Am 28.07.16 um 04:12 schrieb huey.y.ji...@gmail.com:
On Wednesday, July 27, 2016 at 4:18:29 PM UTC-4, huey.y...@gmail.com wrote:
Hi Folks,
It is common to put a BUTTON on a canvas by the means of coding. However, in my
application, I need to draw a circle on canvas, and then make this circle to
work as if it is a button. When the circle is clicked, it triggers a new image
to be displayed. Somebody can help? Thanks!
The example works. It is smart to bind a button to a widget
Maybe you misunderstood. There is no code which binds a button to a
widget. I assume you talk about Rick's code, which is the most idiomatic
solution:
[...]
canvas.create_oval(10,10,50,50, outline='red', fill='blue',
tags=('button',)
)
canvas.tag_bind('button', '<Button>', cb_canvasButton)
Here, the 'button' is just an arbitrary string to identify this circle.
You could also write:
> canvas.create_oval(10,10,50,50, outline='red', fill='blue',
> tags=('grmmpf',)
> )
> canvas.tag_bind('grmmpf', '<Button>', cb_canvasButton)
and it would work the same. Similarly, "<Button>" is an event which
reacts to any mouse button press. Typically, a button would change it's
shape when pressed and fire the event when released. So in a real app,
you would probably do:
canvas.tag_bind('grmmpf', '<ButtonPress-1>', cb_canvasButtonPress)
canvas.tag_bind('grmmpf', '<ButtonRelease-1>', cb_canvasButtonRelease)
where in the first function you change the color of the button, say
canvas.tag_configure('grmmpf', fill='blue') # untested
and in the second you reset the color and execute the action.
Christian
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