def test_mousewheel(self):
sidebar = self.shell.shell_sidebar
text = self.shell.text
# Enter a 100-line string to scroll the shell screen down.
self.do_input('x = """' + '\n'*100 + '"""\n')
yield
self.assertGreater(get_lineno(text, '@0,0'), 1)
last_lineno = get_end_linenumber(text)
self.assertIsNotNone(text.dlineinfo(text.index(f'{last_lineno}.0')))
# Scroll up using the <MouseWheel> event.
# The meaning delta is platform-dependant.
delta = -1 if sys.platform == 'darwin' else 120
sidebar.canvas.event_generate('<MouseWheel>', x=0, y=0, delta=delta)
yield
self.assertIsNone(text.dlineinfo(text.index(f'{last_lineno}.0')))
# Scroll back down using the <Button-5> event.
sidebar.canvas.event_generate('<Button-5>', x=0, y=0)
yield
self.assertIsNotNone(text.dlineinfo(text.index(f'{last_lineno}.0')))
def init_shell(cls):
cls.shell = cls.flist.open_shell()
cls.shell.pollinterval = 10
cls.root.update()
cls.n_preface_lines = get_lineno(cls.shell.text, 'end-1c') - 1