TkLua_01 - Display of "Windows System Colors"

"TkLua_01" displays a "list" of system colors as defined by Microsoft Windows (and accessible from within Tk). As an additional feature, upon a click into any of the square color display areas (see figure below) the status line shows the RGB definition of the selected color. To achieve this behaviour the program exploits the possibility to "bind" specific event handling routines to every widget of a Tk user interface.

Despite the program's principal simplicity, it seems convenient to point out the following details:

• using TkLua, widgets whose content is arranged by means of the "geometry manager" "grid" do not support all features offered by Tk. E.g., the attempt to set the "sticky" attribute within the object list just yields an error message;
• the later configuration of certain widgets by means of explicitly issued Tk commands (and the TkLua function "tkeval") will fail unless these widgets have already been "mapped" onto the display - not before then the required "tkname" has been assigned to the corresponding TkLua objects.

"TkLua_01" should be invoked without any command line arguments

  lua TkLua_01.lua

and presents itself as follows:

Screenshot of the TkLua_01 Application Window

Source Code

The source code of this example is available for download:

• TkLua_01.lua (ASCII file, 7162 bytes)

References