Slide 38
Slide 38 text
Custom behavior
public class InfoPaneFabBehavior : CoordinatorLayout.Behavior
{
// …
public override bool LayoutDependsOn (CoordinatorLayout parent, Java.Lang.Object child, View dependency)
{
return dependency is InfoPane;
}
public override bool OnDependentViewChanged (CoordinatorLayout parent, Java.Lang.Object child, View dependency)
{
// Move the fab vertically to place correctly wrt the info pane
var fab = child.JavaCast ();
var currentInfoPaneY = ViewCompat.GetTranslationY (dependency);
var newTransY = (int)Math.Max (0, dependency.Height - currentInfoPaneY - minMarginBottom - fab.Height / 2);
ViewCompat.SetTranslationY (fab, -newTransY);
// If alternating between open/closed state, change the FAB face
if (wasOpened ^ ((InfoPane)dependency).Opened) {
fab.Switch ();
wasOpened = !wasOpened;
}
return true;
}
}