[Tkinter-discuss] Re: How to change font sizes in a Tkinter app

[Martin Franklin]

On Mon, 13 Sep 2004 18:23:05 -0600, <stewart at midtoad.homelinux.org> wrote:

> I posted a question on this topic a few days, and got three interesting,  
> and
> quite varied, approaches to a solution from Jeff Epler, Martin Franklin  
> and
> Michael Lange.  One of the approaches apparently works under Linux, but  
> wouldn't
> work (for me) under Windows, at least not yet.  I had the most success  
> adopting
> Martin's approach, which is contained in modified form in the code  
> sample below.
> Note that my sample app makes use of Pmw, which you can get from
> http://pmw.sf.net.   My app allows the user to change the font face or  
> the font
> colour interactively.  I leave it as an exercise for the reader to be  
> able to
> change the font face as well (e.g. from Helvetica to Roman or Courier).
>
> This list is invaluable for me, because I'm coming across material that  
> seems to
> be absent from any of the information sources I have so far for Tkinter.
>
> thanks again!
>
> cheers
> Stewart
>


Stewart,

I got your code running good work!  However it doesn't update the fonts
of the menu items.

At least not on my Windows machine - Win 2000 Python 2.3.3

For that I had to add some of Jeffs code see below


>
>
>
> ---
> #MenuBarFontApp.py
>
> title = 'FontChange demonstration'
>
> # Import Pmw from this directory tree.
> import sys
> sys.path[:0] = ['../../..']
>
> import Tkinter
> import Pmw
>
> class Demo:
>     def __init__(self, parent):
>
>         self.font=('Helvetica', 10, 'normal')
>        print 'base font is ', self.font
> 	# Create and pack the MenuBar.
> 	menuBar = Pmw.MenuBar(parent,
> 		hull_relief = 'raised',
> 		hull_borderwidth = 1)
> 	menuBar.pack(fill = 'x')
> 	self.menuBar = menuBar
>
> 	# Add some buttons to the MenuBar.
> 	menuBar.addmenu('File', 'Close this window or exit', font=self.font)
> 	menuBar.addmenuitem('File', 'command', 'Close this window',
> 		command = PrintOne('Action: close'),
>         font=self.font,
> 		label = 'Close')
> 	menuBar.addmenuitem('File', 'separator')
> 	menuBar.addmenuitem('File', 'command', 'Exit the application',
> 		command = lambda: sys.exit("Bye"),
>         font=self.font,
> 		label = 'Exit')
>
> 	menuBar.addmenu('Options', 'Set general app options', font=self.font)
>
> 	menuBar.addcascademenu('Options', 'Font Size',
> 		'Change global fonts', traverseSpec = 'z', tearoff = 1, font=self.font)
> 	for size in ('tiny', 'small', 'average', 'big', 'huge', 'monstrous'):
> 	    menuBar.addmenuitem('Font Size', 'command', 'Set size to ' + size,
>                             command = lambda ss=size: WidgetWalker(ss),
>                             font=self.font,
>                             label = size)
>
> 	menuBar.addcascademenu('Options', 'Font Colour',
> 		'Change global fonts', traverseSpec = 'z', tearoff = 1, font=self.font)
> 	for colour in ('black', 'blue', 'red', 'green', 'grey', 'brown'):
> 	    menuBar.addmenuitem('Font Colour', 'command', 'Set size to '  
> + colour,
>                             command = lambda ss=colour:  
> WidgetWalker2(ss),
>                             font=self.font,
>                             label = colour)
>
> 	# Create and pack the main part of the window.
> 	self.mainPart = Tkinter.Label(parent,
> 		text = 'This is the\nmain part of\nthe window',
>         font=self.font,
> 		background = 'white',
> 		foreground = 'black',
> 		padx = 30,
> 		pady = 30)
> 	self.mainPart.pack(fill = 'both', expand = 1)
>
> class PrintOne:
>     def __init__(self, text):
>         self.text = text
>
>     def __call__(self):
>         print self.text
>
> #set font size
> class WidgetWalker:
>     def __init__(self,size):
>         self.parent = root # parent
>         self.size = size
>         newFont = {'tiny': ('Helvetica', 6, 'normal'),
>                     'small': ('Helvetica', 8, 'normal'),
>                     'average': ('Helvetica', 10, 'normal'),
>                     'big': ('Helvetica', 12, 'normal'),
>                     'huge': ('Helvetica', 14, 'normal'),
>                     'monstrous': ('Helvetica', 18, 'normal')}
>         self.newFont = newFont
>         self.walk(self.parent)
>
>     def update(self, widget):
>         try:
>             widget["font"] = self.newFont[self.size]
>         except:
>             pass

## extra try: except: block for menu items
      try:
          # for each menu item try setting the font
          for i in range(widget.index("end") + 1):
              t = widget.type(i)
          if t in ("tearoff", "separator"):
              ## unles it's a tearoff or separator
              continue
          widget.entryconfigure(i, font=self.newFont[self.size])

      except:
          pass



Cheers
Martin



>
>     def walk(self, top):
>         self.update(top)
>         for child in top.children.values():
>             print 'child is ', child
>             self.walk(child)
>
> #set font colour
> class WidgetWalker2:
>     def __init__(self,colour):
>         self.parent = root # parent
>         self.colour = colour
>         self.walk(self.parent)
>
>     def update(self, widget):
>         try:
>             widget["fg"] = self.colour
>         except:
>             pass
>
>     def walk(self, top):
>         self.update(top)
>         for child in top.children.values():
>             print 'child is ', child
>             self.walk(child)
>
>
>
> ######################################################################
>
> # Create demo in root window for testing.
> if __name__ == '__main__':
>     root = Tkinter.Tk()
>     Pmw.initialise(root)
>     root.title(title)
>
>     exitButton = Tkinter.Button(root, text = 'Exit', command =  
> root.destroy)
>     exitButton.pack(side = 'bottom')
>     widget = Demo(root)
>     root.mainloop()



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