listThemes

Lists all available GBC themes.

Syntax

ui.Interface.frontCall("theme", "listThemes",
   [], [result])

result - A string containing a JSON array of the available themes. For each theme, the name, title, and conditions are listed. The conditions are contained within a second JSON array.

Usage

The listThemes function returns a JSON array of the themes available to the running application. The array consists of the name, title and conditions of each available theme. For example, the function returns the following when run against the out-of-the-box runtime installation on a desktop machine (line breaks added for readability):

[{"name":"default","title":"Default","conditions":["isDesktop"]},
{"name":"highcontrast","title":"High contrast","conditions":["isDesktop"]}]

Example

main.4gl

IMPORT util

MAIN

  DEFINE themes DYNAMIC ARRAY OF RECORD
    name STRING,
    title STRING
  --  conditions DYNAMIC ARRAY OF STRING
  END RECORD

  DEFINE result string

  OPEN WINDOW w WITH FORM "myform"
  
  CALL ui.Interface.frontcall("theme", "setTheme", ["highcontrast"], [])
  DISPLAY "highcontrast" to formonly.setTheme

  CALL ui.Interface.frontcall("theme", "getCurrentTheme", [], [result])
  DISPLAY result to formonly.getCurrentTheme

  CALL ui.Interface.frontcall("theme", "listThemes", [], [result])
  DISPLAY result to formonly.listThemes
  CALL util.JSON.parse(result, themes)
  DISPLAY ARRAY themes TO themes.*

  MENU
    ON ACTION CANCEL
      EXIT MENU
    ON ACTION CLOSE
      EXIT MENU
  END MENU
END MAIN

myform.per

LAYOUT
GRID
{
setTheme                 [setTheme                  ]
getCurrentTheme          [getCurrentTheme           ]
listThemes               [listThemes                ]

 <T t                                               >
  Name           Title
 [name          |title                              ]
 <                                                  >
}
END
END

ATTRIBUTES
EDIT setTheme = formonly.setTheme;
EDIT getCurrentTheme = formonly.getCurrentTheme;
EDIT listThemes = formonly.listThemes;
name = FORMONLY.name;
title = FORMONLY.title;

INSTRUCTIONS
SCREEN RECORD themes(name, title)