatio_gui_y_title", value = svalue(y_title_edt), envir = env)
      assign(x = ".strvalidator_plotRatio_gui_theme", value = svalue(f1_theme_drp), envir = env)
    } else { # or remove all saved values if false.

      if (exists(".strvalidator_plotRatio_gui_savegui", envir = env, inherits = FALSE)) {
        remove(".strvalidator_plotRatio_gui_savegui", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_scales", envir = env, inherits = FALSE)) {
        remove(".strvalidator_plotRatio_gui_scales", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_title", envir = env, inherits = FALSE)) {
        remove(".strvalidator_plotRatio_gui_title", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_title_chk", envir = env, inherits = FALSE)) {
        remove(".strvalidator_plotRatio_gui_title_chk", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_x_title", envir = env, inherits = FALSE)) {
        remove(".strvalidator_plotRatio_gui_x_title", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_y_title", envir = env, inherits = FALSE)) {
        remove(".strvalidator_plotRatio_gui_y_title", envir = env)
      }
      if (exists(".strvalidator_plotRatio_gui_theme", envir = env, inherits = FALSE)) {
        remove(".strvalidator_plotRatio_gui_theme", envir = env)
      }

      if (debug) {
        print("Settings cleared!")
      }
    }

    if (debug) {
      print("Settings saved!")
    }
  }

  # END GUI ###################################################################

  # Load GUI settings.
  .loadSavedSettings()
  .updateGui()

  # Show GUI.
  visible(w) <- TRUE
  focus(w)
}