colorchooser.py 1.75 KB
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# tk common colour chooser dialogue
#
# this module provides an interface to the native color dialogue
# available in Tk 4.2 and newer.
#
# written by Fredrik Lundh, May 1997
#
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# fixed initialcolor handling in August 1998
#
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#
# options (all have default values):
#
# - initialcolor: colour to mark as selected when dialog is displayed
#   (given as an RGB triplet or a Tk color string)
#
# - parent: which window to place the dialog on top of
#
# - title: dialog title
#

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from tkinter.commondialog import Dialog
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#
# color chooser class

class Chooser(Dialog):
    "Ask for a color"

    command = "tk_chooseColor"

    def _fixoptions(self):
        try:
            # make sure initialcolor is a tk color string
            color = self.options["initialcolor"]
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            if isinstance(color, tuple):
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                # assume an RGB triplet
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                self.options["initialcolor"] = "#%02x%02x%02x" % color
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        except KeyError:
            pass

    def _fixresult(self, widget, result):
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        # result can be somethings: an empty tuple, an empty string or
        # a Tcl_Obj, so this somewhat weird check handles that
        if not result or not str(result):
            return None, None # canceled

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        # to simplify application code, the color chooser returns
        # an RGB tuple together with the Tk color string
        r, g, b = widget.winfo_rgb(result)
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        return (r/256, g/256, b/256), str(result)
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#
# convenience stuff

def askcolor(color = None, **options):
    "Ask for a color"

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    if color:
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        options = options.copy()
        options["initialcolor"] = color
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    return Chooser(**options).show()
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# --------------------------------------------------------------------
# test stuff

if __name__ == "__main__":
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    print("color", askcolor())