WhileScrolling Trigger

[ichan-mb]

Trigger that will active while the ScrollView is in motion

Example:

<App>
	<ClientPanel>
		<Panel>
			<Rectangle ux:Name="indicator" Color="#838383" CornerRadius="5" Width="8" Height="80" Alignment="TopRight"
				Opacity="0" />
			<ScrollView ux:Name="scrollview">
				<ScrollingAnimation>
					<Move Y="0.95" Target="indicator" RelativeNode="scrollview" RelativeTo="Size" />
				</ScrollingAnimation>
				<WhileScrolling>
					<Change indicator.Opacity="1" Duration="0.1" DelayBack="1" />
				</WhileScrolling>
				<StackPanel ItemSpacing="10">
					<Each Count="100">
						<Panel Height="40" Color="#CDCDCD">
							<Text Value="Item #{index()}" Alignment="VerticalCenter" Margin="10" />
						</Panel>
					</Each>
				</StackPanel>
			</ScrollView>
		</Panel>
	</ClientPanel>
</App>

This PR contains:

• Changelog
• Documentation
• Tests

[mortend]

Just a small typo in the doc-comment. :)

[mortend]

Thank you! :)

[mortend]

• https://travis-ci.org/github/fuse-open/fuselibs/builds/760922837