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POHow would you design a very "Pythonic" UI framework?
 

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  1. POHow would you design a very "Pythonic" UI framework?
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    <p>I have been playing with the Ruby library "shoes". Basically you can write a GUI application in the following way:</p> <pre><code>Shoes.app do t = para "Not clicked!" button "The Label" do alert "You clicked the button!" # when clicked, make an alert t.replace "Clicked!" # ..and replace the label's text end end </code></pre> <p>This made me think - how would I design a similarly nice-to-use GUI framework in Python? One that doesn't have the usual tyings of basically being wrappers to a C* library (In the case of GTK, Tk, wx, QT etc etc)</p> <p>Shoes takes things from web devlopment (like <code>#f0c2f0</code> style colour notation, CSS layout techniques, like <code>:margin =&gt; 10</code>), and from ruby (extensively using blocks in sensible ways)</p> <p>Python's lack of "rubyish blocks" makes a (metaphorically)-direct port impossible:</p> <pre><code>def Shoeless(Shoes.app): self.t = para("Not clicked!") def on_click_func(self): alert("You clicked the button!") self.t.replace("clicked!") b = button("The label", click=self.on_click_func) </code></pre> <p>No where near as clean, and wouldn't be <em>nearly</em> as flexible, and I'm not even sure if it would be implementable.</p> <p>Using decorators seems like an interesting way to map blocks of code to a specific action:</p> <pre><code>class BaseControl: def __init__(self): self.func = None def clicked(self, func): self.func = func def __call__(self): if self.func is not None: self.func() class Button(BaseControl): pass class Label(BaseControl): pass # The actual applications code (that the end-user would write) class MyApp: ok = Button() la = Label() @ok.clicked def clickeryHappened(): print "OK Clicked!" if __name__ == '__main__': a = MyApp() a.ok() # trigger the clicked action </code></pre> <p>Basically the decorator function stores the function, then when the action occurred (say, a click) the appropriate function would be executed.</p> <p>The scope of various stuff (say, the <code>la</code> label in the above example) could be rather complicated, but it seems doable in a fairly neat manner..</p>
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    1. COBoth Ruby and Python are suitable for DSL. The difference is in 'L'; it stands for 'languages' for Ruby and 'libraries' for Python. You could force some syntax magic from Python e.g., Django's models, but should you?
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