Forum: wxRuby Icon questions

9e7e1fa694211d5a1618962734e5cb48?d=identicon&s=25 Roger Sperberg (rsperberg)
on 2010-04-23 18:10
I'm working on my first wxRuby project.

Because the example files are on a different drive, I copied the
wxruby.png icon file to the same directory as my ruby program.

The titlebar icon and Taskbar icon (I'm on a WinXP machine) showed up
fine.

When I substitute an alternate 32x32 .png image, it doesn't:


    # Give the frame an icon. Try an alternate to the default wxruby
icon
    icon_file = File.join( File.dirname(__FILE__)+"/", "slate.png")
#    icon_file = File.join( File.dirname(__FILE__)+"/", "wxruby.png")
    self.icon = Wx::Icon.new(icon_file)

When I open wxruby.png in Photoshop Elements, it seems a normal 32x32
png file with transparency. If I save slate.png in the .ico format,
WinXP does use it, but seems to shrink it to 24x24 or maybe 16x16 or
something smaller in both the toolbar and Taskbar, but shows a very
clear and crisp image in the Task Switcher (alt-Tab), which is clearly
larger than the toolbar icon. (In other words, it looks like the Task
Switcher is using it at 32x32.)

I know that icons in various sizes are needed, and the art folder in the
examples has the wxRuby image in 64x64, 128x128 and 256x256 sizes in
addition to the 32x32 .png. I've also read somewhere that WinXP expects
a 16x16 for the toolbar.

When people say "use .png for the icon" so that it can be used
cross-platform, there seems to be another layer of information I'm
missing. Where can I find out more about what wxRuby or wxWidgets
expects?

Thanks,

Roger Sperberg
rsperberg at gmail
06f6780c99d4a8dd71f2b474082ea9ce?d=identicon&s=25 Alex Fenton (Guest)
on 2010-04-23 22:32
(Received via mailing list)
On 23/04/2010 17:10, Roger Sperberg wrote:
> I know that icons in various sizes are needed, and the art folder in the
> examples has the wxRuby image in 64x64, 128x128 and 256x256 sizes in
> addition to the 32x32 .png. I've also read somewhere that WinXP expects
> a 16x16 for the toolbar.
>
> When people say "use .png for the icon" so that it can be used
> cross-platform, there seems to be another layer of information I'm
> missing. Where can I find out more about what wxRuby or wxWidgets
> expects?
>

In the documentation, though it's nowhere that someone new and asking
the very sensible questions that you ask would find it. The same
question puzzled me for a long time using wxWidgets, until I pretty much
stumbled on (part of) the answer.

Frame inherits it #set_icon (or #icon=) method from Wx::TopLevelWindow.
TLW also has a method #set_icons/#icons= which accepts an object of
class Wx::IconBundle. IB can contain multiple icons at different sizes,
for use in different places.

http://wxruby.rubyforge.org/doc/toplevelwindow.htm...

The next question you might have on icons, since you're trying out on OS
X, is why set_icon(s) doesn't affect an app's Dock icon. This is because
wxWidget's treats the OS X Dock as analogous to the system tray on
Windows, so you use Wx::TaskBarIcon instead. Under Apple's interface
guideliens, the area next to the clock is reserved for system apps - not
user apps.

So the answer to your question is "in several different places". This ml
is happy to help, and I've learnt a vast amount from responses to
wxPython and wxWidgets questions. A search term with class and method
names according to C++ / Python conventions can be fruitful, eg:

http://www.google.co.uk/search?q=wxframe+SetIcon+d...

best
alex
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