Definitions in `TkUtil.hs`

The module TkUtil provides a collection of functions for commonly occurring situations.

menubar :: Window -> [(String,[(String,Cmd ())])] -> Cmd Packable
This function produces a simple menubar from a list of (String,[(String,Cmd ())]) elements. Each such element corresponds to a menu, with a title and a list of entries, where each entry has a text and a callback procedure.
toolbar :: Window -> [(Image,Cmd ())] -> Cmd Packable
This function creates a toolbar from a list of image/callback procedure pairs.
matrix :: Int -> [Packable] -> Packable
This function takes a positive integer (number of columns) and a list of packables as arguments and produces a packable with the individual packables arranged in a matrix. No width correction takes place, so the individual packables must have the correct width.
Radio groups.
```
struct RadioGroup a < WWidget StdOpt, Cell(Maybe a)

radio :: (Show a, Read a) => BasicWindow b -> [([RadioButtonOpt],a)]
          -> [StdOpt] -> Int -> Cmd(RadioGroup a)
```
A radio group is a WWidget StdOpt and also a Cell for values that can be translated to and from Strings. The function radio can be used to create RadioGroup instances. It has four arguments:
1. a window;
2. a list of option/value pairs for all the radiobuttons to be created; the values should be distinct for all buttons (since the Cell method getValue will return the value corresponding to the selected button, if any.
3. A list of StdOpt options for the widget.
4. the number of columns in the rectangular display of radiobuttons within the widget.
addScrollbars :: Window -> ScrollWidget StdOpt -> Cmd (WWidget StdOpt)
A function that adds scrollbars to its second argument. The result is a command, which when executed creates a window widget.
dialog :: Tk -> String -> Maybe PredefBitmap -> String -> [(String,Cmd ())] -> Cmd ()
This functions opens a modal dialog window with a number of buttons associated with commands. When the user selects one of the buttons, the dialog window closes and the corresponding command is executed.
Arguments are
1. A Tk environment (since a window has to be created),
2. a String for the window title,
3. possibly a predefined bitmap to be displayed to the upper left in the dialog.
4. a String to be displayed following the bitmap.
5. a list of button text/callback procedure pairs.
messageDialog :: Tk -> String -> String -> Cmd () -> Cmd ()
A specialized version of dialog, with only one button labelled "OK" and the info bitmap. Arguments are the tk environment, window title, message text andcallback procedure.
dialog2 :: Tk -> String -> String -> String -> (String -> Cmd ()) -> Cmd ()
A modal dialog prompting the user to input a text string. When the user presses Return in the entry or presses "OK", the callback procedure is called with the content of the entry as argument and the window is closed; when the user presses "Cancel", the window is closed without further effect.
Arguments are the Tk environment, window title, message in the window, default text in entry and callback procedure.

Definitions in TkUtil.hs

Definitions in `TkUtil.hs`