A smooth login transition

We saw this cool login transition from Anton Aheichanka using the free to-do UI kit from InVision and wanted to recreate it in Fuse.

Note: that this example is made to demonstrate the exact animations as shown in the original animated GIF, and is not focused on creating actual functionality in a login screen or calendar.

The basic structure

This example has two parts; the "to logged in"-animation, and the "to logged out"-animation.

We start by defining the two screens separately and make sure the "logged out" screen is layered underneath the "logged in" screen. This allows for a nicer separation of concerns when animating.

The first animation

We activate the "loading" WhileTrue trigger using a Clicked trigger. The "loading" trigger is in charge of coordinating the different aspects of the animation. It does nothing more than to activate 4 other WhileTrue triggers with the correct timings.

<WhileTrue ux:Name="loading">
    <Change changeWidth.Value="true" DelayBack="0"/>
    <Change loadCircle.Value="true" DelayBack="0"/>

    <Change scaleAndFade.Value="true" Delay="2.5" DelayBack="0"/>
    <Change showLoggedIn.Value="true" Delay="2.9" />
</WhileTrue>

The loading button is composed of a Rectangle with rounded corners. A Circle with a white Stroke is used as the loading indicator. After the loading is complete (in this case just because of a hard coded amount of seconds passing), the loading button is scaled up to fill the screen. This is done by scaling it to the size of an invisible, square Panel that is 5 times the size of the screen's smallest dimension:

<Panel ux:Name="transitionScaleGuide" Width="500%" Height="500%" Alignment="Center" HitTestMode="None" BoxSizing="FillAspect" Aspect="1" />

The animation itself is performed using a Scale animator.

<Scale Target="loadingButton" Factor="3" RelativeTo="SizeFactor" RelativeNode="transitionScaleGuide"
       Delay="0.01" Duration="0.7" Easing="ExponentialInOut" DurationBack="0" />

Because of how scaling works, we actually switch between the normal Rectangle, which defines our loading button, to a scaled down 240x240 Circle just as we are about to scale the button. This is to get rid of any ugly aliasing effects up-scaling the button would cause.

<Panel Row="2" Width="150" Height="60">
    <Text ux:Name="text" Alignment="Center" Value="Sign in" FontSize="18" Color="#fff"/>
    <Panel ux:Name="loadingCirclePanel">
        <Circle ux:Name="loadingCircle" Width="70%" Height="70%" Opacity="0" StartAngleDegrees="0" LengthAngleDegrees="90">
            <Stroke Width="1" Brush="#fff" />
        </Circle>
    </Panel>
    <Clicked>
        <Toggle Target="loading" />
    </Clicked>
    <Rectangle ux:Name="rectNormalScale" CornerRadius="30" Color="#FF3366" Width="300" Height="60"/>
    <Circle ux:Name="loadingButton" Opacity="0" Alignment="Center" Layer="Background" Width="240" Height="240" Color="#FF3366">
        <Scaling Factor="0.25" />
    </Circle>
</Panel>

When the Circle fills the entire screen, we fade in the "loggedInView" Panel, along with a whole bunch of other tiny animations.

<WhileTrue ux:Name="showLoggedIn">
    <Change loggedInView.Opacity="1" Delay="0.1" Duration="0.65" DurationBack="0.35" DelayBack="0.2" Easing="CubicInOut"/>
    <Change plusButton.Opacity="1" Delay="0.1" Duration="0.65" DurationBack="0.7" DelayBack="0.3" Easing="CubicInOut"/>

    <Change goodMorningText.Opacity="1" Duration="0.3" Delay="0.3"/>
    <Change monthPanel.Opacity="1" Duration="0.3" Delay="0.3"/>

    <Change weekTranslation.Y="0" Duration="0.8" Easing="QuadraticInOut"/>
    <Change weekScaling.Factor="1" Duration="0.8" Easing="QuadraticInOut"/>
    <Change headerScaling.Factor="1" Duration="0.6" Easing="CircularInOut" />
    <Change showPlusButton.Value="true" />
    <RaiseUserEvent EventName="ToggleLoggedIn" />

    <Change profile.Opacity="1" Delay="0.7" Duration="0.1" DurationBack="0.2" DelayBack="0"/>
    <Change profileScaling.Factor="1" Delay="0.7" Duration="0.4" Easing="CircularInOut"/>
    <Change loggedInView.IsEnabled="true" />
    <Change plusButton.IsEnabled="true" />
</WhileTrue>

Logging out again

The second animation (going back to the "logged out view") is quite similar to the first one, but we also make sure to deactivate the "loading" WhileTrue trigger, so as to undo the previous animation.

That is it!

Feel free to download and play with the example.