Gonzalo Odiard 5626a6c182 Detect scrolling in treviews and optimize drawing ...

Detecting if the treeview is scrolling we can improve the performance of
the CellRendererIcon by avoiding unneeded calculations.

The example scrollingdetector.py shows how this can be used.  The
changes are backward compatible.

Signed-off-by: Manuel Quiñones <manuel.por.aca@gmail.com>
Signed-off-by: Gonzalo Odiard <godiard@sugarlabs.org>

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alert.py

pep8'd examples

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animator.py

pep8'd examples

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buttons.py

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cellrenderericon.py

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combobox.py

pep8'd examples

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common.py

pep8'd examples

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customdestroy.py

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gtktreesensitive.py

Add a make target for tests

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iconbadges.py

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iconcache.py

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iconentry.py

pep8'd examples

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iconwidget.py

Fixes for pep8 1.5

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intro.py

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notebook.py

pep8'd examples

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progress.py

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radiopalette.py

pep8'd examples

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scrollingdetector.py

Detect scrolling in treviews and optimize drawing

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tabs.py

pep8'd examples

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ticket2855.py

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ticket2999.py

Add a make target for tests

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ticket3000.py

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toolbar.py

pep8'd examples

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toolbarpalettes.py

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toolbuttons.py

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tray.py

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