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fixed line numbers in : docs/guide/firstwidget.html (6_button.py)

This commit is contained in:
Jeroen Doggen 2012-12-27 23:39:02 +01:00
parent 7cf8c4952e
commit 36f303868c
1 changed files with 6 additions and 6 deletions
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doc/sources/guide/firstwidget.rst
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@ -286,27 +286,27 @@ Here's what happens:
* Line 4: We added an import statement to be able to use the * Line 4: We added an import statement to be able to use the
:class:`~kivy.uix.button.Button` class. :class:`~kivy.uix.button.Button` class.
* Line 26: We create a dummy ``Widget()`` object as a parent for both * Line 25: We create a dummy ``Widget()`` object as a parent for both
our painting widget and the button we're about to add. This is just our painting widget and the button we're about to add. This is just
a poor-man's approach to setting up a widget tree hierarchy. We a poor-man's approach to setting up a widget tree hierarchy. We
could just as well use a layout or do some other fancy stuff. could just as well use a layout or do some other fancy stuff.
Again: This widget does absolutely nothing except holding the two Again: This widget does absolutely nothing except holding the two
widgets we will now add to it as children. widgets we will now add to it as children.
* Line 27: We create our ``MyPaintWidget()`` as usual, only this time * Line 26: We create our ``MyPaintWidget()`` as usual, only this time
we don't return it directly but bind it to a variable name. we don't return it directly but bind it to a variable name.
* Line 28: We create a button widget. It will have a label on it that * Line 27: We create a button widget. It will have a label on it that
displays the text 'Clear'. displays the text 'Clear'.
* Line 29 & 30: We set up the widget hierarchy by making both the * Line 28 & 29: We set up the widget hierarchy by making both the
painter and the clear button children of the dummy parent widget. painter and the clear button children of the dummy parent widget.
That means painter and button are now siblings in the usual computer That means painter and button are now siblings in the usual computer
science tree terminology. science tree terminology.
* Lines 32 & 33: Up to now, the button did nothing. It was there, * Lines 31 & 32: Up to now, the button did nothing. It was there,
visible, and you could press it, but nothing would happen. visible, and you could press it, but nothing would happen.
We change that here: We create a small throw-away function that is We change that here: We create a small throw-away function that is
going to be our callback function which is called when the button is going to be our callback function which is called when the button is
pressed. The function just clears the painter's canvas' contents, pressed. The function just clears the painter's canvas' contents,
making it black again. making it black again.
* Line 34: We bind the button's on_release event (which is fired when * Line 33: We bind the button's on_release event (which is fired when
the button is pressed and then released) to the callback we just the button is pressed and then released) to the callback we just
defined. defined.