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]

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