List available fonts

docs/app.md

@@ -79,6 +79,7 @@ You can set and get the following properties:
 | enabled         | boolean               | `True` if the app is enabled                                                               |
 | height          | int                   | The height of the window                                                                   |
 | font            | string                | The font that widgets should use                                                           |
+| fonts           | tuple                 | A sorted tuple of the fonts available for this application                                 |
 | full_screen     | boolean               | False                                                                                      |
 | image           | image_source (string) | The file path, tkinter.PhotoImage or PIL.Image you wish to use as the window icon.         |
 | layout          | string                | The layout being used by the App (`"auto"`) or (`"grid"`)                                  |

examples/pick_font.py

@@ -0,0 +1,17 @@
+from guizero import App, Combo, Text
+
+app = App("Font picker")
+
+Text(app, "Pick a font")
+
+def change_font():
+    app.font = font_picker.value
+
+font_picker = Combo(
+    app, 
+    options=app.fonts, 
+    selected=app.font,
+    command=change_font
+    )
+
+app.display()

guizero/App.py

@@ -1,4 +1,4 @@
-from tkinter import Tk, Toplevel
+from tkinter import Tk, Toplevel, font
 from .base import BaseWindow
 from . import utilities as utils, system_config
 
@@ -87,3 +87,10 @@ def destroy(self):
         if self == App._main_app:
             App._main_app = None
         self.tk.destroy()
+
+    @property
+    def fonts(self):
+        """
+        Returns a tuple of available fonts ('Courier', 'Public Sans', 'Roman')
+        """
+        return sorted(font.families())